added GL_DepthRange function and MATERIALFLAG_SHORTDEPTHRANGE (now used by viewmodels...

[xonotic/darkplaces.git] / gl_backend.c

diff --git a/gl_backend.c b/gl_backend.c
index cb2f2feaf9edc6dc9e1ee2272ad440ad408f6298..93d23b774ddbbc94b58ac72b958b875381f2f845 100644 (file)
--- a/gl_backend.c
+++ b/gl_backend.c
@@ -14,6 +14,7 @@ cvar_t gl_polyblend = {CVAR_SAVE, "gl_polyblend", "1", "tints view while underwa
 cvar_t gl_dither = {CVAR_SAVE, "gl_dither", "1", "enables OpenGL dithering (16bit looks bad with this off)"};
 cvar_t gl_lockarrays = {0, "gl_lockarrays", "0", "enables use of glLockArraysEXT, may cause glitches with some broken drivers, and may be slower than normal"};
 cvar_t gl_lockarrays_minimumvertices = {0, "gl_lockarrays_minimumvertices", "1", "minimum number of vertices required for use of glLockArraysEXT, setting this too low may reduce performance"};
+cvar_t gl_vbo = {0, "gl_vbo", "1", "make use of GL_ARB_vertex_buffer_object extension to store static geometry in video memory for faster rendering"};
 
 int gl_maxdrawrangeelementsvertices;
 int gl_maxdrawrangeelementsindices;
@@ -229,6 +230,7 @@ void gl_backend_init(void)
        Cvar_RegisterVariable(&gl_dither);
        Cvar_RegisterVariable(&gl_lockarrays);
        Cvar_RegisterVariable(&gl_lockarrays_minimumvertices);
+       Cvar_RegisterVariable(&gl_vbo);
        Cvar_RegisterVariable(&gl_paranoid);
        Cvar_RegisterVariable(&gl_printcheckerror);
 #ifdef NORENDER
@@ -355,6 +357,7 @@ static struct gl_state_s
        GLboolean depthmask;
        int colormask; // stored as bottom 4 bits: r g b a (3 2 1 0 order)
        int depthtest;
+       float depthrange[2];
        int alphatest;
        int scissortest;
        unsigned int unit;
@@ -629,6 +632,16 @@ void GL_DepthTest(int state)
        }
 }
 
+void GL_DepthRange(float nearfrac, float farfrac)
+{
+       if (gl_state.depthrange[0] != nearfrac || gl_state.depthrange[1] != farfrac)
+       {
+               gl_state.depthrange[0] = nearfrac;
+               gl_state.depthrange[1] = farfrac;
+               qglDepthRange(nearfrac, farfrac);
+       }
+}
+
 void GL_CullFace(int state)
 {
        CHECKGLERROR
@@ -872,9 +885,11 @@ void R_Mesh_Draw(int firstvertex, int numvertices, int numtriangles, const int *
        unsigned int numelements = numtriangles * 3;
        if (numvertices < 3 || numtriangles < 1)
        {
-               Con_Printf("R_Mesh_Draw(%d, %d, %d, %8p);\n", firstvertex, numvertices, numtriangles, elements);
+               Con_Printf("R_Mesh_Draw(%d, %d, %d, %8p, %i, %p);\n", firstvertex, numvertices, numtriangles, elements, bufferobject, (void *)bufferoffset);
                return;
        }
+       if (!gl_vbo.integer)
+               bufferobject = 0;
        CHECKGLERROR
        r_refdef.stats.meshes++;
        r_refdef.stats.meshes_elements += numelements;
@@ -1084,6 +1099,8 @@ void R_Mesh_Finish(void)
 int R_Mesh_CreateStaticEBO(void *data, size_t size)
 {
        GLuint bufferobject;
+       if (!gl_vbo.integer)
+               return 0;
        qglGenBuffersARB(1, &bufferobject);
        GL_BindEBO(bufferobject);
        qglBufferDataARB(GL_ELEMENT_ARRAY_BUFFER_ARB, size, data, GL_STATIC_DRAW_ARB);
@@ -1098,6 +1115,8 @@ void R_Mesh_DestroyEBO(int bufferobject)
 int R_Mesh_CreateStaticVBO(void *data, size_t size)
 {
        GLuint bufferobject;
+       if (!gl_vbo.integer)
+               return 0;
        qglGenBuffersARB(1, &bufferobject);
        GL_BindVBO(bufferobject);
        qglBufferDataARB(GL_ARRAY_BUFFER_ARB, size, data, GL_STATIC_DRAW_ARB);
@@ -1124,6 +1143,8 @@ void R_Mesh_Matrix(const matrix4x4_t *matrix)
 
 void R_Mesh_VertexPointer(const float *vertex3f, int bufferobject, size_t bufferoffset)
 {
+       if (!gl_vbo.integer)
+               bufferobject = 0;
        if (gl_state.pointer_vertex != vertex3f || gl_state.pointer_vertex_buffer != bufferobject || gl_state.pointer_vertex_offset != bufferoffset)
        {
                gl_state.pointer_vertex = vertex3f;
@@ -1137,8 +1158,13 @@ void R_Mesh_VertexPointer(const float *vertex3f, int bufferobject, size_t buffer
 
 void R_Mesh_ColorPointer(const float *color4f, int bufferobject, size_t bufferoffset)
 {
-       if (color4f || bufferobject)
+       // note: this can not rely on bufferobject to decide whether a color array
+       // is supplied, because surfmesh_t shares one vbo for all arrays, which
+       // means that a valid vbo may be supplied even if there is no color array.
+       if (color4f)
        {
+               if (!gl_vbo.integer)
+                       bufferobject = 0;
                // caller wants color array enabled
                if (!gl_state.pointer_color_enabled)
                {
@@ -1175,8 +1201,12 @@ void R_Mesh_TexCoordPointer(unsigned int unitnum, unsigned int numcomponents, co
        gltextureunit_t *unit = gl_state.units + unitnum;
        // update array settings
        CHECKGLERROR
-       if (texcoord || bufferobject)
+       // note: there is no need to check bufferobject here because all cases
+       // that involve a valid bufferobject also supply a texcoord array
+       if (texcoord)
        {
+               if (!gl_vbo.integer)
+                       bufferobject = 0;
                // texture array unit is enabled, enable the array
                if (!unit->arrayenabled)
                {
@@ -1708,9 +1738,9 @@ void R_Mesh_TextureState(const rmeshstate_t *m)
        for (i = 0;i < backendarrayunits;i++)
        {
                if (m->pointer_texcoord3f[i])
-                       R_Mesh_TexCoordPointer(i, 3, m->pointer_texcoord3f[i], 0, 0);
+                       R_Mesh_TexCoordPointer(i, 3, m->pointer_texcoord3f[i], m->pointer_texcoord_bufferobject[i], m->pointer_texcoord_bufferoffset[i]);
                else
-                       R_Mesh_TexCoordPointer(i, 2, m->pointer_texcoord[i], 0, 0);
+                       R_Mesh_TexCoordPointer(i, 2, m->pointer_texcoord[i], m->pointer_texcoord_bufferobject[i], m->pointer_texcoord_bufferoffset[i]);
        }
        for (i = 0;i < backendunits;i++)
        {