src/graphics/grgl2.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_opengles2.h"
  10
  11 #include "gropengl.h"
  12 #include "gropenglinternal.h"
  13 #include "grgl2.h"
  14 #include "2d.h"
  15 #include "mouse.h"
  16 #include "pstypes.h"
  17 #include "bmpman.h"
  18 #include "grinternal.h"
  19 #include "osregistry.h"
  20 #include "cfile.h"
  21
  22
  23 int GL_two_inited = 0;
  24
  25 bool Use_mipmaps = false;
  26
  27 static GLuint FB_texture = 0;
  28 static GLuint FB_id = 0;
  29 static GLuint FB_rb_id = 0;
  30
  31 static GLuint GL_saved_screen_tex = 0;
  32 static GLuint GL_stream_tex = 0;
  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 opengl2_set_state(gr_texture_source ts, gr_alpha_blend ab, gr_zbuffer_type zt)
  39 {
  40         opengl2_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                                 glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, 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 static void opengl2_init_func_pointers()
  93 {
  94         gr_screen.gf_flip = gr_opengl2_flip;
  95         gr_screen.gf_set_clip = gr_opengl2_set_clip;
  96         gr_screen.gf_reset_clip = gr_opengl_reset_clip;
  97
  98         gr_screen.gf_clear = gr_opengl_clear;
  99
 100         gr_screen.gf_aabitmap = gr_opengl2_aabitmap;
 101         gr_screen.gf_aabitmap_ex = gr_opengl2_aabitmap_ex;
 102
 103         gr_screen.gf_rect = gr_opengl2_rect;
 104         gr_screen.gf_shade = gr_opengl2_shade;
 105         gr_screen.gf_string = gr_opengl2_string;
 106         gr_screen.gf_circle = gr_opengl2_circle;
 107
 108         gr_screen.gf_line = gr_opengl2_line;
 109         gr_screen.gf_aaline = gr_opengl2_aaline;
 110         gr_screen.gf_pixel = gr_opengl2_pixel;
 111         gr_screen.gf_scaler = gr_opengl2_scaler;
 112         gr_screen.gf_tmapper = gr_opengl2_tmapper;
 113
 114         gr_screen.gf_gradient = gr_opengl2_gradient;
 115
 116         gr_screen.gf_print_screen = gr_opengl2_print_screen;
 117
 118         gr_screen.gf_fade_in = gr_opengl2_fade_in;
 119         gr_screen.gf_fade_out = gr_opengl2_fade_out;
 120         gr_screen.gf_flash = gr_opengl2_flash;
 121
 122         gr_screen.gf_zbuffer_clear = gr_opengl2_zbuffer_clear;
 123
 124         gr_screen.gf_save_screen = gr_opengl2_save_screen;
 125         gr_screen.gf_restore_screen = gr_opengl2_restore_screen;
 126         gr_screen.gf_free_screen = gr_opengl2_free_screen;
 127
 128         gr_screen.gf_dump_frame_start = gr_opengl2_dump_frame_start;
 129         gr_screen.gf_dump_frame_stop = gr_opengl2_dump_frame_stop;
 130         gr_screen.gf_dump_frame = gr_opengl2_dump_frame;
 131
 132         gr_screen.gf_stream_start = gr_opengl2_stream_start;
 133         gr_screen.gf_stream_frame = gr_opengl2_stream_frame;
 134         gr_screen.gf_stream_stop = gr_opengl2_stream_stop;
 135
 136         gr_screen.gf_set_gamma = gr_opengl2_set_gamma;
 137
 138         gr_screen.gf_lock = gr_opengl_lock;
 139         gr_screen.gf_unlock = gr_opengl_unlock;
 140
 141         gr_screen.gf_fog_set = gr_opengl2_fog_set;
 142
 143         gr_screen.gf_get_region = gr_opengl2_get_region;
 144
 145         gr_screen.gf_set_cull = gr_opengl_set_cull;
 146
 147         gr_screen.gf_cross_fade = gr_opengl2_cross_fade;
 148
 149         gr_screen.gf_preload_init = gr_opengl2_preload_init;
 150         gr_screen.gf_preload = gr_opengl2_preload;
 151
 152         gr_screen.gf_zbias = gr_opengl_zbias;
 153
