src/graphics/grgl1texture.cpp

   1 /*
   2  * Copyright (C) Volition, Inc. 1999.  All rights reserved.
   3  *
   4  * All source code herein is the property of Volition, Inc. You may not sell
   5  * or otherwise commercially exploit the source or things you created based on
   6  * the source.
   7  */
   8
   9 #include "SDL_opengl.h"
  10
  11 #include "pstypes.h"
  12 #include "2d.h"
  13 #include "gropengl.h"
  14 #include "gropenglinternal.h"
  15 #include "grgl1.h"
  16 #include "bmpman.h"
  17 #include "grinternal.h"
  18 #include "systemvars.h"
  19 #include "osregistry.h"
  20
  21
  22 static int vram_full = 0;
  23
  24 typedef struct tcache_slot_opengl {
  25         GLuint  texture_handle;
  26         float   u_scale, v_scale;
  27         int     bitmap_id;
  28         int     size;
  29         int     used_this_frame;
  30         int     time_created;
  31         ushort  w,h;
  32
  33         // sections
  34         tcache_slot_opengl      *data_sections[MAX_BMAP_SECTIONS_X][MAX_BMAP_SECTIONS_Y];
  35         tcache_slot_opengl      *parent;
  36
  37         gr_texture_source       texture_mode;
  38 } tcache_slot_opengl;
  39
  40 static void *Texture_sections = NULL;
  41 static tcache_slot_opengl *Textures = NULL;
  42
  43 static tcache_slot_opengl *GL_bound_texture;
  44
  45 static int GL_frame_count = 0;
  46 static int GL_last_bitmap_id = -1;
  47 static int GL_last_detail = -1;
  48 static int GL_last_bitmap_type = -1;
  49 static int GL_last_section_x = -1;
  50 static int GL_last_section_y = -1;
  51 static int GL_should_preload = 0;
  52
  53 extern int Gr_textures_in;
  54
  55 static gr_texture_source GL_current_texture_source = (gr_texture_source) -1;
  56
  57 static ubyte GL_xlat[256] = { 0 };
  58
  59 extern int bm_get_cache_slot( int bitmap_id, int separate_ani_frames );
  60
  61
  62 void opengl1_set_texture_state(gr_texture_source ts)
  63 {
  64         if (ts == TEXTURE_SOURCE_NONE) {
  65                 GL_bound_texture = NULL;
  66
  67                 glBindTexture(GL_TEXTURE_2D, 0);
  68                 opengl1_tcache_set(-1, -1, NULL, NULL, 0, -1, -1, 0 );
  69         } else if (GL_bound_texture &&
  70                 GL_bound_texture->texture_mode != ts) {
  71                 switch (ts) {
  72                         case TEXTURE_SOURCE_DECAL:
  73                                 glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  74                                 glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  75                                 break;
  76                         case TEXTURE_SOURCE_NO_FILTERING:
  77                                 glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  78                                 glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  79                                 break;
  80                         default:
  81                                 break;
  82                 }
  83
  84                 GL_bound_texture->texture_mode = ts;
  85         }
  86
  87         GL_current_texture_source = ts;
  88 }
  89
  90
  91 void opengl1_tcache_init()
  92 {
  93         int i, idx, s_idx;
  94
  95         if ( os_config_read_uint("Video", "PreloadTextures", 1) ) {
  96                 GL_should_preload = 1;
  97         } else {
  98                 GL_should_preload = 0;
  99         }
 100
 101         Textures = (tcache_slot_opengl *)malloc(MAX_BITMAPS*sizeof(tcache_slot_opengl));
 102         if ( !Textures )        {
 103                 exit(1);
 104         }
 105
 106         if (gr_screen.use_sections) {
 107                 Texture_sections = (tcache_slot_opengl*)malloc(MAX_BITMAPS * MAX_BMAP_SECTIONS_X * MAX_BMAP_SECTIONS_Y * sizeof(tcache_slot_opengl));
 108                 if(!Texture_sections){
 109                         exit(1);
 110                 }
 111                 memset(Texture_sections, 0, MAX_BITMAPS * MAX_BMAP_SECTIONS_X * MAX_BMAP_SECTIONS_Y * sizeof(tcache_slot_opengl));
 112         }
 113
 114         // Init the texture structures
 115         int section_count = 0;
 116         for( i=0; i<MAX_BITMAPS; i++ )  {
