r_lightning.c

   1
   2 #include "quakedef.h"
   3 #include "image.h"
   4
   5 cvar_t r_lightningbeam_thickness = {CVAR_SAVE, "r_lightningbeam_thickness", "4", "thickness of the lightning beam effect"};
   6 cvar_t r_lightningbeam_scroll = {CVAR_SAVE, "r_lightningbeam_scroll", "5", "speed of texture scrolling on the lightning beam effect"};
   7 cvar_t r_lightningbeam_repeatdistance = {CVAR_SAVE, "r_lightningbeam_repeatdistance", "128", "how far to stretch the texture along the lightning beam effect"};
   8 cvar_t r_lightningbeam_color_red = {CVAR_SAVE, "r_lightningbeam_color_red", "1", "color of the lightning beam effect"};
   9 cvar_t r_lightningbeam_color_green = {CVAR_SAVE, "r_lightningbeam_color_green", "1", "color of the lightning beam effect"};
  10 cvar_t r_lightningbeam_color_blue = {CVAR_SAVE, "r_lightningbeam_color_blue", "1", "color of the lightning beam effect"};
  11 cvar_t r_lightningbeam_qmbtexture = {CVAR_SAVE, "r_lightningbeam_qmbtexture", "0", "load the qmb textures/particles/lightning.pcx texture instead of generating one, can look better"};
  12
  13 rtexture_t *r_lightningbeamtexture;
  14 rtexture_t *r_lightningbeamqmbtexture;
  15 rtexturepool_t *r_lightningbeamtexturepool;
  16
  17 unsigned short r_lightningbeamelements[18] = {0, 1, 2, 0, 2, 3, 4, 5, 6, 4, 6, 7, 8, 9, 10, 8, 10, 11};
  18
  19 void r_lightningbeams_start(void)
  20 {
  21         r_lightningbeamtexturepool = R_AllocTexturePool();
  22         r_lightningbeamtexture = NULL;
  23         r_lightningbeamqmbtexture = NULL;
  24 }
  25
  26 void r_lightningbeams_setupqmbtexture(void)
  27 {
  28         r_lightningbeamqmbtexture = loadtextureimage(r_lightningbeamtexturepool, "textures/particles/lightning.pcx", false, TEXF_ALPHA | TEXF_PRECACHE | TEXF_FORCELINEAR, false);
  29         if (r_lightningbeamqmbtexture == NULL)
  30                 Cvar_SetValueQuick(&r_lightningbeam_qmbtexture, false);
  31 }
  32
  33 void r_lightningbeams_setuptexture(void)
  34 {
  35 #if 0
  36 #define BEAMWIDTH 128
  37 #define BEAMHEIGHT 64
  38 #define PATHPOINTS 8
  39         int i, j, px, py, nearestpathindex, imagenumber;
  40         float particlex, particley, particlexv, particleyv, dx, dy, s, maxpathstrength;
  41         unsigned char *pixels;
  42         int *image;
  43         struct lightningpathnode_s
  44         {
  45                 float x, y, strength;
  46         }
  47         path[PATHPOINTS], temppath;
  48
  49         image = Mem_Alloc(tempmempool, BEAMWIDTH * BEAMHEIGHT * sizeof(int));
  50         pixels = Mem_Alloc(tempmempool, BEAMWIDTH * BEAMHEIGHT * sizeof(unsigned char[4]));
  51
  52         for (imagenumber = 0, maxpathstrength = 0.0339476;maxpathstrength < 0.5;imagenumber++, maxpathstrength += 0.01)
  53         {
  54                 for (i = 0;i < PATHPOINTS;i++)
  55                 {
  56                         path[i].x = lhrandom(0, 1);
  57                         path[i].y = lhrandom(0.2, 0.8);
  58                         path[i].strength = lhrandom(0, 1);
  59                 }
  60                 for (i = 0;i < PATHPOINTS;i++)
  61                 {
  62                         for (j = i + 1;j < PATHPOINTS;j++)
  63                         {
  64                                 if (path[j].x < path[i].x)
  65                                 {
  66                                         temppath = path[j];
  67                                         path[j] = path[i];
  68                                         path[i] = temppath;
  69                                 }
  70                         }
  71                 }
  72                 particlex = path[0].x;
  73                 particley = path[0].y;
  74                 particlexv = lhrandom(0, 0.02);
  75                 particlexv = lhrandom(-0.02, 0.02);