 154         gr_screen.gf_set_viewport = gr_opengl2_set_viewport;
 155
 156         gr_screen.gf_activate = gr_opengl_activate;
 157
 158         gr_screen.gf_release_texture = gr_opengl2_release_texture;
 159 }
 160
 161 static int opengl2_create_framebuffer()
 162 {
 163         // create texture
 164         glGenTextures(1, &FB_texture);
 165         glBindTexture(GL_TEXTURE_2D, FB_texture);
 166
 167         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 168         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 169         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 170         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 171
 172         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, gr_screen.max_w, gr_screen.max_h, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
 173
 174         glBindTexture(GL_TEXTURE_2D, 0);
 175
 176         // create renderbuffer
 177         glGenRenderbuffers(1, &FB_rb_id);
 178         glBindRenderbuffer(GL_RENDERBUFFER, FB_rb_id);
 179
 180         glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, gr_screen.max_w, gr_screen.max_h);
 181
 182         glBindRenderbuffer(GL_RENDERBUFFER, 0);
 183
 184         // create framebuffer
 185         glGenFramebuffers(1, &FB_id);
 186         glBindFramebuffer(GL_FRAMEBUFFER, FB_id);
 187
 188         // attach texture and renderbuffer
 189         glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, FB_texture, 0);
 190         glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, FB_rb_id);
 191
 192         GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
 193
 194         glBindFramebuffer(GL_FRAMEBUFFER, 0);
 195
 196         if (status != GL_FRAMEBUFFER_COMPLETE) {
 197                 if (FB_texture) {
 198                         glDeleteTextures(1, &FB_texture);
 199                         FB_texture = 0;
 200                 }
 201
 202                 if (FB_rb_id) {
 203                         glDeleteRenderbuffers(1, &FB_rb_id);
 204                         FB_rb_id = 0;
 205                 }
 206
 207                 if (FB_id) {
 208                         glDeleteFramebuffers(1, &FB_id);
 209                         FB_id = 0;
 210                 }
 211
 212                 return 0;
 213         }
 214
 215         return 1;
 216 }
 217
 218 void opengl2_cleanup()
 219 {
 220         if ( !GL_two_inited ) {
 221                 return;
 222         }
 223
 224         glBindFramebuffer(GL_FRAMEBUFFER, 0);
 225
 226         if (FB_texture) {
 227                 glDeleteTextures(1, &FB_texture);
 228                 FB_texture = 0;
 229         }
 230
 231         if (FB_rb_id) {
 232                 glDeleteRenderbuffers(1, &FB_rb_id);
 233                 FB_rb_id = 0;
 234         }
 235
 236         if (FB_id) {
 237                 glDeleteFramebuffers(1, &FB_id);
 238                 FB_id = 0;
 239         }
 240
 241         opengl2_tcache_cleanup();
 242         opengl2_shader_cleanup();
 243
 244         if (GL_context) {
 245                 SDL_GL_DeleteContext(GL_context);
 246                 GL_context = NULL;
 247         }
 248
 249         GL_two_inited = 0;
 250 }
 251
 252 int opengl2_init()
 253 {
 254         if (GL_two_inited) {
 255                 return 1;
 256         }
 257
 258         GL_two_inited = 1;
 259
 260         SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
 261         SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
