Graphics.Rendering.OpenGL.Raw.ARB.TextureSwizzle
glGetARBTextureSwizzle
gl_ARB_texture_swizzle
gl_TEXTURE_SWIZZLE_A
gl_TEXTURE_SWIZZLE_B
gl_TEXTURE_SWIZZLE_G
gl_TEXTURE_SWIZZLE_R
gl_TEXTURE_SWIZZLE_RGBA