  76                 memset(image, 0, BEAMWIDTH * BEAMHEIGHT * sizeof(int));
  77                 for (i = 0;i < 65536;i++)
  78                 {
  79                         for (nearestpathindex = 0;nearestpathindex < PATHPOINTS;nearestpathindex++)
  80                                 if (path[nearestpathindex].x > particlex)
  81                                         break;
  82                         nearestpathindex %= PATHPOINTS;
  83                         dx = path[nearestpathindex].x + lhrandom(-0.01, 0.01);dx = bound(0, dx, 1) - particlex;if (dx < 0) dx += 1;
  84                         dy = path[nearestpathindex].y + lhrandom(-0.01, 0.01);dy = bound(0, dy, 1) - particley;
  85                         s = path[nearestpathindex].strength / sqrt(dx*dx+dy*dy);
  86                         particlexv = particlexv /* (1 - lhrandom(0.08, 0.12))*/ + dx * s;
  87                         particleyv = particleyv /* (1 - lhrandom(0.08, 0.12))*/ + dy * s;
  88                         particlex += particlexv * maxpathstrength;particlex -= (int) particlex;
  89                         particley += particleyv * maxpathstrength;particley = bound(0, particley, 1);
  90                         px = particlex * BEAMWIDTH;
  91                         py = particley * BEAMHEIGHT;
  92                         if (px >= 0 && py >= 0 && px < BEAMWIDTH && py < BEAMHEIGHT)
  93                                 image[py*BEAMWIDTH+px] += 16;
  94                 }
  95
  96                 for (py = 0;py < BEAMHEIGHT;py++)
  97                 {
  98                         for (px = 0;px < BEAMWIDTH;px++)
  99                         {
 100                                 pixels[(py*BEAMWIDTH+px)*4+2] = bound(0, image[py*BEAMWIDTH+px] * 1.0f, 255.0f);
 101                                 pixels[(py*BEAMWIDTH+px)*4+1] = bound(0, image[py*BEAMWIDTH+px] * 1.0f, 255.0f);
 102                                 pixels[(py*BEAMWIDTH+px)*4+0] = bound(0, image[py*BEAMWIDTH+px] * 1.0f, 255.0f);
 103                                 pixels[(py*BEAMWIDTH+px)*4+3] = 255;
 104                         }
 105                 }
 106
 107                 Image_WriteTGABGRA(va("lightningbeam%i.tga", imagenumber), BEAMWIDTH, BEAMHEIGHT, pixels);
 108         }
 109
 110         r_lightningbeamtexture = R_LoadTexture2D(r_lightningbeamtexturepool, "lightningbeam", BEAMWIDTH, BEAMHEIGHT, pixels, TEXTYPE_BGRA, TEXF_PRECACHE | TEXF_FORCELINEAR, NULL);
 111
 112         Mem_Free(pixels);
 113         Mem_Free(image);
 114 #else
 115 #define BEAMWIDTH 64
 116 #define BEAMHEIGHT 128
 117         float r, g, b, intensity, fx, width, center;
 118         int x, y;
 119         unsigned char *data, *noise1, *noise2;
 120
 121         data = (unsigned char *)Mem_Alloc(tempmempool, BEAMWIDTH * BEAMHEIGHT * 4);
 122         noise1 = (unsigned char *)Mem_Alloc(tempmempool, BEAMHEIGHT * BEAMHEIGHT);
 123         noise2 = (unsigned char *)Mem_Alloc(tempmempool, BEAMHEIGHT * BEAMHEIGHT);
 124         fractalnoise(noise1, BEAMHEIGHT, BEAMHEIGHT / 8);
 125         fractalnoise(noise2, BEAMHEIGHT, BEAMHEIGHT / 16);
 126
 127         for (y = 0;y < BEAMHEIGHT;y++)
 128         {
 129                 width = 0.15;//((noise1[y * BEAMHEIGHT] * (1.0f / 256.0f)) * 0.1f + 0.1f);
 130                 center = (noise1[y * BEAMHEIGHT + (BEAMHEIGHT / 2)] / 256.0f) * (1.0f - width * 2.0f) + width;
 131                 for (x = 0;x < BEAMWIDTH;x++, fx++)
 132                 {
 133                         fx = (((float) x / BEAMWIDTH) - center) / width;
 134                         intensity = 1.0f - sqrt(fx * fx);
 135                         if (intensity > 0)
 136                                 intensity = pow(intensity, 2) * ((noise2[y * BEAMHEIGHT + x] * (1.0f / 256.0f)) * 0.33f + 0.66f);
