gallivm: implement better control of per-quad/per-element/scalar lod

There's a new debug value used to disable per-quad lod optimizations
in fragment shader (ignored for vs/gs as the results are just too wrong
typically). Also trying to detect if a supplied lod value is really a
scalar (if it's coming from immediate or constant file) in which case
sampler code can use this to stay on per-quad-lod path (in fact for
explicit lod could simplify even further and use same lod for both
quads in the avx case but this is not implemented yet).
Still need to actually implement per-element lod bias (and derivatives),
and need to handle per-element lod in size queries.

v2: fix comments, prettify.

Reviewed-by: Jose Fonseca <[email protected]>

1 files changed, 9 insertions, 2 deletions

diff --git a/src/gallium/auxiliary/gallivm/lp_bld_sample.h b/src/gallium/auxiliary/gallivm/lp_bld_sample.h
index 6d8fe8890d6..6d173770da7 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_sample.h
+++ b/src/gallium/auxiliary/gallivm/lp_bld_sample.h
@@ -61,6 +61,13 @@ struct lp_derivatives
 };
 
 
+enum lp_sampler_lod_property {
+   LP_SAMPLER_LOD_SCALAR,
+   LP_SAMPLER_LOD_PER_ELEMENT,
+   LP_SAMPLER_LOD_PER_QUAD
+};
+
+
 /**
  * Texture static state.
  *
@@ -476,7 +483,7 @@ lp_build_sample_soa(struct gallivm_state *gallivm,
                     const struct lp_derivatives *derivs,
                     LLVMValueRef lod_bias,
                     LLVMValueRef explicit_lod,
-                    boolean scalar_lod,
+                    enum lp_sampler_lod_property lod_property,
                     LLVMValueRef texel_out[4]);
 
 
@@ -497,7 +504,7 @@ lp_build_size_query_soa(struct gallivm_state *gallivm,
                         unsigned texture_unit,
                         unsigned target,
                         boolean is_sviewinfo,
-                        boolean scalar_lod,
+                        enum lp_sampler_lod_property lod_property,
                         LLVMValueRef explicit_lod,
                         LLVMValueRef *sizes_out);