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llvmpipe: Obey back writemask. 

Tested with a modified glean tstencil2 test.

NOTE: This is a candidate for stable branches.

Reviewed-by: Brian Paul <brianp@vmware.com>
This commit is contained in:
José Fonseca 2012-10-30 19:45:25 +00:00
parent 470952f751
commit f69fc36127
1 changed files with 8 additions and 2 deletions
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10
src/gallium/drivers/llvmpipe/lp_bld_depth.c
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@ -273,11 +273,17 @@ lp_build_stencil_op(struct lp_build_context *bld,
res = lp_build_select(bld, front_facing, res, back_res);
}
/* XXX what about the back-face writemask? */
if (stencil[0].writemask != 0xff) {
if (stencil[0].writemask != 0xff ||
(stencil[1].enabled && front_facing != NULL && stencil[1].writemask != 0xff)) {
/* mask &= stencil[0].writemask */
LLVMValueRef writemask = lp_build_const_int_vec(bld->gallivm, bld->type,
stencil[0].writemask);
if (stencil[1].enabled && stencil[1].writemask != stencil[0].writemask && front_facing != NULL) {
LLVMValueRef back_writemask = lp_build_const_int_vec(bld->gallivm, bld->type,
stencil[1].writemask);
writemask = lp_build_select(bld, front_facing, writemask, back_writemask);
}
mask = LLVMBuildAnd(builder, mask, writemask, "");
/* res = (res & mask) | (stencilVals & ~mask) */
res = lp_build_select_bitwise(bld, mask, res, stencilVals);