src/graphics/grgl1.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 "grgl1.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 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         gr_opengl1_free_screen(0);
 109
 110         if (Gr_opengl_mouse_saved_data) {
 111                 free(Gr_opengl_mouse_saved_data);
 112                 Gr_opengl_mouse_saved_data = NULL;
 113         }
 114
 115         opengl1_tcache_cleanup();
 116
 117         GL_one_inited = 0;
 118 }
 119
 120 static void opengl1_init_func_pointers()
 121 {
 122         gr_screen.gf_flip = gr_opengl1_flip;
 123         gr_screen.gf_set_clip = gr_opengl1_set_clip;
 124         gr_screen.gf_reset_clip = gr_opengl1_reset_clip;
 125
 126         gr_screen.gf_clear = gr_opengl1_clear;
 127
 128         gr_screen.gf_aabitmap = gr_opengl1_aabitmap;
 129         gr_screen.gf_aabitmap_ex = gr_opengl1_aabitmap_ex;
 130
 131         gr_screen.gf_rect = gr_opengl1_rect;
 132         gr_screen.gf_shade = gr_opengl1_shade;
 133         gr_screen.gf_string = gr_opengl1_string;
 134         gr_screen.gf_circle = gr_opengl1_circle;
 135
 136         gr_screen.gf_line = gr_opengl1_line;
 137         gr_screen.gf_aaline = gr_opengl1_aaline;
 138         gr_screen.gf_pixel = gr_opengl1_pixel;
 139         gr_screen.gf_scaler = gr_opengl1_scaler;
 140         gr_screen.gf_tmapper = gr_opengl1_tmapper;
 141
 142         gr_screen.gf_gradient = gr_opengl1_gradient;
 143
 144         gr_screen.gf_print_screen = gr_opengl1_print_screen;
 145
 146         gr_screen.gf_fade_in = gr_opengl1_fade_in;
 147         gr_screen.gf_fade_out = gr_opengl1_fade_out;
 148         gr_screen.gf_flash = gr_opengl1_flash;
 149
 150         gr_screen.gf_zbuffer_clear = gr_opengl1_zbuffer_clear;
 151
 152         gr_screen.gf_save_screen = gr_opengl1_save_screen;
 153         gr_screen.gf_restore_screen = gr_opengl1_restore_screen;
 154         gr_screen.gf_free_screen = gr_opengl1_free_screen;
 155
 156         gr_screen.gf_dump_frame_start = gr_opengl1_dump_frame_start;
 157         gr_screen.gf_dump_frame_stop = gr_opengl1_dump_frame_stop;
 158         gr_screen.gf_dump_frame = gr_opengl1_dump_frame;
 159
 160         gr_screen.gf_set_gamma = gr_opengl1_set_gamma;
 161
 162         gr_screen.gf_lock = gr_opengl1_lock;
 163         gr_screen.gf_unlock = gr_opengl1_unlock;
 164
 165         gr_screen.gf_fog_set = gr_opengl1_fog_set;
 166
 167         gr_screen.gf_get_region = gr_opengl1_get_region;
 168
 169         gr_screen.gf_set_cull = gr_opengl1_set_cull;
 170
 171         gr_screen.gf_cross_fade = gr_opengl1_cross_fade;
 172
 173         gr_screen.gf_preload_init = gr_opengl1_preload_init;
 174         gr_screen.gf_preload = gr_opengl1_preload;
 175
 176         gr_screen.gf_zbias = gr_opengl1_zbias;
 177
 178         gr_screen.gf_force_windowed = gr_opengl_force_windowed;
 179         gr_screen.gf_force_fullscreen = gr_opengl_force_fullscreen;
 180         gr_screen.gf_toggle_fullscreen = gr_opengl_toggle_fullscreen;
 181
 182         gr_screen.gf_set_viewport = gr_opengl1_set_viewport;
 183
 184         gr_screen.gf_activate = gr_opengl1_activate;
 185
 186         gr_screen.gf_release_texture = gr_opengl1_release_texture;
 187 }
 188
 189 void opengl1_init()
 190 {
 191         if (GL_one_inited) {
 192                 return;
 193         }
 194
 195         /*
 196           1 = use secondary color ext
 197           2 = use opengl linear fog
 198          */
 199         OGL_fog_mode = 2;
 200
 201         // only available with OpenGL 1.2+, must get ptr for Windows
 202         vglSecondaryColorPointer = (PFNGLSECONDARYCOLORPOINTERPROC)SDL_GL_GetProcAddress("glSecondaryColorPointer");
