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         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
 119         gr_screen.gf_clear = gr_opengl1_clear;
 120
 121         gr_screen.gf_aabitmap = gr_opengl1_aabitmap;
 122         gr_screen.gf_aabitmap_ex = gr_opengl1_aabitmap_ex;
 123
 124         gr_screen.gf_rect = gr_opengl1_rect;
 125         gr_screen.gf_shade = gr_opengl1_shade;
 126         gr_screen.gf_string = gr_opengl1_string;
 127         gr_screen.gf_circle = gr_opengl1_circle;
 128
 129         gr_screen.gf_line = gr_opengl1_line;
 130         gr_screen.gf_aaline = gr_opengl1_aaline;
 131         gr_screen.gf_pixel = gr_opengl1_pixel;
 132         gr_screen.gf_scaler = gr_opengl1_scaler;
 133         gr_screen.gf_tmapper = gr_opengl1_tmapper;
 134
 135         gr_screen.gf_gradient = gr_opengl1_gradient;
 136
 137         gr_screen.gf_print_screen = gr_opengl1_print_screen;
 138
 139         gr_screen.gf_fade_in = gr_opengl1_fade_in;
 140         gr_screen.gf_fade_out = gr_opengl1_fade_out;
 141         gr_screen.gf_flash = gr_opengl1_flash;
 142
 143         gr_screen.gf_zbuffer_clear = gr_opengl1_zbuffer_clear;
 144
 145         gr_screen.gf_save_screen = gr_opengl1_save_screen;
 146         gr_screen.gf_restore_screen = gr_opengl1_restore_screen;
 147         gr_screen.gf_free_screen = gr_opengl1_free_screen;
 148
 149         gr_screen.gf_dump_frame_start = gr_opengl1_dump_frame_start;
 150         gr_screen.gf_dump_frame_stop = gr_opengl1_dump_frame_stop;
 151         gr_screen.gf_dump_frame = gr_opengl1_dump_frame;
 152
 153         gr_screen.gf_set_gamma = gr_opengl1_set_gamma;
 154
 155         gr_screen.gf_lock = gr_opengl1_lock;
 156         gr_screen.gf_unlock = gr_opengl1_unlock;
 157
 158         gr_screen.gf_fog_set = gr_opengl1_fog_set;
 159
 160         gr_screen.gf_get_region = gr_opengl1_get_region;
 161
 162         gr_screen.gf_set_cull = gr_opengl1_set_cull;
 163
 164         gr_screen.gf_cross_fade = gr_opengl1_cross_fade;
 165
 166         gr_screen.gf_preload_init = gr_opengl1_preload_init;
 167         gr_screen.gf_preload = gr_opengl1_preload;
 168
 169         gr_screen.gf_zbias = gr_opengl1_zbias;
 170
 171         gr_screen.gf_force_windowed = gr_opengl_force_windowed;
 172         gr_screen.gf_force_fullscreen = gr_opengl_force_fullscreen;
 173         gr_screen.gf_toggle_fullscreen = gr_opengl_toggle_fullscreen;
 174
 175         gr_screen.gf_set_viewport = gr_opengl1_set_viewport;
 176
 177         gr_screen.gf_activate = gr_opengl1_activate;
 178 }
 179
 180 void opengl1_init()
 181 {
 182         if (GL_one_inited) {
 183                 return;
 184         }
 185
 186         /*
 187           1 = use secondary color ext
 188           2 = use opengl linear fog
 189          */
 190         OGL_fog_mode = 2;
 191
 192         // only available with OpenGL 1.2+, must get ptr for Windows
 193         vglSecondaryColorPointer = (PFNGLSECONDARYCOLORPOINTERPROC)SDL_GL_GetProcAddress("glSecondaryColorPointer");
 194
 195         if (vglSecondaryColorPointer) {
 196                 OGL_fog_mode = 1;
 197         }
 198
 199         mprintf(("  Fog mode: %s\n", (OGL_fog_mode == 1) ? "secondary color" : "linear"));
 200
 201         glShadeModel(GL_SMOOTH);
 202         glEnable(GL_DITHER);
 203         glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
 204         glHint(GL_FOG_HINT, GL_NICEST);
 205
 206         glEnable(GL_DEPTH_TEST);
 207         glEnable(GL_BLEND);
 208
 209         glEnable(GL_TEXTURE_2D);
 210
 211         glDepthRange(0.0, 1.0);
 212
 213         glPixelStorei(GL_PACK_ALIGNMENT, 1);