 137                         intensity = bound(0, intensity, 1);
 138                         r = intensity * 1.0f;
 139                         g = intensity * 1.0f;
 140                         b = intensity * 1.0f;
 141                         data[(y * BEAMWIDTH + x) * 4 + 2] = (unsigned char)(bound(0, r, 1) * 255.0f);
 142                         data[(y * BEAMWIDTH + x) * 4 + 1] = (unsigned char)(bound(0, g, 1) * 255.0f);
 143                         data[(y * BEAMWIDTH + x) * 4 + 0] = (unsigned char)(bound(0, b, 1) * 255.0f);
 144                         data[(y * BEAMWIDTH + x) * 4 + 3] = (unsigned char)255;
 145                 }
 146         }
 147
 148         r_lightningbeamtexture = R_LoadTexture2D(r_lightningbeamtexturepool, "lightningbeam", BEAMWIDTH, BEAMHEIGHT, data, TEXTYPE_BGRA, TEXF_PRECACHE | TEXF_FORCELINEAR, NULL);
 149         Mem_Free(noise1);
 150         Mem_Free(noise2);
 151         Mem_Free(data);
 152 #endif
 153 }
 154
 155 void r_lightningbeams_shutdown(void)
 156 {
 157         r_lightningbeamtexture = NULL;
 158         r_lightningbeamqmbtexture = NULL;
 159         R_FreeTexturePool(&r_lightningbeamtexturepool);
 160 }
 161
 162 void r_lightningbeams_newmap(void)
 163 {
 164 }
 165
 166 void R_LightningBeams_Init(void)
 167 {
 168         Cvar_RegisterVariable(&r_lightningbeam_thickness);
 169         Cvar_RegisterVariable(&r_lightningbeam_scroll);
 170         Cvar_RegisterVariable(&r_lightningbeam_repeatdistance);
 171         Cvar_RegisterVariable(&r_lightningbeam_color_red);
 172         Cvar_RegisterVariable(&r_lightningbeam_color_green);
 173         Cvar_RegisterVariable(&r_lightningbeam_color_blue);
 174         Cvar_RegisterVariable(&r_lightningbeam_qmbtexture);
 175         R_RegisterModule("R_LightningBeams", r_lightningbeams_start, r_lightningbeams_shutdown, r_lightningbeams_newmap);
 176 }
 177
 178 void R_CalcLightningBeamPolygonVertex3f(float *v, const float *start, const float *end, const float *offset)
 179 {
 180         // near right corner
 181         VectorAdd     (start, offset, (v + 0));
 182         // near left corner
 183         VectorSubtract(start, offset, (v + 3));
 184         // far left corner
 185         VectorSubtract(end  , offset, (v + 6));
 186         // far right corner
 187         VectorAdd     (end  , offset, (v + 9));
 188 }
 189
 190 void R_CalcLightningBeamPolygonTexCoord2f(float *tc, float t1, float t2)
 191 {
 192         if (r_lightningbeam_qmbtexture.integer)
 193         {
 194                 // near right corner
 195                 tc[0] = t1;tc[1] = 0;
 196                 // near left corner
 197                 tc[2] = t1;tc[3] = 1;
 198                 // far left corner
 199                 tc[4] = t2;tc[5] = 1;
 200                 // far right corner
 201                 tc[6] = t2;tc[7] = 0;
 202         }
 203         else
 204         {
 205                 // near right corner
 206                 tc[0] = 0;tc[1] = t1;
 207                 // near left corner
 208                 tc[2] = 1;tc[3] = t1;
 209                 // far left corner
 210                 tc[4] = 1;tc[5] = t2;
 211                 // far right corner
 212                 tc[6] = 0;tc[7] = t2;
 213         }
 214 }
 215
 216 void R_FogLightningBeam_Vertex3f_Color4f(const float *v, float *c, int numverts, float r, float g, float b, float a)
 217 {
 218         int i;
 219         float fog;
 220         for (i = 0;i < numverts;i++, v += 3, c += 4)
 221         {
 222                 fog = FogPoint_World(v);
 223                 c[0] = r * fog;
 224                 c[1] = g * fog;
 225                 c[2] = b * fog;
 226                 c[3] = a;
 227         }
 228 }
 229
 230 float beamrepeatscale;
 231