 262         SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
 263
 264         GL_context = SDL_GL_CreateContext(GL_window);
 265
 266         if ( !GL_context ) {
 267                 opengl2_cleanup();
 268                 return 0;
 269         }
 270
 271         mprintf(("  Vendor   : %s\n", glGetString(GL_VENDOR)));
 272         mprintf(("  Renderer : %s\n", glGetString(GL_RENDERER)));
 273         mprintf(("  Version  : %s\n", glGetString(GL_VERSION)));
 274
 275         // initial viewport setup
 276         gr_opengl2_set_viewport(gr_screen.max_w, gr_screen.max_h);
 277
 278         // set up generic variables
 279         opengl_set_variables();
 280
 281         opengl2_init_func_pointers();
 282         opengl2_tcache_init();
 283
 284         if ( !opengl2_shader_init() ) {
 285                 mprintf(("  Fallback : shader init failure!\n"));
 286                 opengl2_cleanup();
 287                 return 0;
 288         }
 289
 290         if ( !opengl2_create_framebuffer() ) {
 291                 mprintf(("  Fallback : fbo init failure!\n"));
 292                 opengl2_cleanup();
 293                 return 0;
 294         }
 295
 296         glEnable(GL_DITHER);
 297         glEnable(GL_DEPTH_TEST);
 298         glEnable(GL_BLEND);
 299         glEnable(GL_TEXTURE_2D);
 300
 301         glDepthRangef(0.0f, 1.0f);
 302
 303         glPixelStorei(GL_PACK_ALIGNMENT, 1);
 304         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 305
 306         if ( SDL_GL_ExtensionSupported("GL_OES_texture_npot") ) {
 307                 Use_mipmaps     = true;
 308         }
 309
 310         mprintf(("  Mipmaps  : %s\n", Use_mipmaps ? "Enabled" : "Disabled"));
 311
 312         glFlush();
 313
 314         gr_opengl_clear();
 315         gr_opengl_set_cull(1);
 316
 317         return 1;
 318 }
 319
 320 void gr_opengl2_flip()
 321 {
 322         if ( !GL_two_inited ) {
 323                 return;
 324         }
 325
 326         glBindFramebuffer(GL_FRAMEBUFFER, 0);
 327
 328         gr_opengl_reset_clip();
 329
 330         // set viewport to window size
 331         glViewport(GL_viewport_x, GL_viewport_y, GL_viewport_w, GL_viewport_h);
 332
 333         glClear(GL_COLOR_BUFFER_BIT);
 334
 335         {
 336                 float x = 0.0f;
 337                 float y = 0.0f;
 338                 float w = i2fl(GL_viewport_w);
 339                 float h = i2fl(GL_viewport_h);
 340
 341                 const float tex_coord[] = { 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 0.0f };
 342                 const float ver_coord[] = { x, y, x, h, w, y, w, h };
 343
 344                 opengl2_shader_use(PROG_WINDOW);
 345
 346                 glEnableVertexAttribArray(SDRI_POSITION);
 347                 glVertexAttribPointer(SDRI_POSITION, 2, GL_FLOAT, GL_FALSE, 0, &ver_coord);
 348
 349                 glEnableVertexAttribArray(SDRI_TEXCOORD);
 350                 glVertexAttribPointer(SDRI_TEXCOORD, 2, GL_FLOAT, GL_FALSE, 0, &tex_coord);
 351
 352                 glBindTexture(GL_TEXTURE_2D, FB_texture);
 353
 354                 glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 355
 356                 glBindTexture(GL_TEXTURE_2D, 0);
 357
 358                 glDisableVertexAttribArray(SDRI_TEXCOORD);
 359                 glDisableVertexAttribArray(SDRI_POSITION);
 360         }
 361
 362         mouse_eval_deltas();
 363
 364         if ( mouse_is_visible() ) {
