Thanks again for the help! I'll dig around some more and see what works.
One thing I found that did work is using a stack of OpenGL commands to
directly affect the colors being drawn, but that's a clumsy solution
because it affects *all* the colors, not just specific ones. The shader
I've created uses a kind of chromakey system, where only certain colors are
replaced.
glPushAttrib(GL_TEXTURE_BIT)
glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR,
(GLfloat * 4)(*flashing_colors()))
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE)
glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB, GL_CONSTANT)
game.text_batch.draw()
glPopAttrib()
This tints everything in game.text_batch with a color supplied by the
flashing_colors() function. If I set the text color to white, it works, but
again, it isn't actually keyed to replace a single color -- and from all
I've seen, you're supposed to use shaders for this kind of functionality
anyway.
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