Graphics.Rendering.OpenGL.Raw.EXT.TextureSwizzle
glGetEXTTextureSwizzle
gl_EXT_texture_swizzle
gl_TEXTURE_SWIZZLE_A_EXT
gl_TEXTURE_SWIZZLE_B_EXT
gl_TEXTURE_SWIZZLE_G_EXT
gl_TEXTURE_SWIZZLE_RGBA_EXT
gl_TEXTURE_SWIZZLE_R_EXT