gl_backend.c

   1
   2 #include "quakedef.h"
   3 #include "image.h"
   4
   5 cvar_t gl_mesh_maxverts = {0, "gl_mesh_maxverts", "21760"};
   6 cvar_t gl_mesh_floatcolors = {0, "gl_mesh_floatcolors", "1"};
   7 cvar_t gl_mesh_drawrangeelements = {0, "gl_mesh_drawrangeelements", "1"};
   8 cvar_t gl_mesh_vertex_array_range = {0, "gl_mesh_vertex_array_range", "0"};
   9 cvar_t gl_mesh_vertex_array_range_readfrequency = {0, "gl_mesh_vertex_array_range_readfrequency", "0.2"};
  10 cvar_t gl_mesh_vertex_array_range_writefrequency = {0, "gl_mesh_vertex_array_range_writefrequency", "0.2"};
  11 cvar_t gl_mesh_vertex_array_range_priority = {0, "gl_mesh_vertex_array_range_priority", "0.7"};
  12 cvar_t gl_delayfinish = {CVAR_SAVE, "gl_delayfinish", "0"};
  13
  14 cvar_t r_render = {0, "r_render", "1"};
  15 cvar_t gl_dither = {CVAR_SAVE, "gl_dither", "1"}; // whether or not to use dithering
  16 cvar_t gl_lockarrays = {0, "gl_lockarrays", "1"};
  17
  18 int gl_maxdrawrangeelementsvertices;
  19 int gl_maxdrawrangeelementsindices;
  20
  21 #ifdef DEBUGGL
  22 int errornumber = 0;
  23
  24 void GL_PrintError(int errornumber, char *filename, int linenumber)
  25 {
  26         switch(errornumber)
  27         {
  28 #ifdef GL_INVALID_ENUM
  29         case GL_INVALID_ENUM:
  30                 Con_Printf("GL_INVALID_ENUM at %s:%i\n", filename, linenumber);
  31                 break;
  32 #endif
  33 #ifdef GL_INVALID_VALUE
  34         case GL_INVALID_VALUE:
  35                 Con_Printf("GL_INVALID_VALUE at %s:%i\n", filename, linenumber);
  36                 break;
  37 #endif
  38 #ifdef GL_INVALID_OPERATION
  39         case GL_INVALID_OPERATION:
  40                 Con_Printf("GL_INVALID_OPERATION at %s:%i\n", filename, linenumber);
  41                 break;
  42 #endif
  43 #ifdef GL_STACK_OVERFLOW
  44         case GL_STACK_OVERFLOW:
  45                 Con_Printf("GL_STACK_OVERFLOW at %s:%i\n", filename, linenumber);
  46                 break;
  47 #endif
  48 #ifdef GL_STACK_UNDERFLOW
  49         case GL_STACK_UNDERFLOW:
  50                 Con_Printf("GL_STACK_UNDERFLOW at %s:%i\n", filename, linenumber);
  51                 break;
  52 #endif
  53 #ifdef GL_OUT_OF_MEMORY
  54         case GL_OUT_OF_MEMORY:
  55                 Con_Printf("GL_OUT_OF_MEMORY at %s:%i\n", filename, linenumber);
  56                 break;
  57 #endif
  58 #ifdef GL_TABLE_TOO_LARGE
  59         case GL_TABLE_TOO_LARGE:
  60                 Con_Printf("GL_TABLE_TOO_LARGE at %s:%i\n", filename, linenumber);
  61                 break;
  62 #endif
  63         default:
  64                 Con_Printf("GL UNKNOWN (%i) at %s:%i\n", errornumber, filename, linenumber);
  65                 break;
  66         }
  67 }
  68 #endif
  69
  70 #define BACKENDACTIVECHECK if (!backendactive) Sys_Error("GL backend function called when backend is not active\n");
  71
  72 int c_meshs, c_meshelements;
  73
  74 void SCR_ScreenShot_f (void);
  75
  76 // these are externally accessible
  77 int r_lightmapscalebit;
  78 float r_colorscale;
  79 GLfloat *varray_vertex3f, *varray_buf_vertex3f;
  80 GLfloat *varray_color4f, *varray_buf_color4f;
  81 GLfloat *varray_texcoord3f[MAX_TEXTUREUNITS], *varray_buf_texcoord3f[MAX_TEXTUREUNITS];
  82 GLfloat *varray_texcoord2f[MAX_TEXTUREUNITS], *varray_buf_texcoord2f[MAX_TEXTUREUNITS];
  83 static qbyte *varray_color4b, *varray_buf_color4b;
  84 int mesh_maxverts;
  85 int mesh_var;
  86 float mesh_var_readfrequency;
  87 float mesh_var_writefrequency;
  88 float mesh_var_priority;
  89 int varray_offset = 0, varray_offsetnext = 0;
  90 GLuint *varray_buf_elements3i;
  91 int mesh_maxelements = 3072;
  92
  93 static matrix4x4_t backend_viewmatrix;
  94 static matrix4x4_t backend_modelmatrix;
  95 static matrix4x4_t backend_modelviewmatrix;
  96 static matrix4x4_t backend_glmodelviewmatrix;
  97 static matrix4x4_t backend_projectmatrix;
  98
  99 static int backendunits, backendactive;
 100 static mempool_t *gl_backend_mempool;
 101
 102 /*
 103 note: here's strip order for a terrain row:
 104 0--1--2--3--4
 105 |\ |\ |\ |\ |
 106 | \| \| \| \|
 107 A--B--C--D--E
 108
 109 A0B, 01B, B1C, 12C, C2D, 23D, D3E, 34E
 110
 111 *elements++ = i + row;
 112 *elements++ = i;
 113 *elements++ = i + row + 1;
 114 *elements++ = i;
 115 *elements++ = i + 1;
 116 *elements++ = i + row + 1;
 117 */
 118
 119 void GL_Backend_AllocElementsArray(void)
 120 {
 121         if (varray_buf_elements3i)
 122                 Mem_Free(varray_buf_elements3i);
 123         varray_buf_elements3i = Mem_Alloc(gl_backend_mempool, mesh_maxelements * sizeof(GLuint));
 124 }
 125
 126 void GL_Backend_FreeElementArray(void)
 127 {
 128         if (varray_buf_elements3i)
 129                 Mem_Free(varray_buf_elements3i);
 130         varray_buf_elements3i = NULL;
 131 }
 132
 133 void GL_Backend_CheckCvars(void)
 134 {
 135         // 21760 is (65536 / 3) rounded off to a multiple of 128
 136         if (gl_mesh_maxverts.integer < 1024)
 137                 Cvar_SetValueQuick(&gl_mesh_maxverts, 1024);
 138         if (gl_mesh_maxverts.integer > 21760)
 139                 Cvar_SetValueQuick(&gl_mesh_maxverts, 21760);
 140         if (gl_mesh_vertex_array_range.integer && !gl_support_var)
 141                 Cvar_SetValueQuick(&gl_mesh_vertex_array_range, 0);
 142         if (gl_mesh_vertex_array_range_readfrequency.value < 0)
 143                 Cvar_SetValueQuick(&gl_mesh_vertex_array_range_readfrequency, 0);
 144         if (gl_mesh_vertex_array_range_readfrequency.value > 1)
 145                 Cvar_SetValueQuick(&gl_mesh_vertex_array_range_readfrequency, 1);
 146         if (gl_mesh_vertex_array_range_writefrequency.value < 0)
 147                 Cvar_SetValueQuick(&gl_mesh_vertex_array_range_writefrequency, 0);
 148         if (gl_mesh_vertex_array_range_writefrequency.value > 1)
 149                 Cvar_SetValueQuick(&gl_mesh_vertex_array_range_writefrequency, 1);
 150         if (gl_mesh_vertex_array_range_priority.value < 0)
 151                 Cvar_SetValueQuick(&gl_mesh_vertex_array_range_priority, 0);
 152         if (gl_mesh_vertex_array_range_priority.value > 1)
 153                 Cvar_SetValueQuick(&gl_mesh_vertex_array_range_priority, 1);
 154 }
 155
 156 int polygonelements[768];
 157
 158 void GL_Backend_AllocArrays(void)
 159 {
 160         int i, size;
 161         qbyte *data;
 162
 163         if (!gl_backend_mempool)