 214         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 215
 216         glFlush();
 217
 218         opengl1_init_func_pointers();
 219         opengl1_tcache_init();
 220
 221         gr_opengl1_clear();
 222
 223         GL_one_inited = 1;
 224 }
 225
 226 void gr_opengl1_activate(int active)
 227 {
 228         if (active) {
 229                 GL_activate++;
 230
 231                 // don't grab key/mouse if cmdline says so or if we're fullscreen
 232         //      if(!Cmdline_no_grab && !(SDL_GetVideoSurface()->flags & SDL_FULLSCREEN)) {
 233         //              SDL_WM_GrabInput(SDL_GRAB_ON);
 234         //      }
 235         } else {
 236                 GL_deactivate++;
 237
 238                 // let go of mouse/keyboard
 239         //      SDL_WM_GrabInput(SDL_GRAB_OFF);
 240         }
 241 }
 242
 243 void gr_opengl1_clear()
 244 {
 245         glClearColor(gr_screen.current_clear_color.red / 255.0,
 246                 gr_screen.current_clear_color.green / 255.0,
 247                 gr_screen.current_clear_color.blue / 255.0, 1.0);
 248
 249         glClear( GL_COLOR_BUFFER_BIT );
 250 }
 251
 252 void gr_opengl1_flip()
 253 {
 254         if ( !GL_one_inited ) {
 255                 return;
 256         }
 257
 258         gr_reset_clip();
 259
 260         mouse_eval_deltas();
 261
 262         Gr_opengl_mouse_saved = 0;
 263
 264         if ( mouse_is_visible() )       {
 265                 int mx, my;
 266
 267                 gr_reset_clip();
 268                 mouse_get_pos( &mx, &my );
 269
 270                 gr_opengl1_save_mouse_area(mx,my,32,32);
 271
 272                 if (Gr_cursor == -1) {
 273 #ifndef NDEBUG
 274                         gr_set_color(255,255,255);
 275                         gr_line(mx, my, mx+7, my + 7);
 276                         gr_line(mx, my, mx+5, my );
 277                         gr_line(mx, my, mx, my+5);
 278 #endif
 279                 } else {
 280                         gr_set_bitmap(Gr_cursor);
 281                         gr_bitmap(mx, my);
 282                 }
 283          }
 284
 285 #ifndef NDEBUG
 286         GLenum error = GL_NO_ERROR;
 287
 288         do {
 289                 error = glGetError();
 290
 291                 if (error != GL_NO_ERROR) {
 292                         nprintf(("Warning", "!!DEBUG!! OpenGL Error: %d\n", error));
 293                 }
 294         } while (error != GL_NO_ERROR);
 295 #endif
 296
 297         SDL_GL_SwapWindow(GL_window);
 298
 299         opengl1_tcache_frame();
 300
 301         int cnt = GL_activate;
 302         if ( cnt )      {
 303                 GL_activate-=cnt;
 304                 opengl1_tcache_flush();
 305                 // gr_opengl_clip_cursor(1); /* mouse grab, see opengl_activate */
 306         }
 307
 308         cnt = GL_deactivate;
 309         if ( cnt )      {
 310                 GL_deactivate-=cnt;
 311                 // gr_opengl_clip_cursor(0);  /* mouse grab, see opengl_activate */
 312         }
 313 }
 314
 315 void gr_opengl1_set_clip(int x,int y,int w,int h)
 316 {
 317         // check for sanity of parameters
 318         if (x < 0)
 319                 x = 0;
 320         if (y < 0)
 321                 y = 0;
 322
 323         if (x >= gr_screen.max_w)
 324                 x = gr_screen.max_w - 1;
 325         if (y >= gr_screen.max_h)
 326                 y = gr_screen.max_h - 1;
 327
 328         if (x + w > gr_screen.max_w)
 329                 w = gr_screen.max_w - x;
 330         if (y + h > gr_screen.max_h)
 331                 h = gr_screen.max_h - y;
 332
 333         if (w > gr_screen.max_w)
 334                 w = gr_screen.max_w;