 117                 Textures[i].texture_handle = 0;
 118
 119                 Textures[i].bitmap_id = -1;
 120                 Textures[i].size = 0;
 121                 Textures[i].used_this_frame = 0;
 122
 123                 Textures[i].parent = NULL;
 124
 125                 // allocate sections
 126                 if (gr_screen.use_sections) {
 127                         for(idx=0; idx<MAX_BMAP_SECTIONS_X; idx++){
 128                                 for(s_idx=0; s_idx<MAX_BMAP_SECTIONS_Y; s_idx++){
 129                                         Textures[i].data_sections[idx][s_idx] = &((tcache_slot_opengl*)Texture_sections)[section_count++];
 130                                         Textures[i].data_sections[idx][s_idx]->parent = &Textures[i];
 131                                         Textures[i].data_sections[idx][s_idx]->texture_handle = 0;
 132                                         Textures[i].data_sections[idx][s_idx]->bitmap_id = -1;
 133                                         Textures[i].data_sections[idx][s_idx]->size = 0;
 134                                         Textures[i].data_sections[idx][s_idx]->used_this_frame = 0;
 135                                 }
 136                         }
 137                 } else {
 138                         for(idx=0; idx<MAX_BMAP_SECTIONS_X; idx++){
 139                                 for(s_idx=0; s_idx<MAX_BMAP_SECTIONS_Y; s_idx++){
 140                                         Textures[i].data_sections[idx][s_idx] = NULL;
 141                                 }
 142                         }
 143                 }
 144         }
 145
 146         GL_last_detail = Detail.hardware_textures;
 147         GL_last_bitmap_id = -1;
 148         GL_last_bitmap_type = -1;
 149
 150         GL_last_section_x = -1;
 151         GL_last_section_y = -1;
 152
 153         memset(GL_xlat, 0, sizeof(GL_xlat));
 154 }
 155
 156 static int opengl1_free_texture ( tcache_slot_opengl *t )
 157 {
 158         int idx, s_idx;
 159
 160
 161         // Bitmap changed!!
 162         if ( t->bitmap_id > -1 )        {
 163                 // if I, or any of my children have been used this frame, bail
 164                 if(t->used_this_frame == GL_frame_count){
 165                         return 0;
 166                 }
 167
 168                 if (gr_screen.use_sections) {
 169                         for(idx=0; idx<MAX_BMAP_SECTIONS_X; idx++){
 170                                 for(s_idx=0; s_idx<MAX_BMAP_SECTIONS_Y; s_idx++){
 171                                         if((t->data_sections[idx][s_idx] != NULL) && (t->data_sections[idx][s_idx]->used_this_frame == GL_frame_count)){
 172                                                 return 0;
 173                                         }
 174                                 }
 175                         }
 176                 }
 177
 178                 // ok, now we know its legal to free everything safely
 179                 t->texture_mode = (gr_texture_source) -1;
 180                 glDeleteTextures (1, &t->texture_handle);
 181                 t->texture_handle = 0;
 182
 183                 if ( GL_last_bitmap_id == t->bitmap_id )       {
 184                         GL_last_bitmap_id = -1;
 185                 }
 186
 187                 // if this guy has children, free them too, since the children
 188                 // actually make up his size
 189                 if (gr_screen.use_sections) {
 190                         for(idx=0; idx<MAX_BMAP_SECTIONS_X; idx++){
 191                                 for(s_idx=0; s_idx<MAX_BMAP_SECTIONS_Y; s_idx++){
 192                                         if(t->data_sections[idx][s_idx] != NULL){
 193                                                 opengl1_free_texture(t->data_sections[idx][s_idx]);
 194                                         }
 195                                 }
 196                         }
 197                 }
 198
 199                 t->bitmap_id = -1;
 200                 t->used_this_frame = 0;
 201                 Gr_textures_in -= t->size;
 202                 t->size = 0;
 203         }
 204