 164         {
 165                 gl_backend_mempool = Mem_AllocPool("GL_Backend");
 166                 varray_buf_vertex3f = NULL;
 167                 varray_buf_color4f = NULL;
 168                 varray_buf_color4b = NULL;
 169                 varray_buf_elements3i = NULL;
 170                 for (i = 0;i < MAX_TEXTUREUNITS;i++)
 171                         varray_buf_texcoord3f[i] = varray_buf_texcoord2f[i] = NULL;
 172         }
 173
 174         mesh_maxverts = gl_mesh_maxverts.integer;
 175         mesh_var = gl_mesh_vertex_array_range.integer;
 176         mesh_var_readfrequency = gl_mesh_vertex_array_range_readfrequency.value;
 177         mesh_var_writefrequency = gl_mesh_vertex_array_range_writefrequency.value;
 178         mesh_var_priority = gl_mesh_vertex_array_range_priority.value;
 179
 180         if (varray_buf_vertex3f)
 181                 VID_FreeVertexArrays(varray_buf_vertex3f);
 182         varray_buf_vertex3f = NULL;
 183         varray_buf_color4f = NULL;
 184         varray_buf_color4b = NULL;
 185         for (i = 0;i < MAX_TEXTUREUNITS;i++)
 186                 varray_buf_texcoord3f[i] = varray_buf_texcoord2f[i] = NULL;
 187
 188         size = mesh_maxverts * (sizeof(float[3]) + sizeof(float[4]) + sizeof(qbyte[4]) + (sizeof(float[3]) + sizeof(float[2])) * backendunits);
 189         data = VID_AllocVertexArrays(gl_backend_mempool, size, gl_mesh_vertex_array_range.integer, gl_mesh_vertex_array_range_readfrequency.value, gl_mesh_vertex_array_range_writefrequency.value, gl_mesh_vertex_array_range_priority.value);
 190         varray_buf_vertex3f = (void *)data;data += sizeof(float[3]) * mesh_maxverts;
 191         varray_buf_color4f = (void *)data;data += sizeof(float[4]) * mesh_maxverts;
 192         for (i = 0;i < backendunits;i++)
 193         {
 194                 varray_buf_texcoord3f[i] = (void *)data;data += sizeof(float[3]) * mesh_maxverts;
 195                 varray_buf_texcoord2f[i] = (void *)data;data += sizeof(float[2]) * mesh_maxverts;
 196         }
 197         for (;i < MAX_TEXTUREUNITS;i++)
 198                 varray_buf_texcoord3f[i] = varray_buf_texcoord2f[i] = NULL;
 199         varray_buf_color4b = (void *)data;data += sizeof(qbyte[4]) * mesh_maxverts;
 200
 201         GL_Backend_AllocElementsArray();
 202
 203         if (gl_support_var)
 204         {
 205                 CHECKGLERROR
 206                 qglVertexArrayRangeNV(size, varray_buf_vertex3f);
 207                 CHECKGLERROR
 208                 qglEnableClientState(GL_VERTEX_ARRAY_RANGE_NV);
 209                 CHECKGLERROR
 210         }
 211 }
 212
 213 void GL_Backend_FreeArrays(void)
 214 {
 215         int i;
 216
 217         if (gl_support_var)
 218         {
 219                 CHECKGLERROR
 220                 qglDisableClientState(GL_VERTEX_ARRAY_RANGE_NV);
 221                 CHECKGLERROR
 222         }
 223
 224         if (varray_buf_vertex3f)
 225                 VID_FreeVertexArrays(varray_buf_vertex3f);
 226         varray_buf_vertex3f = NULL;
 227         varray_buf_color4f = NULL;
 228         varray_buf_color4b = NULL;
 229         for (i = 0;i < MAX_TEXTUREUNITS;i++)
 230                 varray_buf_texcoord3f[i] = varray_buf_texcoord2f[i] = NULL;
 231         varray_buf_elements3i = NULL;
 232
 233         Mem_FreePool(&gl_backend_mempool);
 234 }
 235
 236 static void gl_backend_start(void)
 237 {
 238         GL_Backend_CheckCvars();
 239
 240         Con_Printf("OpenGL Backend started with gl_mesh_maxverts %i\n", gl_mesh_maxverts.integer);
 241         if (qglDrawRangeElements != NULL)
 242         {
 243                 CHECKGLERROR
 244                 qglGetIntegerv(GL_MAX_ELEMENTS_VERTICES, &gl_maxdrawrangeelementsvertices);
 245                 CHECKGLERROR
 246                 qglGetIntegerv(GL_MAX_ELEMENTS_INDICES, &gl_maxdrawrangeelementsindices);
 247                 CHECKGLERROR
 248                 Con_Printf("glDrawRangeElements detected (max vertices %i, max indices %i)\n", gl_maxdrawrangeelementsvertices, gl_maxdrawrangeelementsindices);
 249         }
 250         if (strstr(gl_renderer, "3Dfx"))
 251         {
 252                 Con_Printf("3Dfx driver detected, forcing gl_mesh_floatcolors to 0 to prevent crashs\n");
 253                 Cvar_SetValueQuick(&gl_mesh_floatcolors, 0);
 254         }
 255
 256         backendunits = min(MAX_TEXTUREUNITS, gl_textureunits);
 257
 258         GL_Backend_AllocArrays();
 259
 260         backendactive = true;
 261 }
 262
 263 static void gl_backend_shutdown(void)
 264 {
 265         backendunits = 0;
 266         backendactive = false;
 267
 268         Con_Printf("OpenGL Backend shutting down\n");
 269
 270         GL_Backend_FreeArrays();
 271 }
 272
 273 void GL_Backend_ResizeArrays(int numvertices)
 274 {
 275         Cvar_SetValueQuick(&gl_mesh_maxverts, numvertices);
 276         GL_Backend_CheckCvars();
 277         mesh_maxverts = gl_mesh_maxverts.integer;
 278         GL_Backend_AllocArrays();
 279 }
 280
 281 static void gl_backend_newmap(void)
 282 {
 283 }
 284
 285 void gl_backend_init(void)
 286 {
 287         int i;
 288
 289         for (i = 0;i < POLYGONELEMENTS_MAXPOINTS - 2;i++)
 290         {
 291                 polygonelements[i * 3 + 0] = 0;
 292                 polygonelements[i * 3 + 1] = i + 1;
 293                 polygonelements[i * 3 + 2] = i + 2;
 294         }
 295
 296         Cvar_RegisterVariable(&r_render);
 297         Cvar_RegisterVariable(&gl_dither);
 298         Cvar_RegisterVariable(&gl_lockarrays);
 299         Cvar_RegisterVariable(&gl_delayfinish);
 300 #ifdef NORENDER
 301         Cvar_SetValue("r_render", 0);
 302 #endif
 303
 304         Cvar_RegisterVariable(&gl_mesh_maxverts);
 305         Cvar_RegisterVariable(&gl_mesh_floatcolors);
 306         Cvar_RegisterVariable(&gl_mesh_drawrangeelements);
 307         Cvar_RegisterVariable(&gl_mesh_vertex_array_range);
 308         Cvar_RegisterVariable(&gl_mesh_vertex_array_range_readfrequency);
 309         Cvar_RegisterVariable(&gl_mesh_vertex_array_range_writefrequency);
 310         Cvar_RegisterVariable(&gl_mesh_vertex_array_range_priority);
 311         R_RegisterModule("GL_Backend", gl_backend_start, gl_backend_shutdown, gl_backend_newmap);
 312 }
 313
 314 void GL_SetupView_ViewPort (int x, int y, int width, int height)
 315 {
 316         if (!r_render.integer)
 317                 return;
 318
