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| ||SDL_GL_FRAMEBUFFER_SRGB_CAPABLE||requests sRGB capable visual; defaults to 0 (>= SDL 2.0.1)|| | |
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| <<Anchor(multisample)>> [[http://en.wikipedia.org/wiki/Multisample_anti-aliasing|Multisample anti-aliasing]] is a type of full screen anti-aliasing. Multipsampling defaults to off but can be turned on by setting SDL_GL_MULTISAMPLEBUFFERS to 1 and SDL_GL_MULTISAMPLESAMPLES to a value greater than 0. Typical values are 2 and 4. | <<Anchor(multisample)>> [[http://en.wikipedia.org/wiki/Multisample_anti-aliasing|Multisample anti-aliasing]] is a type of full screen anti-aliasing. Multipsampling defaults to off but can be turned on by setting SDL_GL_MULTISAMPLEBUFFERS to 1 and SDL_GL_MULTISAMPLESAMPLES to a value greater than 0. Typical values are 2 and 4. |
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| <<Anchor(OpenGL)>> SDL_GL_CONTEXT_MAJOR_VERSION and SDL_GL_CONTEXT_MINOR_VERSION are used when creating an OpenGL 3.x context. | <<Anchor(OpenGL)>> SDL_GL_CONTEXT_MAJOR_VERSION and SDL_GL_CONTEXT_MINOR_VERSION are used when creating an OpenGL 3.x context. |
SDL_GLattr
An enumeration of OpenGL configuration attributes.
Values
SDL_GL_RED_SIZE |
the minimum number of bits for the red channel of the color buffer; defaults to 3 |
SDL_GL_GREEN_SIZE |
the minimum number of bits for the green channel of the color buffer; defaults to 3 |
SDL_GL_BLUE_SIZE |
the minimum number of bits for the blue channel of the color buffer; defaults to 2 |
SDL_GL_ALPHA_SIZE |
the minimum number of bits for the alpha channel of the color buffer; defaults to 0 |
SDL_GL_BUFFER_SIZE |
the minimum number of bits for frame buffer size; defaults to 0 |
SDL_GL_DOUBLEBUFFER |
whether the output is single or double buffered; defaults to double buffering on |
SDL_GL_DEPTH_SIZE |
the minimum number of bits in the depth buffer; defaults to 16 |
SDL_GL_STENCIL_SIZE |
the minimum number of bits in the stencil buffer; defaults to 0 |
SDL_GL_ACCUM_RED_SIZE |
the minimum number of bits for the red channel of the accumulation buffer; defaults to 0 |
SDL_GL_ACCUM_GREEN_SIZE |
the minimum number of bits for the green channel of the accumulation buffer; defaults to 0 |
SDL_GL_ACCUM_BLUE_SIZE |
the minimum number of bits for the blue channel of the accumulation buffer; defaults to 0 |
SDL_GL_ACCUM_ALPHA_SIZE |
the minimum number of bits for the alpha channel of the accumulation buffer; defaults to 0 |
SDL_GL_STEREO |
whether the output is stereo 3D; defaults to off |
SDL_GL_MULTISAMPLEBUFFERS |
the number of buffers used for multisample anti-aliasing; defaults to 0; see Remarks for details |
SDL_GL_MULTISAMPLESAMPLES |
the number of samples used around the current pixel used for multisample anti-aliasing; defaults to 0; see Remarks for details |
SDL_GL_ACCELERATED_VISUAL |
set to 1 to require hardware acceleration, set to 0 to force software rendering; defaults to allow either |
SDL_GL_RETAINED_BACKING |
not used (deprecated) |
SDL_GL_CONTEXT_MAJOR_VERSION |
OpenGL context major version; see Remarks for details |
SDL_GL_CONTEXT_MINOR_VERSION |
OpenGL context minor version; see Remarks for details |
SDL_GL_CONTEXT_EGL |
set to 1 to use EGL; default is platform-dependent |
SDL_GL_CONTEXT_FLAGS |
some combination of 0 or more of elements of the SDL_GLcontextFlag enumeration; defaults to 0 |
SDL_GL_CONTEXT_PROFILE_MASK |
one of the members of the SDL_GLprofile enumeration or 0 to allow any profile; defaults to 0 |
SDL_GL_SHARE_WITH_CURRENT_CONTEXT |
OpenGL context sharing; defaults to 0 |
SDL_GL_FRAMEBUFFER_SRGB_CAPABLE |
requests sRGB capable visual; defaults to 0 (>= SDL 2.0.1) |
Code Examples
SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 8);
SDL_GL_SetAttribute(SDL_DOUBLEBUFFER, 1);
SDL_GL_CreateContext(window);
Remarks
While you can set most OpenGL attributes normally, the attributes listed above must be known before SDL creates an OpenGL context. These attributes are set and read with SDL_GL_SetAttribute() and SDL_GL_GetAttribute().
In some cases, these attributes are minimum requests; the GL does not promise to give you exactly what you asked for. It's possible to ask for a 16-bit depth buffer and get a 24-bit one instead, for example, or to ask for no stencil buffer and still have one available. Context creation should fail if the GL can't provide your requested attributes at a minimum, but you should check to see exactly what you got.
Multisample anti-aliasing is a type of full screen anti-aliasing. Multipsampling defaults to off but can be turned on by setting SDL_GL_MULTISAMPLEBUFFERS to 1 and SDL_GL_MULTISAMPLESAMPLES to a value greater than 0. Typical values are 2 and 4.
SDL_GL_CONTEXT_MAJOR_VERSION and SDL_GL_CONTEXT_MINOR_VERSION are used when creating an OpenGL 3.x context.
