Commits on Source (3)
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As explained in commit 1e721747 (in VLC4): > In case the texture format is GL_LUMINANCE, swizzle_per_tex was set to > {NULL, "xa"}. Using NULL instead of an explicit swizzle ("x") was a > small optimization to assign the texel value directly [...] > > This was possible because the texture exposes the luminance value in > its three components: (L, L, L, 1). In fact, using the luminance value in the 3 components is not equivalent (and wrong). Therefore, explicitly use the texture swizzle. Cherry-picked from 1e721747 Note: only the assignment is cherry-picked, the associated refactor is not applied to minimize code changes on VLC3.
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