 319         // y is weird beause OpenGL is bottom to top, we use top to bottom
 320         qglViewport(x, vid.realheight - (y + height), width, height);
 321         CHECKGLERROR
 322 }
 323
 324 void GL_SetupView_Orientation_Identity (void)
 325 {
 326         Matrix4x4_CreateIdentity(&backend_viewmatrix);
 327         memset(&backend_modelmatrix, 0, sizeof(backend_modelmatrix));
 328 }
 329
 330 void GL_SetupView_Orientation_FromEntity (vec3_t origin, vec3_t angles)
 331 {
 332         Matrix4x4_CreateRotate(&backend_viewmatrix, -90, 1, 0, 0);
 333         Matrix4x4_ConcatRotate(&backend_viewmatrix, 90, 0, 0, 1);
 334         Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[2], 1, 0, 0);
 335         Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[0], 0, 1, 0);
 336         Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[1], 0, 0, 1);
 337         Matrix4x4_ConcatTranslate(&backend_viewmatrix, -origin[0], -origin[1], -origin[2]);
 338         memset(&backend_modelmatrix, 0, sizeof(backend_modelmatrix));
 339 }
 340
 341 void GL_SetupView_Mode_Perspective (double fovx, double fovy, double zNear, double zFar)
 342 {
 343         double xmax, ymax;
 344
 345         if (!r_render.integer)
 346                 return;
 347
 348         // set up viewpoint
 349         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 350         qglLoadIdentity();CHECKGLERROR
 351         // pyramid slopes
 352         xmax = zNear * tan(fovx * M_PI / 360.0);
 353         ymax = zNear * tan(fovy * M_PI / 360.0);
 354         // set view pyramid
 355         qglFrustum(-xmax, xmax, -ymax, ymax, zNear, zFar);CHECKGLERROR
 356         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 357         GL_SetupView_Orientation_Identity();
 358 }
 359
 360 void GL_SetupView_Mode_PerspectiveInfiniteFarClip (double fovx, double fovy, double zNear)
 361 {
 362         float nudge, m[16];
 363
 364         if (!r_render.integer)
 365                 return;
 366
 367         // set up viewpoint
 368         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 369         qglLoadIdentity();CHECKGLERROR
 370         // set view pyramid
 371         nudge = 1.0 - 1.0 / (1<<23);
 372         m[ 0] = 1.0 / tan(fovx * M_PI / 360.0);
 373         m[ 1] = 0;
 374         m[ 2] = 0;
 375         m[ 3] = 0;
 376         m[ 4] = 0;
 377         m[ 5] = 1.0 / tan(fovy * M_PI / 360.0);
 378         m[ 6] = 0;
 379         m[ 7] = 0;
 380         m[ 8] = 0;
 381         m[ 9] = 0;
 382         m[10] = -1 * nudge;
 383         m[11] = -1 * nudge;
 384         m[12] = 0;
 385         m[13] = 0;
 386         m[14] = -2 * zNear * nudge;
 387         m[15] = 0;
 388         qglLoadMatrixf(m);
 389         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 390         GL_SetupView_Orientation_Identity();
 391         backend_projectmatrix.m[0][0] = m[0];
 392         backend_projectmatrix.m[1][0] = m[1];
 393         backend_projectmatrix.m[2][0] = m[2];
 394         backend_projectmatrix.m[3][0] = m[3];
 395         backend_projectmatrix.m[0][1] = m[4];
 396         backend_projectmatrix.m[1][1] = m[5];
 397         backend_projectmatrix.m[2][1] = m[6];
 398         backend_projectmatrix.m[3][1] = m[7];
 399         backend_projectmatrix.m[0][2] = m[8];
 400         backend_projectmatrix.m[1][2] = m[9];
 401         backend_projectmatrix.m[2][2] = m[10];
 402         backend_projectmatrix.m[3][2] = m[11];
 403         backend_projectmatrix.m[0][3] = m[12];
 404         backend_projectmatrix.m[1][3] = m[13];
 405         backend_projectmatrix.m[2][3] = m[14];
 406         backend_projectmatrix.m[3][3] = m[15];
 407 }
 408
 409 void GL_SetupView_Mode_Ortho (double x1, double y1, double x2, double y2, double zNear, double zFar)
 410 {
 411         if (!r_render.integer)
 412                 return;
 413
 414         // set up viewpoint
 415         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 416         qglLoadIdentity();CHECKGLERROR
 417         qglOrtho(x1, x2, y2, y1, zNear, zFar);
 418         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 419         GL_SetupView_Orientation_Identity();
 420 }
 421
 422 typedef struct gltextureunit_s
 423 {
 424         int t1d, t2d, t3d, tcubemap;
 425         int arrayenabled, arrayis3d;
 426         float rgbscale, alphascale;
 427         int combinergb, combinealpha;
 428         // FIXME: add more combine stuff
 429 }
 430 gltextureunit_t;
 431
 432 static struct
 433 {
 434         int blendfunc1;
 435         int blendfunc2;
 436         int blend;
 437         GLboolean depthmask;
 438         int depthdisable;
 439         int unit;
 440         int clientunit;
 441         gltextureunit_t units[MAX_TEXTUREUNITS];
 442         int colorarray;
 443 }
 444 gl_state;
 445
 446 void GL_SetupTextureState(void)
 447 {
 448         int i;
 449         gltextureunit_t *unit;
 450         for (i = 0;i < backendunits;i++)
 451         {
 452                 if (qglActiveTexture)
 453                         qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 454                 if (qglClientActiveTexture)
 455                         qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 456                 unit = gl_state.units + i;
 457                 unit->t1d = 0;
 458                 unit->t2d = 0;
 459                 unit->t3d = 0;
 460                 unit->tcubemap = 0;
 461                 unit->rgbscale = 1;
 462                 unit->alphascale = 1;
 463                 unit->combinergb = GL_MODULATE;
 464                 unit->combinealpha = GL_MODULATE;
 465                 unit->arrayenabled = false;
 466                 unit->arrayis3d = false;
 467                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 468                 qglTexCoordPointer(2, GL_FLOAT, sizeof(float[2]), varray_buf_texcoord2f[i]);CHECKGLERROR
 469                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 470                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 471                 if (gl_texture3d)
 472                 {
 473                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 474                 }
 475                 if (gl_texturecubemap)
 476                 {
 477                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 478                 }
 479                 if (gl_combine.integer)
 480                 {
