gl_backend.c

   1
   2 #include "quakedef.h"
   3 #include "cl_collision.h"
   4
   5 cvar_t gl_mesh_drawrangeelements = {0, "gl_mesh_drawrangeelements", "1", "use glDrawRangeElements function if available instead of glDrawElements (for performance comparisons or bug testing)"};
   6 cvar_t gl_mesh_testarrayelement = {0, "gl_mesh_testarrayelement", "0", "use glBegin(GL_TRIANGLES);glArrayElement();glEnd(); primitives instead of glDrawElements (useful to test for driver bugs with glDrawElements)"};
   7 cvar_t gl_mesh_testmanualfeeding = {0, "gl_mesh_testmanualfeeding", "0", "use glBegin(GL_TRIANGLES);glTexCoord2f();glVertex3f();glEnd(); primitives instead of glDrawElements (useful to test for driver bugs with glDrawElements)"};
   8 cvar_t gl_mesh_prefer_short_elements = {0, "gl_mesh_prefer_short_elements", "1", "use GL_UNSIGNED_SHORT element arrays instead of GL_UNSIGNED_INT"};
   9 cvar_t gl_paranoid = {0, "gl_paranoid", "0", "enables OpenGL error checking and other tests"};
  10 cvar_t gl_printcheckerror = {0, "gl_printcheckerror", "0", "prints all OpenGL error checks, useful to identify location of driver crashes"};
  11
  12 cvar_t r_render = {0, "r_render", "1", "enables rendering 3D views (you want this on!)"};
  13 cvar_t r_renderview = {0, "r_renderview", "1", "enables rendering 3D views (you want this on!)"};
  14 cvar_t r_waterwarp = {CVAR_SAVE, "r_waterwarp", "1", "warp view while underwater"};
  15 cvar_t gl_polyblend = {CVAR_SAVE, "gl_polyblend", "1", "tints view while underwater, hurt, etc"};
  16 cvar_t gl_dither = {CVAR_SAVE, "gl_dither", "1", "enables OpenGL dithering (16bit looks bad with this off)"};
  17 cvar_t gl_vbo = {CVAR_SAVE, "gl_vbo", "3", "make use of GL_ARB_vertex_buffer_object extension to store static geometry in video memory for faster rendering, 0 disables VBO allocation or use, 1 enables VBOs for vertex and triangle data, 2 only for vertex data, 3 for vertex data and triangle data of simple meshes (ones with only one surface)"};
  18 cvar_t gl_fbo = {CVAR_SAVE, "gl_fbo", "1", "make use of GL_ARB_framebuffer_object extension to enable shadowmaps and other features using pixel formats different from the framebuffer"};
  19
  20 cvar_t v_flipped = {0, "v_flipped", "0", "mirror the screen (poor man's left handed mode)"};
  21 qboolean v_flipped_state = false;
  22
  23 r_viewport_t gl_viewport;
  24 matrix4x4_t gl_modelmatrix;
  25 matrix4x4_t gl_viewmatrix;
  26 matrix4x4_t gl_modelviewmatrix;
  27 matrix4x4_t gl_projectionmatrix;
  28 matrix4x4_t gl_modelviewprojectionmatrix;
  29 float gl_modelview16f[16];
  30 float gl_modelviewprojection16f[16];
  31 qboolean gl_modelmatrixchanged;
  32
  33 int gl_maxdrawrangeelementsvertices;
  34 int gl_maxdrawrangeelementsindices;
  35
  36 #ifdef DEBUGGL
  37 int errornumber = 0;
  38
  39 void GL_PrintError(int errornumber, char *filename, int linenumber)
  40 {
  41         switch(errornumber)
  42         {
  43 #ifdef GL_INVALID_ENUM
  44         case GL_INVALID_ENUM:
  45                 Con_Printf("GL_INVALID_ENUM at %s:%i\n", filename, linenumber);
  46                 break;
  47 #endif
  48 #ifdef GL_INVALID_VALUE
  49         case GL_INVALID_VALUE:
  50                 Con_Printf("GL_INVALID_VALUE at %s:%i\n", filename, linenumber);
  51                 break;
  52 #endif
  53 #ifdef GL_INVALID_OPERATION
  54         case GL_INVALID_OPERATION:
  55                 Con_Printf("GL_INVALID_OPERATION at %s:%i\n", filename, linenumber);
  56                 break;
  57 #endif
  58 #ifdef GL_STACK_OVERFLOW
  59         case GL_STACK_OVERFLOW:
  60                 Con_Printf("GL_STACK_OVERFLOW at %s:%i\n", filename, linenumber);
  61                 break;
  62 #endif
  63 #ifdef GL_STACK_UNDERFLOW
  64         case GL_STACK_UNDERFLOW:
  65                 Con_Printf("GL_STACK_UNDERFLOW at %s:%i\n", filename, linenumber);
  66                 break;
  67 #endif
  68 #ifdef GL_OUT_OF_MEMORY
  69         case GL_OUT_OF_MEMORY:
  70                 Con_Printf("GL_OUT_OF_MEMORY at %s:%i\n", filename, linenumber);
  71                 break;
  72 #endif
  73 #ifdef GL_TABLE_TOO_LARGE
  74         case GL_TABLE_TOO_LARGE:
  75                 Con_Printf("GL_TABLE_TOO_LARGE at %s:%i\n", filename, linenumber);
  76                 break;
  77 #endif
  78 #ifdef GL_INVALID_FRAMEBUFFER_OPERATION_EXT
  79         case GL_INVALID_FRAMEBUFFER_OPERATION_EXT:
  80                 Con_Printf("GL_INVALID_FRAMEBUFFER_OPERATION at %s:%i\n", filename, linenumber);
  81                 break;
  82 #endif
  83         default:
  84                 Con_Printf("GL UNKNOWN (%i) at %s:%i\n", errornumber, filename, linenumber);
  85                 break;
  86         }
  87 }
  88 #endif
  89
  90 #define BACKENDACTIVECHECK if (!gl_state.active) Sys_Error("GL backend function called when backend is not active");
  91
  92 void SCR_ScreenShot_f (void);
  93
  94 typedef struct gl_bufferobjectinfo_s
  95 {
  96         int target;
  97         int object;
  98         size_t size;
  99         char name[MAX_QPATH];
 100 }
 101 gl_bufferobjectinfo_t;
 102
 103 typedef struct gltextureunit_s
 104 {
 105         const void *pointer_texcoord;
 106         size_t pointer_texcoord_offset;
 107         int pointer_texcoord_buffer;
 108         int t2d, t3d, tcubemap, trectangle;
 109         int arrayenabled;
 110         unsigned int arraycomponents;
 111         int rgbscale, alphascale;
 112         int combine;
 113         int combinergb, combinealpha;
 114         // texmatrixenabled exists only to avoid unnecessary texmatrix compares
 115         int texmatrixenabled;
 116         matrix4x4_t matrix;
 117 }
 118 gltextureunit_t;
 119
 120 typedef struct gl_state_s
 121 {
 122         int cullface;
 123         int cullfaceenable;
 124         int blendfunc1;
 125         int blendfunc2;
 126         int blend;
 127         GLboolean depthmask;
 128         int colormask; // stored as bottom 4 bits: r g b a (3 2 1 0 order)
 129         int depthtest;
 130         float depthrange[2];
 131         float polygonoffset[2];
 132         int alphatest;
 133         int scissortest;
 134         unsigned int unit;
 135         unsigned int clientunit;
 136         gltextureunit_t units[MAX_TEXTUREUNITS];
 137         float color4f[4];
 138         int lockrange_first;
 139         int lockrange_count;
 140         int vertexbufferobject;
 141         int elementbufferobject;
 142         qboolean pointer_color_enabled;
 143         const void *pointer_vertex;
 144         const void *pointer_color;
 145         size_t pointer_vertex_offset;
 146         size_t pointer_color_offset;
 147         int pointer_vertex_buffer;
 148         int pointer_color_buffer;
 149
 150         memexpandablearray_t bufferobjectinfoarray;
 151
 152         qboolean active;
 153 }
 154 gl_state_t;
 155
 156 static gl_state_t gl_state;
 157
 158
 159 /*
 160 note: here's strip order for a terrain row:
 161 0--1--2--3--4
 162 |\ |\ |\ |\ |
 163 | \| \| \| \|
 164 A--B--C--D--E
 165 clockwise
 166
 167 A0B, 01B, B1C, 12C, C2D, 23D, D3E, 34E
 168
 169 *elements++ = i + row;
 170 *elements++ = i;
 171 *elements++ = i + row + 1;
 172 *elements++ = i;
 173 *elements++ = i + 1;
 174 *elements++ = i + row + 1;
 175
 176
 177 for (y = 0;y < rows - 1;y++)
 178 {
 179         for (x = 0;x < columns - 1;x++)
 180         {
 181                 i = y * rows + x;
 182                 *elements++ = i + columns;
 183                 *elements++ = i;
 184                 *elements++ = i + columns + 1;
 185                 *elements++ = i;
 186                 *elements++ = i + 1;
 187                 *elements++ = i + columns + 1;
 188         }
 189 }
 190
 191 alternative:
 192 0--1--2--3--4
 193 | /| /|\ | /|
 194 |/ |/ | \|/ |
 195 A--B--C--D--E
 196 counterclockwise
 197
 198 for (y = 0;y < rows - 1;y++)
 199 {
 200         for (x = 0;x < columns - 1;x++)
 201         {
 202                 i = y * rows + x;
 203                 *elements++ = i;
 204                 *elements++ = i + columns;
 205                 *elements++ = i + columns + 1;
 206                 *elements++ = i + columns;
 207                 *elements++ = i + columns + 1;
 208                 *elements++ = i + 1;
 209         }
 210 }
 211 */
 212
 213 int polygonelement3i[(POLYGONELEMENTS_MAXPOINTS-2)*3];
 214 unsigned short polygonelement3s[(POLYGONELEMENTS_MAXPOINTS-2)*3];
 215 int quadelement3i[QUADELEMENTS_MAXQUADS*6];
 216 unsigned short quadelement3s[QUADELEMENTS_MAXQUADS*6];
 217
 218 void GL_VBOStats_f(void)
 219 {
 220         GL_Mesh_ListVBOs(true);
 221 }
 222
 223 static void GL_Backend_ResetState(void);
 224
 225 static void gl_backend_start(void)
 226 {
 227         memset(&gl_state, 0, sizeof(gl_state));
 228
 229         Mem_ExpandableArray_NewArray(&gl_state.bufferobjectinfoarray, r_main_mempool, sizeof(gl_bufferobjectinfo_t), 128);
 230
 231         Con_DPrintf("OpenGL backend started.\n");
 232
 233         CHECKGLERROR
 234
 235         GL_Backend_ResetState();
 236 }
 237
 238 static void gl_backend_shutdown(void)
 239 {
 240         Con_DPrint("OpenGL Backend shutting down\n");
 241
 242         Mem_ExpandableArray_FreeArray(&gl_state.bufferobjectinfoarray);
 243
 244         memset(&gl_state, 0, sizeof(gl_state));
 245 }
 246
 247 static void gl_backend_newmap(void)
 248 {
 249 }
 250
 251 void gl_backend_init(void)
 252 {
 253         int i;
 254
 255         for (i = 0;i < POLYGONELEMENTS_MAXPOINTS - 2;i++)
 256         {
 257                 polygonelement3s[i * 3 + 0] = 0;
 258                 polygonelement3s[i * 3 + 1] = i + 1;
 259                 polygonelement3s[i * 3 + 2] = i + 2;
 260         }
 261         // elements for rendering a series of quads as triangles
 262         for (i = 0;i < QUADELEMENTS_MAXQUADS;i++)
 263         {
 264                 quadelement3s[i * 6 + 0] = i * 4;
 265                 quadelement3s[i * 6 + 1] = i * 4 + 1;
 266                 quadelement3s[i * 6 + 2] = i * 4 + 2;
 267                 quadelement3s[i * 6 + 3] = i * 4;
 268                 quadelement3s[i * 6 + 4] = i * 4 + 2;
 269                 quadelement3s[i * 6 + 5] = i * 4 + 3;
 270         }
 271
 272         for (i = 0;i < (POLYGONELEMENTS_MAXPOINTS - 2)*3;i++)
 273                 polygonelement3i[i] = polygonelement3s[i];
 274         for (i = 0;i < QUADELEMENTS_MAXQUADS*3;i++)
 275                 quadelement3i[i] = quadelement3s[i];
 276
 277         Cvar_RegisterVariable(&r_render);
 278         Cvar_RegisterVariable(&r_renderview);
