gl_backend.c

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