 481                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);CHECKGLERROR
 482                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);CHECKGLERROR
 483                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);CHECKGLERROR
 484                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 485                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 486                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 487                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 488                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);CHECKGLERROR
 489                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_MODULATE);CHECKGLERROR
 490                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);CHECKGLERROR
 491                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 492                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_ALPHA_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 493                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 494                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 495                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 496                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 497                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 498                 }
 499                 else
 500                 {
 501                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 502                 }
 503         }
 504 }
 505
 506 void GL_Backend_ResetState(void)
 507 {
 508         memset(&gl_state, 0, sizeof(gl_state));
 509         gl_state.depthdisable = false;
 510         gl_state.blendfunc1 = GL_ONE;
 511         gl_state.blendfunc2 = GL_ZERO;
 512         gl_state.blend = false;
 513         gl_state.depthmask = GL_TRUE;
 514         gl_state.colorarray = false;
 515
 516         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 517         qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 518
 519         qglEnable(GL_CULL_FACE);CHECKGLERROR
 520         qglCullFace(GL_FRONT);CHECKGLERROR
 521         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 522         qglBlendFunc(gl_state.blendfunc1, gl_state.blendfunc2);CHECKGLERROR
 523         qglDisable(GL_BLEND);CHECKGLERROR
 524         qglDepthMask(gl_state.depthmask);CHECKGLERROR
 525         qglVertexPointer(3, GL_FLOAT, sizeof(float[3]), varray_buf_vertex3f);CHECKGLERROR
 526         qglEnableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 527         if (gl_mesh_floatcolors.integer)
 528         {
 529                 qglColorPointer(4, GL_FLOAT, sizeof(float[4]), varray_buf_color4f);CHECKGLERROR
 530         }
 531         else
 532         {
 533                 qglColorPointer(4, GL_UNSIGNED_BYTE, sizeof(qbyte[4]), varray_buf_color4b);CHECKGLERROR
 534         }
 535         GL_Color(1, 1, 1, 1);
 536
 537         GL_SetupTextureState();
 538 }
 539
 540 void GL_UseColorArray(void)
 541 {
 542         if (!gl_state.colorarray)
 543         {
 544                 gl_state.colorarray = true;
 545                 qglEnableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 546         }
 547 }
 548
 549 void GL_Color(float cr, float cg, float cb, float ca)
 550 {
 551         if (gl_state.colorarray)
 552         {
 553                 gl_state.colorarray = false;
 554                 qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 555         }
 556         qglColor4f(cr, cg, cb, ca);
 557 }
 558
 559 void GL_TransformToScreen(const vec4_t in, vec4_t out)
 560 {
 561         vec4_t temp;
 562         float iw;
 563         Matrix4x4_Transform4 (&backend_viewmatrix, in, temp);
 564         Matrix4x4_Transform4 (&backend_projectmatrix, temp, out);
 565         iw = 1.0f / out[3];
 566         out[0] = r_refdef.x + (out[0] * iw + 1.0f) * r_refdef.width * 0.5f;
 567         out[1] = r_refdef.y + (out[1] * iw + 1.0f) * r_refdef.height * 0.5f;
 568         out[2] = out[2] * iw;
 569 }
 570
 571 // called at beginning of frame
 572 void R_Mesh_Start(void)
 573 {
 574         BACKENDACTIVECHECK
 575
 576         CHECKGLERROR
 577
 578         GL_Backend_CheckCvars();
 579         if (mesh_maxverts != gl_mesh_maxverts.integer
 580          || mesh_var != gl_mesh_vertex_array_range.integer
 581          || mesh_var_readfrequency != gl_mesh_vertex_array_range_readfrequency.value
 582          || mesh_var_writefrequency != gl_mesh_vertex_array_range_writefrequency.value
 583          || mesh_var_priority != gl_mesh_vertex_array_range_priority.value)
 584                 GL_Backend_ResizeArrays(gl_mesh_maxverts.integer);
 585
 586         GL_Backend_ResetState();
 587
 588         if (mesh_var)
 589         {
 590                 CHECKGLERROR
 591                 qglFlushVertexArrayRangeNV();
 592                 CHECKGLERROR
 593         }
 594         varray_offset = 0;
 595 }
 596
 597 int gl_backend_rebindtextures;
 598
 599 void GL_ConvertColorsFloatToByte(int numverts)
 600 {
 601         int i, k, total;
 602         // LordHavoc: to avoid problems with aliasing (treating memory as two
 603         // different types - exactly what this is doing), these must be volatile
 604         // (or a union)
 605         volatile int *icolor;
 606         volatile float *fcolor;
 607         GLubyte *bcolor;
 608
 609         total = numverts * 4;
 610
 611         // shift float to have 8bit fraction at base of number
 612         fcolor = varray_buf_color4f;
 613         for (i = 0;i < total;)
 614         {
 615                 fcolor[i    ] += 32768.0f;
 616                 fcolor[i + 1] += 32768.0f;
 617                 fcolor[i + 2] += 32768.0f;
 618                 fcolor[i + 3] += 32768.0f;
 619                 i += 4;
 620         }
 621
 622         // then read as integer and kill float bits...
 623         icolor = (int *)varray_buf_color4f;
 624         bcolor = varray_buf_color4b;
 625         for (i = 0;i < total;)
 626         {
 627                 k = icolor[i    ] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i    ] = (GLubyte) k;
 628                 k = icolor[i + 1] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 1] = (GLubyte) k;
 629                 k = icolor[i + 2] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 2] = (GLubyte) k;
 630                 k = icolor[i + 3] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 3] = (GLubyte) k;
