src/graphics/gropengl1.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 "gropengl.h"
  10 #include "gropengl1.h"
  11 #include "gropenglinternal.h"
  12 #include "2d.h"
  13 #include "mouse.h"
  14 #include "pstypes.h"
  15 #include "cfile.h"
  16 #include "bmpman.h"
  17 #include "grinternal.h"
  18
  19
  20 int OGL_fog_mode = 0;
  21
  22 static int GL_one_inited = 0;
  23
  24
  25 volatile int GL_activate = 0;
  26 volatile int GL_deactivate = 0;
  27
  28 static GLuint Gr_saved_screen_tex = 0;
  29
  30 static int Gr_opengl_mouse_saved = 0;
  31 static int Gr_opengl_mouse_saved_x = 0;
  32 static int Gr_opengl_mouse_saved_y = 0;
  33 static int Gr_opengl_mouse_saved_w = 0;
  34 static int Gr_opengl_mouse_saved_h = 0;
  35 static ubyte *Gr_opengl_mouse_saved_data = NULL;
  36
  37
  38 PFNGLSECONDARYCOLORPOINTERPROC vglSecondaryColorPointer = NULL;
  39
  40
  41 static gr_alpha_blend GL_current_alpha_blend = (gr_alpha_blend) -1;
  42 static gr_zbuffer_type GL_current_zbuffer_type = (gr_zbuffer_type) -1;
  43
  44 void opengl1_set_state(gr_texture_source ts, gr_alpha_blend ab, gr_zbuffer_type zt)
  45 {
  46         opengl1_set_texture_state(ts);
  47
  48         if (ab != GL_current_alpha_blend) {
  49                 switch (ab) {
  50                         case ALPHA_BLEND_NONE:                  // 1*SrcPixel + 0*DestPixel
  51                                 glBlendFunc(GL_ONE, GL_ZERO);
  52                                 break;
  53                         case ALPHA_BLEND_ADDITIVE:              // 1*SrcPixel + 1*DestPixel
  54                                 glBlendFunc(GL_ONE, GL_ONE);
  55                                 break;
  56                         case ALPHA_BLEND_ALPHA_ADDITIVE:        // Alpha*SrcPixel + 1*DestPixel
  57                                 glBlendFunc(GL_SRC_ALPHA, GL_ONE);
  58                                 break;
  59                         case ALPHA_BLEND_ALPHA_BLEND_ALPHA:     // Alpha*SrcPixel + (1-Alpha)*DestPixel
  60                                 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  61                                 break;
  62                         case ALPHA_BLEND_ALPHA_BLEND_SRC_COLOR: // Alpha*SrcPixel + (1-SrcPixel)*DestPixel
  63                                 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_COLOR);
  64                                 break;
  65                         default:
  66                                 break;
  67                 }
  68
  69                 GL_current_alpha_blend = ab;
  70         }
  71
  72         if (zt != GL_current_zbuffer_type) {
  73                 switch (zt) {
  74                         case ZBUFFER_TYPE_NONE:
  75                                 glDepthFunc(GL_ALWAYS);
  76                                 glDepthMask(GL_FALSE);
  77                                 break;
  78                         case ZBUFFER_TYPE_READ:
  79                                 glDepthFunc(GL_LESS);
  80                                 glDepthMask(GL_FALSE);
  81                                 break;
  82                         case ZBUFFER_TYPE_WRITE:
  83                                 glDepthFunc(GL_ALWAYS);
  84                                 glDepthMask(GL_TRUE);
  85                                 break;
  86                         case ZBUFFER_TYPE_FULL:
  87                                 glDepthFunc(GL_LESS);
  88                                 glDepthMask(GL_TRUE);
  89                                 break;
  90                         default:
  91                                 break;
  92                 }
  93
  94                 GL_current_zbuffer_type = zt;