 279         Cvar_RegisterVariable(&r_waterwarp);
 280         Cvar_RegisterVariable(&gl_polyblend);
 281         Cvar_RegisterVariable(&v_flipped);
 282         Cvar_RegisterVariable(&gl_dither);
 283         Cvar_RegisterVariable(&gl_vbo);
 284         Cvar_RegisterVariable(&gl_paranoid);
 285         Cvar_RegisterVariable(&gl_printcheckerror);
 286
 287         Cvar_RegisterVariable(&gl_mesh_drawrangeelements);
 288         Cvar_RegisterVariable(&gl_mesh_testarrayelement);
 289         Cvar_RegisterVariable(&gl_mesh_testmanualfeeding);
 290         Cvar_RegisterVariable(&gl_mesh_prefer_short_elements);
 291
 292         Cmd_AddCommand("gl_vbostats", GL_VBOStats_f, "prints a list of all buffer objects (vertex data and triangle elements) and total video memory used by them");
 293
 294         R_RegisterModule("GL_Backend", gl_backend_start, gl_backend_shutdown, gl_backend_newmap, NULL, NULL);
 295 }
 296
 297 void GL_SetMirrorState(qboolean state);
 298
 299 void R_Viewport_TransformToScreen(const r_viewport_t *v, const vec4_t in, vec4_t out)
 300 {
 301         vec4_t temp;
 302         float iw;
 303         Matrix4x4_Transform4 (&v->viewmatrix, in, temp);
 304         Matrix4x4_Transform4 (&v->projectmatrix, temp, out);
 305         iw = 1.0f / out[3];
 306         out[0] = v->x + (out[0] * iw + 1.0f) * v->width * 0.5f;
 307
 308         // for an odd reason, inverting this is wrong for R_Shadow_ScissorForBBox (we then get badly scissored lights)
 309         //out[1] = v->y + v->height - (out[1] * iw + 1.0f) * v->height * 0.5f;
 310         out[1] = v->y + (out[1] * iw + 1.0f) * v->height * 0.5f;
 311
 312         out[2] = v->z + (out[2] * iw + 1.0f) * v->depth * 0.5f;
 313 }
 314
 315 static int bboxedges[12][2] =
 316 {
 317         // top
 318         {0, 1}, // +X
 319         {0, 2}, // +Y
 320         {1, 3}, // Y, +X
 321         {2, 3}, // X, +Y
 322         // bottom
 323         {4, 5}, // +X
 324         {4, 6}, // +Y
 325         {5, 7}, // Y, +X
 326         {6, 7}, // X, +Y
 327         // verticals
 328         {0, 4}, // +Z
 329         {1, 5}, // X, +Z
 330         {2, 6}, // Y, +Z
 331         {3, 7}, // XY, +Z
 332 };
 333
 334 qboolean R_ScissorForBBox(const float *mins, const float *maxs, int *scissor)
 335 {
 336         int i, ix1, iy1, ix2, iy2;
 337         float x1, y1, x2, y2;
 338         vec4_t v, v2;
 339         float vertex[20][3];
 340         int j, k;
 341         vec4_t plane4f;
 342         int numvertices;
 343         float corner[8][4];
 344         float dist[8];
 345         int sign[8];
 346         float f;
 347
 348         scissor[0] = r_refdef.view.viewport.x;
 349         scissor[1] = r_refdef.view.viewport.y;
 350         scissor[2] = r_refdef.view.viewport.width;
 351         scissor[3] = r_refdef.view.viewport.height;
 352
 353         // if view is inside the box, just say yes it's visible
 354         if (BoxesOverlap(r_refdef.view.origin, r_refdef.view.origin, mins, maxs))
 355                 return false;
 356
 357         x1 = y1 = x2 = y2 = 0;
 358
 359         // transform all corners that are infront of the nearclip plane
 360         VectorNegate(r_refdef.view.frustum[4].normal, plane4f);
 361         plane4f[3] = r_refdef.view.frustum[4].dist;
 362         numvertices = 0;
 363         for (i = 0;i < 8;i++)
 364         {
 365                 Vector4Set(corner[i], (i & 1) ? maxs[0] : mins[0], (i & 2) ? maxs[1] : mins[1], (i & 4) ? maxs[2] : mins[2], 1);
 366                 dist[i] = DotProduct4(corner[i], plane4f);
 367                 sign[i] = dist[i] > 0;
 368                 if (!sign[i])
 369                 {
 370                         VectorCopy(corner[i], vertex[numvertices]);
 371                         numvertices++;
 372                 }
 373         }
 374         // if some points are behind the nearclip, add clipped edge points to make
 375         // sure that the scissor boundary is complete
 376         if (numvertices > 0 && numvertices < 8)
 377         {
 378                 // add clipped edge points
 379                 for (i = 0;i < 12;i++)
 380                 {
 381                         j = bboxedges[i][0];
 382                         k = bboxedges[i][1];
 383                         if (sign[j] != sign[k])
 384                         {
 385                                 f = dist[j] / (dist[j] - dist[k]);
 386                                 VectorLerp(corner[j], f, corner[k], vertex[numvertices]);
 387                                 numvertices++;
 388                         }
 389                 }
 390         }
 391
 392         // if we have no points to check, it is behind the view plane
 393         if (!numvertices)
 394                 return true;
 395
 396         // if we have some points to transform, check what screen area is covered
 397         x1 = y1 = x2 = y2 = 0;
 398         v[3] = 1.0f;
 399         //Con_Printf("%i vertices to transform...\n", numvertices);
 400         for (i = 0;i < numvertices;i++)
 401         {
 402                 VectorCopy(vertex[i], v);
 403                 R_Viewport_TransformToScreen(&r_refdef.view.viewport, v, v2);
 404                 //Con_Printf("%.3f %.3f %.3f %.3f transformed to %.3f %.3f %.3f %.3f\n", v[0], v[1], v[2], v[3], v2[0], v2[1], v2[2], v2[3]);
 405                 if (i)
 406                 {
 407                         if (x1 > v2[0]) x1 = v2[0];
 408                         if (x2 < v2[0]) x2 = v2[0];
 409                         if (y1 > v2[1]) y1 = v2[1];
 410                         if (y2 < v2[1]) y2 = v2[1];
 411                 }
 412                 else
 413                 {
 414                         x1 = x2 = v2[0];
 415                         y1 = y2 = v2[1];
 416                 }
 417         }
 418
 419         // now convert the scissor rectangle to integer screen coordinates
 420         ix1 = (int)(x1 - 1.0f);
 421         //iy1 = vid.height - (int)(y2 - 1.0f);
 422         //iy1 = r_refdef.view.viewport.width + 2 * r_refdef.view.viewport.x - (int)(y2 - 1.0f);
 423         iy1 = (int)(y1 - 1.0f);
 424         ix2 = (int)(x2 + 1.0f);
 425         //iy2 = vid.height - (int)(y1 + 1.0f);
 426         //iy2 = r_refdef.view.viewport.height + 2 * r_refdef.view.viewport.y - (int)(y1 + 1.0f);
 427         iy2 = (int)(y2 + 1.0f);
 428         //Con_Printf("%f %f %f %f\n", x1, y1, x2, y2);
 429
 430         // clamp it to the screen
 431         if (ix1 < r_refdef.view.viewport.x) ix1 = r_refdef.view.viewport.x;
 432         if (iy1 < r_refdef.view.viewport.y) iy1 = r_refdef.view.viewport.y;
 433         if (ix2 > r_refdef.view.viewport.x + r_refdef.view.viewport.width) ix2 = r_refdef.view.viewport.x + r_refdef.view.viewport.width;
 434         if (iy2 > r_refdef.view.viewport.y + r_refdef.view.viewport.height) iy2 = r_refdef.view.viewport.y + r_refdef.view.viewport.height;
 435
 436         // if it is inside out, it's not visible
 437         if (ix2 <= ix1 || iy2 <= iy1)
 438                 return true;
 439
 440         // the light area is visible, set up the scissor rectangle
 441         scissor[0] = ix1;
 442         scissor[1] = iy1;
 443         scissor[2] = ix2 - ix1;
 444         scissor[3] = iy2 - iy1;
 445
 446         // D3D Y coordinate is top to bottom, OpenGL is bottom to top, fix the D3D one
 447         switch(vid.renderpath)
 448         {
 449         case RENDERPATH_D3D9:
 450         case RENDERPATH_D3D10:
 451         case RENDERPATH_D3D11:
 452                 scissor[1] = vid.height - scissor[1] - scissor[3];
 453                 break;
 454         case RENDERPATH_GL11:
 455         case RENDERPATH_GL13:
 456         case RENDERPATH_GL20:
 457         case RENDERPATH_CGGL:
 458                 break;
 459         }
 460
 461         return false;
 462 }
 463
 464
 465 static void R_Viewport_ApplyNearClipPlaneFloatGL(const r_viewport_t *v, float *m, float normalx, float normaly, float normalz, float dist)
 466 {
 467         float q[4];
 468         float d;
 469         float clipPlane[4], v3[3], v4[3];
 470         float normal[3];
 471
 472         // This is inspired by Oblique Depth Projection from http://www.terathon.com/code/oblique.php
 473
 474         VectorSet(normal, normalx, normaly, normalz);
 475         Matrix4x4_Transform3x3(&v->viewmatrix, normal, clipPlane);
 476         VectorScale(normal, dist, v3);
 477         Matrix4x4_Transform(&v->viewmatrix, v3, v4);
 478         // FIXME: LordHavoc: I think this can be done more efficiently somehow but I can't remember the technique
 479         clipPlane[3] = -DotProduct(v4, clipPlane);
 480
 481 #if 0
 482 {
 483         // testing code for comparing results
 484         float clipPlane2[4];
 485         VectorCopy4(clipPlane, clipPlane2);
 486         R_EntityMatrix(&identitymatrix);
 487         VectorSet(q, normal[0], normal[1], normal[2], -dist);
 488         qglClipPlane(GL_CLIP_PLANE0, q);
 489         qglGetClipPlane(GL_CLIP_PLANE0, q);
 490         VectorCopy4(q, clipPlane);
 491 }
 492 #endif
 493
 494         // Calculate the clip-space corner point opposite the clipping plane
 495         // as (sgn(clipPlane.x), sgn(clipPlane.y), 1, 1) and
 496         // transform it into camera space by multiplying it
 497         // by the inverse of the projection matrix
 498         q[0] = ((clipPlane[0] < 0.0f ? -1.0f : clipPlane[0] > 0.0f ? 1.0f : 0.0f) + m[8]) / m[0];
 499         q[1] = ((clipPlane[1] < 0.0f ? -1.0f : clipPlane[1] > 0.0f ? 1.0f : 0.0f) + m[9]) / m[5];
 500         q[2] = -1.0f;
 501         q[3] = (1.0f + m[10]) / m[14];
 502
 503         // Calculate the scaled plane vector
 504         d = 2.0f / DotProduct4(clipPlane, q);
 505
 506         // Replace the third row of the projection matrix
 507         m[2] = clipPlane[0] * d;
 508         m[6] = clipPlane[1] * d;
 509         m[10] = clipPlane[2] * d + 1.0f;
 510         m[14] = clipPlane[3] * d;
 511 }
 512
 513 void R_Viewport_InitOrtho(r_viewport_t *v, const matrix4x4_t *cameramatrix, int x, int y, int width, int height, float x1, float y1, float x2, float y2, float nearclip, float farclip, const float *nearplane)
 514 {
 515         float left = x1, right = x2, bottom = y2, top = y1, zNear = nearclip, zFar = farclip;
 516         float m[16];
 517         memset(v, 0, sizeof(*v));
 518         v->type = R_VIEWPORTTYPE_ORTHO;
 519         v->cameramatrix = *cameramatrix;
 520         v->x = x;
 521         v->y = y;
 522         v->z = 0;
 523         v->width = width;
 524         v->height = height;