 631                 i += 4;
 632         }
 633 }
 634
 635 /*
 636 // enlarges geometry buffers if they are too small
 637 void _R_Mesh_ResizeCheck(int numverts)
 638 {
 639         if (numverts > mesh_maxverts)
 640         {
 641                 BACKENDACTIVECHECK
 642                 GL_Backend_ResizeArrays(numverts + 100);
 643                 GL_Backend_ResetState();
 644         }
 645 }
 646 */
 647
 648 void GL_Backend_RenumberElements(int numelements, const int *in, int offset)
 649 {
 650         int i;
 651         for (i = 0;i < numelements;i++)
 652                 varray_buf_elements3i[i] = in[i] + offset;
 653 }
 654
 655 // gets geometry space for a mesh
 656 void R_Mesh_GetSpace(int numverts)
 657 {
 658         int i;
 659
 660         varray_offset = varray_offsetnext;
 661         if (varray_offset + numverts > mesh_maxverts)
 662                 varray_offset = 0;
 663         if (numverts > mesh_maxverts)
 664         {
 665                 BACKENDACTIVECHECK
 666                 GL_Backend_ResizeArrays(numverts + 100);
 667                 GL_Backend_ResetState();
 668                 varray_offset = 0;
 669         }
 670
 671         if (varray_offset == 0 && mesh_var)
 672         {
 673                 CHECKGLERROR
 674                 qglFlushVertexArrayRangeNV();
 675                 CHECKGLERROR
 676         }
 677
 678         // for debugging
 679         //if (!mesh_var)
 680         //      varray_offset = rand() % (mesh_maxverts - numverts);
 681
 682         varray_vertex3f = varray_buf_vertex3f + varray_offset * 3;
 683         varray_color4f = varray_buf_color4f + varray_offset * 4;
 684         varray_color4b = varray_buf_color4b + varray_offset * 4;
 685         for (i = 0;i < backendunits;i++)
 686         {
 687                 varray_texcoord3f[i] = varray_buf_texcoord3f[i] + varray_offset * 3;
 688                 varray_texcoord2f[i] = varray_buf_texcoord2f[i] + varray_offset * 2;
 689         }
 690
 691         varray_offsetnext = varray_offset + numverts;
 692 }
 693
 694 // renders the current mesh
 695 void R_Mesh_Draw(int numverts, int numtriangles, const int *elements)
 696 {
 697         int numelements;
 698         if (numtriangles == 0 || numverts == 0)
 699         {
 700                 Con_Printf("R_Mesh_Draw(%d, %d, %08p);\n", numverts, numtriangles, elements);
 701                 return;
 702         }
 703         numelements = numtriangles * 3;
 704         if (mesh_maxelements < numelements)
 705         {
 706                 mesh_maxelements = numelements;
 707                 GL_Backend_AllocElementsArray();
 708         }
 709         GL_Backend_RenumberElements(numelements, elements, varray_offset);
 710         c_meshs++;
 711         c_meshelements += numelements;
 712         if (gl_state.colorarray && !gl_mesh_floatcolors.integer)
 713                 GL_ConvertColorsFloatToByte(numverts);
 714         if (r_render.integer)
 715         {
 716                 if (gl_supportslockarrays && gl_lockarrays.integer)
 717                 {
 718                         qglLockArraysEXT(varray_offset, numverts);
 719                         CHECKGLERROR
 720                         if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
 721                         {
 722                                 qglDrawRangeElements(GL_TRIANGLES, varray_offset, varray_offset + numverts, numelements, GL_UNSIGNED_INT, (const GLuint *) varray_buf_elements3i);
 723                                 CHECKGLERROR
 724                         }
 725                         else
 726                         {
 727                                 qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_INT, (const GLuint *) varray_buf_elements3i);
 728                                 CHECKGLERROR
 729                         }
 730                         qglUnlockArraysEXT();
 731                         CHECKGLERROR
 732                 }
 733                 else
 734                 {
 735                         qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_INT, (const GLuint *) varray_buf_elements3i);
 736                         CHECKGLERROR
 737                 }
 738         }
 739 }
 740
 741 // restores backend state, used when done with 3D rendering
 742 void R_Mesh_Finish(void)
 743 {
 744         int i;
 745         BACKENDACTIVECHECK
 746         if (mesh_var)
 747         {
 748                 CHECKGLERROR
 749                 qglFlushVertexArrayRangeNV();
 750                 CHECKGLERROR
 751         }
 752         varray_offset = 0;
 753
 754         for (i = backendunits - 1;i >= 0;i--)
 755         {
 756                 if (qglActiveTexture)
 757                         qglActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 758                 if (qglClientActiveTexture)
 759                         qglClientActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 760                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 761                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 762                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 763                 if (gl_texture3d)
 764                 {
 765                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 766                 }
 767                 if (gl_texturecubemap)
 768                 {
 769                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 770                 }
 771                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 772                 if (gl_combine.integer)
 773                 {
 774                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 775                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 776                 }
 777         }
 778         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 779         qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 780
 781         qglDisable(GL_BLEND);CHECKGLERROR
 782         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 783         qglDepthMask(GL_TRUE);CHECKGLERROR
 784         qglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);CHECKGLERROR
 785 }
 786
 787 void R_Mesh_Matrix(const matrix4x4_t *matrix)
 788 {
 789         if (memcmp(matrix, &backend_modelmatrix, sizeof(matrix4x4_t)))
 790         {
 791                 backend_modelmatrix = *matrix;