  95         }
  96 }
  97
  98 void opengl1_cleanup()
  99 {
 100         if ( !GL_one_inited ) {
 101                 return;
 102         }
 103
 104         gr_opengl1_reset_clip();
 105         gr_opengl1_clear();
 106         gr_opengl1_flip();
 107
 108         opengl1_tcache_cleanup();
 109
 110         GL_one_inited = 0;
 111 }
 112
 113 static void opengl1_init_func_pointers()
 114 {
 115         gr_screen.gf_flip = gr_opengl1_flip;
 116         gr_screen.gf_set_clip = gr_opengl1_set_clip;
 117         gr_screen.gf_reset_clip = gr_opengl1_reset_clip;
 118         gr_screen.gf_set_font = grx_set_font;
 119
 120         gr_screen.gf_set_color = gr_opengl_set_color;
 121         gr_screen.gf_set_bitmap = gr_opengl_set_bitmap;
 122         gr_screen.gf_create_shader = gr_opengl_create_shader;
 123         gr_screen.gf_set_shader = gr_opengl_set_shader;
 124         gr_screen.gf_clear = gr_opengl1_clear;
 125
 126         gr_screen.gf_aabitmap = gr_opengl1_aabitmap;
 127         gr_screen.gf_aabitmap_ex = gr_opengl1_aabitmap_ex;
 128
 129         gr_screen.gf_rect = gr_opengl1_rect;
 130         gr_screen.gf_shade = gr_opengl1_shade;
 131         gr_screen.gf_string = gr_opengl1_string;
 132         gr_screen.gf_circle = gr_opengl1_circle;
 133
 134         gr_screen.gf_line = gr_opengl1_line;
 135         gr_screen.gf_aaline = gr_opengl1_aaline;
 136         gr_screen.gf_pixel = gr_opengl1_pixel;
 137         gr_screen.gf_scaler = gr_opengl1_scaler;
 138         gr_screen.gf_tmapper = gr_opengl1_tmapper;
 139
 140         gr_screen.gf_gradient = gr_opengl1_gradient;
 141
 142         gr_screen.gf_get_color = gr_opengl_get_color;
 143         gr_screen.gf_init_color = gr_opengl_init_color;
 144         gr_screen.gf_init_alphacolor = gr_opengl_init_alphacolor;
 145         gr_screen.gf_set_color_fast = gr_opengl_set_color_fast;
 146         gr_screen.gf_print_screen = gr_opengl1_print_screen;
 147
 148         gr_screen.gf_fade_in = gr_opengl1_fade_in;
 149         gr_screen.gf_fade_out = gr_opengl1_fade_out;
 150         gr_screen.gf_flash = gr_opengl1_flash;
 151
 152         gr_screen.gf_zbuffer_get = gr_opengl_zbuffer_get;
 153         gr_screen.gf_zbuffer_set = gr_opengl_zbuffer_set;
 154         gr_screen.gf_zbuffer_clear = gr_opengl1_zbuffer_clear;
 155
 156         gr_screen.gf_save_screen = gr_opengl1_save_screen;
 157         gr_screen.gf_restore_screen = gr_opengl1_restore_screen;
 158         gr_screen.gf_free_screen = gr_opengl1_free_screen;
 159
 160         gr_screen.gf_dump_frame_start = gr_opengl1_dump_frame_start;
 161         gr_screen.gf_dump_frame_stop = gr_opengl1_dump_frame_stop;
 162         gr_screen.gf_dump_frame = gr_opengl1_dump_frame;
 163
 164         gr_screen.gf_set_gamma = gr_opengl1_set_gamma;
 165
 166         gr_screen.gf_lock = gr_opengl1_lock;
 167         gr_screen.gf_unlock = gr_opengl1_unlock;
 168
 169         gr_screen.gf_fog_set = gr_opengl1_fog_set;
 170
 171         gr_screen.gf_get_region = gr_opengl1_get_region;
 172
 173         gr_screen.gf_set_cull = gr_opengl1_set_cull;
 174
 175         gr_screen.gf_cross_fade = gr_opengl1_cross_fade;
 176
 177         gr_screen.gf_set_clear_color = gr_opengl_set_clear_color;
 178
 179         gr_screen.gf_preload_init = gr_opengl1_preload_init;
 180         gr_screen.gf_preload = gr_opengl1_preload;
 181
 182         gr_screen.gf_zbias = gr_opengl1_zbias;
 183
 184         gr_screen.gf_force_windowed = gr_opengl_force_windowed;
 185         gr_screen.gf_force_fullscreen = gr_opengl_force_fullscreen;
 186         gr_screen.gf_set_viewport = gr_opengl_set_viewport;
 187
 188         gr_screen.gf_activate = gr_opengl1_activate;
 189 }
 190
