From ac27b511bf16b7853e9a744f16a1156685148f38 Mon Sep 17 00:00:00 2001 From: Alex Szpakowski Date: Wed, 6 May 2015 12:54:51 -0300 Subject: [PATCH] Fixed SDL_GL_GetAttribute queries for framebuffer component sizes in Core Profile OpenGL contexts. Fixes bugzilla #2060. --- src/video/SDL_video.c | 100 ++++++++++++++++++++++++++++++------------ 1 file changed, 72 insertions(+), 28 deletions(-) diff --git a/src/video/SDL_video.c b/src/video/SDL_video.c index cab98d9de..afe92d015 100644 --- a/src/video/SDL_video.c +++ b/src/video/SDL_video.c @@ -2793,19 +2793,37 @@ int SDL_GL_GetAttribute(SDL_GLattr attr, int *value) { #if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES || SDL_VIDEO_OPENGL_ES2 - void (APIENTRY * glGetIntegervFunc) (GLenum pname, GLint * params); - GLenum(APIENTRY * glGetErrorFunc) (void); + void (APIENTRY *glGetIntegervFunc) (GLenum pname, GLint * params); + GLenum (APIENTRY *glGetErrorFunc) (void); GLenum attrib = 0; GLenum error = 0; + /* + * Some queries in Core Profile desktop OpenGL 3+ contexts require + * glGetFramebufferAttachmentParameteriv instead of glGetIntegerv. Note that + * the enums we use for the former function don't exist in OpenGL ES 2, and + * the function itself doesn't exist prior to OpenGL 3 and OpenGL ES 2. + */ +#if SDL_VIDEO_OPENGL + const GLubyte *(APIENTRY *glGetStringFunc) (GLenum name); + void (APIENTRY *glGetFramebufferAttachmentParameterivFunc) (GLenum target, GLenum attachment, GLenum pname, GLint* params); + GLenum attachment = GL_BACK_LEFT; + GLenum attachmentattrib = 0; + + glGetStringFunc = SDL_GL_GetProcAddress("glGetString"); + if (!glGetStringFunc) { + return SDL_SetError("Failed getting OpenGL glGetString entry point"); + } +#endif + glGetIntegervFunc = SDL_GL_GetProcAddress("glGetIntegerv"); if (!glGetIntegervFunc) { - return -1; + return SDL_SetError("Failed getting OpenGL glGetIntegerv entry point"); } glGetErrorFunc = SDL_GL_GetProcAddress("glGetError"); if (!glGetErrorFunc) { - return -1; + return SDL_SetError("Failed getting OpenGL glGetError entry point"); } /* Clear value in any case */ @@ -2813,15 +2831,27 @@ SDL_GL_GetAttribute(SDL_GLattr attr, int *value) switch (attr) { case SDL_GL_RED_SIZE: +#if SDL_VIDEO_OPENGL + attachmentattrib = GL_FRAMEBUFFER_ATTACHMENT_RED_SIZE; +#endif attrib = GL_RED_BITS; break; case SDL_GL_BLUE_SIZE: +#if SDL_VIDEO_OPENGL + attachmentattrib = GL_FRAMEBUFFER_ATTACHMENT_BLUE_SIZE; +#endif attrib = GL_BLUE_BITS; break; case SDL_GL_GREEN_SIZE: +#if SDL_VIDEO_OPENGL + attachmentattrib = GL_FRAMEBUFFER_ATTACHMENT_GREEN_SIZE; +#endif attrib = GL_GREEN_BITS; break; case SDL_GL_ALPHA_SIZE: +#if SDL_VIDEO_OPENGL + attachmentattrib = GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE; +#endif attrib = GL_ALPHA_BITS; break; case SDL_GL_DOUBLEBUFFER: @@ -2836,9 +2866,17 @@ SDL_GL_GetAttribute(SDL_GLattr attr, int *value) return 0; #endif case SDL_GL_DEPTH_SIZE: +#if SDL_VIDEO_OPENGL + attachment = GL_DEPTH; + attachmentattrib = GL_FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE; +#endif attrib = GL_DEPTH_BITS; break; case SDL_GL_STENCIL_SIZE: +#if SDL_VIDEO_OPENGL + attachment = GL_STENCIL; + attachmentattrib = GL_FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE; +#endif attrib = GL_STENCIL_BITS; break; #if SDL_VIDEO_OPENGL @@ -2868,18 +2906,10 @@ SDL_GL_GetAttribute(SDL_GLattr attr, int *value) return 0; #endif case SDL_GL_MULTISAMPLEBUFFERS: -#if SDL_VIDEO_OPENGL - attrib = GL_SAMPLE_BUFFERS_ARB; -#else attrib = GL_SAMPLE_BUFFERS; -#endif break; case SDL_GL_MULTISAMPLESAMPLES: -#if SDL_VIDEO_OPENGL - attrib = GL_SAMPLES_ARB; -#else attrib = GL_SAMPLES; -#endif break; case SDL_GL_CONTEXT_RELEASE_BEHAVIOR: #if SDL_VIDEO_OPENGL @@ -2890,23 +2920,23 @@ SDL_GL_GetAttribute(SDL_GLattr attr, int *value) break; case SDL_GL_BUFFER_SIZE: { - GLint bits = 0; - GLint component; + int rsize = 0, gsize = 0, bsize = 0, asize = 0; - /* - * there doesn't seem to be a single flag in OpenGL - * for this! - */ - glGetIntegervFunc(GL_RED_BITS, &component); - bits += component; - glGetIntegervFunc(GL_GREEN_BITS, &component); - bits += component; - glGetIntegervFunc(GL_BLUE_BITS, &component); - bits += component; - glGetIntegervFunc(GL_ALPHA_BITS, &component); - bits += component; + /* There doesn't seem to be a single flag in OpenGL for this! */ + if (SDL_GL_GetAttribute(SDL_GL_RED_SIZE, &rsize) < 0) { + return -1; + } + if (SDL_GL_GetAttribute(SDL_GL_GREEN_SIZE, &gsize) < 0) { + return -1; + } + if (SDL_GL_GetAttribute(SDL_GL_BLUE_SIZE, &bsize) < 0) { + return -1; + } + if (SDL_GL_GetAttribute(SDL_GL_ALPHA_SIZE, &asize) < 0) { + return -1; + } - *value = bits; + *value = rsize + gsize + bsize + asize; return 0; } case SDL_GL_ACCELERATED_VISUAL: @@ -2965,7 +2995,21 @@ SDL_GL_GetAttribute(SDL_GLattr attr, int *value) return SDL_SetError("Unknown OpenGL attribute"); } - glGetIntegervFunc(attrib, (GLint *) value); +#if SDL_VIDEO_OPENGL + if (attachmentattrib && isAtLeastGL3((const char *) glGetStringFunc(GL_VERSION))) { + glGetFramebufferAttachmentParameterivFunc = SDL_GL_GetProcAddress("glGetFramebufferAttachmentParameteriv"); + + if (glGetFramebufferAttachmentParameterivFunc) { + glGetFramebufferAttachmentParameterivFunc(GL_FRAMEBUFFER, attachment, attachmentattrib, (GLint *) value); + } else { + return SDL_SetError("Failed getting OpenGL glGetFramebufferAttachmentParameteriv entry point"); + } + } else +#endif + { + glGetIntegervFunc(attrib, (GLint *) value); + } + error = glGetErrorFunc(); if (error != GL_NO_ERROR) { if (error == GL_INVALID_ENUM) {