 525         v->depth = 1;
 526         memset(m, 0, sizeof(m));
 527         m[0]  = 2/(right - left);
 528         m[5]  = 2/(top - bottom);
 529         m[10] = -2/(zFar - zNear);
 530         m[12] = - (right + left)/(right - left);
 531         m[13] = - (top + bottom)/(top - bottom);
 532         m[14] = - (zFar + zNear)/(zFar - zNear);
 533         m[15] = 1;
 534         v->screentodepth[0] = -farclip / (farclip - nearclip);
 535         v->screentodepth[1] = farclip * nearclip / (farclip - nearclip);
 536
 537         Matrix4x4_Invert_Full(&v->viewmatrix, &v->cameramatrix);
 538
 539         if (nearplane)
 540                 R_Viewport_ApplyNearClipPlaneFloatGL(v, m, nearplane[0], nearplane[1], nearplane[2], nearplane[3]);
 541
 542         Matrix4x4_FromArrayFloatGL(&v->projectmatrix, m);
 543
 544 #if 0
 545         {
 546                 vec4_t test1;
 547                 vec4_t test2;
 548                 Vector4Set(test1, (x1+x2)*0.5f, (y1+y2)*0.5f, 0.0f, 1.0f);
 549                 R_Viewport_TransformToScreen(v, test1, test2);
 550                 Con_Printf("%f %f %f -> %f %f %f\n", test1[0], test1[1], test1[2], test2[0], test2[1], test2[2]);
 551         }
 552 #endif
 553 }
 554
 555 void R_Viewport_InitPerspective(r_viewport_t *v, const matrix4x4_t *cameramatrix, int x, int y, int width, int height, float frustumx, float frustumy, float nearclip, float farclip, const float *nearplane)
 556 {
 557         matrix4x4_t tempmatrix, basematrix;
 558         float m[16];
 559         memset(v, 0, sizeof(*v));
 560
 561         v->type = R_VIEWPORTTYPE_PERSPECTIVE;
 562         v->cameramatrix = *cameramatrix;
 563         v->x = x;
 564         v->y = y;
 565         v->z = 0;
 566         v->width = width;
 567         v->height = height;
 568         v->depth = 1;
 569         memset(m, 0, sizeof(m));
 570         m[0]  = 1.0 / frustumx;
 571         m[5]  = 1.0 / frustumy;
 572         m[10] = -(farclip + nearclip) / (farclip - nearclip);
 573         m[11] = -1;
 574         m[14] = -2 * nearclip * farclip / (farclip - nearclip);
 575         v->screentodepth[0] = -farclip / (farclip - nearclip);
 576         v->screentodepth[1] = farclip * nearclip / (farclip - nearclip);
 577
 578         Matrix4x4_Invert_Full(&tempmatrix, &v->cameramatrix);
 579         Matrix4x4_CreateRotate(&basematrix, -90, 1, 0, 0);
 580         Matrix4x4_ConcatRotate(&basematrix, 90, 0, 0, 1);
 581         Matrix4x4_Concat(&v->viewmatrix, &basematrix, &tempmatrix);
 582
 583         if (nearplane)
 584                 R_Viewport_ApplyNearClipPlaneFloatGL(v, m, nearplane[0], nearplane[1], nearplane[2], nearplane[3]);
 585
 586         if(v_flipped.integer)
 587         {
 588                 m[0] = -m[0];
 589                 m[4] = -m[4];
 590                 m[8] = -m[8];
 591                 m[12] = -m[12];
 592         }
 593
 594         Matrix4x4_FromArrayFloatGL(&v->projectmatrix, m);
 595 }
 596
 597 void R_Viewport_InitPerspectiveInfinite(r_viewport_t *v, const matrix4x4_t *cameramatrix, int x, int y, int width, int height, float frustumx, float frustumy, float nearclip, const float *nearplane)
 598 {
 599         matrix4x4_t tempmatrix, basematrix;
 600         const float nudge = 1.0 - 1.0 / (1<<23);
 601         float m[16];
 602         memset(v, 0, sizeof(*v));
 603
 604         v->type = R_VIEWPORTTYPE_PERSPECTIVE_INFINITEFARCLIP;
 605         v->cameramatrix = *cameramatrix;
 606         v->x = x;
 607         v->y = y;
 608         v->z = 0;
 609         v->width = width;
 610         v->height = height;
 611         v->depth = 1;
 612         memset(m, 0, sizeof(m));
 613         m[ 0] = 1.0 / frustumx;
 614         m[ 5] = 1.0 / frustumy;
 615         m[10] = -nudge;
 616         m[11] = -1;
 617         m[14] = -2 * nearclip * nudge;
 618         v->screentodepth[0] = (m[10] + 1) * 0.5 - 1;
 619         v->screentodepth[1] = m[14] * -0.5;
 620
 621         Matrix4x4_Invert_Full(&tempmatrix, &v->cameramatrix);
 622         Matrix4x4_CreateRotate(&basematrix, -90, 1, 0, 0);
 623         Matrix4x4_ConcatRotate(&basematrix, 90, 0, 0, 1);
 624         Matrix4x4_Concat(&v->viewmatrix, &basematrix, &tempmatrix);
 625
 626         if (nearplane)
 627                 R_Viewport_ApplyNearClipPlaneFloatGL(v, m, nearplane[0], nearplane[1], nearplane[2], nearplane[3]);
 628
 629         if(v_flipped.integer)
 630         {
 631                 m[0] = -m[0];
 632                 m[4] = -m[4];
 633                 m[8] = -m[8];
 634                 m[12] = -m[12];
 635         }
 636
 637         Matrix4x4_FromArrayFloatGL(&v->projectmatrix, m);
 638 }
 639
 640 float cubeviewmatrix[6][16] =
 641 {
 642     // standard cubemap projections
 643     { // +X
 644          0, 0,-1, 0,
 645          0,-1, 0, 0,
 646         -1, 0, 0, 0,
 647          0, 0, 0, 1,
 648     },
 649     { // -X
 650          0, 0, 1, 0,
 651          0,-1, 0, 0,
 652          1, 0, 0, 0,
 653          0, 0, 0, 1,
 654     },
 655     { // +Y
 656          1, 0, 0, 0,
 657          0, 0,-1, 0,
 658          0, 1, 0, 0,
 659          0, 0, 0, 1,
 660     },
 661     { // -Y
 662          1, 0, 0, 0,
 663          0, 0, 1, 0,
 664          0,-1, 0, 0,
 665          0, 0, 0, 1,
 666     },
 667     { // +Z
 668          1, 0, 0, 0,
 669          0,-1, 0, 0,
 670          0, 0,-1, 0,
 671          0, 0, 0, 1,
 672     },
 673     { // -Z
 674         -1, 0, 0, 0,
 675          0,-1, 0, 0,
 676          0, 0, 1, 0,
 677          0, 0, 0, 1,
 678     },
 679 };
 680 float rectviewmatrix[6][16] =
 681 {
 682     // sign-preserving cubemap projections
 683     { // +X
 684          0, 0,-1, 0,
 685          0, 1, 0, 0,
 686          1, 0, 0, 0,
 687          0, 0, 0, 1,
 688     },
 689     { // -X
 690          0, 0, 1, 0,
 691          0, 1, 0, 0,
 692          1, 0, 0, 0,
 693          0, 0, 0, 1,
 694     },
 695     { // +Y
 696          1, 0, 0, 0,
 697          0, 0,-1, 0,
 698          0, 1, 0, 0,
 699          0, 0, 0, 1,
 700     },
 701     { // -Y
 702          1, 0, 0, 0,
 703          0, 0, 1, 0,
 704          0, 1, 0, 0,
 705          0, 0, 0, 1,
 706     },
 707     { // +Z
 708          1, 0, 0, 0,
 709          0, 1, 0, 0,
 710          0, 0,-1, 0,
 711          0, 0, 0, 1,
 712     },
 713     { // -Z
 714          1, 0, 0, 0,
 715          0, 1, 0, 0,
 716          0, 0, 1, 0,
 717          0, 0, 0, 1,
 718     },
 719 };
 720
 721 void R_Viewport_InitCubeSideView(r_viewport_t *v, const matrix4x4_t *cameramatrix, int side, int size, float nearclip, float farclip, const float *nearplane)
 722 {
 723         matrix4x4_t tempmatrix, basematrix;
 724         float m[16];
 725         memset(v, 0, sizeof(*v));
 726         v->type = R_VIEWPORTTYPE_PERSPECTIVECUBESIDE;
 727         v->cameramatrix = *cameramatrix;
 728         v->width = size;
 729         v->height = size;
 730         v->depth = 1;
 731         memset(m, 0, sizeof(m));
 732         m[0] = m[5] = 1.0f;
 733         m[10] = -(farclip + nearclip) / (farclip - nearclip);
 734         m[11] = -1;
 735         m[14] = -2 * nearclip * farclip / (farclip - nearclip);
 736
 737         Matrix4x4_FromArrayFloatGL(&basematrix, cubeviewmatrix[side]);
 738         Matrix4x4_Invert_Simple(&tempmatrix, &v->cameramatrix);
 739         Matrix4x4_Concat(&v->viewmatrix, &basematrix, &tempmatrix);
 740
 741         if (nearplane)
 742                 R_Viewport_ApplyNearClipPlaneFloatGL(v, m, nearplane[0], nearplane[1], nearplane[2], nearplane[3]);
 743
 744         Matrix4x4_FromArrayFloatGL(&v->projectmatrix, m);
 745 }
 746
 747 void R_Viewport_InitRectSideView(r_viewport_t *v, const matrix4x4_t *cameramatrix, int side, int size, int border, float nearclip, float farclip, const float *nearplane)
 748 {
 749         matrix4x4_t tempmatrix, basematrix;
 750         float m[16];
 751         memset(v, 0, sizeof(*v));
 752         v->type = R_VIEWPORTTYPE_PERSPECTIVECUBESIDE;
 753         v->cameramatrix = *cameramatrix;
 754         v->x = (side & 1) * size;
 755         v->y = (side >> 1) * size;
 756         v->width = size;
 757         v->height = size;
 758         v->depth = 1;
 759         memset(m, 0, sizeof(m));
 760         m[0] = m[5] = 1.0f * ((float)size - border) / size;
 761         m[10] = -(farclip + nearclip) / (farclip - nearclip);
 762         m[11] = -1;
 763         m[14] = -2 * nearclip * farclip / (farclip - nearclip);
 764
 765         Matrix4x4_FromArrayFloatGL(&basematrix, rectviewmatrix[side]);
 766         Matrix4x4_Invert_Simple(&tempmatrix, &v->cameramatrix);
 767         Matrix4x4_Concat(&v->viewmatrix, &basematrix, &tempmatrix);
 768
 769         if (nearplane)
 770                 R_Viewport_ApplyNearClipPlaneFloatGL(v, m, nearplane[0], nearplane[1], nearplane[2], nearplane[3]);
 771
 772         Matrix4x4_FromArrayFloatGL(&v->projectmatrix, m);
 773 }
 774
 775 void R_SetViewport(const r_viewport_t *v)
 776 {
 777         float m[16];
 778         gl_viewport = *v;
 779
 780         CHECKGLERROR
 781         qglViewport(v->x, v->y, v->width, v->height);CHECKGLERROR
 782
 783         // FIXME: v_flipped_state is evil, this probably breaks somewhere
 784         GL_SetMirrorState(v_flipped.integer && (v->type == R_VIEWPORTTYPE_PERSPECTIVE || v->type == R_VIEWPORTTYPE_PERSPECTIVE_INFINITEFARCLIP));
 785
 786         // copy over the matrices to our state
 787         gl_viewmatrix = v->viewmatrix;
 788         gl_projectionmatrix = v->projectmatrix;
 789
 790         switch(vid.renderpath)
 791         {
 792         case RENDERPATH_GL20:
 793         case RENDERPATH_CGGL:
 794 //              break;
 795         case RENDERPATH_GL13:
 796         case RENDERPATH_GL11:
 797                 // Load the projection matrix into OpenGL
 798                 qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 799                 Matrix4x4_ToArrayFloatGL(&gl_projectionmatrix, m);
 800                 qglLoadMatrixf(m);CHECKGLERROR
 801                 qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 802                 break;
 803         }
 804
 805         // force an update of the derived matrices
 806         gl_modelmatrixchanged = true;
 807         R_EntityMatrix(&gl_modelmatrix);
 808 }
 809
 810 void R_GetViewport(r_viewport_t *v)
 811 {
 812         *v = gl_viewport;
 813 }
 814
 815 static void GL_BindVBO(int bufferobject)
 816 {
 817         if (gl_state.vertexbufferobject != bufferobject)
 818         {
 819                 gl_state.vertexbufferobject = bufferobject;