 203
 204         if (vglSecondaryColorPointer) {
 205                 OGL_fog_mode = 1;
 206         }
 207
 208         mprintf(("  Fog mode : %s\n", (OGL_fog_mode == 1) ? "secondary color" : "linear"));
 209
 210         glShadeModel(GL_SMOOTH);
 211         glEnable(GL_DITHER);
 212         glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
 213         glHint(GL_FOG_HINT, GL_NICEST);
 214
 215         glEnable(GL_DEPTH_TEST);
 216         glEnable(GL_BLEND);
 217
 218         glEnable(GL_TEXTURE_2D);
 219
 220         glDepthRange(0.0, 1.0);
 221
 222         glPixelStorei(GL_PACK_ALIGNMENT, 1);
 223         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 224
 225         glFlush();
 226
 227         opengl1_init_func_pointers();
 228         opengl1_tcache_init();
 229
 230         gr_opengl1_clear();
 231
 232         GL_one_inited = 1;
 233 }
 234
 235 void gr_opengl1_activate(int active)
 236 {
 237         if (active) {
 238                 GL_activate++;
 239
 240                 // don't grab key/mouse if cmdline says so or if we're fullscreen
 241         //      if(!Cmdline_no_grab && !(SDL_GetVideoSurface()->flags & SDL_FULLSCREEN)) {
 242         //              SDL_WM_GrabInput(SDL_GRAB_ON);
 243         //      }
 244         } else {
 245                 GL_deactivate++;
 246
 247                 // let go of mouse/keyboard
 248         //      SDL_WM_GrabInput(SDL_GRAB_OFF);
 249         }
 250 }
 251
 252 void gr_opengl1_clear()
 253 {
 254         glClearColor(gr_screen.current_clear_color.red / 255.0f,
 255                 gr_screen.current_clear_color.green / 255.0f,
 256                 gr_screen.current_clear_color.blue / 255.0f, 1.0f);
 257
 258         glClear( GL_COLOR_BUFFER_BIT );
 259 }
 260
 261 void gr_opengl1_flip()
 262 {
 263         if ( !GL_one_inited ) {
 264                 return;
 265         }
 266
 267         gr_reset_clip();
 268
 269         mouse_eval_deltas();
 270
 271         Gr_opengl_mouse_saved = 0;
 272
 273         if ( mouse_is_visible() )       {
 274                 int mx, my;
 275
 276                 gr_reset_clip();
 277                 mouse_get_pos( &mx, &my );
 278
 279                 gr_opengl1_save_mouse_area(mx,my,32,32);
 280
 281                 if (Gr_cursor == -1) {
 282 #ifndef NDEBUG
 283                         gr_set_color(255,255,255);
 284                         gr_line(mx, my, mx+7, my + 7);
 285                         gr_line(mx, my, mx+5, my );
 286                         gr_line(mx, my, mx, my+5);
 287 #endif
 288                 } else {
 289                         gr_set_bitmap(Gr_cursor);
 290                         gr_bitmap(mx, my);
 291                 }
 292          }
 293
 294 #ifndef NDEBUG
 295         GLenum error = GL_NO_ERROR;
 296
 297         do {
 298                 error = glGetError();
 299
 300                 if (error != GL_NO_ERROR) {
 301                         nprintf(("Warning", "!!DEBUG!! OpenGL Error: %d\n", error));
 302                 }
 303         } while (error != GL_NO_ERROR);
 304 #endif
 305
 306         SDL_GL_SwapWindow(GL_window);
 307
 308         opengl1_tcache_frame();
 309
 310         int cnt = GL_activate;
 311         if ( cnt )      {
 312                 GL_activate-=cnt;
 313                 opengl1_tcache_flush();
 314                 // gr_opengl_clip_cursor(1); /* mouse grab, see opengl_activate */
 315         }
 316
 317         cnt = GL_deactivate;
 318         if ( cnt )      {
 319                 GL_deactivate-=cnt;
 320                 // gr_opengl_clip_cursor(0);  /* mouse grab, see opengl_activate */
 321         }
 322 }
 323