 191 void opengl1_init()
 192 {
 193         if (GL_one_inited) {
 194                 return;
 195         }
 196
 197         /*
 198           1 = use secondary color ext
 199           2 = use opengl linear fog
 200          */
 201         OGL_fog_mode = 2;
 202
 203         // only available with OpenGL 1.2+, must get ptr for Windows
 204         vglSecondaryColorPointer = (PFNGLSECONDARYCOLORPOINTERPROC)SDL_GL_GetProcAddress("glSecondaryColorPointer");
 205
 206         if (vglSecondaryColorPointer) {
 207                 OGL_fog_mode = 1;
 208         }
 209
 210         mprintf(("  Fog mode: %s\n", (OGL_fog_mode == 1) ? "secondary color" : "linear"));
 211
 212         glShadeModel(GL_SMOOTH);
 213         glEnable(GL_DITHER);
 214         glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
 215         glHint(GL_FOG_HINT, GL_NICEST);
 216
 217         glEnable(GL_DEPTH_TEST);
 218         glEnable(GL_BLEND);
 219
 220         glEnable(GL_TEXTURE_2D);
 221
 222         glDepthRange(0.0, 1.0);
 223
 224         glPixelStorei(GL_PACK_ALIGNMENT, 1);
 225         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 226
 227         glFlush();
 228
 229         opengl1_init_func_pointers();
 230         opengl1_tcache_init();
 231
 232         gr_opengl1_clear();
 233
 234         GL_one_inited = 1;
 235 }
 236
 237 void gr_opengl1_activate(int active)
 238 {
 239         if (active) {
 240                 GL_activate++;
 241
 242                 // don't grab key/mouse if cmdline says so or if we're fullscreen
 243         //      if(!Cmdline_no_grab && !(SDL_GetVideoSurface()->flags & SDL_FULLSCREEN)) {
 244         //              SDL_WM_GrabInput(SDL_GRAB_ON);
 245         //      }
 246         } else {
 247                 GL_deactivate++;
 248
 249                 // let go of mouse/keyboard
 250         //      SDL_WM_GrabInput(SDL_GRAB_OFF);
 251         }
 252 }
 253
 254 void gr_opengl1_clear()
 255 {
 256         glClearColor(gr_screen.current_clear_color.red / 255.0,
 257                 gr_screen.current_clear_color.green / 255.0,
 258                 gr_screen.current_clear_color.blue / 255.0, 1.0);
 259
 260         glClear( GL_COLOR_BUFFER_BIT );
 261 }
 262
 263 void gr_opengl1_flip()
 264 {
 265         if ( !GL_one_inited ) {
 266                 return;
 267         }
 268
 269         gr_reset_clip();
 270
 271         mouse_eval_deltas();
 272
 273         Gr_opengl_mouse_saved = 0;
 274
 275         if ( mouse_is_visible() )       {
 276                 int mx, my;
 277
 278                 gr_reset_clip();
 279                 mouse_get_pos( &mx, &my );
 280
 281                 gr_opengl1_save_mouse_area(mx,my,32,32);
 282
 283                 if (Gr_cursor == -1) {
 284 #ifndef NDEBUG
 285                         gr_set_color(255,255,255);
 286                         gr_line(mx, my, mx+7, my + 7);
 287                         gr_line(mx, my, mx+5, my );
 288                         gr_line(mx, my, mx, my+5);
 289 #endif
 290                 } else {
 291                         gr_set_bitmap(Gr_cursor);
 292                         gr_bitmap(mx, my);
 293                 }
 294          }
 295
 296 #ifndef NDEBUG
 297         GLenum error = GL_NO_ERROR;
 298
 299         do {
 300                 error = glGetError();
 301
 302                 if (error != GL_NO_ERROR) {
 303                         nprintf(("Warning", "!!DEBUG!! OpenGL Error: %d\n", error));
 304                 }
 305         } while (error != GL_NO_ERROR);
 306 #endif
 307
 308         SDL_GL_SwapWindow(GL_window);
 309
 310         opengl1_tcache_frame();
 311
 312         int cnt = GL_activate;
 313         if ( cnt )      {
