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mesa: demystify material_attrib()

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the next commit would break this magic math

Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6946>
This commit is contained in:
Marek Olšák 2020-09-28 21:54:04 -04:00 • committed by Marge Bot
parent fc31d9b733
commit cc4afb2101
1 changed files with 14 additions and 1 deletions
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15
src/mesa/main/ffvertex_prog.c
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@ -836,7 +836,20 @@ static void build_hpos( struct tnl_program *p )
static GLuint material_attrib( GLuint side, GLuint property )
{
return (property - STATE_AMBIENT) * 2 + side;
switch (property) {
case STATE_AMBIENT:
return MAT_ATTRIB_FRONT_AMBIENT + side;
case STATE_DIFFUSE:
return MAT_ATTRIB_FRONT_DIFFUSE + side;
case STATE_SPECULAR:
return MAT_ATTRIB_FRONT_SPECULAR + side;
case STATE_EMISSION:
return MAT_ATTRIB_FRONT_EMISSION + side;
case STATE_SHININESS:
return MAT_ATTRIB_FRONT_SHININESS + side;
default:
unreachable("invalid value");
}
}