 324 void gr_opengl1_set_clip(int x,int y,int w,int h)
 325 {
 326         // check for sanity of parameters
 327         if (x < 0)
 328                 x = 0;
 329         if (y < 0)
 330                 y = 0;
 331
 332         if (x >= gr_screen.max_w)
 333                 x = gr_screen.max_w - 1;
 334         if (y >= gr_screen.max_h)
 335                 y = gr_screen.max_h - 1;
 336
 337         if (x + w > gr_screen.max_w)
 338                 w = gr_screen.max_w - x;
 339         if (y + h > gr_screen.max_h)
 340                 h = gr_screen.max_h - y;
 341
 342         if (w > gr_screen.max_w)
 343                 w = gr_screen.max_w;
 344         if (h > gr_screen.max_h)
 345                 h = gr_screen.max_h;
 346
 347         gr_screen.offset_x = x;
 348         gr_screen.offset_y = y;
 349         gr_screen.clip_left = 0;
 350         gr_screen.clip_right = w-1;
 351         gr_screen.clip_top = 0;
 352         gr_screen.clip_bottom = h-1;
 353         gr_screen.clip_width = w;
 354         gr_screen.clip_height = h;
 355
 356         x = fl2i((x * GL_viewport_scale_w) + 0.5f) + GL_viewport_x;
 357         y = fl2i((y * GL_viewport_scale_h) + 0.5f) + GL_viewport_y;
 358         w = fl2i((w * GL_viewport_scale_w) + 0.5f);
 359         h = fl2i((h * GL_viewport_scale_h) + 0.5f);
 360
 361         glEnable(GL_SCISSOR_TEST);
 362         glScissor(x, GL_viewport_h-y-h, w, h);
 363 }
 364
 365 void gr_opengl1_reset_clip()
 366 {
 367         gr_screen.offset_x = 0;
 368         gr_screen.offset_y = 0;
 369         gr_screen.clip_left = 0;
 370         gr_screen.clip_top = 0;
 371         gr_screen.clip_right = gr_screen.max_w - 1;
 372         gr_screen.clip_bottom = gr_screen.max_h - 1;
 373         gr_screen.clip_width = gr_screen.max_w;
 374         gr_screen.clip_height = gr_screen.max_h;
 375
 376         glDisable(GL_SCISSOR_TEST);
 377 }
 378
 379 void gr_opengl1_print_screen(const char *filename)
 380 {
 381         char tmp[MAX_FILENAME_LEN];
 382         ubyte *buf = NULL;
 383
 384         SDL_strlcpy( tmp, filename, sizeof(tmp) );
 385         SDL_strlcat( tmp, NOX(".tga"), sizeof(tmp) );
 386
 387         buf = (ubyte*)malloc(GL_viewport_w * GL_viewport_h * 3);
 388
 389         if (buf == NULL) {
 390                 return;
 391         }
 392
 393         CFILE *f = cfopen(tmp, "wb", CFILE_NORMAL, CF_TYPE_ROOT);
 394
 395         if (f == NULL) {
 396                 free(buf);
 397                 return;
 398         }
 399
 400         // Write the TGA header
 401         cfwrite_ubyte( 0, f );  //      IDLength;
 402         cfwrite_ubyte( 0, f );  //      ColorMapType;
 403         cfwrite_ubyte( 2, f );  //      ImageType;              // 2 = 24bpp, uncompressed, 10=24bpp rle compressed
 404         cfwrite_ushort( 0, f ); // CMapStart;
 405         cfwrite_ushort( 0, f ); //      CMapLength;
 406         cfwrite_ubyte( 0, f );  // CMapDepth;
 407         cfwrite_ushort( 0, f ); //      XOffset;
 408         cfwrite_ushort( 0, f ); //      YOffset;
 409         cfwrite_ushort( (ushort)GL_viewport_w, f );     //      Width;
 410         cfwrite_ushort( (ushort)GL_viewport_h, f );     //      Height;
 411         cfwrite_ubyte( 24, f ); //PixelDepth;
 412         cfwrite_ubyte( 0, f );  //ImageDesc;
 413
 414         memset(buf, 0, GL_viewport_w * GL_viewport_h * 3);
 415
 416         glReadPixels(GL_viewport_x, GL_viewport_y, GL_viewport_w, GL_viewport_h, GL_BGR, GL_UNSIGNED_BYTE, buf);
 417
 418         cfwrite(buf, GL_viewport_w * GL_viewport_h * 3, 1, f);
 419
 420         cfclose(f);
 421
 422         free(buf);
 423 }
 424
 425 void gr_opengl1_fog_set(int fog_mode, int r, int g, int b, float fog_near, float fog_far)