 820                 CHECKGLERROR
 821                 qglBindBufferARB(GL_ARRAY_BUFFER_ARB, bufferobject);
 822                 CHECKGLERROR
 823         }
 824 }
 825
 826 static void GL_BindEBO(int bufferobject)
 827 {
 828         if (gl_state.elementbufferobject != bufferobject)
 829         {
 830                 gl_state.elementbufferobject = bufferobject;
 831                 CHECKGLERROR
 832                 qglBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, bufferobject);
 833                 CHECKGLERROR
 834         }
 835 }
 836
 837 static void GL_Backend_ResetState(void)
 838 {
 839         unsigned int i;
 840         gl_state.active = true;
 841         gl_state.depthtest = true;
 842         gl_state.alphatest = false;
 843         gl_state.blendfunc1 = GL_ONE;
 844         gl_state.blendfunc2 = GL_ZERO;
 845         gl_state.blend = false;
 846         gl_state.depthmask = GL_TRUE;
 847         gl_state.colormask = 15;
 848         gl_state.color4f[0] = gl_state.color4f[1] = gl_state.color4f[2] = gl_state.color4f[3] = 1;
 849         gl_state.lockrange_first = 0;
 850         gl_state.lockrange_count = 0;
 851         gl_state.cullface = v_flipped_state ? GL_BACK : GL_FRONT; // quake is backwards, this culls back faces
 852         gl_state.cullfaceenable = true;
 853         gl_state.polygonoffset[0] = 0;
 854         gl_state.polygonoffset[1] = 0;
 855
 856         CHECKGLERROR
 857
 858         qglColorMask(1, 1, 1, 1);
 859         qglAlphaFunc(GL_GEQUAL, 0.5);CHECKGLERROR
 860         qglDisable(GL_ALPHA_TEST);CHECKGLERROR
 861         qglBlendFunc(gl_state.blendfunc1, gl_state.blendfunc2);CHECKGLERROR
 862         qglDisable(GL_BLEND);CHECKGLERROR
 863         qglCullFace(gl_state.cullface);CHECKGLERROR
 864         qglEnable(GL_CULL_FACE);CHECKGLERROR
 865         qglDepthFunc(GL_LEQUAL);CHECKGLERROR
 866         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 867         qglDepthMask(gl_state.depthmask);CHECKGLERROR
 868         qglPolygonOffset(gl_state.polygonoffset[0], gl_state.polygonoffset[1]);
 869
 870         if (vid.support.arb_vertex_buffer_object)
 871         {
 872                 qglBindBufferARB(GL_ARRAY_BUFFER_ARB, 0);
 873                 qglBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, 0);
 874         }
 875
 876         if (vid.support.ext_framebuffer_object)
 877         {
 878                 qglBindRenderbufferEXT(GL_RENDERBUFFER_EXT, 0);
 879                 qglBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
 880         }
 881
 882         qglVertexPointer(3, GL_FLOAT, sizeof(float[3]), NULL);CHECKGLERROR
 883         qglEnableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 884
 885         qglColorPointer(4, GL_FLOAT, sizeof(float[4]), NULL);CHECKGLERROR
 886         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 887
 888         GL_Color(0, 0, 0, 0);
 889         GL_Color(1, 1, 1, 1);
 890
 891         gl_state.unit = MAX_TEXTUREUNITS;
 892         gl_state.clientunit = MAX_TEXTUREUNITS;
 893         switch(vid.renderpath)
 894         {
 895         case RENDERPATH_GL20:
 896         case RENDERPATH_CGGL:
 897                 for (i = 0;i < vid.teximageunits;i++)
 898                 {
 899                         GL_ActiveTexture(i);
 900                         qglBindTexture(GL_TEXTURE_2D, 0);CHECKGLERROR
 901                         if (vid.support.ext_texture_3d)
 902                         {
 903                                 qglBindTexture(GL_TEXTURE_3D, 0);CHECKGLERROR
 904                         }
 905                         if (vid.support.arb_texture_cube_map)
 906                         {
 907                                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, 0);CHECKGLERROR
 908                         }
 909                         if (vid.support.arb_texture_rectangle)
 910                         {
 911                                 qglBindTexture(GL_TEXTURE_RECTANGLE_ARB, 0);CHECKGLERROR
 912                         }
 913                 }
 914
 915                 for (i = 0;i < vid.texarrayunits;i++)
 916                 {
 917                         GL_ClientActiveTexture(i);
 918                         GL_BindVBO(0);
 919                         qglTexCoordPointer(2, GL_FLOAT, sizeof(float[2]), NULL);CHECKGLERROR
 920                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 921                 }
 922                 CHECKGLERROR
 923                 break;
 924         case RENDERPATH_GL13:
 925         case RENDERPATH_GL11:
 926                 for (i = 0;i < vid.texunits;i++)
 927                 {
 928                         GL_ActiveTexture(i);
 929                         GL_ClientActiveTexture(i);
 930                         qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 931                         qglBindTexture(GL_TEXTURE_2D, 0);CHECKGLERROR
 932                         if (vid.support.ext_texture_3d)
 933                         {
 934                                 qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 935                                 qglBindTexture(GL_TEXTURE_3D, 0);CHECKGLERROR
 936                         }
 937                         if (vid.support.arb_texture_cube_map)
 938                         {
 939                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 940                                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, 0);CHECKGLERROR
 941                         }
 942                         if (vid.support.arb_texture_rectangle)
 943                         {
 944                                 qglDisable(GL_TEXTURE_RECTANGLE_ARB);CHECKGLERROR
 945                                 qglBindTexture(GL_TEXTURE_RECTANGLE_ARB, 0);CHECKGLERROR
 946                         }
 947                         GL_BindVBO(0);
 948                         qglTexCoordPointer(2, GL_FLOAT, sizeof(float[2]), NULL);CHECKGLERROR
 949                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 950                         qglMatrixMode(GL_TEXTURE);CHECKGLERROR
 951                         qglLoadIdentity();CHECKGLERROR
 952                         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 953                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 954                 }
 955                 CHECKGLERROR
 956                 break;
 957         }
 958 }
 959
 960 void GL_ActiveTexture(unsigned int num)
 961 {
 962         if (gl_state.unit != num)
 963         {
 964                 gl_state.unit = num;
 965                 if (qglActiveTexture)
 966                 {
 967                         CHECKGLERROR
 968                         qglActiveTexture(GL_TEXTURE0_ARB + gl_state.unit);
 969                         CHECKGLERROR
 970                 }
 971         }
 972 }
 973
 974 void GL_ClientActiveTexture(unsigned int num)
 975 {
 976         if (gl_state.clientunit != num)
 977         {
 978                 gl_state.clientunit = num;
 979                 if (qglActiveTexture)
 980                 {
 981                         CHECKGLERROR
 982                         qglClientActiveTexture(GL_TEXTURE0_ARB + gl_state.clientunit);
 983                         CHECKGLERROR
 984                 }
 985         }
 986 }
 987
 988 void GL_BlendFunc(int blendfunc1, int blendfunc2)
 989 {
 990         if (gl_state.blendfunc1 != blendfunc1 || gl_state.blendfunc2 != blendfunc2)
 991         {
 992                 CHECKGLERROR
 993                 qglBlendFunc(gl_state.blendfunc1 = blendfunc1, gl_state.blendfunc2 = blendfunc2);CHECKGLERROR
 994                 if (gl_state.blendfunc2 == GL_ZERO)
 995                 {
 996                         if (gl_state.blendfunc1 == GL_ONE)
 997                         {
 998                                 if (gl_state.blend)
 999                                 {
1000                                         gl_state.blend = 0;
1001                                         qglDisable(GL_BLEND);CHECKGLERROR
1002                                 }
1003                         }
1004                         else
1005                         {
1006                                 if (!gl_state.blend)
1007                                 {
1008                                         gl_state.blend = 1;
1009                                         qglEnable(GL_BLEND);CHECKGLERROR
1010                                 }
1011                         }
1012                 }
1013                 else
1014                 {
1015                         if (!gl_state.blend)
1016                         {
1017                                 gl_state.blend = 1;
1018                                 qglEnable(GL_BLEND);CHECKGLERROR
1019                         }
1020                 }
1021         }
1022 }
1023
1024 void GL_DepthMask(int state)
1025 {
1026         if (gl_state.depthmask != state)
1027         {
1028                 CHECKGLERROR
1029                 qglDepthMask(gl_state.depthmask = state);CHECKGLERROR
1030         }
1031 }
1032
1033 void GL_DepthTest(int state)
1034 {
1035         if (gl_state.depthtest != state)
1036         {
1037                 gl_state.depthtest = state;
1038                 CHECKGLERROR
1039                 if (gl_state.depthtest)
1040                 {
1041                         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
1042                 }
1043                 else
1044                 {
1045                         qglDisable(GL_DEPTH_TEST);CHECKGLERROR
1046                 }
1047         }
1048 }
1049
1050 void GL_DepthRange(float nearfrac, float farfrac)
1051 {
1052         if (gl_state.depthrange[0] != nearfrac || gl_state.depthrange[1] != farfrac)
1053         {
1054                 gl_state.depthrange[0] = nearfrac;
1055                 gl_state.depthrange[1] = farfrac;
1056                 qglDepthRange(nearfrac, farfrac);
1057         }
1058 }
1059
1060 void GL_PolygonOffset(float planeoffset, float depthoffset)
1061 {
1062         if (gl_state.polygonoffset[0] != planeoffset || gl_state.polygonoffset[1] != depthoffset)
1063         {
1064                 gl_state.polygonoffset[0] = planeoffset;
1065                 gl_state.polygonoffset[1] = depthoffset;
1066                 qglPolygonOffset(planeoffset, depthoffset);
1067         }
1068 }
1069
1070 void GL_SetMirrorState(qboolean state)
1071 {
1072         if(!state != !v_flipped_state)
1073         {
1074                 // change cull face mode!
