GCM commands

actually the border color function is not that important
its just to set the border color of a texture (if I remember correctly) and I'm pretty sure opengl doesn't supprt it (I'll try to check again)
anyway, its not that important because its only related to textures and it wont effect games like you think (i.e games will start because of it)

i think OpenGL supports this function(in version 1.1, is this backward compatible?). It's used as a parameter of glTexParameter. It's named GL_TEXTURE_BORDER_COLOR.

GL_TEXTURE_BORDER_COLOR
Sets a border color. params contains four values that comprise the RGBA color of the texture border. Integer color components are interpreted linearly such that the most positive integer maps to 1.0, and the most negative integer maps to -1.0. The values are clamped to the range [0, 1] when they are specified. Initially, the border color is (0, 0, 0, 0).

source: here

maybe i could implement it, but i don't know where to put this (in GLGSRender.cpp near other glTexParameteri?) and how to dispatch it from RSXThread.