 365                 int mx, my;
 366
 367                 mouse_get_pos(&mx, &my);
 368
 369                 if ( opengl2_tcache_set(Gr_cursor, TCACHE_TYPE_BITMAP_INTERFACE) ) {
 370                         opengl2_set_state(TEXTURE_SOURCE_DECAL, ALPHA_BLEND_ALPHA_BLEND_ALPHA, ZBUFFER_TYPE_NONE);
 371
 372                         int bw, bh;
 373                         bm_get_info(Gr_cursor, &bw, &bh);
 374
 375                         float x = i2fl(mx) * GL_viewport_scale_w;
 376                         float y = i2fl(my) * GL_viewport_scale_h;
 377                         float w = x + (bw * GL_viewport_scale_w);
 378                         float h = y + (bh * GL_viewport_scale_h);
 379
 380                         const float tex_coord[] = { 0.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f };
 381                         const float ver_coord[] = { x, y, x, h, w, y, w, h };
 382
 383                         opengl2_shader_use(PROG_WINDOW);
 384
 385                         glEnableVertexAttribArray(SDRI_POSITION);
 386                         glVertexAttribPointer(SDRI_POSITION, 2, GL_FLOAT, GL_FALSE, 0, &ver_coord);
 387
 388                         glEnableVertexAttribArray(SDRI_TEXCOORD);
 389                         glVertexAttribPointer(SDRI_TEXCOORD, 2, GL_FLOAT, GL_FALSE, 0, &tex_coord);
 390
 391                         glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 392
 393                         glDisableVertexAttribArray(SDRI_TEXCOORD);
 394                         glDisableVertexAttribArray(SDRI_POSITION);
 395                 }
 396 #ifndef NDEBUG
 397                 else {
 398                         gr_set_color(255,255,255);
 399                         gr_opengl2_line(mx, my, mx+7, my + 7);
 400                         gr_opengl2_line(mx, my, mx+5, my );
 401                         gr_opengl2_line(mx, my, mx, my+5);
 402                 }
 403 #endif
 404         }
 405
 406 #ifndef NDEBUG
 407         GLenum error = glGetError();
 408
 409         if (error != GL_NO_ERROR) {
 410                 mprintf(("!!DEBUG!! OpenGL Error: %d\n", error));
 411         }
 412 #endif
 413
 414         SDL_GL_SwapWindow(GL_window);
 415
 416         opengl2_tcache_frame();
 417
 418         glBindFramebuffer(GL_FRAMEBUFFER, FB_id);
 419
 420         // set viewport to game screen size
 421         glViewport(0, 0, gr_screen.max_w, gr_screen.max_h);
 422 }
 423
 424 void gr_opengl2_set_clip(int x, int y, int w, int h)
 425 {
 426         // check for sanity of parameters
 427         CAP(x, 0, gr_screen.max_w - 1);
 428         CAP(y, 0, gr_screen.max_h - 1);
 429         CAP(w, 0, gr_screen.max_w - x);
 430         CAP(h, 0, gr_screen.max_h - y);
 431
 432         gr_screen.offset_x = x;
 433         gr_screen.offset_y = y;
 434         gr_screen.clip_left = 0;
 435         gr_screen.clip_right = w-1;
 436         gr_screen.clip_top = 0;
 437         gr_screen.clip_bottom = h-1;
 438         gr_screen.clip_width = w;
 439         gr_screen.clip_height = h;
 440
 441         glEnable(GL_SCISSOR_TEST);
 442         glScissor(x, gr_screen.max_h-y-h, w, h);
 443 }
 444
 445 void gr_opengl2_fog_set(int fog_mode, int r, int g, int b, float fog_near, float fog_far)
 446 {
 447         gr_screen.current_fog_mode = fog_mode;
 448
 449         if (fog_mode == GR_FOGMODE_NONE) {
 450                 return;
 451         }
 452
 453         gr_screen.fog_near = fog_near;
 454         gr_screen.fog_far = fog_far;
