glRect*
According to the spec, these calls should be identical to an invocation of `glVertex2*`, which sets the W-coordinate to 1 by default. This fixes the credits sequence rendering of Tux Racer.
border_color
Sampler2D
GLContext::frontbuffer()
glMateriali{v}
GLMat.cpp
GLMatrix.cpp
glClipPlane
glArrayElement