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 "SDL_opengl.h"
  10
  11 #include "gropengl.h"
  12 #include "gropenglinternal.h"
  13 #include "grgl1.h"
  14 #include "mouse.h"
  15 #include "bmpman.h"
  16 #include "grinternal.h"
  17 #include "osregistry.h"
  18 #include "cfile.h"
  19
  20
  21 int GL_one_inited = 0;
  22
  23
  24 static GLuint GL_stream_tex = 0;
  25 static GLuint Gr_saved_screen_tex = 0;
  26
  27 static int Gr_opengl_mouse_saved = 0;
  28 static int Gr_opengl_mouse_saved_x = 0;
  29 static int Gr_opengl_mouse_saved_y = 0;
  30 static int Gr_opengl_mouse_saved_w = 0;
  31 static int Gr_opengl_mouse_saved_h = 0;
  32 static ubyte *Gr_opengl_mouse_saved_data = NULL;
  33
  34
  35 static gr_alpha_blend GL_current_alpha_blend = (gr_alpha_blend) -1;
  36 static gr_zbuffer_type GL_current_zbuffer_type = (gr_zbuffer_type) -1;
  37
  38 void opengl1_set_state(gr_texture_source ts, gr_alpha_blend ab, gr_zbuffer_type zt)
  39 {
  40         opengl1_set_texture_state(ts);
  41
  42         if (ab != GL_current_alpha_blend) {
  43                 switch (ab) {
  44                         case ALPHA_BLEND_NONE:                  // 1*SrcPixel + 0*DestPixel
  45                                 glBlendFunc(GL_ONE, GL_ZERO);
  46                                 break;
  47                         case ALPHA_BLEND_ADDITIVE:              // 1*SrcPixel + 1*DestPixel
  48                                 glBlendFunc(GL_ONE, GL_ONE);
  49                                 break;
  50                         case ALPHA_BLEND_ALPHA_ADDITIVE:        // Alpha*SrcPixel + 1*DestPixel
  51                                 glBlendFunc(GL_SRC_ALPHA, GL_ONE);
  52                                 break;
  53                         case ALPHA_BLEND_ALPHA_BLEND_ALPHA:     // Alpha*SrcPixel + (1-Alpha)*DestPixel
  54                                 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  55                                 break;
  56                         case ALPHA_BLEND_ALPHA_BLEND_SRC_COLOR: // Alpha*SrcPixel + (1-SrcPixel)*DestPixel
  57                                 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_COLOR);
  58                                 break;
  59                         default:
  60                                 break;
  61                 }
  62
  63                 GL_current_alpha_blend = ab;
  64         }
  65
  66         if (zt != GL_current_zbuffer_type) {
  67                 switch (zt) {
  68                         case ZBUFFER_TYPE_NONE:
  69                                 glDepthFunc(GL_ALWAYS);
  70                                 glDepthMask(GL_FALSE);
  71                                 break;
  72                         case ZBUFFER_TYPE_READ:
  73                                 glDepthFunc(GL_LESS);
  74                                 glDepthMask(GL_FALSE);
  75                                 break;
  76                         case ZBUFFER_TYPE_WRITE:
  77                                 glDepthFunc(GL_ALWAYS);
  78                                 glDepthMask(GL_TRUE);
  79                                 break;
  80                         case ZBUFFER_TYPE_FULL:
  81                                 glDepthFunc(GL_LESS);
  82                                 glDepthMask(GL_TRUE);
  83                                 break;
  84                         default:
  85                                 break;
  86                 }
  87
  88                 GL_current_zbuffer_type = zt;
  89         }
  90 }
  91