 314                 GL_activate-=cnt;
 315                 opengl1_tcache_flush();
 316                 // gr_opengl_clip_cursor(1); /* mouse grab, see opengl_activate */
 317         }
 318
 319         cnt = GL_deactivate;
 320         if ( cnt )      {
 321                 GL_deactivate-=cnt;
 322                 // gr_opengl_clip_cursor(0);  /* mouse grab, see opengl_activate */
 323         }
 324 }
 325
 326 void gr_opengl1_set_clip(int x,int y,int w,int h)
 327 {
 328         // check for sanity of parameters
 329         if (x < 0)
 330                 x = 0;
 331         if (y < 0)
 332                 y = 0;
 333
 334         if (x >= gr_screen.max_w)
 335                 x = gr_screen.max_w - 1;
 336         if (y >= gr_screen.max_h)
 337                 y = gr_screen.max_h - 1;
 338
 339         if (x + w > gr_screen.max_w)
 340                 w = gr_screen.max_w - x;
 341         if (y + h > gr_screen.max_h)
 342                 h = gr_screen.max_h - y;
 343
 344         if (w > gr_screen.max_w)
 345                 w = gr_screen.max_w;
 346         if (h > gr_screen.max_h)
 347                 h = gr_screen.max_h;
 348
 349         gr_screen.offset_x = x;
 350         gr_screen.offset_y = y;
 351         gr_screen.clip_left = 0;
 352         gr_screen.clip_right = w-1;
 353         gr_screen.clip_top = 0;
 354         gr_screen.clip_bottom = h-1;
 355         gr_screen.clip_width = w;
 356         gr_screen.clip_height = h;
 357
 358         x = fl2i((x * GL_viewport_scale_w) + 0.5f) + GL_viewport_x;
 359         y = fl2i((y * GL_viewport_scale_h) + 0.5f) + GL_viewport_y;
 360         w = fl2i((w * GL_viewport_scale_w) + 0.5f);
 361         h = fl2i((h * GL_viewport_scale_h) + 0.5f);
 362
 363         glEnable(GL_SCISSOR_TEST);
 364         glScissor(x, GL_viewport_h-y-h, w, h);
 365 }
 366
 367 void gr_opengl1_reset_clip()
 368 {
 369         gr_screen.offset_x = 0;
 370         gr_screen.offset_y = 0;
 371         gr_screen.clip_left = 0;
 372         gr_screen.clip_top = 0;
 373         gr_screen.clip_right = gr_screen.max_w - 1;
 374         gr_screen.clip_bottom = gr_screen.max_h - 1;
 375         gr_screen.clip_width = gr_screen.max_w;
 376         gr_screen.clip_height = gr_screen.max_h;
 377
 378         glDisable(GL_SCISSOR_TEST);
 379 }
 380
 381 void gr_opengl1_print_screen(const char *filename)
 382 {
 383         char tmp[MAX_FILENAME_LEN];
 384         ubyte *buf = NULL;
 385
 386         strcpy( tmp, filename );
 387         strcat( tmp, NOX(".tga"));
 388
 389         buf = (ubyte*)malloc(GL_viewport_w * GL_viewport_h * 3);
 390
 391         if (buf == NULL) {
 392                 return;
 393         }
 394
 395         CFILE *f = cfopen(tmp, "wb", CFILE_NORMAL, CF_TYPE_ROOT);
 396
 397         if (f == NULL) {
 398                 free(buf);
 399                 return;
 400         }
 401
 402         // Write the TGA header
 403         cfwrite_ubyte( 0, f );  //      IDLength;
 404         cfwrite_ubyte( 0, f );  //      ColorMapType;
 405         cfwrite_ubyte( 2, f );  //      ImageType;              // 2 = 24bpp, uncompressed, 10=24bpp rle compressed
 406         cfwrite_ushort( 0, f ); // CMapStart;
 407         cfwrite_ushort( 0, f ); //      CMapLength;
 408         cfwrite_ubyte( 0, f );  // CMapDepth;
 409         cfwrite_ushort( 0, f ); //      XOffset;
 410         cfwrite_ushort( 0, f ); //      YOffset;
 411         cfwrite_ushort( (ushort)GL_viewport_w, f );     //      Width;
 412         cfwrite_ushort( (ushort)GL_viewport_h, f );     //      Height;
 413         cfwrite_ubyte( 24, f ); //PixelDepth;
 414         cfwrite_ubyte( 0, f );  //ImageDesc;
 415
