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comparison src/video/SDL_renderer_gl.c @ 2847:7d020441fa81

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Don't hardcode RECT for fragment program texture targets. Now we can generate what a given system needs when compiling the shader.
author Ryan C. Gordon <icculus@icculus.org>
date Sun, 07 Dec 2008 07:06:34 +0000
parents 3d7833d5a4be
children 8a3aa505ecba
comparison
equal deleted inserted replaced
2846:3d7833d5a4be 2847:7d020441fa81
476 476
477 477
478 #define DEBUG_PROGRAM_COMPILE 1 478 #define DEBUG_PROGRAM_COMPILE 1
479 479
480 static GLuint 480 static GLuint
481 compile_shader(GL_RenderData *data, GLenum shader_type, const char *source) 481 compile_shader(GL_RenderData *data, GLenum shader_type, const char *_code)
482 { 482 {
483 const int have_texture_rects = data->GL_ARB_texture_rectangle_supported;
484 const char *replacement = have_texture_rects ? "RECT" : "2D";
485 const size_t replacementlen = strlen(replacement);
486 const char *token = "%TEXTURETARGET%";
487 const size_t tokenlen = strlen(token);
488 char *code = NULL;
489 char *ptr = NULL;
490 GLuint program = 0;
491
492 /*
493 * The TEX instruction needs a different target depending on what we use.
494 * To handle this, we use "%TEXTURETARGET%" and replace the string before
495 * compiling the shader.
496 */
497 code = SDL_strdup(_code);
498 if (code == NULL)
499 return 0;
500
501 for (ptr = SDL_strstr(code, token); ptr; ptr = SDL_strstr(ptr+1, token)) {
502 memcpy(ptr, replacement, replacementlen);
503 memmove(ptr+replacementlen, ptr+tokenlen, strlen(ptr+tokenlen)+1);
504 }
505
483 #if DEBUG_PROGRAM_COMPILE 506 #if DEBUG_PROGRAM_COMPILE
484 printf("compiling shader:\n%s\n\n", source); 507 printf("compiling shader:\n%s\n\n", code);
485 #endif 508 #endif
486
487 GLuint program = 0;
488 509
489 data->glGetError(); /* flush any existing error state. */ 510 data->glGetError(); /* flush any existing error state. */
490 data->glGenProgramsARB(1, &program); 511 data->glGenProgramsARB(1, &program);
491 data->glBindProgramARB(shader_type, program); 512 data->glBindProgramARB(shader_type, program);
492 data->glProgramStringARB(shader_type, GL_PROGRAM_FORMAT_ASCII_ARB, 513 data->glProgramStringARB(shader_type, GL_PROGRAM_FORMAT_ASCII_ARB,
493 SDL_strlen(source), source); 514 SDL_strlen(code), code);
515
516 SDL_free(code);
494 517
495 if (data->glGetError() == GL_INVALID_OPERATION) 518 if (data->glGetError() == GL_INVALID_OPERATION)
496 { 519 {
497 #if DEBUG_PROGRAM_COMPILE 520 #if DEBUG_PROGRAM_COMPILE
498 GLint pos = 0; 521 GLint pos = 0;
532 // We need 32 bits to store the data, but each pixel is 16 bits in itself. 555 // We need 32 bits to store the data, but each pixel is 16 bits in itself.
533 // halve the coordinates to grab the correct 32 bits for the fragment. 556 // halve the coordinates to grab the correct 32 bits for the fragment.
534 "MUL work, fragment.texcoord, { 0.5, 1.0, 1.0, 1.0 };\n" 557 "MUL work, fragment.texcoord, { 0.5, 1.0, 1.0, 1.0 };\n"
535 558
536 // Sample the YUV texture. Cb, Y1, Cr, Y2, are stored x,y,z,w 559 // Sample the YUV texture. Cb, Y1, Cr, Y2, are stored x,y,z,w
537 // !!! FIXME: "RECT" needs to be "2D" if we're not using texture_rectangle extension. :/ 560 "TEX uyvy, work, texture[0], %TEXTURETARGET%;\n"
538 "TEX uyvy, work, texture[0], RECT;\n"
539 561
540 // Do subtractions (128/255, 16/255, 128/255, 16/255) 562 // Do subtractions (128/255, 16/255, 128/255, 16/255)
541 "SUB uyvy, uyvy, { 0.501960784313726, 0.06274509803922, 0.501960784313726, 0.06274509803922 };\n" 563 "SUB uyvy, uyvy, { 0.501960784313726, 0.06274509803922, 0.501960784313726, 0.06274509803922 };\n"
542 564
543 // Choose the luminance component by texcoord. 565 // Choose the luminance component by texcoord.