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swrast: do texture sampling/combining in floating point

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The code's cleaner and a step toward supporting float-valued texture sampling.
Some optimizations for common cases can be added and re-enabled...
This commit is contained in:
Brian Paul
2009-03-08 13:49:57 -06:00
parent f8304bf1ed
commit de2afd8688
8 changed files with 512 additions and 779 deletions
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7
src/mesa/tnl/t_vb_program.c
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@@ -176,17 +176,12 @@ static void
vp_fetch_texel(GLcontext *ctx, const GLfloat texcoord[4], GLfloat lambda,
GLuint unit, GLfloat color[4])
{
GLchan rgba[4];
SWcontext *swrast = SWRAST_CONTEXT(ctx);
/* XXX use a float-valued TextureSample routine here!!! */
swrast->TextureSample[unit](ctx, ctx->Texture.Unit[unit]._Current,
1, (const GLfloat (*)[4]) texcoord,
&lambda, &rgba);
color[0] = CHAN_TO_FLOAT(rgba[0]);
color[1] = CHAN_TO_FLOAT(rgba[1]);
color[2] = CHAN_TO_FLOAT(rgba[2]);
color[3] = CHAN_TO_FLOAT(rgba[3]);
&lambda, (GLfloat (*)[4]) color);
}