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My, but that was a broken way of doing things. The major issue is
that we store our data flipped based on whether we're rendering to an
FBO or to a window. By not flipping our gl_FragCoord usage based on
that (either with math or ARB_frag_coord_conventions), this caused
linear gradients to be flipped when rendering to a window. To avoid
this, pass in appropriate texcoords. And, if we're passing in
texcoords, just do the projection to the linear gradient factor on the
CPU side per vertex instead of providing a bunch of uniforms to do the
math per fragment.
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