 335         if (h > gr_screen.max_h)
 336                 h = gr_screen.max_h;
 337
 338         gr_screen.offset_x = x;
 339         gr_screen.offset_y = y;
 340         gr_screen.clip_left = 0;
 341         gr_screen.clip_right = w-1;
 342         gr_screen.clip_top = 0;
 343         gr_screen.clip_bottom = h-1;
 344         gr_screen.clip_width = w;
 345         gr_screen.clip_height = h;
 346
 347         x = fl2i((x * GL_viewport_scale_w) + 0.5f) + GL_viewport_x;
 348         y = fl2i((y * GL_viewport_scale_h) + 0.5f) + GL_viewport_y;
 349         w = fl2i((w * GL_viewport_scale_w) + 0.5f);
 350         h = fl2i((h * GL_viewport_scale_h) + 0.5f);
 351
 352         glEnable(GL_SCISSOR_TEST);
 353         glScissor(x, GL_viewport_h-y-h, w, h);
 354 }
 355
 356 void gr_opengl1_reset_clip()
 357 {
 358         gr_screen.offset_x = 0;
 359         gr_screen.offset_y = 0;
 360         gr_screen.clip_left = 0;
 361         gr_screen.clip_top = 0;
 362         gr_screen.clip_right = gr_screen.max_w - 1;
 363         gr_screen.clip_bottom = gr_screen.max_h - 1;
 364         gr_screen.clip_width = gr_screen.max_w;
 365         gr_screen.clip_height = gr_screen.max_h;
 366
 367         glDisable(GL_SCISSOR_TEST);
 368 }
 369
 370 void gr_opengl1_print_screen(const char *filename)
 371 {
 372         char tmp[MAX_FILENAME_LEN];
 373         ubyte *buf = NULL;
 374
 375         SDL_strlcpy( tmp, filename, sizeof(tmp) );
 376         SDL_strlcat( tmp, NOX(".tga"), sizeof(tmp) );
 377
 378         buf = (ubyte*)malloc(GL_viewport_w * GL_viewport_h * 3);
 379
 380         if (buf == NULL) {
 381                 return;
 382         }
 383
 384         CFILE *f = cfopen(tmp, "wb", CFILE_NORMAL, CF_TYPE_ROOT);
 385
 386         if (f == NULL) {
 387                 free(buf);
 388                 return;
 389         }
 390
 391         // Write the TGA header
 392         cfwrite_ubyte( 0, f );  //      IDLength;
 393         cfwrite_ubyte( 0, f );  //      ColorMapType;
 394         cfwrite_ubyte( 2, f );  //      ImageType;              // 2 = 24bpp, uncompressed, 10=24bpp rle compressed
 395         cfwrite_ushort( 0, f ); // CMapStart;
 396         cfwrite_ushort( 0, f ); //      CMapLength;
 397         cfwrite_ubyte( 0, f );  // CMapDepth;
 398         cfwrite_ushort( 0, f ); //      XOffset;
 399         cfwrite_ushort( 0, f ); //      YOffset;
 400         cfwrite_ushort( (ushort)GL_viewport_w, f );     //      Width;
 401         cfwrite_ushort( (ushort)GL_viewport_h, f );     //      Height;
 402         cfwrite_ubyte( 24, f ); //PixelDepth;
 403         cfwrite_ubyte( 0, f );  //ImageDesc;
 404
 405         memset(buf, 0, GL_viewport_w * GL_viewport_h * 3);
 406
 407         glReadPixels(GL_viewport_x, GL_viewport_y, GL_viewport_w, GL_viewport_h, GL_BGR, GL_UNSIGNED_BYTE, buf);
 408
 409         cfwrite(buf, GL_viewport_w * GL_viewport_h * 3, 1, f);
 410
 411         cfclose(f);
 412
 413         free(buf);
 414 }
 415
 416 void gr_opengl1_fog_set(int fog_mode, int r, int g, int b, float fog_near, float fog_far)
 417 {
 418         SDL_assert((r >= 0) && (r < 256));
 419         SDL_assert((g >= 0) && (g < 256));
 420         SDL_assert((b >= 0) && (b < 256));
 421
 422         if (fog_mode == GR_FOGMODE_NONE) {
 423                 if (gr_screen.current_fog_mode != fog_mode) {
 424                         glDisable(GL_FOG);
 425
 426                         if (OGL_fog_mode == 1) {
 427                                 glDisable(GL_COLOR_SUM);
 428                         }
 429                 }
 430
 431                 gr_screen.current_fog_mode = fog_mode;
 432
 433                 return;
 434         }