 416         memset(buf, 0, GL_viewport_w * GL_viewport_h * 3);
 417
 418         glReadPixels(GL_viewport_x, GL_viewport_y, GL_viewport_w, GL_viewport_h, GL_BGR, GL_UNSIGNED_BYTE, buf);
 419
 420         cfwrite(buf, GL_viewport_w * GL_viewport_h * 3, 1, f);
 421
 422         cfclose(f);
 423
 424         free(buf);
 425 }
 426
 427 void gr_opengl1_fog_set(int fog_mode, int r, int g, int b, float fog_near, float fog_far)
 428 {
 429         SDL_assert((r >= 0) && (r < 256));
 430         SDL_assert((g >= 0) && (g < 256));
 431         SDL_assert((b >= 0) && (b < 256));
 432
 433         if (fog_mode == GR_FOGMODE_NONE) {
 434                 if (gr_screen.current_fog_mode != fog_mode) {
 435                         glDisable(GL_FOG);
 436
 437                         if (OGL_fog_mode == 1) {
 438                                 glDisable(GL_COLOR_SUM);
 439                         }
 440                 }
 441
 442                 gr_screen.current_fog_mode = fog_mode;
 443
 444                 return;
 445         }
 446
 447         if (gr_screen.current_fog_mode != fog_mode) {
 448                 glEnable(GL_FOG);
 449
 450                 if (OGL_fog_mode == 1) {
 451                         glEnable(GL_COLOR_SUM);
 452                 } else if (OGL_fog_mode == 2) {
 453                         glFogi(GL_FOG_MODE, GL_LINEAR);
 454                 }
 455
 456                 gr_screen.current_fog_mode = fog_mode;
 457         }
 458
 459         if ( (gr_screen.current_fog_color.red != r) ||
 460                         (gr_screen.current_fog_color.green != g) ||
 461                         (gr_screen.current_fog_color.blue != b) ) {
 462                 GLfloat fc[4];
 463
 464                 gr_opengl_init_color( &gr_screen.current_fog_color, r, g, b );
 465
 466                 fc[0] = (float)r/255.0;
 467                 fc[1] = (float)g/255.0;
 468                 fc[2] = (float)b/255.0;
 469                 fc[3] = 1.0;
 470
 471                 glFogfv(GL_FOG_COLOR, fc);
 472         }
 473
 474         if( (fog_near >= 0.0f) && (fog_far >= 0.0f) &&
 475                         ((fog_near != gr_screen.fog_near) ||
 476                         (fog_far != gr_screen.fog_far)) ) {
 477                 gr_screen.fog_near = fog_near;
 478                 gr_screen.fog_far = fog_far;
 479
 480                 if (OGL_fog_mode == 2) {
 481                         glFogf(GL_FOG_START, fog_near);
 482                         glFogf(GL_FOG_END, fog_far);
 483                 }
 484         }
 485 }
 486
 487 void gr_opengl1_set_cull(int cull)
 488 {
 489         if (cull) {
 490                 glEnable (GL_CULL_FACE);
 491                 glFrontFace (GL_CCW);
 492         } else {
 493                 glDisable (GL_CULL_FACE);
 494         }
 495 }
 496
 497 void gr_opengl1_zbuffer_clear(int mode)
 498 {
 499         if (mode) {
 500                 Gr_zbuffering = 1;
 501                 Gr_zbuffering_mode = GR_ZBUFF_FULL;
 502                 Gr_global_zbuffering = 1;
 503
 504                 opengl1_set_state( TEXTURE_SOURCE_NONE, ALPHA_BLEND_NONE, ZBUFFER_TYPE_FULL );
 505                 glClear ( GL_DEPTH_BUFFER_BIT );
 506         } else {
 507                 Gr_zbuffering = 0;
 508                 Gr_zbuffering_mode = GR_ZBUFF_NONE;
 509                 Gr_global_zbuffering = 0;
 510         }
 511 }
 512
 513 void gr_opengl1_fade_in(int instantaneous)
 514 {
 515         // Empty - DDOI
 516 }
 517
 518 void gr_opengl1_fade_out(int instantaneous)
 519 {
 520         // Empty - DDOI
 521 }
 522
 523 void gr_opengl1_get_region(int front, int w, int h, ubyte *data)
 524 {
 525         if (front) {
 526                 glReadBuffer(GL_FRONT);