 455
 456         gr_init_color(&gr_screen.current_fog_color, r, g, b);
 457 }
 458
 459 void gr_opengl2_zbuffer_clear(int mode)
 460 {
 461         if (mode) {
 462                 Gr_zbuffering = 1;
 463                 Gr_zbuffering_mode = GR_ZBUFF_FULL;
 464                 Gr_global_zbuffering = 1;
 465
 466                 opengl2_set_state(TEXTURE_SOURCE_NONE, ALPHA_BLEND_NONE, ZBUFFER_TYPE_FULL);
 467                 glClear(GL_DEPTH_BUFFER_BIT);
 468         } else {
 469                 Gr_zbuffering = 0;
 470                 Gr_zbuffering_mode = GR_ZBUFF_NONE;
 471                 Gr_global_zbuffering = 0;
 472         }
 473 }
 474
 475 void gr_opengl2_print_screen(const char *filename)
 476 {
 477         char tmp[MAX_FILENAME_LEN];
 478         ubyte *buf = NULL;
 479
 480         SDL_strlcpy( tmp, filename, SDL_arraysize(tmp) );
 481         SDL_strlcat( tmp, NOX(".tga"), SDL_arraysize(tmp) );
 482
 483         int b_size = gr_screen.max_w * gr_screen.max_h;
 484
 485         buf = (ubyte*)malloc(b_size * 4);
 486
 487         if (buf == NULL) {
 488                 return;
 489         }
 490
 491         CFILE *f = cfopen(tmp, "wb", CFILE_NORMAL, CF_TYPE_ROOT);
 492
 493         if (f == NULL) {
 494                 free(buf);
 495                 return;
 496         }
 497
 498         // Write the TGA header
 499         cfwrite_ubyte( 0, f );  //      IDLength;
 500         cfwrite_ubyte( 0, f );  //      ColorMapType;
 501         cfwrite_ubyte( 2, f );  //      ImageType;              // 2 = 24bpp, uncompressed, 10=24bpp rle compressed
 502         cfwrite_ushort( 0, f ); // CMapStart;
 503         cfwrite_ushort( 0, f ); //      CMapLength;
 504         cfwrite_ubyte( 0, f );  // CMapDepth;
 505         cfwrite_ushort( 0, f ); //      XOffset;
 506         cfwrite_ushort( 0, f ); //      YOffset;
 507         cfwrite_ushort( (ushort)gr_screen.max_w, f );   //      Width;
 508         cfwrite_ushort( (ushort)gr_screen.max_h, f );   //      Height;
 509         cfwrite_ubyte( 24, f ); //PixelDepth;
 510         cfwrite_ubyte( 0, f );  //ImageDesc;
 511
 512         memset(buf, 0, b_size * 4);
 513
 514         glReadPixels(0, 0, gr_screen.max_w, gr_screen.max_h, GL_RGBA, GL_UNSIGNED_BYTE, buf);
 515
 516         int b_offset = 0;
 517
 518         // convert from rgba to bgr
 519         for (int i = 0; i < (b_size * 4); i += 4) {
 520                 ubyte r = buf[i];
 521                 ubyte g = buf[i+1];
 522                 ubyte b = buf[i+2];
 523
 524                 buf[b_offset++] = b;
 525                 buf[b_offset++] = g;
 526                 buf[b_offset++] = r;
 527         }
 528
 529         cfwrite(buf, b_size * 3, 1, f);
 530
 531         cfclose(f);
 532
 533         free(buf);
 534 }
 535
 536 void gr_opengl2_fade_in(int instantaneous)
 537 {
 538
 539 }
 540
 541 void gr_opengl2_fade_out(int instantaneous)
 542 {
 543
 544 }
 545
 546 void gr_opengl2_get_region(int, int w, int h, ubyte *data)
 547 {
 548         opengl2_set_state(TEXTURE_SOURCE_NO_FILTERING, ALPHA_BLEND_NONE, ZBUFFER_TYPE_NONE);
 549
 550         glReadPixels(0, gr_screen.max_h-h-1, w, h, GL_RGBA, GL_UNSIGNED_BYTE, data);
 551 }
 552
 553 int gr_opengl2_save_screen()
 554 {
 555         gr_opengl_reset_clip();
 556
 557         if (GL_saved_screen_tex) {
 558                 mprintf(( "Screen already saved!\n" ));
 559                 return -1;
 560         }
 561
 562         glGenTextures(1, &GL_saved_screen_tex);
