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Corrected a comment about how the DOT3 hardware works in the R200.

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This commit is contained in:
Ian Romanick 2004-01-22 16:25:02 +00:00
parent 03166f73f3
commit 004d71f554
1 changed files with 4 additions and 4 deletions
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8
src/mesa/drivers/dri/r200/r200_texstate.c
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@ -1038,10 +1038,10 @@ static GLboolean r200UpdateTextureEnv( GLcontext *ctx, int unit )
case GL_DOT3_RGBA:
/* DOT3 works differently on R200 than on R100. On R100, just
* setting the DOT3 mode did everything for you. On R200, the
* driver has to enable the biasing (the -0.5 in the combine
* equation), and it has add the 4x scale factor. The hardware
* only supports up to 8x in the post filter, so 2x part of it
* happens on the inputs going into the combiner.
* driver has to enable the biasing and scale in the inputs to
* put them in the proper [-1,1] range. This is what the 4x and
* the -0.5 in the DOT3 spec do. The post-scale is then set
* normally.
*/
RGBshift++;