  92 void opengl1_cleanup()
  93 {
  94         if ( !GL_one_inited ) {
  95                 return;
  96         }
  97
  98         gr_opengl_reset_clip();
  99         gr_opengl_clear();
 100         gr_opengl1_flip();
 101
 102         gr_opengl1_free_screen(0);
 103
 104         if (Gr_opengl_mouse_saved_data) {
 105                 free(Gr_opengl_mouse_saved_data);
 106                 Gr_opengl_mouse_saved_data = NULL;
 107         }
 108
 109         opengl1_tcache_cleanup();
 110
 111         if (GL_context) {
 112                 SDL_GL_DeleteContext(GL_context);
 113                 GL_context = NULL;
 114         }
 115
 116         GL_one_inited = 0;
 117 }
 118
 119 static void opengl1_init_func_pointers()
 120 {
 121         gr_screen.gf_flip = gr_opengl1_flip;
 122         gr_screen.gf_set_clip = gr_opengl1_set_clip;
 123         gr_screen.gf_reset_clip = gr_opengl_reset_clip;
 124
 125         gr_screen.gf_clear = gr_opengl_clear;
 126
 127         gr_screen.gf_aabitmap = gr_opengl1_aabitmap;
 128         gr_screen.gf_aabitmap_ex = gr_opengl1_aabitmap_ex;
 129
 130         gr_screen.gf_rect = gr_opengl1_rect;
 131         gr_screen.gf_shade = gr_opengl1_shade;
 132         gr_screen.gf_string = gr_opengl1_string;
 133         gr_screen.gf_circle = gr_opengl1_circle;
 134
 135         gr_screen.gf_line = gr_opengl1_line;
 136         gr_screen.gf_aaline = gr_opengl1_aaline;
 137         gr_screen.gf_pixel = gr_opengl1_pixel;
 138         gr_screen.gf_scaler = gr_opengl1_scaler;
 139         gr_screen.gf_tmapper = gr_opengl1_tmapper;
 140
 141         gr_screen.gf_gradient = gr_opengl1_gradient;
 142
 143         gr_screen.gf_print_screen = gr_opengl1_print_screen;
 144
 145         gr_screen.gf_fade_in = gr_opengl1_fade_in;
 146         gr_screen.gf_fade_out = gr_opengl1_fade_out;
 147         gr_screen.gf_flash = gr_opengl1_flash;
 148
 149         gr_screen.gf_zbuffer_clear = gr_opengl1_zbuffer_clear;
 150
 151         gr_screen.gf_save_screen = gr_opengl1_save_screen;
 152         gr_screen.gf_restore_screen = gr_opengl1_restore_screen;
 153         gr_screen.gf_free_screen = gr_opengl1_free_screen;
 154
 155         gr_screen.gf_dump_frame_start = gr_opengl1_dump_frame_start;
 156         gr_screen.gf_dump_frame_stop = gr_opengl1_dump_frame_stop;
 157         gr_screen.gf_dump_frame = gr_opengl1_dump_frame;
 158
 159         gr_screen.gf_stream_start = gr_opengl1_stream_start;
 160         gr_screen.gf_stream_frame = gr_opengl1_stream_frame;
 161         gr_screen.gf_stream_stop = gr_opengl1_stream_stop;
 162
 163         gr_screen.gf_set_gamma = gr_opengl1_set_gamma;
 164
 165         gr_screen.gf_lock = gr_opengl_lock;
 166         gr_screen.gf_unlock = gr_opengl_unlock;
 167
 168         gr_screen.gf_fog_set = gr_opengl1_fog_set;
 169
 170         gr_screen.gf_get_region = gr_opengl1_get_region;
 171
 172         gr_screen.gf_set_cull = gr_opengl_set_cull;
 173
 174         gr_screen.gf_cross_fade = gr_opengl1_cross_fade;
 175
 176         gr_screen.gf_preload_init = gr_opengl1_preload_init;
 177         gr_screen.gf_preload = gr_opengl1_preload;
 178
 179         gr_screen.gf_zbias = gr_opengl_zbias;
 180
 181         gr_screen.gf_set_viewport = gr_opengl1_set_viewport;
 182
 183         gr_screen.gf_activate = gr_opengl_activate;
 184
 185         gr_screen.gf_release_texture = gr_opengl1_release_texture;
 186 }
 187
 188 int opengl1_init()
 189 {
 190         if (GL_one_inited) {
 191                 return 1;
 192         }
 193
 194         GL_one_inited = 1;
 195