 563
 564         if ( !GL_saved_screen_tex ) {
 565                 mprintf(( "Couldn't create texture for saved screen!\n" ));
 566                 return -1;
 567         }
 568
 569         glBindTexture(GL_TEXTURE_2D, GL_saved_screen_tex);
 570
 571         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 572         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 573         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 574         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 575
 576         glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 0, 0,
 577                         gr_screen.max_w, gr_screen.max_h, 0);
 578
 579         glBindTexture(GL_TEXTURE_2D, 0);
 580
 581         return 0;
 582 }
 583
 584 void gr_opengl2_restore_screen(int)
 585 {
 586         gr_opengl_reset_clip();
 587
 588         if ( !GL_saved_screen_tex ) {
 589                 gr_opengl_clear();
 590                 return;
 591         }
 592
 593         float x = 0.0f;
 594         float y = 0.0f;
 595         float w = i2fl(gr_screen.max_w);
 596         float h = i2fl(gr_screen.max_h);
 597
 598         const float tex_coord[] = { 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 0.0f };   // y-flipped
 599         const float ver_coord[] = { x, y, x, h, w, y, w, h };
 600
 601         opengl2_shader_use(PROG_TEX);
 602
 603         glVertexAttrib4f(SDRI_COLOR, 1.0f, 1.0f, 1.0f, 1.0f);
 604
 605         glEnableVertexAttribArray(SDRI_POSITION);
 606         glVertexAttribPointer(SDRI_POSITION, 2, GL_FLOAT, GL_FALSE, 0, &ver_coord);
 607
 608         glEnableVertexAttribArray(SDRI_TEXCOORD);
 609         glVertexAttribPointer(SDRI_TEXCOORD, 2, GL_FLOAT, GL_FALSE, 0, &tex_coord);
 610
 611         glBindTexture(GL_TEXTURE_2D, GL_saved_screen_tex);
 612
 613         glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 614
 615         glBindTexture(GL_TEXTURE_2D, 0);
 616
 617         glDisableVertexAttribArray(SDRI_TEXCOORD);
 618         glDisableVertexAttribArray(SDRI_POSITION);
 619 }
 620
 621 void gr_opengl2_free_screen(int)
 622 {
 623         if (GL_saved_screen_tex) {
 624                 glDeleteTextures(1, &GL_saved_screen_tex);
 625                 GL_saved_screen_tex = 0;
 626         }
 627 }
 628
 629 void gr_opengl2_dump_frame_start(int first_frame, int frames_between_dumps)
 630 {
 631
 632 }
 633
 634 void gr_opengl2_dump_frame_stop()
 635 {
 636
 637 }
 638
 639 void gr_opengl2_dump_frame()
 640 {
 641
 642 }
 643
 644 static int GL_stream_w = 0;
 645 static int GL_stream_h = 0;
 646
 647 static rb_t GL_stream[4];
 648
 649 void gr_opengl2_stream_start(int x, int y, int w, int h)
 650 {
 651         if (GL_stream_tex) {
 652                 return;
 653         }
 654
 655         glGenTextures(1, &GL_stream_tex);
 656
 657         glBindTexture(GL_TEXTURE_2D, GL_stream_tex);
 658
 659         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 660         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 661         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 662         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 663
 664         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1, NULL);
 665
 666         glBindTexture(GL_TEXTURE_2D, 0);
 667
 668         uint scale = os_config_read_uint("Video", "ScaleMovies", 1);
 669
 670         int sx, sy;
 671         int sw, sh;
 672
 673         if (x < 0) {