 527         } else {
 528                 glReadBuffer(GL_BACK);
 529         }
 530
 531         opengl1_set_state(TEXTURE_SOURCE_NO_FILTERING, ALPHA_BLEND_NONE, ZBUFFER_TYPE_NONE);
 532
 533         glPixelStorei(GL_UNPACK_ROW_LENGTH, GL_viewport_w);
 534
 535         int x = GL_viewport_x;
 536         int y = (GL_viewport_y+GL_viewport_h)-h-1;
 537
 538         GLenum pxtype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
 539
 540         if (gr_screen.bytes_per_pixel == 4) {
 541                 pxtype = GL_UNSIGNED_BYTE;
 542         }
 543
 544         glReadPixels(x, y, w, h, GL_BGRA, pxtype, data);
 545
 546         glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 547 }
 548
 549 void gr_opengl1_save_mouse_area(int x, int y, int w, int h)
 550 {
 551         int x1, y1, x2, y2;
 552
 553         w = fl2i((w * GL_viewport_scale_w) + 0.5f);
 554         h = fl2i((h * GL_viewport_scale_h) + 0.5f);
 555
 556         x1 = x;
 557         y1 = y;
 558         x2 = x+w-1;
 559         y2 = y+h-1;
 560
 561         CAP(x1, 0, GL_viewport_w);
 562         CAP(x2, 0, GL_viewport_w);
 563         CAP(y1, 0, GL_viewport_h);
 564         CAP(y2, 0, GL_viewport_h);
 565
 566         Gr_opengl_mouse_saved_x = x1;
 567         Gr_opengl_mouse_saved_y = y1;
 568         Gr_opengl_mouse_saved_w = x2 - x1 + 1;
 569         Gr_opengl_mouse_saved_h = y2 - y1 + 1;
 570
 571         if ( (Gr_opengl_mouse_saved_w < 1) || (Gr_opengl_mouse_saved_h < 1) ) {
 572                 return;
 573         }
 574
 575         if (Gr_opengl_mouse_saved_data == NULL) {
 576                 Gr_opengl_mouse_saved_data = (ubyte*)malloc(w * h * gr_screen.bytes_per_pixel);
 577
 578                 if ( !Gr_opengl_mouse_saved_data ) {
 579                         return;
 580                 }
 581         }
 582
 583         opengl1_set_state(TEXTURE_SOURCE_NO_FILTERING, ALPHA_BLEND_NONE, ZBUFFER_TYPE_NONE);
 584
 585         x1 = GL_viewport_x+Gr_opengl_mouse_saved_x;
 586         y1 = (GL_viewport_y+GL_viewport_h)-Gr_opengl_mouse_saved_y-Gr_opengl_mouse_saved_h;
 587
 588         GLenum pxtype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
 589
 590         if (gr_screen.bytes_per_pixel == 4) {
 591                 pxtype = GL_UNSIGNED_BYTE;
 592         }
 593
 594         glReadBuffer(GL_BACK);
 595         glReadPixels(x1, y1, Gr_opengl_mouse_saved_w, Gr_opengl_mouse_saved_h,
 596                         GL_BGRA, pxtype, Gr_opengl_mouse_saved_data);
 597
 598         Gr_opengl_mouse_saved = 1;
 599 }
 600
 601 int gr_opengl1_save_screen()
 602 {
 603         gr_reset_clip();
 604
 605         if (Gr_saved_screen_tex) {
 606                 mprintf(( "Screen already saved!\n" ));
 607                 return -1;
 608         }
 609
 610         glGenTextures(1, &Gr_saved_screen_tex);
 611
 612         if ( !Gr_saved_screen_tex ) {
 613                 mprintf(( "Couldn't create texture for saved screen!\n" ));
 614                 return -1;
 615         }
 616
 617         opengl1_set_state(TEXTURE_SOURCE_NO_FILTERING, ALPHA_BLEND_NONE, ZBUFFER_TYPE_NONE);
 618
 619         glBindTexture(GL_TEXTURE_2D, Gr_saved_screen_tex);
 620
 621         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 622         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 623         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
 624         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
 625         glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 626
 627         glReadBuffer(GL_FRONT);
 628         glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, GL_viewport_x, GL_viewport_y,