 232 void R_DrawLightningBeam_TransparentCallback(const entity_render_t *ent, const rtlight_t *rtlight, int numsurfaces, int *surfacelist)
 233 {
 234         int surfacelistindex;
 235         rmeshstate_t m;
 236         float vertex3f[12*3];
 237         float texcoord2f[12*2];
 238         float color4f[12*4];
 239         R_Mesh_Matrix(&identitymatrix);
 240         GL_BlendFunc(GL_SRC_ALPHA, GL_ONE);
 241         GL_DepthMask(false);
 242         GL_DepthRange(0, 1);
 243         GL_PolygonOffset(r_refdef.polygonfactor, r_refdef.polygonoffset);
 244         GL_DepthTest(true);
 245         GL_CullFace(GL_NONE);
 246         if (r_lightningbeam_qmbtexture.integer && r_lightningbeamqmbtexture == NULL)
 247                 r_lightningbeams_setupqmbtexture();
 248         if (!r_lightningbeam_qmbtexture.integer && r_lightningbeamtexture == NULL)
 249                 r_lightningbeams_setuptexture();
 250
 251         R_Mesh_VertexPointer(vertex3f, 0, 0);
 252         R_SetupGenericShader(true);
 253         // FIXME: fixed function path can't properly handle r_refdef.view.colorscale > 1
 254         if (r_refdef.fogenabled)
 255         {
 256                 // per vertex colors if fog is used
 257                 R_Mesh_ColorPointer(color4f, 0, 0);
 258         }
 259         else
 260         {
 261                 // solid color if fog is not used
 262                 R_Mesh_ColorPointer(NULL, 0, 0);
 263                 GL_Color(r_lightningbeam_color_red.value * r_refdef.view.colorscale, r_lightningbeam_color_green.value * r_refdef.view.colorscale, r_lightningbeam_color_blue.value * r_refdef.view.colorscale, 1);
 264         }
 265         memset(&m, 0, sizeof(m));
 266         if (r_lightningbeam_qmbtexture.integer)
 267                 m.tex[0] = R_GetTexture(r_lightningbeamqmbtexture);
 268         else
 269                 m.tex[0] = R_GetTexture(r_lightningbeamtexture);
 270         m.pointer_texcoord[0] = texcoord2f;
 271         R_Mesh_TextureState(&m);
 272
 273         for (surfacelistindex = 0;surfacelistindex < numsurfaces;surfacelistindex++)
 274         {
 275                 const beam_t *b = cl.beams + surfacelist[surfacelistindex];
 276                 vec3_t beamdir, right, up, offset, start, end;
 277                 float length, t1, t2;
 278
 279                 CL_Beam_CalculatePositions(b, start, end);
 280
 281                 // calculate beam direction (beamdir) vector and beam length
 282                 // get difference vector
 283                 VectorSubtract(end, start, beamdir);
 284                 // find length of difference vector
 285                 length = sqrt(DotProduct(beamdir, beamdir));
 286                 // calculate scale to make beamdir a unit vector (normalized)
 287                 t1 = 1.0f / length;
 288                 // scale beamdir so it is now normalized
 289                 VectorScale(beamdir, t1, beamdir);
 290
 291                 // calculate up vector such that it points toward viewer, and rotates around the beamdir
 292                 // get direction from start of beam to viewer
 293                 VectorSubtract(r_refdef.view.origin, start, up);
 294                 // remove the portion of the vector that moves along the beam
 295                 // (this leaves only a vector pointing directly away from the beam)
 296                 t1 = -DotProduct(up, beamdir);
 297                 VectorMA(up, t1, beamdir, up);
 298                 // generate right vector from forward and up, the result is unnormalized
 299                 CrossProduct(beamdir, up, right);
 300                 // now normalize the right vector and up vector
 301                 VectorNormalize(right);
 302                 VectorNormalize(up);
 303
 304                 // calculate T coordinate scrolling (start and end texcoord along the beam)
