GL_EXT_framebuffer_multisample http://www.opengl.org/registry/specs/EXT/framebuffer_multisample.txt GL_EXT_framebuffer_multisample GL_RENDERBUFFER_SAMPLES_EXT 0x8CAB GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE_EXT 0x8D56 GL_MAX_SAMPLES_EXT 0x8D57 void glRenderbufferStorageMultisampleEXT (GLenum target, GLsizei samples, GLenum internalformat, GLsizei width, GLsizei height) GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE_EXT 0x8D56 GL_MAX_SAMPLES_EXT 0x8D57