 792                 Matrix4x4_Concat(&backend_modelviewmatrix, &backend_viewmatrix, matrix);
 793                 Matrix4x4_Transpose(&backend_glmodelviewmatrix, &backend_modelviewmatrix);
 794                 qglLoadMatrixf(&backend_glmodelviewmatrix.m[0][0]);
 795         }
 796 }
 797
 798 // sets up the requested state
 799 void R_Mesh_MainState(const rmeshstate_t *m)
 800 {
 801         BACKENDACTIVECHECK
 802
 803         if (gl_state.blendfunc1 != m->blendfunc1 || gl_state.blendfunc2 != m->blendfunc2)
 804         {
 805                 qglBlendFunc(gl_state.blendfunc1 = m->blendfunc1, gl_state.blendfunc2 = m->blendfunc2);CHECKGLERROR
 806                 if (gl_state.blendfunc2 == GL_ZERO)
 807                 {
 808                         if (gl_state.blendfunc1 == GL_ONE)
 809                         {
 810                                 if (gl_state.blend)
 811                                 {
 812                                         gl_state.blend = 0;
 813                                         qglDisable(GL_BLEND);CHECKGLERROR
 814                                 }
 815                         }
 816                         else
 817                         {
 818                                 if (!gl_state.blend)
 819                                 {
 820                                         gl_state.blend = 1;
 821                                         qglEnable(GL_BLEND);CHECKGLERROR
 822                                 }
 823                         }
 824                 }
 825                 else
 826                 {
 827                         if (!gl_state.blend)
 828                         {
 829                                 gl_state.blend = 1;
 830                                 qglEnable(GL_BLEND);CHECKGLERROR
 831                         }
 832                 }
 833         }
 834         if (gl_state.depthdisable != m->depthdisable)
 835         {
 836                 gl_state.depthdisable = m->depthdisable;
 837                 if (gl_state.depthdisable)
 838                         qglDisable(GL_DEPTH_TEST);
 839                 else
 840                         qglEnable(GL_DEPTH_TEST);
 841         }
 842         if (gl_state.depthmask != (m->blendfunc2 == GL_ZERO || m->depthwrite))
 843         {
 844                 qglDepthMask(gl_state.depthmask = (m->blendfunc2 == GL_ZERO || m->depthwrite));CHECKGLERROR
 845         }
 846 }
 847
 848 void R_Mesh_TextureState(const rmeshstate_t *m)
 849 {
 850         int i, combinergb, combinealpha;
 851         float scale;
 852         gltextureunit_t *unit;
 853
 854         BACKENDACTIVECHECK
 855
 856         if (gl_backend_rebindtextures)
 857         {
 858                 gl_backend_rebindtextures = false;
 859                 GL_SetupTextureState();
 860         }
 861
 862         for (i = 0;i < backendunits;i++)
 863         {
 864                 unit = gl_state.units + i;
 865                 if (unit->t1d != m->tex1d[i] || unit->t2d != m->tex[i] || unit->t3d != m->tex3d[i] || unit->tcubemap != m->texcubemap[i])
 866                 {
 867                         if (m->tex3d[i] || m->texcubemap[i])
 868                         {
 869                                 if (!unit->arrayis3d)
 870                                 {
 871                                         unit->arrayis3d = true;
 872                                         if (gl_state.clientunit != i)
 873                                         {
 874                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 875                                         }
 876                                         qglTexCoordPointer(3, GL_FLOAT, sizeof(float[3]), varray_buf_texcoord3f[i]);
 877                                 }
 878                                 if (!unit->arrayenabled)
 879                                 {
 880                                         unit->arrayenabled = true;
 881                                         if (gl_state.clientunit != i)
 882                                         {
 883                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 884                                         }
 885                                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 886                                 }
 887                         }
 888                         else if (m->tex1d[i] || m->tex[i])
 889                         {
 890                                 if (unit->arrayis3d)
 891                                 {
 892                                         unit->arrayis3d = false;
 893                                         if (gl_state.clientunit != i)
 894                                         {
 895                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 896                                         }
 897                                         qglTexCoordPointer(2, GL_FLOAT, sizeof(float[2]), varray_buf_texcoord2f[i]);
 898                                 }
 899                                 if (!unit->arrayenabled)
 900                                 {
 901                                         unit->arrayenabled = true;
 902                                         if (gl_state.clientunit != i)
 903                                         {
 904                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 905                                         }
 906                                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 907                                 }
 908                         }
 909                         else
 910                         {
 911                                 if (unit->arrayenabled)
 912                                 {
 913                                         unit->arrayenabled = false;
 914                                         if (gl_state.clientunit != i)
 915                                         {
 916                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 917                                         }
 918                                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 919                                 }
 920                         }
 921                         if (unit->t1d != m->tex1d[i])
 922                         {
 923                                 if (gl_state.unit != i)
 924                                 {