 426 {
 427         SDL_assert((r >= 0) && (r < 256));
 428         SDL_assert((g >= 0) && (g < 256));
 429         SDL_assert((b >= 0) && (b < 256));
 430
 431         if (fog_mode == GR_FOGMODE_NONE) {
 432                 if (gr_screen.current_fog_mode != fog_mode) {
 433                         glDisable(GL_FOG);
 434
 435                         if (OGL_fog_mode == 1) {
 436                                 glDisable(GL_COLOR_SUM);
 437                         }
 438                 }
 439
 440                 gr_screen.current_fog_mode = fog_mode;
 441
 442                 return;
 443         }
 444
 445         if (gr_screen.current_fog_mode != fog_mode) {
 446                 glEnable(GL_FOG);
 447
 448                 if (OGL_fog_mode == 1) {
 449                         glEnable(GL_COLOR_SUM);
 450                 } else if (OGL_fog_mode == 2) {
 451                         glFogi(GL_FOG_MODE, GL_LINEAR);
 452                 }
 453
 454                 gr_screen.current_fog_mode = fog_mode;
 455         }
 456
 457         if ( (gr_screen.current_fog_color.red != r) ||
 458                         (gr_screen.current_fog_color.green != g) ||
 459                         (gr_screen.current_fog_color.blue != b) ) {
 460                 GLfloat fc[4];
 461
 462                 gr_init_color( &gr_screen.current_fog_color, r, g, b );
 463
 464                 fc[0] = r / 255.0f;
 465                 fc[1] = g / 255.0f;
 466                 fc[2] = b / 255.0f;
 467                 fc[3] = 1.0f;
 468
 469                 glFogfv(GL_FOG_COLOR, fc);
 470         }
 471
 472         if( (fog_near >= 0.0f) && (fog_far >= 0.0f) &&
 473                         ((fog_near != gr_screen.fog_near) ||
 474                         (fog_far != gr_screen.fog_far)) ) {
 475                 gr_screen.fog_near = fog_near;
 476                 gr_screen.fog_far = fog_far;
 477
 478                 if (OGL_fog_mode == 2) {
 479                         glFogf(GL_FOG_START, fog_near);
 480                         glFogf(GL_FOG_END, fog_far);
 481                 }
 482         }
 483 }
 484
 485 void gr_opengl1_set_cull(int cull)
 486 {
 487         if (cull) {
 488                 glEnable (GL_CULL_FACE);
 489                 glFrontFace (GL_CCW);
 490         } else {
 491                 glDisable (GL_CULL_FACE);
 492         }
 493 }
 494
 495 void gr_opengl1_zbuffer_clear(int mode)
 496 {
 497         if (mode) {
 498                 Gr_zbuffering = 1;
 499                 Gr_zbuffering_mode = GR_ZBUFF_FULL;
 500                 Gr_global_zbuffering = 1;
 501
 502                 opengl1_set_state( TEXTURE_SOURCE_NONE, ALPHA_BLEND_NONE, ZBUFFER_TYPE_FULL );
 503                 glClear ( GL_DEPTH_BUFFER_BIT );
 504         } else {
 505                 Gr_zbuffering = 0;
 506                 Gr_zbuffering_mode = GR_ZBUFF_NONE;
 507                 Gr_global_zbuffering = 0;
 508         }
 509 }
 510
 511 void gr_opengl1_fade_in(int instantaneous)
 512 {
 513         // Empty - DDOI
 514 }
 515
 516 void gr_opengl1_fade_out(int instantaneous)
 517 {
 518         // Empty - DDOI
 519 }
 520
 521 void gr_opengl1_get_region(int front, int w, int h, ubyte *data)
 522 {
 523         if (front) {
 524                 glReadBuffer(GL_FRONT);
 525         } else {
 526                 glReadBuffer(GL_BACK);
 527         }
 528
 529         opengl1_set_state(TEXTURE_SOURCE_NO_FILTERING, ALPHA_BLEND_NONE, ZBUFFER_TYPE_NONE);
 530
 531         glPixelStorei(GL_UNPACK_ROW_LENGTH, GL_viewport_w);
 532
 533         int x = GL_viewport_x;
 534         int y = (GL_viewport_y+GL_viewport_h)-h-1;
 535