 205         return 1;
 206 }
 207
 208 void opengl1_tcache_flush()
 209 {
 210         int i;
 211
 212         for( i=0; i<MAX_BITMAPS; i++ )  {
 213                 opengl1_free_texture ( &Textures[i] );
 214         }
 215         if (Gr_textures_in != 0) {
 216                 mprintf(( "WARNING: VRAM is at %d instead of zero after flushing!\n", Gr_textures_in ));
 217                 Gr_textures_in = 0;
 218         }
 219
 220         GL_last_bitmap_id = -1;
 221         GL_last_section_x = -1;
 222         GL_last_section_y = -1;
 223 }
 224
 225 void opengl1_tcache_cleanup()
 226 {
 227         opengl1_tcache_flush ();
 228
 229         if ( Textures ) {
 230                 free(Textures);
 231                 Textures = NULL;
 232         }
 233
 234         if( Texture_sections != NULL ){
 235                 free(Texture_sections);
 236                 Texture_sections = NULL;
 237         }
 238 }
 239
 240 void opengl1_tcache_frame()
 241 {
 242         GL_last_bitmap_id = -1;
 243
 244         GL_frame_count++;
 245
 246         /*
 247         int idx, s_idx;
 248         int i;
 249         for( i=0; i<MAX_BITMAPS; i++ )  {
 250                 Textures[i].used_this_frame = 0;
 251
 252                 // data sections
 253                 if(Textures[i].data_sections[0][0] != NULL){
 254                         SDL_assert(GL_texture_sections);
 255                         if(GL_texture_sections){
 256                                 for(idx=0; idx<MAX_BMAP_SECTIONS_X; idx++){
 257                                         for(s_idx=0; s_idx<MAX_BMAP_SECTIONS_Y; s_idx++){
 258                                                 if(Textures[i].data_sections[idx][s_idx] != NULL){
 259                                                         Textures[i].data_sections[idx][s_idx]->used_this_frame = 0;
 260                                                 }
 261                                         }
 262                                 }
 263                         }
 264                 }
 265         }
 266         */
 267
 268         if ( vram_full )        {
 269                 opengl1_tcache_flush();
 270                 vram_full = 0;
 271         }
 272 }
 273
 274 static void opengl1_tcache_get_adjusted_texture_size(int w_in, int h_in, int *w_out, int *h_out)
 275 {
 276         int tex_w, tex_h;
 277         int i;
 278
 279         // bogus
 280         if((w_out == NULL) ||  (h_out == NULL)){
 281                 return;
 282         }
 283
 284         // starting size
 285         tex_w = w_in;
 286         tex_h = h_in;
 287
 288         // set height and width to a power of 2
 289         for (i=0; i<16; i++ )   {
 290                 if ( (tex_w > (1<<i)) && (tex_w <= (1<<(i+1))) )        {
 291                         tex_w = 1 << (i+1);
 292                         break;
 293                 }
 294         }
 295
 296         for (i=0; i<16; i++ )   {
 297                 if ( (tex_h > (1<<i)) && (tex_h <= (1<<(i+1))) )        {
 298                         tex_h = 1 << (i+1);
 299                         break;
 300                 }
 301         }
 302
 303         // try to keep an 8:1 size ratio
 304         if (tex_w/tex_h > 8)
 305                 tex_h = tex_w/8;
 306         if (tex_h/tex_w > 8)
 307                 tex_w = tex_h/8;
 308
 309         if ( tex_w < GL_min_texture_width ) {
 310                 tex_w = GL_min_texture_width;
 311         } else if ( tex_w > GL_max_texture_width )     {
 312                 tex_w = GL_max_texture_width;
 313         }
 314
 315         if ( tex_h < GL_min_texture_height ) {
 316                 tex_h = GL_min_texture_height;
 317         } else if ( tex_h > GL_max_texture_height )    {
 318                 tex_h = GL_max_texture_height;
 319         }
 320
 321         // store the outgoing size
 322         *w_out = tex_w;
 323         *h_out = tex_h;
 324 }
 325
 326 // bmp == bitmap structure with w, h, and data
 327 // sx == x offset into bitmap
 328 // sy == y offset into bitmap
 329 // src_w == absolute width of section on source bitmap
 330 // src_h == absolute height of section on source bitmap