 196         SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, 0);
 197         SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 1);
 198         SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
 199
 200         GL_context = SDL_GL_CreateContext(GL_window);
 201
 202         if ( !GL_context ) {
 203                 opengl1_cleanup();
 204                 return 0;
 205         }
 206
 207         mprintf(("  Vendor   : %s\n", glGetString(GL_VENDOR)));
 208         mprintf(("  Renderer : %s\n", glGetString(GL_RENDERER)));
 209         mprintf(("  Version  : %s\n", glGetString(GL_VERSION)));
 210
 211         // set up generic variables
 212         opengl_set_variables();
 213
 214         opengl1_init_func_pointers();
 215         opengl1_tcache_init();
 216
 217         // initial viewport setup
 218         gr_opengl1_set_viewport(gr_screen.max_w, gr_screen.max_h);
 219
 220         glShadeModel(GL_SMOOTH);
 221         glEnable(GL_DITHER);
 222         glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
 223         glHint(GL_FOG_HINT, GL_NICEST);
 224
 225         glEnable(GL_DEPTH_TEST);
 226         glEnable(GL_BLEND);
 227
 228         glEnable(GL_TEXTURE_2D);
 229
 230         glDepthRange(0.0, 1.0);
 231
 232         glPixelStorei(GL_PACK_ALIGNMENT, 1);
 233         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 234
 235         glFlush();
 236
 237         gr_opengl_clear();
 238         gr_opengl_set_cull(1);
 239
 240         return 1;
 241 }
 242
 243 void gr_opengl1_flip()
 244 {
 245         if ( !GL_one_inited ) {
 246                 return;
 247         }
 248
 249         gr_opengl_reset_clip();
 250
 251         mouse_eval_deltas();
 252
 253         Gr_opengl_mouse_saved = 0;
 254
 255         if ( mouse_is_visible() ) {
 256                 int mx, my;
 257
 258                 mouse_get_pos( &mx, &my );
 259
 260                 gr_opengl1_save_mouse_area(mx, my, 32, 32);
 261
 262                 float u_scale, v_scale;
 263
 264                 if ( opengl1_tcache_set(Gr_cursor, TCACHE_TYPE_BITMAP_INTERFACE, &u_scale, &v_scale) ) {
 265                         opengl1_set_state(TEXTURE_SOURCE_DECAL, ALPHA_BLEND_ALPHA_BLEND_ALPHA, ZBUFFER_TYPE_NONE);
 266
 267                         int bw, bh;
 268                         bm_get_info(Gr_cursor, &bw, &bh);
 269
 270                         int x = mx;
 271                         int y = my;
 272                         int w = mx + bw;
 273                         int h = my + bh;
 274
 275                         const float tex_coord[] = { 0.0f, 0.0f, 0.0f, 1.0f * v_scale,
 276                                                                                 1.0f * u_scale, 0.0f, 1.0f * u_scale,
 277                                                                                 1.0f * v_scale };
 278                         const int ver_coord[] = { x, y, x, h, w, y, w, h };
 279
 280                         glColor4ub(255, 255, 255, 255);
 281
 282                         glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 283                         glEnableClientState(GL_VERTEX_ARRAY);
 284
 285                         glTexCoordPointer(2, GL_FLOAT, 0, &tex_coord);
 286                         glVertexPointer(2, GL_INT, 0, &ver_coord);
 287
 288                         glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 289
 290                         glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 291                         glDisableClientState(GL_VERTEX_ARRAY);
