Graphics.Rendering.OpenGL.Raw.SGIS.SharpenTexture
gl_LINEAR_SHARPEN_ALPHA_SGIS
gl_LINEAR_SHARPEN_COLOR_SGIS
gl_LINEAR_SHARPEN_SGIS
gl_SHARPEN_TEXTURE_FUNC_POINTS_SGIS
glGetSharpenTexFuncSGIS
glSharpenTexFuncSGIS