 331 // bmap_w == width of source bitmap
 332 // bmap_h == height of source bitmap
 333 // tex_w == width of final texture
 334 // tex_h == height of final texture
 335 static int opengl1_create_texture_sub(int bitmap_handle, int bitmap_type, bitmap *bmp, tcache_slot_opengl *t, int sx, int sy, int src_w, int src_h, int tex_w, int tex_h, bool reload, bool resize, int fail_on_full)
 336 {
 337         // bogus
 338         if ( (bmp == NULL) || (t == NULL) ) {
 339                 return 0;
 340         }
 341
 342         if (t->used_this_frame == GL_frame_count) {
 343                 mprintf(("ARGHH!!! Texture already used this frame! Cannot free it!\n"));
 344                 return 0;
 345         }
 346
 347         if ( !reload ) {
 348                 if ( !opengl1_free_texture(t) ) {
 349                         return 0;
 350                 }
 351
 352                 glGenTextures(1, &t->texture_handle);
 353
 354                 if ( !t->texture_handle ) {
 355                         nprintf(("Error", "!!DEBUG!! t->texture_handle == 0"));
 356                         return 0;
 357                 }
 358         }
 359
 360         switch (bitmap_type) {
 361                 case TCACHE_TYPE_AABITMAP:
 362                         t->u_scale = (float)bmp->w / (float)tex_w;
 363                         t->v_scale = (float)bmp->h / (float)tex_h;
 364                         break;
 365
 366                 case TCACHE_TYPE_BITMAP_INTERFACE:
 367                 case TCACHE_TYPE_BITMAP_SECTION:
 368                         t->u_scale = (float)src_w / (float)tex_w;
 369                         t->v_scale = (float)src_h / (float)tex_h;
 370                         break;
 371
 372                 default:
 373                         t->u_scale = 1.0f;
 374                         t->v_scale = 1.0f;
 375                         break;
 376         }
 377
 378         t->texture_mode = TEXTURE_SOURCE_NO_FILTERING;
 379
 380         glBindTexture(GL_TEXTURE_2D, t->texture_handle);
 381
 382         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
 383         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
 384
 385         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 386         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 387
 388         glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 389
 390         ubyte *bmp_data = (ubyte*)bmp->data;
 391         ubyte *texmem = NULL, *texmemp;
 392         int i, j;
 393         int size = 0;
 394
 395         switch (bitmap_type) {
 396                 case TCACHE_TYPE_AABITMAP: {
 397                         texmem = (ubyte *) malloc(tex_w * tex_h);
 398                         texmemp = texmem;
 399
 400                         for (i = 0; i < tex_h; i++) {
 401                                 for (j = 0;j < tex_w; j++) {
 402                                         if ( (i < bmp->h) && (j < bmp->w) ) {
 403                                                 *texmemp++ = GL_xlat[bmp_data[i*bmp->w+j]];
 404                                         } else {
 405                                                 *texmemp++ = 0;
 406                                         }
 407                                 }
 408                         }
 409
 410                         size = tex_w * tex_h;
 411
 412                         if (reload) {
 413                                 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, tex_w, tex_h, GL_ALPHA, GL_UNSIGNED_BYTE, texmem);
 414                         } else {
 415                                 glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, tex_w, tex_h, 0, GL_ALPHA, GL_UNSIGNED_BYTE, texmem);
 416                         }
 417
 418                         free (texmem);
 419
 420                         break;
 421                 }
 422
 423                 case TCACHE_TYPE_BITMAP_INTERFACE:
 424                 case TCACHE_TYPE_BITMAP_SECTION: {
 425                         // if we aren't resizing in any way then we can just use bmp_data directly
 426                         if (resize) {
 427                                 texmem = (ubyte *) malloc(tex_w * tex_h * 2);