1075                 if(gl_state.cullface == GL_BACK)
1076                         qglCullFace((gl_state.cullface = GL_FRONT));
1077                 else if(gl_state.cullface == GL_FRONT)
1078                         qglCullFace((gl_state.cullface = GL_BACK));
1079         }
1080         v_flipped_state = state;
1081 }
1082
1083 void GL_CullFace(int state)
1084 {
1085         CHECKGLERROR
1086
1087         if(v_flipped_state)
1088         {
1089                 if(state == GL_FRONT)
1090                         state = GL_BACK;
1091                 else if(state == GL_BACK)
1092                         state = GL_FRONT;
1093         }
1094
1095         if (state != GL_NONE)
1096         {
1097                 if (!gl_state.cullfaceenable)
1098                 {
1099                         gl_state.cullfaceenable = true;
1100                         qglEnable(GL_CULL_FACE);CHECKGLERROR
1101                 }
1102                 if (gl_state.cullface != state)
1103                 {
1104                         gl_state.cullface = state;
1105                         qglCullFace(gl_state.cullface);CHECKGLERROR
1106                 }
1107         }
1108         else
1109         {
1110                 if (gl_state.cullfaceenable)
1111                 {
1112                         gl_state.cullfaceenable = false;
1113                         qglDisable(GL_CULL_FACE);CHECKGLERROR
1114                 }
1115         }
1116 }
1117
1118 void GL_AlphaTest(int state)
1119 {
1120         if (gl_state.alphatest != state)
1121         {
1122                 gl_state.alphatest = state;
1123                 CHECKGLERROR
1124                 if (gl_state.alphatest)
1125                 {
1126                         qglEnable(GL_ALPHA_TEST);CHECKGLERROR
1127                 }
1128                 else
1129                 {
1130                         qglDisable(GL_ALPHA_TEST);CHECKGLERROR
1131                 }
1132         }
1133 }
1134
1135 void GL_ColorMask(int r, int g, int b, int a)
1136 {
1137         int state = r*8 + g*4 + b*2 + a*1;
1138         if (gl_state.colormask != state)
1139         {
1140                 gl_state.colormask = state;
1141                 CHECKGLERROR
1142                 qglColorMask((GLboolean)r, (GLboolean)g, (GLboolean)b, (GLboolean)a);CHECKGLERROR
1143         }
1144 }
1145
1146 void GL_Color(float cr, float cg, float cb, float ca)
1147 {
1148         if (gl_state.pointer_color_enabled || gl_state.color4f[0] != cr || gl_state.color4f[1] != cg || gl_state.color4f[2] != cb || gl_state.color4f[3] != ca)
1149         {
1150                 gl_state.color4f[0] = cr;
1151                 gl_state.color4f[1] = cg;
1152                 gl_state.color4f[2] = cb;
1153                 gl_state.color4f[3] = ca;
1154                 CHECKGLERROR
1155                 qglColor4f(gl_state.color4f[0], gl_state.color4f[1], gl_state.color4f[2], gl_state.color4f[3]);
1156                 CHECKGLERROR
1157         }
1158 }
1159
1160 void GL_Scissor (int x, int y, int width, int height)
1161 {
1162         CHECKGLERROR
1163         qglScissor(x, y,width,height);
1164         CHECKGLERROR
1165 }
1166
1167 void GL_ScissorTest(int state)
1168 {
1169         if(gl_state.scissortest == state)
1170                 return;
1171
1172         CHECKGLERROR
1173         if((gl_state.scissortest = state))
1174                 qglEnable(GL_SCISSOR_TEST);
1175         else
1176                 qglDisable(GL_SCISSOR_TEST);
1177         CHECKGLERROR
1178 }
1179
1180 void GL_Clear(int mask)
1181 {
1182         CHECKGLERROR
1183         qglClear(mask);CHECKGLERROR
1184 }
1185
1186 // called at beginning of frame
1187 void R_Mesh_Start(void)
1188 {
1189         BACKENDACTIVECHECK
1190         CHECKGLERROR
1191         if (gl_printcheckerror.integer && !gl_paranoid.integer)
1192         {
1193                 Con_Printf("WARNING: gl_printcheckerror is on but gl_paranoid is off, turning it on...\n");
1194                 Cvar_SetValueQuick(&gl_paranoid, 1);
1195         }
1196 }
1197
1198 qboolean GL_Backend_CompileShader(int programobject, GLenum shadertypeenum, const char *shadertype, int numstrings, const char **strings)
1199 {
1200         int shaderobject;
1201         int shadercompiled;
1202         char compilelog[MAX_INPUTLINE];
1203         shaderobject = qglCreateShaderObjectARB(shadertypeenum);CHECKGLERROR
1204         if (!shaderobject)
1205                 return false;
1206         qglShaderSourceARB(shaderobject, numstrings, strings, NULL);CHECKGLERROR
1207         qglCompileShaderARB(shaderobject);CHECKGLERROR
1208         qglGetObjectParameterivARB(shaderobject, GL_OBJECT_COMPILE_STATUS_ARB, &shadercompiled);CHECKGLERROR
1209         qglGetInfoLogARB(shaderobject, sizeof(compilelog), NULL, compilelog);CHECKGLERROR
1210         if (compilelog[0] && (strstr(compilelog, "error") || strstr(compilelog, "ERROR") || strstr(compilelog, "Error") || strstr(compilelog, "WARNING") || strstr(compilelog, "warning") || strstr(compilelog, "Warning")))
1211         {
1212                 int i, j, pretextlines = 0;
1213                 for (i = 0;i < numstrings - 1;i++)
1214                         for (j = 0;strings[i][j];j++)
1215                                 if (strings[i][j] == '\n')
1216                                         pretextlines++;
1217                 Con_Printf("%s shader compile log:\n%s\n(line offset for any above warnings/errors: %i)\n", shadertype, compilelog, pretextlines);
1218         }
1219         if (!shadercompiled)
1220         {
1221                 qglDeleteObjectARB(shaderobject);CHECKGLERROR
1222                 return false;
1223         }
1224         qglAttachObjectARB(programobject, shaderobject);CHECKGLERROR
1225         qglDeleteObjectARB(shaderobject);CHECKGLERROR
1226         return true;
1227 }
1228
1229 unsigned int GL_Backend_CompileProgram(int vertexstrings_count, const char **vertexstrings_list, int geometrystrings_count, const char **geometrystrings_list, int fragmentstrings_count, const char **fragmentstrings_list)
1230 {
1231         GLint programlinked;
1232         GLuint programobject = 0;
1233         char linklog[MAX_INPUTLINE];
1234         CHECKGLERROR
1235
1236         programobject = qglCreateProgramObjectARB();CHECKGLERROR
1237         if (!programobject)
1238                 return 0;
1239
1240         if (vertexstrings_count && !GL_Backend_CompileShader(programobject, GL_VERTEX_SHADER_ARB, "vertex", vertexstrings_count, vertexstrings_list))
1241                 goto cleanup;
1242
1243 #ifdef GL_GEOMETRY_SHADER_ARB
1244         if (geometrystrings_count && !GL_Backend_CompileShader(programobject, GL_GEOMETRY_SHADER_ARB, "geometry", geometrystrings_count, geometrystrings_list))
1245                 goto cleanup;
1246 #endif
1247
1248         if (fragmentstrings_count && !GL_Backend_CompileShader(programobject, GL_FRAGMENT_SHADER_ARB, "fragment", fragmentstrings_count, fragmentstrings_list))
1249                 goto cleanup;
1250
1251         qglLinkProgramARB(programobject);CHECKGLERROR
1252         qglGetObjectParameterivARB(programobject, GL_OBJECT_LINK_STATUS_ARB, &programlinked);CHECKGLERROR
1253         qglGetInfoLogARB(programobject, sizeof(linklog), NULL, linklog);CHECKGLERROR
1254         if (linklog[0])
1255         {
1256                 if (strstr(linklog, "error") || strstr(linklog, "ERROR") || strstr(linklog, "Error") || strstr(linklog, "WARNING") || strstr(linklog, "warning") || strstr(linklog, "Warning"))
1257                         Con_DPrintf("program link log:\n%s\n", linklog);
1258                 // software vertex shader is ok but software fragment shader is WAY
1259                 // too slow, fail program if so.
1260                 // NOTE: this string might be ATI specific, but that's ok because the
1261                 // ATI R300 chip (Radeon 9500-9800/X300) is the most likely to use a
1262                 // software fragment shader due to low instruction and dependent
1263                 // texture limits.
