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gallium: Fix computation of Z values when not using early Z. 

This fixes the missing bitmaps in the engine and fogcoord demos.
This commit is contained in:
Brian 2008-03-28 15:22:34 -06:00
parent 5a460c7391
commit cbfe6ee5d5
1 changed files with 12 additions and 9 deletions
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21
src/gallium/drivers/softpipe/sp_quad_fs.c
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@ -113,15 +113,18 @@ shade_quad(
}
}
else {
/* copy input Z (which was interpolated by the executor) to output Z */
uint i;
for (i = 0; i < 4; i++) {
quad->outputs.depth[i] = machine->Inputs[0].xyzw[2].f[i];
/* XXX not sure the above line is always correct. The following
* might be better:
quad->outputs.depth[i] = machine->QuadPos.xyzw[2].f[i];
*/
}
/* compute Z values now, as in the quad earlyz stage */
/* XXX we should really only do this if the earlyz stage is not used */
const float fx = (float) quad->x0;
const float fy = (float) quad->y0;
const float dzdx = quad->posCoef->dadx[2];
const float dzdy = quad->posCoef->dady[2];
const float z0 = quad->posCoef->a0[2] + dzdx * fx + dzdy * fy;
quad->outputs.depth[0] = z0;
quad->outputs.depth[1] = z0 + dzdx;
quad->outputs.depth[2] = z0 + dzdy;
quad->outputs.depth[3] = z0 + dzdx + dzdy;
}
/* shader may cull fragments */