 435
 436         if (gr_screen.current_fog_mode != fog_mode) {
 437                 glEnable(GL_FOG);
 438
 439                 if (OGL_fog_mode == 1) {
 440                         glEnable(GL_COLOR_SUM);
 441                 } else if (OGL_fog_mode == 2) {
 442                         glFogi(GL_FOG_MODE, GL_LINEAR);
 443                 }
 444
 445                 gr_screen.current_fog_mode = fog_mode;
 446         }
 447
 448         if ( (gr_screen.current_fog_color.red != r) ||
 449                         (gr_screen.current_fog_color.green != g) ||
 450                         (gr_screen.current_fog_color.blue != b) ) {
 451                 GLfloat fc[4];
 452
 453                 gr_init_color( &gr_screen.current_fog_color, r, g, b );
 454
 455                 fc[0] = (float)r/255.0;
 456                 fc[1] = (float)g/255.0;
 457                 fc[2] = (float)b/255.0;
 458                 fc[3] = 1.0;
 459
 460                 glFogfv(GL_FOG_COLOR, fc);
 461         }
 462
 463         if( (fog_near >= 0.0f) && (fog_far >= 0.0f) &&
 464                         ((fog_near != gr_screen.fog_near) ||
 465                         (fog_far != gr_screen.fog_far)) ) {
 466                 gr_screen.fog_near = fog_near;
 467                 gr_screen.fog_far = fog_far;
 468
 469                 if (OGL_fog_mode == 2) {
 470                         glFogf(GL_FOG_START, fog_near);
 471                         glFogf(GL_FOG_END, fog_far);
 472                 }
 473         }
 474 }
 475
 476 void gr_opengl1_set_cull(int cull)
 477 {
 478         if (cull) {
 479                 glEnable (GL_CULL_FACE);
 480                 glFrontFace (GL_CCW);
 481         } else {
 482                 glDisable (GL_CULL_FACE);
 483         }
 484 }
 485
 486 void gr_opengl1_zbuffer_clear(int mode)
 487 {
 488         if (mode) {
 489                 Gr_zbuffering = 1;
 490                 Gr_zbuffering_mode = GR_ZBUFF_FULL;
 491                 Gr_global_zbuffering = 1;
 492
 493                 opengl1_set_state( TEXTURE_SOURCE_NONE, ALPHA_BLEND_NONE, ZBUFFER_TYPE_FULL );
 494                 glClear ( GL_DEPTH_BUFFER_BIT );
 495         } else {
 496                 Gr_zbuffering = 0;
 497                 Gr_zbuffering_mode = GR_ZBUFF_NONE;
 498                 Gr_global_zbuffering = 0;
 499         }
 500 }
 501
 502 void gr_opengl1_fade_in(int instantaneous)
 503 {
 504         // Empty - DDOI
 505 }
 506
 507 void gr_opengl1_fade_out(int instantaneous)
 508 {
 509         // Empty - DDOI
 510 }
 511
 512 void gr_opengl1_get_region(int front, int w, int h, ubyte *data)
 513 {
 514         if (front) {
 515                 glReadBuffer(GL_FRONT);
 516         } else {
 517                 glReadBuffer(GL_BACK);
 518         }
 519
 520         opengl1_set_state(TEXTURE_SOURCE_NO_FILTERING, ALPHA_BLEND_NONE, ZBUFFER_TYPE_NONE);
 521
 522         glPixelStorei(GL_UNPACK_ROW_LENGTH, GL_viewport_w);
 523
 524         int x = GL_viewport_x;
 525         int y = (GL_viewport_y+GL_viewport_h)-h-1;
 526
 527         GLenum pxtype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
 528
 529         if (gr_screen.bytes_per_pixel == 4) {
 530                 pxtype = GL_UNSIGNED_BYTE;
 531         }
 532
 533         glReadPixels(x, y, w, h, GL_BGRA, pxtype, data);
 534
 535         glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 536 }
 537
 538 void gr_opengl1_save_mouse_area(int x, int y, int w, int h)
 539 {
 540         int x1, y1, x2, y2;
 541
 542         w = fl2i((w * GL_viewport_scale_w) + 0.5f);
 543         h = fl2i((h * GL_viewport_scale_h) + 0.5f);
 544
 545         x1 = x;
 546         y1 = y;