 292                 }
 293 #ifndef NDEBUG
 294                 else {
 295                         gr_set_color(255,255,255);
 296                         gr_opengl1_line(mx, my, mx+7, my + 7);
 297                         gr_opengl1_line(mx, my, mx+5, my );
 298                         gr_opengl1_line(mx, my, mx, my+5);
 299                 }
 300 #endif
 301          }
 302
 303 #ifndef NDEBUG
 304         GLenum error = glGetError();
 305
 306         if (error != GL_NO_ERROR) {
 307                 mprintf(("!!DEBUG!! OpenGL Error: %d\n", error));
 308         }
 309 #endif
 310
 311         SDL_GL_SwapWindow(GL_window);
 312
 313         glClear(GL_COLOR_BUFFER_BIT);
 314
 315         opengl1_tcache_frame();
 316
 317         int cnt = GL_activate;
 318
 319         if (cnt) {
 320                 GL_activate -= cnt;
 321                 opengl1_tcache_flush();
 322         }
 323
 324         cnt = GL_deactivate;
 325
 326         if (cnt) {
 327                 GL_deactivate -= cnt;
 328         }
 329 }
 330
 331 void gr_opengl1_set_clip(int x, int y, int w, int h)
 332 {
 333         // check for sanity of parameters
 334         CAP(x, 0, gr_screen.max_w - 1);
 335         CAP(y, 0, gr_screen.max_h - 1);
 336         CAP(w, 0, gr_screen.max_w - x);
 337         CAP(h, 0, gr_screen.max_h - y);
 338
 339         gr_screen.offset_x = x;
 340         gr_screen.offset_y = y;
 341         gr_screen.clip_left = 0;
 342         gr_screen.clip_right = w-1;
 343         gr_screen.clip_top = 0;
 344         gr_screen.clip_bottom = h-1;
 345         gr_screen.clip_width = w;
 346         gr_screen.clip_height = h;
 347
 348         x = fl2i((x * GL_viewport_scale_w) + 0.5f) + GL_viewport_x;
 349         y = fl2i((y * GL_viewport_scale_h) + 0.5f) + GL_viewport_y;
 350         w = fl2i((w * GL_viewport_scale_w) + 0.5f);
 351         h = fl2i((h * GL_viewport_scale_h) + 0.5f);
 352
 353         glEnable(GL_SCISSOR_TEST);
 354         glScissor(x, GL_viewport_h-y-h, w, h);
 355 }
 356
 357 void gr_opengl1_fog_set(int fog_mode, int r, int g, int b, float fog_near, float fog_far)
 358 {
 359         SDL_assert((r >= 0) && (r < 256));
 360         SDL_assert((g >= 0) && (g < 256));
 361         SDL_assert((b >= 0) && (b < 256));
 362
 363         if (fog_mode == GR_FOGMODE_NONE) {
 364                 if (gr_screen.current_fog_mode != fog_mode) {
 365                         glDisable(GL_FOG);
 366                 }
 367
 368                 gr_screen.current_fog_mode = fog_mode;
 369
 370                 return;
 371         }
 372
 373         if (gr_screen.current_fog_mode != fog_mode) {
 374                 glEnable(GL_FOG);
 375                 glFogi(GL_FOG_MODE, GL_LINEAR);
 376
 377                 gr_screen.current_fog_mode = fog_mode;
 378         }
 379
 380         if ( (gr_screen.current_fog_color.red != r) ||
 381                         (gr_screen.current_fog_color.green != g) ||
 382                         (gr_screen.current_fog_color.blue != b) ) {
 383                 gr_init_color( &gr_screen.current_fog_color, r, g, b );
 384
 385                 GLfloat fc[4];
 386
 387                 fc[0] = r / 255.0f;
 388                 fc[1] = g / 255.0f;
 389                 fc[2] = b / 255.0f;
 390                 fc[3] = 1.0f;
 391
 392                 glFogfv(GL_FOG_COLOR, fc);
 393         }
 394
 395         if( (fog_near >= 0.0f) && (fog_far >= 0.0f) &&
 396                         ((fog_near != gr_screen.fog_near) ||
 397                         (fog_far != gr_screen.fog_far)) ) {
