llvmpipe: clean up shader pre/postamble, try to catch more early-z

Specifically, can do early-depth-test even when alpahtest or
kill-pixel are active, providing we defer the actual z write until the
final mask is avaialable.

Improves demos/fire.c especially in the case where you get close to
the trees.

1 files changed, 14 insertions, 1 deletions

diff --git a/src/gallium/drivers/llvmpipe/lp_bld_depth.h b/src/gallium/drivers/llvmpipe/lp_bld_depth.h
index 2a63bb9378..0f89668123 100644
--- a/src/gallium/drivers/llvmpipe/lp_bld_depth.h
+++ b/src/gallium/drivers/llvmpipe/lp_bld_depth.h
@@ -61,8 +61,21 @@ lp_build_depth_stencil_test(LLVMBuilderRef builder,
                             LLVMValueRef zs_src,
                             LLVMValueRef zs_dst_ptr,
                             LLVMValueRef facing,
-                            LLVMValueRef counter,
+                            LLVMValueRef *zs_value,
                             boolean do_branch);
 
+void
+lp_build_deferred_depth_write(LLVMBuilderRef builder,
+                              struct lp_type z_src_type,
+                              const struct util_format_description *format_desc,
+                              struct lp_build_mask_context *mask,
+                              LLVMValueRef zs_dst_ptr,
+                              LLVMValueRef zs_value);
+
+void
+lp_build_occlusion_count(LLVMBuilderRef builder,
+                         struct lp_type type,
+                         LLVMValueRef maskvalue,
+                         LLVMValueRef counter);
 
 #endif /* !LP_BLD_DEPTH_H */