 547         x2 = x+w-1;
 548         y2 = y+h-1;
 549
 550         CAP(x1, 0, GL_viewport_w);
 551         CAP(x2, 0, GL_viewport_w);
 552         CAP(y1, 0, GL_viewport_h);
 553         CAP(y2, 0, GL_viewport_h);
 554
 555         Gr_opengl_mouse_saved_x = x1;
 556         Gr_opengl_mouse_saved_y = y1;
 557         Gr_opengl_mouse_saved_w = x2 - x1 + 1;
 558         Gr_opengl_mouse_saved_h = y2 - y1 + 1;
 559
 560         if ( (Gr_opengl_mouse_saved_w < 1) || (Gr_opengl_mouse_saved_h < 1) ) {
 561                 return;
 562         }
 563
 564         if (Gr_opengl_mouse_saved_data == NULL) {
 565                 Gr_opengl_mouse_saved_data = (ubyte*)malloc(w * h * gr_screen.bytes_per_pixel);
 566
 567                 if ( !Gr_opengl_mouse_saved_data ) {
 568                         return;
 569                 }
 570         }
 571
 572         opengl1_set_state(TEXTURE_SOURCE_NO_FILTERING, ALPHA_BLEND_NONE, ZBUFFER_TYPE_NONE);
 573
 574         x1 = GL_viewport_x+Gr_opengl_mouse_saved_x;
 575         y1 = (GL_viewport_y+GL_viewport_h)-Gr_opengl_mouse_saved_y-Gr_opengl_mouse_saved_h;
 576
 577         GLenum pxtype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
 578
 579         if (gr_screen.bytes_per_pixel == 4) {
 580                 pxtype = GL_UNSIGNED_BYTE;
 581         }
 582
 583         glReadBuffer(GL_BACK);
 584         glReadPixels(x1, y1, Gr_opengl_mouse_saved_w, Gr_opengl_mouse_saved_h,
 585                         GL_BGRA, pxtype, Gr_opengl_mouse_saved_data);
 586
 587         Gr_opengl_mouse_saved = 1;
 588 }
 589
 590 int gr_opengl1_save_screen()
 591 {
 592         gr_reset_clip();
 593
 594         if (Gr_saved_screen_tex) {
 595                 mprintf(( "Screen already saved!\n" ));
 596                 return -1;
 597         }
 598
 599         glGenTextures(1, &Gr_saved_screen_tex);
 600
 601         if ( !Gr_saved_screen_tex ) {
 602                 mprintf(( "Couldn't create texture for saved screen!\n" ));
 603                 return -1;
 604         }
 605
 606         opengl1_set_state(TEXTURE_SOURCE_NO_FILTERING, ALPHA_BLEND_NONE, ZBUFFER_TYPE_NONE);
 607
 608         glBindTexture(GL_TEXTURE_2D, Gr_saved_screen_tex);
 609
 610         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 611         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 612         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
 613         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
 614         glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 615
 616         glReadBuffer(GL_FRONT);
 617         glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, GL_viewport_x, GL_viewport_y,
 618                         GL_viewport_w, GL_viewport_h, 0);
 619
 620         if (Gr_opengl_mouse_saved) {
 621                 int x = Gr_opengl_mouse_saved_x;
 622                 int y = GL_viewport_h-Gr_opengl_mouse_saved_y-Gr_opengl_mouse_saved_h;
 623
 624                 GLenum pxtype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
 625
 626                 if (gr_screen.bytes_per_pixel == 4) {
 627                         pxtype = GL_UNSIGNED_BYTE;
 628                 }
 629
 630                 glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, Gr_opengl_mouse_saved_w,
 631                                 Gr_opengl_mouse_saved_h, GL_BGRA, pxtype,
 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 id)
 641 {
 642         gr_reset_clip();
 643
 644         if ( !Gr_saved_screen_tex ) {
 645                 gr_clear();
 646                 return;
 647         }
 648
 649         glBindTexture(GL_TEXTURE_2D, Gr_saved_screen_tex);
 650
