glCullFace() - Indicates which polygons should be discarded (culled) before they're converted to screen coords.

glHint() - this command can be used to tradeoff between speed and image quality (not ALL implementations will take the hint).
- GL_PERSPECTIVE_CORRECTION_HINT - This refers to how the color values and texture coordinates are interpolated across a primitive (linearly or perspective-correct manner).

glColorMaterial() - Technique for minimizing performance costs associated with changing material properties.

glCopyTexSubImage2D - specify a two-dimensional texture subimage with pixels from the color buffer

glColorMask -- enable and disable writing of frame buffer color components
Specify, whether red, green, blue, and alpha can or cannot be written into the frame buffer. The default values are all GL_TRUE, indicating, that the color components can be written.