 428                                 texmemp = texmem;
 429
 430                                 for (i = 0;i < tex_h; i++) {
 431                                         for (j = 0; j < tex_w; j++) {
 432                                                 if ( (i < src_h) && (j < src_w) ) {
 433                                                         *texmemp++ = bmp_data[((i+sy)*bmp->w+(j+sx))*2+0];
 434                                                         *texmemp++ = bmp_data[((i+sy)*bmp->w+(j+sx))*2+1];
 435                                                 } else {
 436                                                         *texmemp++ = 0;
 437                                                         *texmemp++ = 0;
 438                                                 }
 439                                         }
 440                                 }
 441                         }
 442
 443                         size = tex_w * tex_h * 2;
 444
 445                         if (reload) {
 446                                 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, tex_w, tex_h, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1, (resize) ? texmem : bmp_data);
 447                         } else {
 448                                 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, tex_w, tex_h, 0, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1, (resize) ? texmem : bmp_data);
 449                         }
 450
 451                         if (texmem) {
 452                                 free(texmem);
 453                         }
 454
 455                         break;
 456                 }
 457
 458                 default: {
 459                         // if we aren't resizing then we can just use bmp_data directly
 460                         if (resize) {
 461                                 texmem = (ubyte *) malloc (tex_w * tex_h * 2);
 462                                 texmemp = texmem;
 463
 464                                 SDL_assert(texmem);
 465
 466                                 fix u = 0, utmp, v = 0, du, dv;
 467
 468                                 du = ((bmp->w - 1) * F1_0) / tex_w;
 469                                 dv = ((bmp->h - 1) * F1_0) / tex_h;
 470
 471                                 for (j = 0; j < tex_h; j++) {
 472                                         utmp = u;
 473
 474                                         for (i = 0; i < tex_w; i++) {
 475                                                 *texmemp++ = bmp_data[(f2i(v)*bmp->w+f2i(utmp))*2+0];
 476                                                 *texmemp++ = bmp_data[(f2i(v)*bmp->w+f2i(utmp))*2+1];
 477
 478                                                 utmp += du;
 479                                         }
 480
 481                                         v += dv;
 482                                 }
 483                         }
 484
 485                         size = tex_w * tex_h * 2;
 486
 487                         if (reload) {
 488                                 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, tex_w, tex_h, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1, (resize) ? texmem : bmp_data);
 489                         } else {
 490                                 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, tex_w, tex_h, 0, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1, (resize) ? texmem : bmp_data);
 491                         }
 492
 493                         if (texmem) {
 494                                 free(texmem);
 495                         }
 496
 497                         break;
 498                 }
 499         }
 500
 501         t->bitmap_id = bitmap_handle;
 502         t->time_created = GL_frame_count;
 503         t->used_this_frame = 0;
 504         t->size = size;
 505         t->w = (ushort)tex_w;
 506         t->h = (ushort)tex_h;
 507
 508         if (!reload) {
 509                 Gr_textures_in += t->size;
 510         }
 511
 512         return 1;
 513 }
 514
 515 static int opengl1_create_texture(int bitmap_handle, int bitmap_type, tcache_slot_opengl *tslot, int fail_on_full)
