Mesa (mesa_7_5_branch): intel: Use GL_FRONT_AND_BACK for stencil clearing.

[Eric Anholt]

Module: Mesa
Branch: mesa_7_5_branch
Commit: d9e35d51fd9bb5d67865a451d16cf61c66f16a11
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=d9e35d51fd9bb5d67865a451d16cf61c66f16a11

Author: Eric Anholt <eric at anholt.net>
Date:   Wed May 13 18:18:29 2009 -0700

intel: Use GL_FRONT_AND_BACK for stencil clearing.

This comes from a radeon-rewrite fallback fix, but may also fix stencil
clear failure when the polygon winding mode is flipped.
(cherry picked from commit d866abeffc7e4a29736fa35fb8ac09c3a28a44d6)

---

 src/mesa/drivers/dri/intel/intel_clear.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/src/mesa/drivers/dri/intel/intel_clear.c b/src/mesa/drivers/dri/intel/intel_clear.c
index eb0d890..488db2c 100644
--- a/src/mesa/drivers/dri/intel/intel_clear.c
+++ b/src/mesa/drivers/dri/intel/intel_clear.c
@@ -256,7 +256,8 @@ intel_clear_tris(GLcontext *ctx, GLbitfield mask)
       if (this_mask & BUFFER_BIT_STENCIL) {
 	 _mesa_Enable(GL_STENCIL_TEST);
 	 _mesa_StencilOp(GL_REPLACE, GL_REPLACE, GL_REPLACE);
-	 _mesa_StencilFuncSeparate(GL_FRONT, GL_ALWAYS, ctx->Stencil.Clear,
+	 _mesa_StencilFuncSeparate(GL_FRONT_AND_BACK, GL_ALWAYS,
+				   ctx->Stencil.Clear,
 				   ctx->Stencil.WriteMask[0]);
       } else {
 	 _mesa_Disable(GL_STENCIL_TEST);