 398                 gr_screen.fog_near = fog_near;
 399                 gr_screen.fog_far = fog_far;
 400
 401                 glFogf(GL_FOG_START, fog_near);
 402                 glFogf(GL_FOG_END, fog_far);
 403         }
 404 }
 405
 406 void gr_opengl1_zbuffer_clear(int mode)
 407 {
 408         if (mode) {
 409                 Gr_zbuffering = 1;
 410                 Gr_zbuffering_mode = GR_ZBUFF_FULL;
 411                 Gr_global_zbuffering = 1;
 412
 413                 opengl1_set_state( TEXTURE_SOURCE_NONE, ALPHA_BLEND_NONE, ZBUFFER_TYPE_FULL );
 414                 glClear ( GL_DEPTH_BUFFER_BIT );
 415         } else {
 416                 Gr_zbuffering = 0;
 417                 Gr_zbuffering_mode = GR_ZBUFF_NONE;
 418                 Gr_global_zbuffering = 0;
 419         }
 420 }
 421
 422 void gr_opengl1_print_screen(const char *filename)
 423 {
 424         char tmp[MAX_FILENAME_LEN];
 425         ubyte *buf = NULL;
 426
 427         SDL_strlcpy( tmp, filename, SDL_arraysize(tmp) );
 428         SDL_strlcat( tmp, NOX(".tga"), SDL_arraysize(tmp) );
 429
 430         buf = (ubyte*)malloc(GL_viewport_w * GL_viewport_h * 3);
 431
 432         if (buf == NULL) {
 433                 return;
 434         }
 435
 436         CFILE *f = cfopen(tmp, "wb", CFILE_NORMAL, CF_TYPE_ROOT);
 437
 438         if (f == NULL) {
 439                 free(buf);
 440                 return;
 441         }
 442
 443         // Write the TGA header
 444         cfwrite_ubyte( 0, f );  //      IDLength;
 445         cfwrite_ubyte( 0, f );  //      ColorMapType;
 446         cfwrite_ubyte( 2, f );  //      ImageType;              // 2 = 24bpp, uncompressed, 10=24bpp rle compressed
 447         cfwrite_ushort( 0, f ); // CMapStart;
 448         cfwrite_ushort( 0, f ); //      CMapLength;
 449         cfwrite_ubyte( 0, f );  // CMapDepth;
 450         cfwrite_ushort( 0, f ); //      XOffset;
 451         cfwrite_ushort( 0, f ); //      YOffset;
 452         cfwrite_ushort( (ushort)GL_viewport_w, f );     //      Width;
 453         cfwrite_ushort( (ushort)GL_viewport_h, f );     //      Height;
 454         cfwrite_ubyte( 24, f ); //PixelDepth;
 455         cfwrite_ubyte( 0, f );  //ImageDesc;
 456
 457         memset(buf, 0, GL_viewport_w * GL_viewport_h * 3);
 458
 459         glReadBuffer(GL_FRONT);
 460
 461         glReadPixels(GL_viewport_x, GL_viewport_y, GL_viewport_w, GL_viewport_h, GL_BGR, GL_UNSIGNED_BYTE, buf);
 462
 463         cfwrite(buf, GL_viewport_w * GL_viewport_h * 3, 1, f);
 464
 465         cfclose(f);
 466
 467         free(buf);
 468 }
 469
 470 void gr_opengl1_fade_in(int instantaneous)
 471 {
 472         // Empty - DDOI
 473 }
 474
 475 void gr_opengl1_fade_out(int instantaneous)
 476 {
 477         // Empty - DDOI
 478 }
 479
 480 void gr_opengl1_get_region(int front, int w, int h, ubyte *data)
 481 {
 482         opengl1_set_state(TEXTURE_SOURCE_NO_FILTERING, ALPHA_BLEND_NONE, ZBUFFER_TYPE_NONE);
 483
 484         GLenum pxtype = GL_UNSIGNED_SHORT_5_5_5_1;
 485
 486         if (gr_screen.bytes_per_pixel == 4) {
 487                 pxtype = GL_UNSIGNED_BYTE;
 488         }
 489
 490         glReadBuffer( (front) ? GL_FRONT : GL_BACK );
 491
 492         glReadPixels(GL_viewport_x, (GL_viewport_y+GL_viewport_h)-h-1, w, h, GL_RGBA, pxtype, data);
 493 }
 494
 495 void gr_opengl1_save_mouse_area(int x, int y, int w, int h)
 496 {
 497         int x1, y1, x2, y2;
 498
 499         if (Gr_saved_screen_tex) {
 500                 // already saved, don't need it again