 516 {
 517         ubyte flags = 0;
 518         int final_w, final_h;
 519         ubyte bpp = 16;
 520         bool resize = false;
 521         bool cull_size = false;
 522
 523         // setup texture/bitmap flags
 524         switch(bitmap_type){
 525                 case TCACHE_TYPE_AABITMAP:
 526                         flags |= BMP_AABITMAP;
 527                         bpp = 8;
 528                         break;
 529                 case TCACHE_TYPE_NORMAL:
 530                         flags |= BMP_TEX_OTHER;
 531                         cull_size = true;
 532                         break;
 533                 case TCACHE_TYPE_BITMAP_INTERFACE:
 534                 case TCACHE_TYPE_XPARENT:
 535                         flags |= BMP_TEX_XPARENT;
 536                         break;
 537                 default:
 538                         Int3();
 539                         return 0;
 540         }
 541
 542         // lock the bitmap into the proper format
 543         bitmap *bmp = bm_lock(bitmap_handle, bpp, flags);
 544         if ( bmp == NULL ) {
 545                 mprintf(("Couldn't lock bitmap %d.\n", bitmap_handle ));
 546                 return 0;
 547         }
 548
 549         int max_w = bmp->w;
 550         int max_h = bmp->h;
 551
 552         if ( cull_size && (Detail.hardware_textures < 4) ) {
 553                 // if we are going to cull the size then we need to force a resize
 554                 resize = true;
 555
 556                 // Detail.hardware_textures goes form 0 to 4
 557                 int val = 16 >> Detail.hardware_textures;
 558
 559                 max_w /= val;
 560                 max_h /= val;
 561         }
 562
 563         // get final texture size as it will be allocated as a DD surface
 564         opengl1_tcache_get_adjusted_texture_size(max_w, max_h, &final_w, &final_h);
 565
 566         if ( (final_w < 1) || (final_h < 1) ) {
 567                 mprintf(("Bitmap is too small at %dx%d.\n", final_w, final_h));
 568                 return 0;
 569         }
 570
 571         // if we don't have to resize the image (to get power of 2, etc.) then skip that extra work
 572         if ( (max_w != final_w) || (max_h != final_h) ) {
 573                 resize = true;
 574         }
 575
 576         bool reload = false;
 577
 578         // see if we can reuse this slot for a new bitmap
 579         if ( tslot->texture_handle && (tslot->bitmap_id != bitmap_handle) ) {
 580                 if ( (final_w == tslot->w) && (final_h == tslot->h) ) {
 581                         reload = true;
 582                 }
 583         }
 584
 585         // call the helper
 586         int ret_val = opengl1_create_texture_sub(bitmap_handle, bitmap_type, bmp, tslot, 0, 0, bmp->w, bmp->h, final_w, final_h, reload, resize, fail_on_full);
 587
 588         // unlock the bitmap
 589         bm_unlock(bitmap_handle);
 590
 591         return ret_val;
 592 }
 593
 594 static int opengl1_create_texture_sectioned(int bitmap_handle, int bitmap_type, tcache_slot_opengl *tslot, int sx, int sy, int fail_on_full)
 595 {
 596         int final_w, final_h;
 597         int section_x, section_y;
 598         bool resize = true;
 599
 600         SDL_assert( gr_screen.use_sections );
 601
 602         // setup texture/bitmap flags
 603         SDL_assert(bitmap_type == TCACHE_TYPE_BITMAP_SECTION);
 604         if(bitmap_type != TCACHE_TYPE_BITMAP_SECTION){
 605                 bitmap_type = TCACHE_TYPE_BITMAP_SECTION;
 606         }
 607
 608         // lock the bitmap in the proper format
 609         bitmap *bmp = bm_lock(bitmap_handle, 16, BMP_TEX_XPARENT);
 610         if ( bmp == NULL ) {
 611                 mprintf(("Couldn't lock bitmap %d.\n", bitmap_handle ));
 612                 return 0;
 613         }
 614         // determine the width and height of this section
 615         bm_get_section_size(bitmap_handle, sx, sy, &section_x, &section_y);
 616
 617         // get final texture size as it will be allocated as an opengl texture
 618         opengl1_tcache_get_adjusted_texture_size(section_x, section_y, &final_w, &final_h);