1264                 if (strstr(linklog, "fragment shader will run in software"))
1265                         programlinked = false;
1266         }
1267         if (!programlinked)
1268                 goto cleanup;
1269         return programobject;
1270 cleanup:
1271         qglDeleteObjectARB(programobject);CHECKGLERROR
1272         return 0;
1273 }
1274
1275 void GL_Backend_FreeProgram(unsigned int prog)
1276 {
1277         CHECKGLERROR
1278         qglDeleteObjectARB(prog);
1279         CHECKGLERROR
1280 }
1281
1282 void GL_Backend_RenumberElements(int *out, int count, const int *in, int offset)
1283 {
1284         int i;
1285         if (offset)
1286         {
1287                 for (i = 0;i < count;i++)
1288                         *out++ = *in++ + offset;
1289         }
1290         else
1291                 memcpy(out, in, sizeof(*out) * count);
1292 }
1293
1294 // renders triangles using vertices from the active arrays
1295 int paranoidblah = 0;
1296 void R_Mesh_Draw(int firstvertex, int numvertices, int firsttriangle, int numtriangles, const int *element3i, const unsigned short *element3s, int bufferobject3i, int bufferobject3s)
1297 {
1298         unsigned int numelements = numtriangles * 3;
1299         if (numvertices < 3 || numtriangles < 1)
1300         {
1301                 if (numvertices < 0 || numtriangles < 0 || developer_extra.integer)
1302                         Con_DPrintf("R_Mesh_Draw(%d, %d, %d, %d, %8p, %8p, %i, %i);\n", firstvertex, numvertices, firsttriangle, numtriangles, (void *)element3i, (void *)element3s, bufferobject3i, bufferobject3s);
1303                 return;
1304         }
1305         if (!gl_mesh_prefer_short_elements.integer)
1306         {
1307                 if (element3i)
1308                         element3s = NULL;
1309                 if (bufferobject3i)
1310                         bufferobject3s = 0;
1311         }
1312         if (element3i)
1313                 element3i += firsttriangle * 3;
1314         if (element3s)
1315                 element3s += firsttriangle * 3;
1316         switch (gl_vbo.integer)
1317         {
1318         default:
1319         case 0:
1320         case 2:
1321                 bufferobject3i = bufferobject3s = 0;
1322                 break;
1323         case 1:
1324                 break;
1325         case 3:
1326                 if (firsttriangle)
1327                         bufferobject3i = bufferobject3s = 0;
1328                 break;
1329         }
1330         CHECKGLERROR
1331         r_refdef.stats.meshes++;
1332         r_refdef.stats.meshes_elements += numelements;
1333         if (gl_paranoid.integer)
1334         {
1335                 unsigned int i, j, size;
1336                 const int *p;
1337                 // note: there's no validation done here on buffer objects because it
1338                 // is somewhat difficult to get at the data, and gl_paranoid can be
1339                 // used without buffer objects if the need arises
1340                 // (the data could be gotten using glMapBuffer but it would be very
1341                 //  slow due to uncachable video memory reads)
1342                 if (!qglIsEnabled(GL_VERTEX_ARRAY))
1343                         Con_Print("R_Mesh_Draw: vertex array not enabled\n");
1344                 CHECKGLERROR
1345                 if (gl_state.pointer_vertex)
1346                         for (j = 0, size = numvertices * 3, p = (int *)((float *)gl_state.pointer_vertex + firstvertex * 3);j < size;j++, p++)
1347                                 paranoidblah += *p;
1348                 if (gl_state.pointer_color_enabled)
1349                 {
1350                         if (!qglIsEnabled(GL_COLOR_ARRAY))
1351                                 Con_Print("R_Mesh_Draw: color array set but not enabled\n");
1352                         CHECKGLERROR
1353                         if (gl_state.pointer_color && gl_state.pointer_color_enabled)
1354                                 for (j = 0, size = numvertices * 4, p = (int *)((float *)gl_state.pointer_color + firstvertex * 4);j < size;j++, p++)
1355                                         paranoidblah += *p;
1356                 }
1357                 for (i = 0;i < vid.texarrayunits;i++)
1358                 {
1359                         if (gl_state.units[i].arrayenabled)
1360                         {
1361                                 GL_ClientActiveTexture(i);
1362                                 if (!qglIsEnabled(GL_TEXTURE_COORD_ARRAY))
1363                                         Con_Print("R_Mesh_Draw: texcoord array set but not enabled\n");
1364                                 CHECKGLERROR
1365                                 if (gl_state.units[i].pointer_texcoord && gl_state.units[i].arrayenabled)
1366                                         for (j = 0, size = numvertices * gl_state.units[i].arraycomponents, p = (int *)((float *)gl_state.units[i].pointer_texcoord + firstvertex * gl_state.units[i].arraycomponents);j < size;j++, p++)
1367                                                 paranoidblah += *p;
1368                         }
1369                 }
1370                 if (element3i)
1371                 {
1372                         for (i = 0;i < (unsigned int) numtriangles * 3;i++)
1373                         {
1374                                 if (element3i[i] < firstvertex || element3i[i] >= firstvertex + numvertices)
1375                                 {
1376                                         Con_Printf("R_Mesh_Draw: invalid vertex index %i (outside range %i - %i) in element3i array\n", element3i[i], firstvertex, firstvertex + numvertices);
1377                                         return;
1378                                 }
1379                         }
1380                 }
1381                 if (element3s)
1382                 {
1383                         for (i = 0;i < (unsigned int) numtriangles * 3;i++)
1384                         {
1385                                 if (element3s[i] < firstvertex || element3s[i] >= firstvertex + numvertices)
1386                                 {
1387                                         Con_Printf("R_Mesh_Draw: invalid vertex index %i (outside range %i - %i) in element3s array\n", element3s[i], firstvertex, firstvertex + numvertices);
1388                                         return;
1389                                 }
1390                         }
1391                 }
1392                 CHECKGLERROR
1393         }
1394         if (r_render.integer || r_refdef.draw2dstage)
1395         {
1396                 CHECKGLERROR
1397                 if (gl_mesh_testmanualfeeding.integer)
1398                 {
1399                         unsigned int i, j, element;
1400                         const GLfloat *p;
1401                         qglBegin(GL_TRIANGLES);
1402                         for (i = 0;i < (unsigned int) numtriangles * 3;i++)
1403                         {
1404                                 element = element3i ? element3i[i] : element3s[i];
1405                                 for (j = 0;j < vid.texarrayunits;j++)
1406                                 {
1407                                         if (gl_state.units[j].pointer_texcoord && gl_state.units[j].arrayenabled)
1408                                         {
1409                                                 if (vid.texarrayunits > 1)
1410                                                 {
1411                                                         if (gl_state.units[j].arraycomponents == 4)
1412                                                         {
1413                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + element * 4;
1414                                                                 qglMultiTexCoord4f(GL_TEXTURE0_ARB + j, p[0], p[1], p[2], p[3]);
1415                                                         }
1416                                                         else if (gl_state.units[j].arraycomponents == 3)
1417                                                         {
1418                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + element * 3;
1419                                                                 qglMultiTexCoord3f(GL_TEXTURE0_ARB + j, p[0], p[1], p[2]);
1420                                                         }
1421                                                         else if (gl_state.units[j].arraycomponents == 2)
1422                                                         {
1423                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + element * 2;
1424                                                                 qglMultiTexCoord2f(GL_TEXTURE0_ARB + j, p[0], p[1]);
1425                                                         }
1426                                                         else
1427                                                         {
1428                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + element * 1;
1429                                                                 qglMultiTexCoord1f(GL_TEXTURE0_ARB + j, p[0]);
1430                                                         }
1431                                                 }
1432                                                 else
1433                                                 {
1434                                                         if (gl_state.units[j].arraycomponents == 4)
1435                                                         {
1436                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + element * 4;
1437                                                                 qglTexCoord4f(p[0], p[1], p[2], p[3]);
1438                                                         }
1439                                                         else if (gl_state.units[j].arraycomponents == 3)
1440                                                         {
1441                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + element * 3;
1442                                                                 qglTexCoord3f(p[0], p[1], p[2]);
1443                                                         }
1444                                                         else if (gl_state.units[j].arraycomponents == 2)
1445                                                         {
1446                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + element * 2;
1447                                                                 qglTexCoord2f(p[0], p[1]);
1448                                                         }
1449                                                         else
1450                                                         {
1451                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + element * 1;
1452                                                                 qglTexCoord1f(p[0]);
1453                                                         }
1454                                                 }
1455                                         }
1456                                 }
1457                                 if (gl_state.pointer_color && gl_state.pointer_color_enabled)
1458                                 {
1459                                         p = ((const GLfloat *)(gl_state.pointer_color)) + element * 4;
1460                                         qglColor4f(p[0], p[1], p[2], p[3]);
1461                                 }
1462                                 p = ((const GLfloat *)(gl_state.pointer_vertex)) + element * 3;
1463                                 qglVertex3f(p[0], p[1], p[2]);
1464                         }
1465                         qglEnd();
1466                         CHECKGLERROR
1467                 }
1468                 else if (gl_mesh_testarrayelement.integer)
1469                 {
1470                         int i;
1471                         qglBegin(GL_TRIANGLES);
1472                         if (element3i)
1473                         {
1474                                 for (i = 0;i < numtriangles * 3;i++)
1475                                         qglArrayElement(element3i[i]);
1476                         }
1477                         else if (element3s)
1478                         {
1479                                 for (i = 0;i < numtriangles * 3;i++)
1480                                         qglArrayElement(element3s[i]);
1481                         }
1482                         qglEnd();
1483                         CHECKGLERROR
1484                 }
1485                 else if (bufferobject3s)
1486                 {
1487                         GL_BindEBO(bufferobject3s);
1488                         if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
1489                         {
1490                                 qglDrawRangeElements(GL_TRIANGLES, firstvertex, firstvertex + numvertices - 1, numelements, GL_UNSIGNED_SHORT, (void *)(firsttriangle * sizeof(unsigned short[3])));
1491                                 CHECKGLERROR
1492                         }
1493                         else
1494                         {
1495                                 qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_SHORT, (void *)(firsttriangle * sizeof(unsigned short[3])));
1496                                 CHECKGLERROR
1497                         }
1498                 }
1499                 else if (bufferobject3i)
1500                 {
1501                         GL_BindEBO(bufferobject3i);
1502                         if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
1503                         {
1504                                 qglDrawRangeElements(GL_TRIANGLES, firstvertex, firstvertex + numvertices - 1, numelements, GL_UNSIGNED_INT, (void *)(firsttriangle * sizeof(unsigned int[3])));
1505                                 CHECKGLERROR
1506                         }
1507                         else
1508                         {
1509                                 qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_INT, (void *)(firsttriangle * sizeof(unsigned int[3])));
1510                                 CHECKGLERROR
1511                         }