 925                                         qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 926                                 }
 927                                 if (m->tex1d[i])
 928                                 {
 929                                         if (unit->t1d == 0)
 930                                                 qglEnable(GL_TEXTURE_1D);CHECKGLERROR
 931                                 }
 932                                 else
 933                                 {
 934                                         if (unit->t1d)
 935                                                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 936                                 }
 937                                 qglBindTexture(GL_TEXTURE_1D, (unit->t1d = m->tex1d[i]));CHECKGLERROR
 938                         }
 939                         if (unit->t2d != m->tex[i])
 940                         {
 941                                 if (gl_state.unit != i)
 942                                 {
 943                                         qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 944                                 }
 945                                 if (m->tex[i])
 946                                 {
 947                                         if (unit->t2d == 0)
 948                                                 qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 949                                 }
 950                                 else
 951                                 {
 952                                         if (unit->t2d)
 953                                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 954                                 }
 955                                 qglBindTexture(GL_TEXTURE_2D, (unit->t2d = m->tex[i]));CHECKGLERROR
 956                         }
 957                         if (unit->t3d != m->tex3d[i])
 958                         {
 959                                 if (gl_state.unit != i)
 960                                 {
 961                                         qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 962                                 }
 963                                 if (m->tex3d[i])
 964                                 {
 965                                         if (unit->t3d == 0)
 966                                                 qglEnable(GL_TEXTURE_3D);CHECKGLERROR
 967                                 }
 968                                 else
 969                                 {
 970                                         if (unit->t3d)
 971                                                 qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 972                                 }
 973                                 qglBindTexture(GL_TEXTURE_3D, (unit->t3d = m->tex3d[i]));CHECKGLERROR
 974                         }
 975                         if (unit->tcubemap != m->texcubemap[i])
 976                         {
 977                                 if (gl_state.unit != i)
 978                                 {
 979                                         qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 980                                 }
 981                                 if (m->texcubemap[i])
 982                                 {
 983                                         if (unit->tcubemap == 0)
 984                                                 qglEnable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 985                                 }
 986                                 else
 987                                 {
 988                                         if (unit->tcubemap)
 989                                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 990                                 }
 991                                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, (unit->tcubemap = m->texcubemap[i]));CHECKGLERROR
 992                         }
 993                 }
 994                 combinergb = m->texcombinergb[i];
 995                 if (!combinergb)
 996                         combinergb = GL_MODULATE;
 997                 if (unit->combinergb != combinergb)
 998                 {
 999                         if (gl_state.unit != i)
1000                         {
1001                                 qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
1002                         }
1003                         unit->combinergb = combinergb;
1004                         if (gl_combine.integer)
1005                         {
1006                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, unit->combinergb);CHECKGLERROR
1007                         }
1008                         else
1009                         {
1010                                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, unit->combinergb);CHECKGLERROR
1011                         }
1012                 }
1013                 combinealpha = m->texcombinealpha[i];
1014                 if (!combinealpha)
1015                         combinealpha = GL_MODULATE;
1016                 if (unit->combinealpha != combinealpha)
1017                 {
1018                         if (gl_state.unit != i)
1019                         {
1020                                 qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
1021                         }
1022                         unit->combinealpha = combinealpha;
1023                         if (gl_combine.integer)
1024                         {
1025                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, unit->combinealpha);CHECKGLERROR
1026                         }
1027                 }
1028                 scale = max(m->texrgbscale[i], 1);
1029                 if (gl_state.units[i].rgbscale != scale)
1030                 {
1031                         if (gl_state.unit != i)
1032                         {
1033                                 qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
1034                         }
1035                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (gl_state.units[i].rgbscale = scale));CHECKGLERROR
1036                 }
1037                 scale = max(m->texalphascale[i], 1);
1038                 if (gl_state.units[i].alphascale != scale)
1039                 {
1040                         if (gl_state.unit != i)
1041                         {