 629                         GL_viewport_w, GL_viewport_h, 0);
 630
 631         if (Gr_opengl_mouse_saved) {
 632                 int x = Gr_opengl_mouse_saved_x;
 633                 int y = GL_viewport_h-Gr_opengl_mouse_saved_y-Gr_opengl_mouse_saved_h;
 634
 635                 GLenum pxtype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
 636
 637                 if (gr_screen.bytes_per_pixel == 4) {
 638                         pxtype = GL_UNSIGNED_BYTE;
 639                 }
 640
 641                 glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, Gr_opengl_mouse_saved_w,
 642                                 Gr_opengl_mouse_saved_h, GL_BGRA, pxtype,
 643                                 Gr_opengl_mouse_saved_data);
 644         }
 645
 646         glBindTexture(GL_TEXTURE_2D, 0);
 647
 648         return 0;
 649 }
 650
 651 void gr_opengl1_restore_screen(int id)
 652 {
 653         gr_reset_clip();
 654
 655         if ( !Gr_saved_screen_tex ) {
 656                 gr_clear();
 657                 return;
 658         }
 659
 660         glBindTexture(GL_TEXTURE_2D, Gr_saved_screen_tex);
 661
 662         if (Gr_opengl_mouse_saved) {
 663                 int x = Gr_opengl_mouse_saved_x;
 664                 int y = GL_viewport_h-Gr_opengl_mouse_saved_y-Gr_opengl_mouse_saved_h;
 665
 666                 GLenum pxtype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
 667
 668                 if (gr_screen.bytes_per_pixel == 4) {
 669                         pxtype = GL_UNSIGNED_BYTE;
 670                 }
 671
 672                 glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, Gr_opengl_mouse_saved_w,
 673                                 Gr_opengl_mouse_saved_h, GL_BGRA, pxtype,
 674                                 Gr_opengl_mouse_saved_data);
 675         }
 676
 677         glMatrixMode(GL_MODELVIEW);
 678         glPushMatrix();
 679         glLoadIdentity();
 680         glScalef(1.0f, -1.0f, 1.0f);
 681
 682         int tex_coord[] = { 0, 0, 0, 1, 1, 0, 1, 1 };
 683         int ver_coord[] = { GL_viewport_x, GL_viewport_y, GL_viewport_x,
 684                         GL_viewport_h, GL_viewport_w, GL_viewport_y, GL_viewport_w,
 685                         GL_viewport_h
 686         };
 687
 688         glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 689         glEnableClientState(GL_VERTEX_ARRAY);
 690
 691         glTexCoordPointer(2, GL_INT, 0, &tex_coord);
 692         glVertexPointer(2, GL_INT, 0, &ver_coord);
 693
 694         glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 695
 696         glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 697         glDisableClientState(GL_VERTEX_ARRAY);
 698
 699         glPopMatrix();
 700
 701         glBindTexture(GL_TEXTURE_2D, 0);
 702 }
 703
 704 void gr_opengl1_free_screen(int id)
 705 {
 706         if (Gr_saved_screen_tex) {
 707                 glDeleteTextures(1, &Gr_saved_screen_tex);
 708                 Gr_saved_screen_tex = 0;
 709         }
 710 }
 711
 712 void gr_opengl1_dump_frame_start(int first_frame, int frames_between_dumps)
 713 {
 714         STUB_FUNCTION;
 715 }
 716
 717 void gr_opengl1_dump_frame_stop()
 718 {
 719         STUB_FUNCTION;
 720 }
 721
 722 void gr_opengl1_dump_frame()
 723 {
 724         STUB_FUNCTION;
 725 }
 726
 727 uint gr_opengl1_lock()
 728 {
 729         return 1;
 730 }
 731
 732 void gr_opengl1_unlock()
 733 {
 734 }
 735
 736 void gr_opengl1_zbias(int bias)
 737 {
 738         if (bias) {
 739                 glEnable(GL_POLYGON_OFFSET_FILL);
 740                 glPolygonOffset(0.0, -bias);
 741         } else {
 742                 glDisable(GL_POLYGON_OFFSET_FILL);
 743         }
 744 }