1512                 }
1513                 else if (element3s)
1514                 {
1515                         GL_BindEBO(0);
1516                         if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
1517                         {
1518                                 qglDrawRangeElements(GL_TRIANGLES, firstvertex, firstvertex + numvertices - 1, numelements, GL_UNSIGNED_SHORT, element3s);
1519                                 CHECKGLERROR
1520                         }
1521                         else
1522                         {
1523                                 qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_SHORT, element3s);
1524                                 CHECKGLERROR
1525                         }
1526                 }
1527                 else if (element3i)
1528                 {
1529                         GL_BindEBO(0);
1530                         if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
1531                         {
1532                                 qglDrawRangeElements(GL_TRIANGLES, firstvertex, firstvertex + numvertices - 1, numelements, GL_UNSIGNED_INT, element3i);
1533                                 CHECKGLERROR
1534                         }
1535                         else
1536                         {
1537                                 qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_INT, element3i);
1538                                 CHECKGLERROR
1539                         }
1540                 }
1541         }
1542 }
1543
1544 // restores backend state, used when done with 3D rendering
1545 void R_Mesh_Finish(void)
1546 {
1547 }
1548
1549 int R_Mesh_CreateStaticBufferObject(unsigned int target, void *data, size_t size, const char *name)
1550 {
1551         gl_bufferobjectinfo_t *info;
1552         GLuint bufferobject;
1553
1554         if (!gl_vbo.integer)
1555                 return 0;
1556
1557         qglGenBuffersARB(1, &bufferobject);
1558         switch(target)
1559         {
1560         case GL_ELEMENT_ARRAY_BUFFER_ARB: GL_BindEBO(bufferobject);break;
1561         case GL_ARRAY_BUFFER_ARB: GL_BindVBO(bufferobject);break;
1562         default: Sys_Error("R_Mesh_CreateStaticBufferObject: unknown target type %i\n", target);return 0;
1563         }
1564         qglBufferDataARB(target, size, data, GL_STATIC_DRAW_ARB);
1565
1566         info = (gl_bufferobjectinfo_t *) Mem_ExpandableArray_AllocRecord(&gl_state.bufferobjectinfoarray);
1567         memset(info, 0, sizeof(*info));
1568         info->target = target;
1569         info->object = bufferobject;
1570         info->size = size;
1571         strlcpy(info->name, name, sizeof(info->name));
1572
1573         return (int)bufferobject;
1574 }
1575
1576 void R_Mesh_DestroyBufferObject(int bufferobject)
1577 {
1578         int i, endindex;
1579         gl_bufferobjectinfo_t *info;
1580
1581         qglDeleteBuffersARB(1, (GLuint *)&bufferobject);
1582
1583         endindex = Mem_ExpandableArray_IndexRange(&gl_state.bufferobjectinfoarray);
1584         for (i = 0;i < endindex;i++)
1585         {
1586                 info = (gl_bufferobjectinfo_t *) Mem_ExpandableArray_RecordAtIndex(&gl_state.bufferobjectinfoarray, i);
1587                 if (!info)
1588                         continue;
1589                 if (info->object == bufferobject)
1590                 {
1591                         Mem_ExpandableArray_FreeRecord(&gl_state.bufferobjectinfoarray, (void *)info);
1592                         break;
1593                 }
1594         }
1595 }
1596
1597 void GL_Mesh_ListVBOs(qboolean printeach)
1598 {
1599         int i, endindex;
1600         size_t ebocount = 0, ebomemory = 0;
1601         size_t vbocount = 0, vbomemory = 0;
1602         gl_bufferobjectinfo_t *info;
1603         endindex = Mem_ExpandableArray_IndexRange(&gl_state.bufferobjectinfoarray);
1604         for (i = 0;i < endindex;i++)
1605         {
1606                 info = (gl_bufferobjectinfo_t *) Mem_ExpandableArray_RecordAtIndex(&gl_state.bufferobjectinfoarray, i);
1607                 if (!info)
1608                         continue;
1609                 switch(info->target)
1610                 {
1611                 case GL_ELEMENT_ARRAY_BUFFER_ARB: ebocount++;ebomemory += info->size;if (printeach) Con_Printf("EBO #%i %s = %i bytes\n", info->object, info->name, (int)info->size);break;
1612                 case GL_ARRAY_BUFFER_ARB: vbocount++;vbomemory += info->size;if (printeach) Con_Printf("VBO #%i %s = %i bytes\n", info->object, info->name, (int)info->size);break;
1613                 default: Con_Printf("gl_vbostats: unknown target type %i\n", info->target);break;
1614                 }
1615         }
1616         Con_Printf("vertex buffers: %i element buffers totalling %i bytes (%.3f MB), %i vertex buffers totalling %i bytes (%.3f MB), combined %i bytes (%.3fMB)\n", (int)ebocount, (int)ebomemory, ebomemory / 1048576.0, (int)vbocount, (int)vbomemory, vbomemory / 1048576.0, (int)(ebomemory + vbomemory), (ebomemory + vbomemory) / 1048576.0);
1617 }
1618
1619 void R_Mesh_VertexPointer(const float *vertex3f, int bufferobject, size_t bufferoffset)
1620 {
1621         if (!gl_vbo.integer || gl_mesh_testarrayelement.integer)
1622                 bufferobject = 0;
1623         if (gl_state.pointer_vertex != vertex3f || gl_state.pointer_vertex_buffer != bufferobject || gl_state.pointer_vertex_offset != bufferoffset)
1624         {
1625                 gl_state.pointer_vertex = vertex3f;
1626                 gl_state.pointer_vertex_buffer = bufferobject;
1627                 gl_state.pointer_vertex_offset = bufferoffset;
1628                 CHECKGLERROR
1629                 GL_BindVBO(bufferobject);
1630                 qglVertexPointer(3, GL_FLOAT, sizeof(float[3]), bufferobject ? (void *)bufferoffset : vertex3f);CHECKGLERROR
1631         }
1632 }
1633
1634 void R_Mesh_ColorPointer(const float *color4f, int bufferobject, size_t bufferoffset)
1635 {
1636         // note: this can not rely on bufferobject to decide whether a color array
1637         // is supplied, because surfmesh_t shares one vbo for all arrays, which
1638         // means that a valid vbo may be supplied even if there is no color array.
1639         if (color4f)
1640         {
1641                 if (!gl_vbo.integer || gl_mesh_testarrayelement.integer)
1642                         bufferobject = 0;
1643                 // caller wants color array enabled
1644                 if (!gl_state.pointer_color_enabled)
1645                 {
1646                         gl_state.pointer_color_enabled = true;
1647                         CHECKGLERROR
1648                         qglEnableClientState(GL_COLOR_ARRAY);CHECKGLERROR
1649                 }
1650                 if (gl_state.pointer_color != color4f || gl_state.pointer_color_buffer != bufferobject || gl_state.pointer_color_offset != bufferoffset)
1651                 {
1652                         gl_state.pointer_color = color4f;
1653                         gl_state.pointer_color_buffer = bufferobject;
1654                         gl_state.pointer_color_offset = bufferoffset;
1655                         CHECKGLERROR
1656                         GL_BindVBO(bufferobject);
1657                         qglColorPointer(4, GL_FLOAT, sizeof(float[4]), bufferobject ? (void *)bufferoffset : color4f);CHECKGLERROR
1658                 }
1659         }
1660         else
1661         {
1662                 // caller wants color array disabled
1663                 if (gl_state.pointer_color_enabled)
1664                 {
1665                         gl_state.pointer_color_enabled = false;
1666                         CHECKGLERROR
1667                         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
1668                         // when color array is on the glColor gets trashed, set it again
1669                         qglColor4f(gl_state.color4f[0], gl_state.color4f[1], gl_state.color4f[2], gl_state.color4f[3]);CHECKGLERROR
1670                 }
1671         }
1672 }
1673
1674 void R_Mesh_TexCoordPointer(unsigned int unitnum, unsigned int numcomponents, const float *texcoord, int bufferobject, size_t bufferoffset)
1675 {
1676         gltextureunit_t *unit = gl_state.units + unitnum;
1677         // update array settings
1678         CHECKGLERROR
1679         // note: there is no need to check bufferobject here because all cases
1680         // that involve a valid bufferobject also supply a texcoord array
1681         if (texcoord)
1682         {
1683                 if (!gl_vbo.integer || gl_mesh_testarrayelement.integer)
1684                         bufferobject = 0;
1685                 // texture array unit is enabled, enable the array
1686                 if (!unit->arrayenabled)
1687                 {
1688                         unit->arrayenabled = true;
1689                         GL_ClientActiveTexture(unitnum);
1690                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
1691                 }
1692                 // texcoord array
1693                 if (unit->pointer_texcoord != texcoord || unit->pointer_texcoord_buffer != bufferobject || unit->pointer_texcoord_offset != bufferoffset || unit->arraycomponents != numcomponents)
1694                 {
1695                         unit->pointer_texcoord = texcoord;
1696                         unit->pointer_texcoord_buffer = bufferobject;
1697                         unit->pointer_texcoord_offset = bufferoffset;
1698                         unit->arraycomponents = numcomponents;
1699                         GL_ClientActiveTexture(unitnum);
1700                         GL_BindVBO(bufferobject);
1701                         qglTexCoordPointer(unit->arraycomponents, GL_FLOAT, sizeof(float) * unit->arraycomponents, bufferobject ? (void *)bufferoffset : texcoord);CHECKGLERROR
1702                 }
1703         }
1704         else
1705         {
1706                 // texture array unit is disabled, disable the array
1707                 if (unit->arrayenabled)
1708                 {
1709                         unit->arrayenabled = false;
1710                         GL_ClientActiveTexture(unitnum);
1711                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
1712                 }
1713         }
1714 }
1715
1716 int R_Mesh_TexBound(unsigned int unitnum, int id)
1717 {
1718         gltextureunit_t *unit = gl_state.units + unitnum;
1719         if (unitnum >= vid.teximageunits)
1720                 return 0;
1721         if (id == GL_TEXTURE_2D)
1722                 return unit->t2d;
1723         if (id == GL_TEXTURE_3D)
1724                 return unit->t3d;
1725         if (id == GL_TEXTURE_CUBE_MAP_ARB)
1726                 return unit->tcubemap;
1727         if (id == GL_TEXTURE_RECTANGLE_ARB)
1728                 return unit->trectangle;
1729         return 0;
1730 }
1731
1732 void R_Mesh_CopyToTexture(rtexture_t *tex, int tx, int ty, int sx, int sy, int width, int height)
1733 {
1734         R_Mesh_TexBind(0, tex);
1735         GL_ActiveTexture(0);CHECKGLERROR
1736         qglCopyTexSubImage2D(GL_TEXTURE_2D, 0, tx, ty, sx, sy, width, height);CHECKGLERROR
1737 }
1738
1739 void R_Mesh_TexBind(unsigned int unitnum, rtexture_t *tex)
1740 {
1741         gltextureunit_t *unit = gl_state.units + unitnum;
1742         int tex2d, tex3d, texcubemap, texnum;
1743         if (unitnum >= vid.teximageunits)
1744                 return;
1745         switch(vid.renderpath)
1746         {
1747         case RENDERPATH_GL20:
1748         case RENDERPATH_CGGL:
1749                 if (!tex)
1750                         tex = r_texture_white;
1751                 texnum = R_GetTexture(tex);
1752                 switch(tex->gltexturetypeenum)
1753                 {
1754                 case GL_TEXTURE_2D: if (unit->t2d != texnum) {GL_ActiveTexture(unitnum);unit->t2d = texnum;qglBindTexture(GL_TEXTURE_2D, unit->t2d);CHECKGLERROR}break;
1755                 case GL_TEXTURE_3D: if (unit->t3d != texnum) {GL_ActiveTexture(unitnum);unit->t3d = texnum;qglBindTexture(GL_TEXTURE_3D, unit->t3d);CHECKGLERROR}break;
1756                 case GL_TEXTURE_CUBE_MAP_ARB: if (unit->tcubemap != texnum) {GL_ActiveTexture(unitnum);unit->tcubemap = texnum;qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);CHECKGLERROR}break;
1757                 case GL_TEXTURE_RECTANGLE_ARB: if (unit->trectangle != texnum) {GL_ActiveTexture(unitnum);unit->trectangle = texnum;qglBindTexture(GL_TEXTURE_RECTANGLE_ARB, unit->trectangle);CHECKGLERROR}break;
1758                 }
1759                 break;
1760         case RENDERPATH_GL13:
1761         case RENDERPATH_GL11:
1762                 tex2d = 0;
1763                 tex3d = 0;
1764                 texcubemap = 0;
1765                 if (tex)
1766                 {
1767                         texnum = R_GetTexture(tex);
1768                         switch(tex->gltexturetypeenum)
1769                         {
1770                         case GL_TEXTURE_2D:
1771                                 tex2d = texnum;
1772                                 break;
1773                         case GL_TEXTURE_3D:
1774                                 tex3d = texnum;
1775                                 break;
1776                         case GL_TEXTURE_CUBE_MAP_ARB:
1777                                 texcubemap = texnum;
1778                                 break;
1779                         }
1780                 }
1781                 // update 2d texture binding
1782                 if (unit->t2d != tex2d)
1783                 {
1784                         GL_ActiveTexture(unitnum);
1785                         if (tex2d)
1786                         {
1787                                 if (unit->t2d == 0)
1788                                 {
1789                                         qglEnable(GL_TEXTURE_2D);CHECKGLERROR
1790                                 }
1791                         }
1792                         else
1793                         {
1794                                 if (unit->t2d)
1795                                 {
1796                                         qglDisable(GL_TEXTURE_2D);CHECKGLERROR
1797                                 }
1798                         }
1799                         unit->t2d = tex2d;
