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@@ -3234,6 +3234,9 @@ extern SDL_DECLSPEC bool SDLCALL SDL_GL_GetAttribute(SDL_GLAttr attr, int *value
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* The OpenGL context will be created with the current states set through
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* SDL_GL_SetAttribute().
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*
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+ * The SDL_Window specified must have been created with the SDL_WINDOW_OPENGL
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+ * flag, or context creation will fail.
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+ *
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* Windows users new to OpenGL should note that, for historical reasons, GL
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* functions added after OpenGL version 1.1 are not available by default.
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* Those functions must be loaded at run-time, either with an OpenGL
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