svga: issue debug warning for unsupported two-sided stencil state

We only have a single stencil read mask and write mask.  Issue a
warning if different front/back values are used.  The Piglit
gl-2.0-two-sided-stencil test hits this.

Reviewed-by: Neha Bhende <[email protected]>
Reviewed-by: Charmaine Lee <[email protected]>

1 files changed, 15 insertions, 0 deletions

diff --git a/src/gallium/drivers/svga/svga_pipe_depthstencil.c b/src/gallium/drivers/svga/svga_pipe_depthstencil.c
index 1b62290446b..e5caa4b2771 100644
--- a/src/gallium/drivers/svga/svga_pipe_depthstencil.c
+++ b/src/gallium/drivers/svga/svga_pipe_depthstencil.c
@@ -172,6 +172,21 @@ svga_create_depth_stencil_state(struct pipe_context *pipe,
 
       ds->stencil_mask      = templ->stencil[1].valuemask & 0xff;
       ds->stencil_writemask = templ->stencil[1].writemask & 0xff;
+
+      if (templ->stencil[1].valuemask != templ->stencil[0].valuemask) {
+         pipe_debug_message(&svga->debug.callback, CONFORMANCE,
+                            "two-sided stencil mask not supported "
+                            "(front=0x%x, back=0x%x)",
+                            templ->stencil[0].valuemask,
+                            templ->stencil[1].valuemask);
+      }
+      if (templ->stencil[1].writemask != templ->stencil[0].writemask) {
+         pipe_debug_message(&svga->debug.callback, CONFORMANCE,
+                            "two-sided stencil writemask not supported "
+                            "(front=0x%x, back=0x%x)",
+                            templ->stencil[0].writemask,
+                            templ->stencil[1].writemask);
+      }
    }
    else {
       /* back face state is same as front-face state */