lighting: always take alpha from diffuse color #85
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This is a fixup of commit 470b027: the OpenGL spec says that the alpha value resulting from the raster operations is always the alpha value of the diffuse colour. We compute it in the second TEV stage, so modify the TEV operation to always use GX_CA_RASA without mixing it with any other value.
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This is a fixup of commit 470b027: the OpenGL spec says that the alpha value resulting from the raster operations is always the alpha value of the diffuse colour. We compute it in the second TEV stage, so modify the TEV operation to always use GX_CA_RASA without mixing it with any other value.