mesa: initialize ctx->Stencil._BackFace = 1

Back-face stencil operations didn't work correctly because this value was
zero.  It needs to be 1 or 2.  The only place it's set otherwise is in
glEnable/Disable(GL_STENCIL_TEST_TWO_SIDE_EXT).

diff --git a/src/mesa/main/stencil.c b/src/mesa/main/stencil.c
index b4ea9978d874bfc858083d1db81992537285c167..6d6bbb2286b38b3b0fe8baa5c8096c50f0392e95 100644 (file)
--- a/src/mesa/main/stencil.c
+++ b/src/mesa/main/stencil.c
@@ -565,4 +565,5 @@ _mesa_init_stencil(GLcontext *ctx)
    ctx->Stencil.WriteMask[1] = ~0U;
    ctx->Stencil.WriteMask[2] = ~0U;
    ctx->Stencil.Clear = 0;
+   ctx->Stencil._BackFace = 1;
 }