1800                         qglBindTexture(GL_TEXTURE_2D, unit->t2d);CHECKGLERROR
1801                 }
1802                 // update 3d texture binding
1803                 if (unit->t3d != tex3d)
1804                 {
1805                         GL_ActiveTexture(unitnum);
1806                         if (tex3d)
1807                         {
1808                                 if (unit->t3d == 0)
1809                                 {
1810                                         qglEnable(GL_TEXTURE_3D);CHECKGLERROR
1811                                 }
1812                         }
1813                         else
1814                         {
1815                                 if (unit->t3d)
1816                                 {
1817                                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
1818                                 }
1819                         }
1820                         unit->t3d = tex3d;
1821                         qglBindTexture(GL_TEXTURE_3D, unit->t3d);CHECKGLERROR
1822                 }
1823                 // update cubemap texture binding
1824                 if (unit->tcubemap != texcubemap)
1825                 {
1826                         GL_ActiveTexture(unitnum);
1827                         if (texcubemap)
1828                         {
1829                                 if (unit->tcubemap == 0)
1830                                 {
1831                                         qglEnable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1832                                 }
1833                         }
1834                         else
1835                         {
1836                                 if (unit->tcubemap)
1837                                 {
1838                                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1839                                 }
1840                         }
1841                         unit->tcubemap = texcubemap;
1842                         qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);CHECKGLERROR
1843                 }
1844                 break;
1845         }
1846 }
1847
1848 void R_Mesh_TexMatrix(unsigned int unitnum, const matrix4x4_t *matrix)
1849 {
1850         gltextureunit_t *unit = gl_state.units + unitnum;
1851         if (matrix && matrix->m[3][3])
1852         {
1853                 // texmatrix specified, check if it is different
1854                 if (!unit->texmatrixenabled || memcmp(&unit->matrix, matrix, sizeof(matrix4x4_t)))
1855                 {
1856                         float glmatrix[16];
1857                         unit->texmatrixenabled = true;
1858                         unit->matrix = *matrix;
1859                         CHECKGLERROR
1860                         Matrix4x4_ToArrayFloatGL(&unit->matrix, glmatrix);
1861                         GL_ActiveTexture(unitnum);
1862                         qglMatrixMode(GL_TEXTURE);CHECKGLERROR
1863                         qglLoadMatrixf(glmatrix);CHECKGLERROR
1864                         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
1865                 }
1866         }
1867         else
1868         {
1869                 // no texmatrix specified, revert to identity
1870                 if (unit->texmatrixenabled)
1871                 {
1872                         unit->texmatrixenabled = false;
1873                         unit->matrix = identitymatrix;
1874                         CHECKGLERROR
1875                         GL_ActiveTexture(unitnum);
1876                         qglMatrixMode(GL_TEXTURE);CHECKGLERROR
1877                         qglLoadIdentity();CHECKGLERROR
1878                         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
1879                 }
1880         }
1881 }
1882
1883 void R_Mesh_TexCombine(unsigned int unitnum, int combinergb, int combinealpha, int rgbscale, int alphascale)
1884 {
1885         gltextureunit_t *unit = gl_state.units + unitnum;
1886         CHECKGLERROR
1887         switch(vid.renderpath)
1888         {
1889         case RENDERPATH_GL20:
1890         case RENDERPATH_CGGL:
1891                 // do nothing
1892                 break;
1893         case RENDERPATH_GL13:
1894                 // GL_ARB_texture_env_combine
1895                 if (!combinergb)
1896                         combinergb = GL_MODULATE;
1897                 if (!combinealpha)
1898                         combinealpha = GL_MODULATE;
1899                 if (!rgbscale)
1900                         rgbscale = 1;
1901                 if (!alphascale)
1902                         alphascale = 1;
1903                 if (combinergb != combinealpha || rgbscale != 1 || alphascale != 1)
1904                 {
1905                         if (combinergb == GL_DECAL)
1906                                 combinergb = GL_INTERPOLATE_ARB;
1907                         if (unit->combine != GL_COMBINE_ARB)
1908                         {
1909                                 unit->combine = GL_COMBINE_ARB;
1910                                 GL_ActiveTexture(unitnum);
1911                                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);CHECKGLERROR
1912                                 qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_TEXTURE);CHECKGLERROR // for GL_INTERPOLATE_ARB mode
1913                         }
1914                         if (unit->combinergb != combinergb)
1915                         {
1916                                 unit->combinergb = combinergb;
1917                                 GL_ActiveTexture(unitnum);
1918                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, unit->combinergb);CHECKGLERROR
1919                         }
1920                         if (unit->combinealpha != combinealpha)
1921                         {
1922                                 unit->combinealpha = combinealpha;
1923                                 GL_ActiveTexture(unitnum);
1924                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, unit->combinealpha);CHECKGLERROR
1925                         }
1926                         if (unit->rgbscale != rgbscale)
1927                         {
1928                                 unit->rgbscale = rgbscale;
1929                                 GL_ActiveTexture(unitnum);
1930                                 qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, unit->rgbscale);CHECKGLERROR
1931                         }
1932                         if (unit->alphascale != alphascale)
1933                         {
1934                                 unit->alphascale = alphascale;
1935                                 GL_ActiveTexture(unitnum);
1936                                 qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, unit->alphascale);CHECKGLERROR
1937                         }
1938                 }
1939                 else
1940                 {
1941                         if (unit->combine != combinergb)
1942                         {
1943                                 unit->combine = combinergb;
1944                                 GL_ActiveTexture(unitnum);
1945                                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, unit->combine);CHECKGLERROR
1946                         }
1947                 }
1948                 break;
1949         case RENDERPATH_GL11:
1950                 // normal GL texenv
1951                 if (!combinergb)
1952                         combinergb = GL_MODULATE;
1953                 if (unit->combine != combinergb)
1954                 {
1955                         unit->combine = combinergb;
1956                         GL_ActiveTexture(unitnum);
1957                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, unit->combine);CHECKGLERROR
1958                 }
1959                 break;
1960         }
1961 }
1962
1963 void R_Mesh_ResetTextureState(void)
1964 {
1965         unsigned int unitnum;
1966
1967         BACKENDACTIVECHECK
1968
1969         CHECKGLERROR
1970         switch(vid.renderpath)
1971         {
1972         case RENDERPATH_GL20:
1973         case RENDERPATH_CGGL:
1974                 for (unitnum = 0;unitnum < vid.teximageunits;unitnum++)
1975                 {
1976                         gltextureunit_t *unit = gl_state.units + unitnum;
1977                         if (unit->t2d)
1978                         {
1979                                 unit->t2d = 0;
1980                                 GL_ActiveTexture(unitnum);
1981                                 qglBindTexture(GL_TEXTURE_2D, unit->t2d);CHECKGLERROR
1982                         }
1983                         if (unit->t3d)
1984                         {
1985                                 unit->t3d = 0;
1986                                 GL_ActiveTexture(unitnum);
1987                                 qglBindTexture(GL_TEXTURE_3D, unit->t3d);CHECKGLERROR
1988                         }
1989                         if (unit->tcubemap)
1990                         {
1991                                 unit->tcubemap = 0;
1992                                 GL_ActiveTexture(unitnum);
1993                                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);CHECKGLERROR
1994                         }
1995                         if (unit->trectangle)
1996                         {
1997                                 unit->trectangle = 0;
1998                                 GL_ActiveTexture(unitnum);
1999                                 qglBindTexture(GL_TEXTURE_RECTANGLE_ARB, unit->trectangle);CHECKGLERROR
2000                         }
2001                 }
2002                 for (unitnum = 0;unitnum < vid.texarrayunits;unitnum++)
2003                 {
2004                         gltextureunit_t *unit = gl_state.units + unitnum;
2005                         if (unit->arrayenabled)
2006                         {
2007                                 unit->arrayenabled = false;
2008                                 GL_ClientActiveTexture(unitnum);
2009                                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
2010                         }
2011                 }
2012                 for (unitnum = 0;unitnum < vid.texunits;unitnum++)
2013                 {
2014                         gltextureunit_t *unit = gl_state.units + unitnum;
2015                         if (unit->texmatrixenabled)
2016                         {
2017                                 unit->texmatrixenabled = false;
2018                                 unit->matrix = identitymatrix;
2019                                 CHECKGLERROR
2020                                 GL_ActiveTexture(unitnum);
2021                                 qglMatrixMode(GL_TEXTURE);CHECKGLERROR
2022                                 qglLoadIdentity();CHECKGLERROR
2023                                 qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
2024                         }
2025                 }
2026                 break;
2027         case RENDERPATH_GL13:
2028         case RENDERPATH_GL11:
2029                 for (unitnum = 0;unitnum < vid.texunits;unitnum++)
2030                 {
2031                         gltextureunit_t *unit = gl_state.units + unitnum;
2032                         if (unit->t2d)
2033                         {
2034                                 unit->t2d = 0;
2035                                 GL_ActiveTexture(unitnum);
2036                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
2037                                 qglBindTexture(GL_TEXTURE_2D, unit->t2d);CHECKGLERROR
2038                         }
2039                         if (unit->t3d)
2040                         {
2041                                 unit->t3d = 0;
2042                                 GL_ActiveTexture(unitnum);
2043                                 qglDisable(GL_TEXTURE_3D);CHECKGLERROR
2044                                 qglBindTexture(GL_TEXTURE_3D, unit->t3d);CHECKGLERROR
2045                         }
2046                         if (unit->tcubemap)
2047                         {
2048                                 unit->tcubemap = 0;
2049                                 GL_ActiveTexture(unitnum);
2050                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
2051                                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);CHECKGLERROR
2052                         }
2053                         if (unit->trectangle)
2054                         {
2055                                 unit->trectangle = 0;
2056                                 GL_ActiveTexture(unitnum);
2057                                 qglDisable(GL_TEXTURE_RECTANGLE_ARB);CHECKGLERROR
2058                                 qglBindTexture(GL_TEXTURE_RECTANGLE_ARB, unit->trectangle);CHECKGLERROR
2059                         }
2060                         if (unit->arrayenabled)
2061                         {
2062                                 unit->arrayenabled = false;
2063                                 GL_ClientActiveTexture(unitnum);
2064                                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
2065                         }
2066                         if (unit->texmatrixenabled)
2067                         {
2068                                 unit->texmatrixenabled = false;
2069                                 unit->matrix = identitymatrix;
2070                                 CHECKGLERROR
2071                                 GL_ActiveTexture(unitnum);
2072                                 qglMatrixMode(GL_TEXTURE);CHECKGLERROR
2073                                 qglLoadIdentity();CHECKGLERROR
2074                                 qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
2075                         }
2076                         if (unit->combine != GL_MODULATE)
2077                         {
2078                                 unit->combine = GL_MODULATE;
2079                                 GL_ActiveTexture(unitnum);
2080                                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, unit->combine);CHECKGLERROR
2081                         }
2082                 }
2083                 break;
2084         }
2085 }