 501                 return;
 502         }
 503
 504         w = fl2i((w * GL_viewport_scale_w) + 0.5f);
 505         h = fl2i((h * GL_viewport_scale_h) + 0.5f);
 506
 507         x1 = x;
 508         y1 = y;
 509         x2 = x+w-1;
 510         y2 = y+h-1;
 511
 512         CAP(x1, 0, GL_viewport_w);
 513         CAP(x2, 0, GL_viewport_w);
 514         CAP(y1, 0, GL_viewport_h);
 515         CAP(y2, 0, GL_viewport_h);
 516
 517         Gr_opengl_mouse_saved_x = x1;
 518         Gr_opengl_mouse_saved_y = y1;
 519         Gr_opengl_mouse_saved_w = x2 - x1 + 1;
 520         Gr_opengl_mouse_saved_h = y2 - y1 + 1;
 521
 522         if ( (Gr_opengl_mouse_saved_w < 1) || (Gr_opengl_mouse_saved_h < 1) ) {
 523                 return;
 524         }
 525
 526         if (Gr_opengl_mouse_saved_data == NULL) {
 527                 Gr_opengl_mouse_saved_data = (ubyte*)malloc(w * h * 3);
 528
 529                 if ( !Gr_opengl_mouse_saved_data ) {
 530                         return;
 531                 }
 532         }
 533
 534         x1 = GL_viewport_x+Gr_opengl_mouse_saved_x;
 535         y1 = (GL_viewport_y+GL_viewport_h)-Gr_opengl_mouse_saved_y-Gr_opengl_mouse_saved_h;
 536
 537         glReadBuffer(GL_BACK);
 538
 539         glReadPixels(x1, y1, Gr_opengl_mouse_saved_w, Gr_opengl_mouse_saved_h,
 540                         GL_RGB, GL_UNSIGNED_BYTE, Gr_opengl_mouse_saved_data);
 541
 542         Gr_opengl_mouse_saved = 1;
 543 }
 544
 545 int gr_opengl1_save_screen()
 546 {
 547         gr_opengl_reset_clip();
 548
 549         if (Gr_saved_screen_tex) {
 550                 mprintf(( "Screen already saved!\n" ));
 551                 return -1;
 552         }
 553
 554         glGenTextures(1, &Gr_saved_screen_tex);
 555
 556         if ( !Gr_saved_screen_tex ) {
 557                 mprintf(( "Couldn't create texture for saved screen!\n" ));
 558                 return -1;
 559         }
 560
 561         glBindTexture(GL_TEXTURE_2D, Gr_saved_screen_tex);
 562
 563         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 564         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 565         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
 566         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
 567         glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 568
 569         glReadBuffer(GL_FRONT);
 570
 571         glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, GL_viewport_x, GL_viewport_y,
 572                         GL_viewport_w, GL_viewport_h, 0);
 573
 574         if (Gr_opengl_mouse_saved) {
 575                 int x = Gr_opengl_mouse_saved_x;
 576                 int y = GL_viewport_h-Gr_opengl_mouse_saved_y-Gr_opengl_mouse_saved_h;
 577
 578                 glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, Gr_opengl_mouse_saved_w,
 579                                 Gr_opengl_mouse_saved_h, GL_RGB, GL_UNSIGNED_BYTE,
 580                                 Gr_opengl_mouse_saved_data);
 581         }
 582
 583         glBindTexture(GL_TEXTURE_2D, 0);
 584
 585         return 0;
 586 }
 587
 588 void gr_opengl1_restore_screen(int)
 589 {
 590         gr_opengl_reset_clip();
 591
 592         if ( !Gr_saved_screen_tex ) {
 593                 gr_opengl_clear();
 594                 return;
 595         }
 596
 597         int x = 0;
 598         int y = 0;
 599         int w = fl2i(GL_viewport_w / GL_viewport_scale_w + 0.5f);
 600         int h = fl2i(GL_viewport_h / GL_viewport_scale_h + 0.5f);
 601
 602         const int tex_coord[] = { 0, 1, 0, 0, 1, 1, 1, 0 };     // y-flipped
