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mesa: implement texture swizzling in swrast

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And enable GL_EXT_texture_swizzle for software drivers.
This commit is contained in:
Brian Paul
2009-01-28 10:31:05 -07:00
parent 4a89e51c5f
commit 54c62ba5c3
4 changed files with 73 additions and 8 deletions
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39
src/mesa/swrast/s_fragprog.c
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@@ -32,6 +32,35 @@
#include "s_span.h"
/**
* Apply texture object's swizzle (X/Y/Z/W/0/1) to incoming 'texel'
* and return results in 'colorOut'.
*/
static INLINE void
swizzle_texel(const GLchan texel[4], GLfloat colorOut[4], GLuint swizzle)
{
if (swizzle == SWIZZLE_NOOP) {
colorOut[0] = CHAN_TO_FLOAT(texel[0]);
colorOut[1] = CHAN_TO_FLOAT(texel[1]);
colorOut[2] = CHAN_TO_FLOAT(texel[2]);
colorOut[3] = CHAN_TO_FLOAT(texel[3]);
}
else {
GLfloat vector[6];
vector[SWIZZLE_X] = CHAN_TO_FLOAT(texel[0]);
vector[SWIZZLE_Y] = CHAN_TO_FLOAT(texel[1]);
vector[SWIZZLE_Z] = CHAN_TO_FLOAT(texel[2]);
vector[SWIZZLE_W] = CHAN_TO_FLOAT(texel[3]);
vector[SWIZZLE_ZERO] = 0.0F;
vector[SWIZZLE_ONE] = 1.0F;
colorOut[0] = vector[GET_SWZ(swizzle, 0)];
colorOut[1] = vector[GET_SWZ(swizzle, 1)];
colorOut[2] = vector[GET_SWZ(swizzle, 2)];
colorOut[3] = vector[GET_SWZ(swizzle, 3)];
}
}
/**
* Fetch a texel with given lod.
* Called via machine->FetchTexelLod()
@@ -52,10 +81,7 @@ fetch_texel_lod( GLcontext *ctx, const GLfloat texcoord[4], GLfloat lambda,
swrast->TextureSample[unit](ctx, texObj, 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]);
swizzle_texel(rgba, color, texObj->_Swizzle);
}
else {
color[0] = color[1] = color[2] = color[3] = 0.0F;
@@ -97,10 +123,7 @@ fetch_texel_deriv( GLcontext *ctx, const GLfloat texcoord[4],
swrast->TextureSample[unit](ctx, texObj, 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]);
swizzle_texel(rgba, color, texObj->_Swizzle);
}
else {
color[0] = color[1] = color[2] = color[3] = 0.0F;