 619
 620         if ( (final_w < 1) || (final_h < 1) ) {
 621                 mprintf(("Bitmap is too small at %dx%d.\n", final_w, final_h));
 622                 return 0;
 623         }
 624
 625         // if we don't have to resize the image (to get power of 2, etc.) then skip that extra work
 626         if ( (bmp->sections.num_x == 1) && (bmp->sections.num_y == 1) && (section_x == final_w) && (section_y == final_h) ) {
 627                 resize = false;
 628         }
 629
 630         bool reload = false;
 631
 632         // see if we can reuse this slot for a new bitmap
 633         if ( tslot->texture_handle && (tslot->bitmap_id != bitmap_handle) ) {
 634                 if ( (final_w == tslot->w) && (final_h == tslot->h) ) {
 635                         reload = true;
 636                 }
 637         }
 638
 639         // call the helper
 640         int ret_val = opengl1_create_texture_sub(bitmap_handle, bitmap_type, bmp, tslot, bmp->sections.sx[sx], bmp->sections.sy[sy], section_x, section_y, final_w, final_h, reload, resize, fail_on_full);
 641
 642         // unlock the bitmap
 643         bm_unlock(bitmap_handle);
 644
 645         return ret_val;
 646 }
 647
 648 int opengl1_tcache_set(int bitmap_id, int bitmap_type, float *u_scale, float *v_scale, int fail_on_full, int sx, int sy, int force)
 649 {
 650         bitmap *bmp = NULL;
 651
 652         int idx, s_idx;
 653         int ret_val = 1;
 654
 655         if (bitmap_id < 0)
 656         {
 657                 GL_last_bitmap_id = -1;
 658                 return 0;
 659         }
 660
 661         if ( GL_last_detail != Detail.hardware_textures )      {
 662                 GL_last_detail = Detail.hardware_textures;
 663                 opengl1_tcache_flush();
 664         }
 665
 666         if (vram_full) {
 667                 return 0;
 668         }
 669
 670         int n = bm_get_cache_slot (bitmap_id, 1);
 671         tcache_slot_opengl *t = &Textures[n];
 672
 673         if ( (GL_last_bitmap_id == bitmap_id) && (GL_last_bitmap_type==bitmap_type) && (t->bitmap_id == bitmap_id) && (GL_last_section_x == sx) && (GL_last_section_y == sy))       {
 674                 t->used_this_frame = GL_frame_count;
 675
 676                 // mark all children as used
 677                 if (gr_screen.use_sections) {
 678                         for(idx=0; idx<MAX_BMAP_SECTIONS_X; idx++){
 679                                 for(s_idx=0; s_idx<MAX_BMAP_SECTIONS_Y; s_idx++){
 680                                         if(t->data_sections[idx][s_idx] != NULL){
 681                                                 t->data_sections[idx][s_idx]->used_this_frame = GL_frame_count;
 682                                         }
 683                                 }
 684                         }
 685                 }
 686
 687                 *u_scale = t->u_scale;
 688                 *v_scale = t->v_scale;
 689                 return 1;
 690         }
 691
 692         if (bitmap_type == TCACHE_TYPE_BITMAP_SECTION){
 693                 SDL_assert( gr_screen.use_sections );
 694                 SDL_assert((sx >= 0) && (sy >= 0) && (sx < MAX_BMAP_SECTIONS_X) && (sy < MAX_BMAP_SECTIONS_Y));
 695                 if(!((sx >= 0) && (sy >= 0) && (sx < MAX_BMAP_SECTIONS_X) && (sy < MAX_BMAP_SECTIONS_Y))){
 696                         return 0;
 697                 }
 698
 699                 ret_val = 1;
 700
 701                 // if the texture sections haven't been created yet
 702                 if((t->bitmap_id < 0) || (t->bitmap_id != bitmap_id)){
 703
 704                         // lock the bitmap in the proper format
 705                         bmp = bm_lock(bitmap_id, 16, BMP_TEX_XPARENT);
 706                         bm_unlock(bitmap_id);
 707
 708                         // now lets do something for each texture
 709
 710                         for(idx=0; idx<bmp->sections.num_x; idx++){
 711                                 for(s_idx=0; s_idx<bmp->sections.num_y; s_idx++){
 712                                         // hmm. i'd rather we didn't have to do it this way...