 603         const int ver_coord[] = { x, y, x, h, w, y, w, h };
 604
 605         glColor4ub(255, 255, 255, 255);
 606
 607         glBindTexture(GL_TEXTURE_2D, Gr_saved_screen_tex);
 608
 609         opengl1_set_state(TEXTURE_SOURCE_NO_FILTERING, ALPHA_BLEND_NONE, ZBUFFER_TYPE_NONE);
 610
 611         glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 612         glEnableClientState(GL_VERTEX_ARRAY);
 613
 614         glTexCoordPointer(2, GL_INT, 0, &tex_coord);
 615         glVertexPointer(2, GL_INT, 0, &ver_coord);
 616
 617         glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 618
 619         glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 620         glDisableClientState(GL_VERTEX_ARRAY);
 621
 622         glBindTexture(GL_TEXTURE_2D, 0);
 623 }
 624
 625 void gr_opengl1_free_screen(int)
 626 {
 627         if (Gr_saved_screen_tex) {
 628                 glDeleteTextures(1, &Gr_saved_screen_tex);
 629                 Gr_saved_screen_tex = 0;
 630         }
 631 }
 632
 633 void gr_opengl1_dump_frame_start(int first_frame, int frames_between_dumps)
 634 {
 635         STUB_FUNCTION;
 636 }
 637
 638 void gr_opengl1_dump_frame_stop()
 639 {
 640         STUB_FUNCTION;
 641 }
 642
 643 void gr_opengl1_dump_frame()
 644 {
 645         STUB_FUNCTION;
 646 }
 647
 648 static int GL_stream_w = 0;
 649 static int GL_stream_h = 0;
 650 static bool GL_stream_scale = false;
 651 static float GL_stream_scale_by = 1.0f;
 652
 653 static rb_t GL_stream[4];
 654
 655 void gr_opengl1_stream_start(int x, int y, int w, int h)
 656 {
 657         if (GL_stream_tex) {
 658                 return;
 659         }
 660
 661         if (gr_screen.use_sections) {
 662                 mprintf(("GR_STREAM: Bitmap sections not supported\n"));
 663                 return;
 664         }
 665
 666         int tex_w = next_pow2(w);
 667         int tex_h = next_pow2(h);
 668
 669         glGenTextures(1, &GL_stream_tex);
 670
 671         glBindTexture(GL_TEXTURE_2D, GL_stream_tex);
 672
 673         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 674         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 675         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 676         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 677
 678         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, tex_w, tex_h, 0, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1, NULL);
 679
 680         glBindTexture(GL_TEXTURE_2D, 0);
 681
 682         uint scale = os_config_read_uint("Video", "ScaleMovies", 1);
 683
 684         if (scale) {
 685                 GL_stream_scale = true;
 686                 GL_stream_scale_by = GL_viewport_w / i2fl(w);
 687         } else {
 688                 GL_stream_scale = false;
 689         }
 690
 691         int sx, sy;
 692
 693         if (x < 0) {
 694                 sx = scale ? 0 : ((gr_screen.max_w - w) / 2);
 695         } else {
 696                 sx = x;
 697         }
 698
 699         if (y < 0) {
 700                 sy = scale ? ((480 - h) / 2) : ((gr_screen.max_h - h) / 2);
 701         } else {
 702                 sy = y;
 703         }
 704
 705         GL_stream_w = w;
 706         GL_stream_h = h;
 707
 708         GL_stream[0].x = i2fl(sx);
 709         GL_stream[0].y = i2fl(sy);
 710         GL_stream[0].u = 0.0f;
 711         GL_stream[0].v = 0.0f;
 712
 713         GL_stream[1].x = i2fl(sx);
 714         GL_stream[1].y = i2fl(sy + h);
 715         GL_stream[1].u = 0.0f;