 536         GLenum pxtype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
 537
 538         if (gr_screen.bytes_per_pixel == 4) {
 539                 pxtype = GL_UNSIGNED_BYTE;
 540         }
 541
 542         glReadPixels(x, y, w, h, GL_BGRA, pxtype, data);
 543
 544         glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 545 }
 546
 547 void gr_opengl1_save_mouse_area(int x, int y, int w, int h)
 548 {
 549         int x1, y1, x2, y2;
 550
 551         if (Gr_saved_screen_tex) {
 552                 // already saved, don't need it again
 553                 return;
 554         }
 555
 556         w = fl2i((w * GL_viewport_scale_w) + 0.5f);
 557         h = fl2i((h * GL_viewport_scale_h) + 0.5f);
 558
 559         x1 = x;
 560         y1 = y;
 561         x2 = x+w-1;
 562         y2 = y+h-1;
 563
 564         CAP(x1, 0, GL_viewport_w);
 565         CAP(x2, 0, GL_viewport_w);
 566         CAP(y1, 0, GL_viewport_h);
 567         CAP(y2, 0, GL_viewport_h);
 568
 569         Gr_opengl_mouse_saved_x = x1;
 570         Gr_opengl_mouse_saved_y = y1;
 571         Gr_opengl_mouse_saved_w = x2 - x1 + 1;
 572         Gr_opengl_mouse_saved_h = y2 - y1 + 1;
 573
 574         if ( (Gr_opengl_mouse_saved_w < 1) || (Gr_opengl_mouse_saved_h < 1) ) {
 575                 return;
 576         }
 577
 578         if (Gr_opengl_mouse_saved_data == NULL) {
 579                 Gr_opengl_mouse_saved_data = (ubyte*)malloc(w * h * 3);
 580
 581                 if ( !Gr_opengl_mouse_saved_data ) {
 582                         return;
 583                 }
 584         }
 585
 586         x1 = GL_viewport_x+Gr_opengl_mouse_saved_x;
 587         y1 = (GL_viewport_y+GL_viewport_h)-Gr_opengl_mouse_saved_y-Gr_opengl_mouse_saved_h;
 588
 589         glReadBuffer(GL_BACK);
 590
 591         glReadPixels(x1, y1, Gr_opengl_mouse_saved_w, Gr_opengl_mouse_saved_h,
 592                         GL_BGR, GL_UNSIGNED_BYTE, Gr_opengl_mouse_saved_data);
 593
 594         Gr_opengl_mouse_saved = 1;
 595 }
 596
 597 int gr_opengl1_save_screen()
 598 {
 599         gr_reset_clip();
 600
 601         if (Gr_saved_screen_tex) {
 602                 mprintf(( "Screen already saved!\n" ));
 603                 return -1;
 604         }
 605
 606         glGenTextures(1, &Gr_saved_screen_tex);
 607
 608         if ( !Gr_saved_screen_tex ) {
 609                 mprintf(( "Couldn't create texture for saved screen!\n" ));
 610                 return -1;
 611         }
 612
 613         glBindTexture(GL_TEXTURE_2D, Gr_saved_screen_tex);
 614
 615         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 616         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 617         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
 618         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
 619         glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 620
 621         glReadBuffer(GL_FRONT);
 622
 623         glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, GL_viewport_x, GL_viewport_y,
 624                         GL_viewport_w, GL_viewport_h, 0);
 625
 626         if (Gr_opengl_mouse_saved) {
 627                 int x = Gr_opengl_mouse_saved_x;
 628                 int y = GL_viewport_h-Gr_opengl_mouse_saved_y-Gr_opengl_mouse_saved_h;
 629
 630                 glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, Gr_opengl_mouse_saved_w,
 631                                 Gr_opengl_mouse_saved_h, GL_BGR, GL_UNSIGNED_BYTE,
 632                                 Gr_opengl_mouse_saved_data);
 633         }
 634
 635         glBindTexture(GL_TEXTURE_2D, 0);
 636
 637         return 0;
 638 }
 639
 640 void gr_opengl1_restore_screen(int)