 713                                         if(!opengl1_create_texture_sectioned(bitmap_id, bitmap_type, t->data_sections[idx][s_idx], idx, s_idx, fail_on_full)){
 714                                                 ret_val = 0;
 715                                         }
 716
 717                                         // not used this frame
 718                                         t->data_sections[idx][s_idx]->used_this_frame = 0;
 719                                 }
 720                         }
 721
 722                         // zero out pretty much everything in the parent struct since he's just the root
 723                         t->bitmap_id = bitmap_id;
 724                         t->texture_handle = 0;
 725                         t->time_created = t->data_sections[sx][sy]->time_created;
 726                         t->used_this_frame = 0;
 727                 }
 728
 729                 // argh. we failed to upload. free anything we can
 730                 if(!ret_val){
 731                         opengl1_free_texture(t);
 732                 }
 733                 // swap in the texture we want
 734                 else {
 735                         t = t->data_sections[sx][sy];
 736                 }
 737         }
 738         // all other "normal" textures
 739         else if((bitmap_id < 0) || (bitmap_id != t->bitmap_id)){
 740                 ret_val = opengl1_create_texture( bitmap_id, bitmap_type, t, fail_on_full );
 741         }
 742
 743         // everything went ok
 744         if(ret_val && (t->texture_handle) && !vram_full){
 745                 *u_scale = t->u_scale;
 746                 *v_scale = t->v_scale;
 747
 748                 GL_bound_texture = t;
 749
 750                 glBindTexture (GL_TEXTURE_2D, t->texture_handle );
 751
 752                 GL_last_bitmap_id = t->bitmap_id;
 753                 GL_last_bitmap_type = bitmap_type;
 754                 GL_last_section_x = sx;
 755                 GL_last_section_y = sy;
 756
 757                 t->used_this_frame = GL_frame_count;
 758         }
 759         // gah
 760         else {
 761                 GL_last_bitmap_id = -1;
 762                 GL_last_bitmap_type = -1;
 763
 764                 GL_last_section_x = -1;
 765                 GL_last_section_y = -1;
 766
 767                 GL_bound_texture = NULL;
 768
 769                 glBindTexture (GL_TEXTURE_2D, 0);       // test - DDOI
 770                 return 0;
 771         }
 772
 773         return 1;
 774 }
 775
 776 void gr_opengl1_preload_init()
 777 {
 778         opengl1_tcache_flush();
 779 }
 780
 781 int gr_opengl1_preload(int bitmap_num, int is_aabitmap)
 782 {
 783         if ( !GL_should_preload )      {
 784                 return 0;
 785         }
 786
 787         float u_scale, v_scale;
 788         int retval;
 789         int bitmap_type = TCACHE_TYPE_NORMAL;
 790
 791         if ( is_aabitmap )      {
 792                 bitmap_type = TCACHE_TYPE_AABITMAP;
 793         }
 794
 795         retval = opengl1_tcache_set(bitmap_num, bitmap_type, &u_scale, &v_scale, 1, -1, -1, 0 );
 796
 797         if ( !retval )  {
 798                 mprintf(("Texture upload failed!\n" ));
 799         }
 800
 801         return retval;
 802 }
 803
 804 void gr_opengl1_set_gamma(float)
 805 {
 806         int i;
 807
 808         // set the alpha gamma settings (for fonts)
 809         for (i = 0; i < 16; i++) {
 810                 GL_xlat[i] = (ubyte)Gr_gamma_lookup[(i*255)/15];
 811         }
 812
 813         GL_xlat[15] = GL_xlat[1];
 814
 815         // Flush any existing textures
 816         opengl1_tcache_flush();
 817 }
 818
 819 void gr_opengl1_release_texture(int handle)
 820 {
 821         for(int i=0; i<MAX_BITMAPS; i++ )  {
 822                 if (Textures[i].bitmap_id == handle) {
 823                         Textures[i].used_this_frame = 0; // this bmp doesn't even exist any longer...
 824                         opengl1_free_texture( &Textures[i] );
 825                 }
 826         }
 827 }