 716         GL_stream[1].v = i2fl(h) / i2fl(tex_h);
 717
 718         GL_stream[2].x = i2fl(sx + w);
 719         GL_stream[2].y = i2fl(sy);
 720         GL_stream[2].u = i2fl(w) / i2fl(tex_w);
 721         GL_stream[2].v = 0.0f;
 722
 723         GL_stream[3].x = i2fl(sx + w);
 724         GL_stream[3].y = i2fl(sy + h);
 725         GL_stream[3].u = i2fl(w) / i2fl(tex_w);
 726         GL_stream[3].v = i2fl(h) / i2fl(tex_h);
 727
 728         glDisable(GL_DEPTH_TEST);
 729 }
 730
 731 void gr_opengl1_stream_frame(ubyte *frame)
 732 {
 733         if ( !GL_stream_tex ) {
 734                 return;
 735         }
 736
 737         glEnableClientState(GL_VERTEX_ARRAY);
 738         glVertexPointer(2, GL_FLOAT, sizeof(rb_t), &GL_stream[0].x);
 739
 740         glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 741         glTexCoordPointer(2, GL_FLOAT, sizeof(rb_t), &GL_stream[0].u);
 742
 743         glBindTexture(GL_TEXTURE_2D, GL_stream_tex);
 744
 745         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, GL_stream_w, GL_stream_h, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1, frame);
 746
 747         if (GL_stream_scale) {
 748                 glPushMatrix();
 749                 glLoadIdentity();
 750                 glScalef(GL_stream_scale_by, GL_stream_scale_by, 1.0f);
 751         }
 752
 753         glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 754
 755         if (GL_stream_scale) {
 756                 glPopMatrix();
 757         }
 758
 759         glBindTexture(GL_TEXTURE_2D, 0);
 760
 761         glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 762         glDisableClientState(GL_VERTEX_ARRAY);
 763 }
 764
 765 void gr_opengl1_stream_stop()
 766 {
 767         if (GL_stream_tex) {
 768                 glBindTexture(GL_TEXTURE_2D, 0);
 769                 glDeleteTextures(1, &GL_stream_tex);
 770                 GL_stream_tex = 0;
 771
 772                 glEnable(GL_DEPTH_TEST);
 773         }
 774 }
 775
 776 void gr_opengl1_set_viewport(int width, int height)
 777 {
 778         int w, h, x, y;
 779
 780         float ratio = gr_screen.max_w / i2fl(gr_screen.max_h);
 781
 782         w = width;
 783         h = fl2i((width / ratio) + 0.5f);
 784
 785         if (h > height) {
 786                 h = height;
 787                 w = fl2i((height * ratio) + 0.5f);
 788         }
 789
 790         x = (width - w) / 2;
 791         y = (height - h) / 2;
 792
 793         GL_viewport_x = x;
 794         GL_viewport_y = y;
 795         GL_viewport_w = w;
 796         GL_viewport_h = h;
 797         GL_viewport_scale_w = w / i2fl(gr_screen.max_w);
 798         GL_viewport_scale_h = h / i2fl(gr_screen.max_h);
 799
 800         glViewport(GL_viewport_x, GL_viewport_y, GL_viewport_w, GL_viewport_h);
 801
 802         glMatrixMode(GL_PROJECTION);
 803         glLoadIdentity();
 804         glOrtho(0, GL_viewport_w, GL_viewport_h, 0, 0.0, 1.0);
 805         glMatrixMode(GL_MODELVIEW);
 806         glLoadIdentity();
 807         glScalef(GL_viewport_scale_w, GL_viewport_scale_h, 1.0f);
 808
 809         // free mouse cursor storage, since the size might have changed
 810         if (Gr_opengl_mouse_saved_data) {
 811                 free(Gr_opengl_mouse_saved_data);
 812                 Gr_opengl_mouse_saved_data = NULL;
 813         }
 814
 815         // adjust scale factor for gr_stream (movies)
 816         if (GL_stream_tex && GL_stream_scale) {
 817                 GL_stream_scale_by = GL_viewport_w / i2fl(GL_stream_w);
 818         }
 819 }