 651         if (Gr_opengl_mouse_saved) {
 652                 int x = Gr_opengl_mouse_saved_x;
 653                 int y = GL_viewport_h-Gr_opengl_mouse_saved_y-Gr_opengl_mouse_saved_h;
 654
 655                 GLenum pxtype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
 656
 657                 if (gr_screen.bytes_per_pixel == 4) {
 658                         pxtype = GL_UNSIGNED_BYTE;
 659                 }
 660
 661                 glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, Gr_opengl_mouse_saved_w,
 662                                 Gr_opengl_mouse_saved_h, GL_BGRA, pxtype,
 663                                 Gr_opengl_mouse_saved_data);
 664         }
 665
 666         glMatrixMode(GL_MODELVIEW);
 667         glPushMatrix();
 668         glLoadIdentity();
 669         glScalef(1.0f, -1.0f, 1.0f);
 670
 671         int tex_coord[] = { 0, 0, 0, 1, 1, 0, 1, 1 };
 672         int ver_coord[] = { GL_viewport_x, GL_viewport_y, GL_viewport_x,
 673                         GL_viewport_h, GL_viewport_w, GL_viewport_y, GL_viewport_w,
 674                         GL_viewport_h
 675         };
 676
 677         glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 678         glEnableClientState(GL_VERTEX_ARRAY);
 679
 680         glTexCoordPointer(2, GL_INT, 0, &tex_coord);
 681         glVertexPointer(2, GL_INT, 0, &ver_coord);
 682
 683         glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 684
 685         glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 686         glDisableClientState(GL_VERTEX_ARRAY);
 687
 688         glPopMatrix();
 689
 690         glBindTexture(GL_TEXTURE_2D, 0);
 691 }
 692
 693 void gr_opengl1_free_screen(int id)
 694 {
 695         if (Gr_saved_screen_tex) {
 696                 glDeleteTextures(1, &Gr_saved_screen_tex);
 697                 Gr_saved_screen_tex = 0;
 698         }
 699 }
 700
 701 void gr_opengl1_dump_frame_start(int first_frame, int frames_between_dumps)
 702 {
 703         STUB_FUNCTION;
 704 }
 705
 706 void gr_opengl1_dump_frame_stop()
 707 {
 708         STUB_FUNCTION;
 709 }
 710
 711 void gr_opengl1_dump_frame()
 712 {
 713         STUB_FUNCTION;
 714 }
 715
 716 uint gr_opengl1_lock()
 717 {
 718         return 1;
 719 }
 720
 721 void gr_opengl1_unlock()
 722 {
 723 }
 724
 725 void gr_opengl1_zbias(int bias)
 726 {
 727         if (bias) {
 728                 glEnable(GL_POLYGON_OFFSET_FILL);
 729                 glPolygonOffset(0.0, -bias);
 730         } else {
 731                 glDisable(GL_POLYGON_OFFSET_FILL);
 732         }
 733 }
 734
 735 void gr_opengl1_set_viewport(int width, int height)
 736 {
 737         int w, h, x, y;
 738
 739         float ratio = gr_screen.max_w / i2fl(gr_screen.max_h);
 740
 741         w = width;
 742         h = i2fl((width / ratio) + 0.5f);
 743
 744         if (h > height) {
 745                 h = height;
 746                 w = i2fl((height * ratio) + 0.5f);
 747         }
 748
 749         x = (width - w) / 2;
 750         y = (height - h) / 2;
 751
 752         GL_viewport_x = x;
 753         GL_viewport_y = y;
 754         GL_viewport_w = w;
 755         GL_viewport_h = h;
 756         GL_viewport_scale_w = w / i2fl(gr_screen.max_w);
 757         GL_viewport_scale_h = h / i2fl(gr_screen.max_h);
 758
 759         glViewport(GL_viewport_x, GL_viewport_y, GL_viewport_w, GL_viewport_h);
 760
 761         glMatrixMode(GL_PROJECTION);
 762         glLoadIdentity();
 763         glOrtho(0, GL_viewport_w, GL_viewport_h, 0, 0.0, 1.0);
 764         glMatrixMode(GL_MODELVIEW);
 765         glLoadIdentity();
 766         glScalef(GL_viewport_scale_w, GL_viewport_scale_h, 1.0f);
 767 }