From: José Fonseca <jose.r.fons...@gmail.com>
Tested with a modified glean tstencil2 test.
---
src/gallium/drivers/llvmpipe/lp_bld_depth.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/src/gallium/drivers/llvmpipe/lp_bld_depth.c
b/src/gallium/drivers/llvmpipe/lp_bld_depth.c
index 8efa75c..5c3715a 100644
--- a/src/gallium/drivers/llvmpipe/lp_bld_depth.c
+++ b/src/gallium/drivers/llvmpipe/lp_bld_depth.c
@@ -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);
--
1.7.10.4
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