 674                 sx = scale ? 0 : ((gr_screen.max_w - w) / 2);
 675         } else {
 676                 sx = x;
 677         }
 678
 679         float h_factor = scale ? (gr_screen.max_w / i2fl(w)) : 1.0f;
 680
 681         if (y < 0) {
 682                 sy = (gr_screen.max_h - fl2i(h * h_factor)) / 2;
 683         } else {
 684                 sy = y;
 685         }
 686
 687         GL_stream_w = w;
 688         GL_stream_h = h;
 689
 690         if (scale) {
 691                 sw = gr_screen.max_w - (sx * 2);
 692                 sh = gr_screen.max_h - (sy * 2);
 693         } else {
 694                 sw = w;
 695                 sh = h;
 696         }
 697
 698         GL_stream[0].x = i2fl(sx);
 699         GL_stream[0].y = i2fl(sy);
 700         GL_stream[0].u = 0.0f;
 701         GL_stream[0].v = 0.0f;
 702
 703         GL_stream[1].x = i2fl(sx);
 704         GL_stream[1].y = i2fl(sy + sh);
 705         GL_stream[1].u = 0.0f;
 706         GL_stream[1].v = 1.0f;
 707
 708         GL_stream[2].x = i2fl(sx + sw);
 709         GL_stream[2].y = i2fl(sy);
 710         GL_stream[2].u = 1.0f;
 711         GL_stream[2].v = 0.0f;
 712
 713         GL_stream[3].x = i2fl(sx + sw);
 714         GL_stream[3].y = i2fl(sy + sh);
 715         GL_stream[3].u = 1.0f;
 716         GL_stream[3].v = 1.0f;
 717
 718         glDisable(GL_DEPTH_TEST);
 719 }
 720
 721 void gr_opengl2_stream_frame(ubyte *frame)
 722 {
 723         if ( !GL_stream_tex ) {
 724                 return;
 725         }
 726
 727         opengl2_shader_use(PROG_TEX);
 728
 729         glVertexAttrib4f(SDRI_COLOR, 1.0f, 1.0f, 1.0f, 1.0f);
 730
 731         glEnableVertexAttribArray(SDRI_POSITION);
 732         glVertexAttribPointer(SDRI_POSITION, 2, GL_FLOAT, GL_FALSE, sizeof(rb_t), &GL_stream[0].x);
 733
 734         glEnableVertexAttribArray(SDRI_TEXCOORD);
 735         glVertexAttribPointer(SDRI_TEXCOORD, 2, GL_FLOAT, GL_FALSE, sizeof(rb_t), &GL_stream[0].u);
 736
 737         glBindTexture(GL_TEXTURE_2D, GL_stream_tex);
 738
 739         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, GL_stream_w, GL_stream_h, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1, frame);
 740
 741         glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 742
 743         glBindTexture(GL_TEXTURE_2D, 0);
 744
 745         glDisableVertexAttribArray(SDRI_TEXCOORD);
 746         glDisableVertexAttribArray(SDRI_POSITION);
 747 }
 748
 749 void gr_opengl2_stream_stop()
 750 {
 751         if (GL_stream_tex) {
 752                 glBindTexture(GL_TEXTURE_2D, 0);
 753                 glDeleteTextures(1, &GL_stream_tex);
 754                 GL_stream_tex = 0;
 755
 756                 glEnable(GL_DEPTH_TEST);
 757         }
 758 }
 759
 760 void gr_opengl2_set_viewport(int width, int height)
 761 {
 762         int w, h, x, y;
 763
 764         float ratio = gr_screen.max_w / i2fl(gr_screen.max_h);
 765
 766         w = width;
 767         h = fl2i((width / ratio) + 0.5f);
 768
 769         if (h > height) {
 770                 h = height;
 771                 w = fl2i((height * ratio) + 0.5f);
 772         }
 773
 774         x = (width - w) / 2;
 775         y = (height - h) / 2;
 776
 777         GL_viewport_x = x;
 778         GL_viewport_y = y;
 779         GL_viewport_w = w;
 780         GL_viewport_h = h;
 781         GL_viewport_scale_w = w / i2fl(gr_screen.max_w);
 782         GL_viewport_scale_h = h / i2fl(gr_screen.max_h);
 783
 784         opengl2_shader_update();
 785 }