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