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