LUMINANCE_ALPHA = GL_LUMINANCE_ALPHA,
LUMINANCE_ALPHA8 = GL_LUMINANCE8_ALPHA8,
LUMINANCE_ALPHA16F = GL_LUMINANCE_ALPHA16F_ARB,
LUMINANCE_ALPHA = GL_LUMINANCE_ALPHA,
LUMINANCE_ALPHA8 = GL_LUMINANCE8_ALPHA8,
LUMINANCE_ALPHA16F = GL_LUMINANCE_ALPHA16F_ARB,