1042                                 qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
1043                         }
1044                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, (gl_state.units[i].alphascale = scale));CHECKGLERROR
1045                 }
1046         }
1047 }
1048
1049 void R_Mesh_State(const rmeshstate_t *m)
1050 {
1051         R_Mesh_MainState(m);
1052         R_Mesh_TextureState(m);
1053 }
1054
1055 /*
1056 ==============================================================================
1057
1058                                                 SCREEN SHOTS
1059
1060 ==============================================================================
1061 */
1062
1063 qboolean SCR_ScreenShot(char *filename, int x, int y, int width, int height)
1064 {
1065         qboolean ret;
1066         int i, j;
1067         qbyte *buffer;
1068
1069         if (!r_render.integer)
1070                 return false;
1071
1072         buffer = Mem_Alloc(tempmempool, width*height*3);
1073         qglReadPixels (x, y, width, height, GL_RGB, GL_UNSIGNED_BYTE, buffer);
1074         CHECKGLERROR
1075
1076         // LordHavoc: compensate for v_overbrightbits when using hardware gamma
1077         if (v_hwgamma.integer)
1078         {
1079                 for (i = 0;i < width * height * 3;i++)
1080                 {
1081                         j = buffer[i] << v_overbrightbits.integer;
1082                         buffer[i] = (qbyte) (bound(0, j, 255));
1083                 }
1084         }
1085
1086         ret = Image_WriteTGARGB_preflipped(filename, width, height, buffer);
1087
1088         Mem_Free(buffer);
1089         return ret;
1090 }
1091
1092 //=============================================================================
1093
1094 void R_ClearScreen(void)
1095 {
1096         if (r_render.integer)
1097         {
1098                 // clear to black
1099                 qglClearColor(0,0,0,0);CHECKGLERROR
1100                 qglClearDepth(1);CHECKGLERROR
1101                 if (gl_stencil)
1102                 {
1103                         // LordHavoc: we use a stencil centered around 128 instead of 0,
1104                         // to avoid clamping interfering with strange shadow volume
1105                         // drawing orders
1106                         qglClearStencil(128);CHECKGLERROR
1107                 }
1108                 // clear the screen
1109                 qglClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | (gl_stencil ? GL_STENCIL_BUFFER_BIT : 0));CHECKGLERROR
1110                 // set dithering mode
1111                 if (gl_dither.integer)
1112                 {
1113                         qglEnable(GL_DITHER);CHECKGLERROR
1114                 }
1115                 else
1116                 {
1117                         qglDisable(GL_DITHER);CHECKGLERROR
1118                 }
1119         }
1120 }
1121
1122 /*
1123 ==================
1124 SCR_UpdateScreen
1125
1126 This is called every frame, and can also be called explicitly to flush
1127 text to the screen.
1128 ==================
1129 */
1130 void SCR_UpdateScreen (void)
1131 {
1132         if (gl_delayfinish.integer)
1133         {
1134                 VID_Finish ();
1135
1136                 R_TimeReport("finish");
1137         }
1138
1139         if (r_textureunits.integer > gl_textureunits)
1140                 Cvar_SetValueQuick(&r_textureunits, gl_textureunits);
1141         if (r_textureunits.integer < 1)
1142                 Cvar_SetValueQuick(&r_textureunits, 1);
1143
1144         if (gl_combine.integer && (!gl_combine_extension || r_textureunits.integer < 2))
1145                 Cvar_SetValueQuick(&gl_combine, 0);
1146
1147         // lighting scale
1148         r_colorscale = 1.0f / (float) (1 << v_overbrightbits.integer);
1149
1150         // lightmaps only
1151         r_lightmapscalebit = v_overbrightbits.integer;
1152         if (gl_combine.integer && r_textureunits.integer > 1)
1153                 r_lightmapscalebit += 2;
1154
1155         R_TimeReport("setup");
1156
1157         R_ClearScreen();
1158
1159         R_TimeReport("clear");
1160
1161         if (scr_conlines < vid.conheight && cls.signon == SIGNONS)
1162                 R_RenderView();
1163
1164         // draw 2D stuff
1165         R_DrawQueue();
1166
1167         if (gl_delayfinish.integer)
1168         {
1169                 // tell driver to commit it's partially full geometry queue to the rendering queue
1170                 // (this doesn't wait for the commands themselves to complete)
1171                 qglFlush();
1172         }
1173         else
1174         {
1175                 VID_Finish ();
1176
1177                 R_TimeReport("finish");
1178         }
1179 }
1180
1181 // utility functions
1182
1183 void R_Mesh_CopyVertex3f(const float *vertex3f, int numverts)
1184 {
1185         if (mesh_var)
1186         {
1187                 float *out = varray_vertex3f;
1188                 while (--numverts)
1189                 {
1190                         *out++ = *vertex3f++;
1191                         *out++ = *vertex3f++;
1192                         *out++ = *vertex3f++;
1193                 }
1194         }
1195         else
1196                 memcpy(varray_vertex3f, vertex3f, numverts * sizeof(float[3]));
1197 }
1198
1199 void R_Mesh_CopyTexCoord2f(int tmu, const float *texcoord2f, int numverts)
1200 {
1201         if (mesh_var)
1202         {
1203                 float *out = varray_texcoord2f[tmu];
1204                 while (--numverts)
1205                 {
1206                         *out++ = *texcoord2f++;
1207                         *out++ = *texcoord2f++;
1208                 }
1209         }
1210         else
1211                 memcpy(varray_texcoord2f[tmu], texcoord2f, numverts * sizeof(float[2]));
1212 }
1213
1214 void R_Mesh_CopyColor4f(const float *color4f, int numverts)
1215 {
1216         if (mesh_var)
1217         {
1218                 float *out = varray_color4f;
1219                 while (--numverts)
1220                 {
1221                         *out++ = *color4f++;
1222                         *out++ = *color4f++;
1223                         *out++ = *color4f++;
1224                         *out++ = *color4f++;
1225                 }
1226         }
1227         else
1228                 memcpy(varray_color4f, color4f, numverts * sizeof(float[4]));
1229 }
1230
1231