 305                 t1 = r_refdef.scene.time * -r_lightningbeam_scroll.value;// + beamrepeatscale * DotProduct(start, beamdir);
 306                 t1 = t1 - (int) t1;
 307                 t2 = t1 + beamrepeatscale * length;
 308
 309                 // the beam is 3 polygons in this configuration:
 310                 //  *   2
 311                 //   * *
 312                 // 1******
 313                 //   * *
 314                 //  *   3
 315                 // they are showing different portions of the beam texture, creating an
 316                 // illusion of a beam that appears to curl around in 3D space
 317                 // (and realize that the whole polygon assembly orients itself to face
 318                 //  the viewer)
 319
 320                 // polygon 1, verts 0-3
 321                 VectorScale(right, r_lightningbeam_thickness.value, offset);
 322                 R_CalcLightningBeamPolygonVertex3f(vertex3f + 0, start, end, offset);
 323                 // polygon 2, verts 4-7
 324                 VectorAdd(right, up, offset);
 325                 VectorScale(offset, r_lightningbeam_thickness.value * 0.70710681f, offset);
 326                 R_CalcLightningBeamPolygonVertex3f(vertex3f + 12, start, end, offset);
 327                 // polygon 3, verts 8-11
 328                 VectorSubtract(right, up, offset);
 329                 VectorScale(offset, r_lightningbeam_thickness.value * 0.70710681f, offset);
 330                 R_CalcLightningBeamPolygonVertex3f(vertex3f + 24, start, end, offset);
 331                 R_CalcLightningBeamPolygonTexCoord2f(texcoord2f + 0, t1, t2);
 332                 R_CalcLightningBeamPolygonTexCoord2f(texcoord2f + 8, t1 + 0.33, t2 + 0.33);
 333                 R_CalcLightningBeamPolygonTexCoord2f(texcoord2f + 16, t1 + 0.66, t2 + 0.66);
 334                 if (r_refdef.fogenabled)
 335                 {
 336                         // per vertex colors if fog is used
 337                         R_FogLightningBeam_Vertex3f_Color4f(vertex3f, color4f, 12, r_lightningbeam_color_red.value, r_lightningbeam_color_green.value, r_lightningbeam_color_blue.value, 1);
 338                 }
 339
 340                 // draw the 3 polygons as one batch of 6 triangles using the 12 vertices
 341                 GL_LockArrays(0, 12);
 342                 R_Mesh_Draw(0, 12, 0, 6, NULL, r_lightningbeamelements, 0, 0);
 343                 GL_LockArrays(0, 0);
 344         }
 345 }
 346
 347 extern cvar_t cl_beams_polygons;
 348 void R_DrawLightningBeams(void)
 349 {
 350         int i;
 351         beam_t *b;
 352
 353         if (!cl_beams_polygons.integer)
 354                 return;
 355
 356         beamrepeatscale = 1.0f / r_lightningbeam_repeatdistance.value;
 357         for (i = 0, b = cl.beams;i < cl.num_beams;i++, b++)
 358         {
 359                 if (b->model && b->lightning)
 360                 {
 361                         vec3_t org, start, end, dir;
 362                         vec_t dist;
 363                         CL_Beam_CalculatePositions(b, start, end);
 364                         // calculate the nearest point on the line (beam) for depth sorting
 365                         VectorSubtract(end, start, dir);
 366                         dist = (DotProduct(r_refdef.view.origin, dir) - DotProduct(start, dir)) / (DotProduct(end, dir) - DotProduct(start, dir));
 367                         dist = bound(0, dist, 1);
 368                         VectorLerp(start, dist, end, org);
 369                         // now we have the nearest point on the line, so sort with it
 370                         R_MeshQueue_AddTransparent(org, R_DrawLightningBeam_TransparentCallback, NULL, i, NULL);
 371                 }
 372         }
 373 }
 374