set sampler state for shadow test

1 files changed, 8 insertions, 0 deletions

diff --git a/src/mesa/state_tracker/st_atom_sampler.c b/src/mesa/state_tracker/st_atom_sampler.c
index bdc6024477..67a9159069 100644
--- a/src/mesa/state_tracker/st_atom_sampler.c
+++ b/src/mesa/state_tracker/st_atom_sampler.c
@@ -153,6 +153,14 @@ update_samplers(struct st_context *st)
 
 	 sampler.max_anisotropy = texobj->MaxAnisotropy;
 
+         /* only care about ARB_shadow, not SGI shadow */
+         if (texobj->CompareMode == GL_COMPARE_R_TO_TEXTURE) {
+            sampler.compare = 1;
+            sampler.compare_mode = PIPE_TEX_COMPARE_R_TO_TEXTURE;
+            sampler.compare_func
+               = st_compare_func_to_pipe(texobj->CompareFunc);
+         }
+
          /* XXX more sampler state here */
       }