 641 {
 642         gr_reset_clip();
 643
 644         if ( !Gr_saved_screen_tex ) {
 645                 gr_clear();
 646                 return;
 647         }
 648
 649         const float scale_w = 1.0f / GL_viewport_scale_w;
 650         const float scale_h = 1.0f / GL_viewport_scale_h;
 651
 652         const int tex_coord[] = { 0, 1, 0, 0, 1, 1, 1, 0 };     // y-flipped
 653         const int ver_coord[] = { GL_viewport_x, GL_viewport_y, GL_viewport_x,
 654                         (GL_viewport_h * scale_h), (GL_viewport_w * scale_w), GL_viewport_y,
 655                         (GL_viewport_w * scale_w), (GL_viewport_h * scale_h)
 656         };
 657
 658         glColor4ub(255, 255, 255, 255);
 659
 660         glBindTexture(GL_TEXTURE_2D, Gr_saved_screen_tex);
 661
 662         opengl1_set_state(TEXTURE_SOURCE_NO_FILTERING, ALPHA_BLEND_NONE, ZBUFFER_TYPE_NONE);
 663
 664         glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 665         glEnableClientState(GL_VERTEX_ARRAY);
 666
 667         glTexCoordPointer(2, GL_INT, 0, &tex_coord);
 668         glVertexPointer(2, GL_INT, 0, &ver_coord);
 669
 670         glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 671
 672         glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 673         glDisableClientState(GL_VERTEX_ARRAY);
 674
 675         glBindTexture(GL_TEXTURE_2D, 0);
 676 }
 677
 678 void gr_opengl1_free_screen(int)
 679 {
 680         if (Gr_saved_screen_tex) {
 681                 glDeleteTextures(1, &Gr_saved_screen_tex);
 682                 Gr_saved_screen_tex = 0;
 683         }
 684 }
 685
 686 void gr_opengl1_dump_frame_start(int first_frame, int frames_between_dumps)
 687 {
 688         STUB_FUNCTION;
 689 }
 690
 691 void gr_opengl1_dump_frame_stop()
 692 {
 693         STUB_FUNCTION;
 694 }
 695
 696 void gr_opengl1_dump_frame()
 697 {
 698         STUB_FUNCTION;
 699 }
 700
 701 uint gr_opengl1_lock()
 702 {
 703         return 1;
 704 }
 705
 706 void gr_opengl1_unlock()
 707 {
 708 }
 709
 710 void gr_opengl1_zbias(int bias)
 711 {
 712         if (bias) {
 713                 glEnable(GL_POLYGON_OFFSET_FILL);
 714                 glPolygonOffset(0.0f, GLfloat(-bias));
 715         } else {
 716                 glDisable(GL_POLYGON_OFFSET_FILL);
 717         }
 718 }
 719
 720 void gr_opengl1_set_viewport(int width, int height)
 721 {
 722         int w, h, x, y;
 723
 724         float ratio = gr_screen.max_w / i2fl(gr_screen.max_h);
 725
 726         w = width;
 727         h = fl2i((width / ratio) + 0.5f);
 728
 729         if (h > height) {
 730                 h = height;
 731                 w = fl2i((height * ratio) + 0.5f);
 732         }
 733
 734         x = (width - w) / 2;
 735         y = (height - h) / 2;
 736
 737         GL_viewport_x = x;
 738         GL_viewport_y = y;
 739         GL_viewport_w = w;
 740         GL_viewport_h = h;
 741         GL_viewport_scale_w = w / i2fl(gr_screen.max_w);
 742         GL_viewport_scale_h = h / i2fl(gr_screen.max_h);
 743
 744         glViewport(GL_viewport_x, GL_viewport_y, GL_viewport_w, GL_viewport_h);
 745
 746         glMatrixMode(GL_PROJECTION);
 747         glLoadIdentity();
 748         glOrtho(0, GL_viewport_w, GL_viewport_h, 0, 0.0, 1.0);
 749         glMatrixMode(GL_MODELVIEW);
 750         glLoadIdentity();
 751         glScalef(GL_viewport_scale_w, GL_viewport_scale_h, 1.0f);
 752
 753         // free mouse cursor storage, since the size might have changed
 754         if (Gr_opengl_mouse_saved_data) {
 755                 free(Gr_opengl_mouse_saved_data);
 756                 Gr_opengl_mouse_saved_data = NULL;
 757         }
 758 }