mesa/glsl: new compiler option EmitNoIndirectSampler

Patch provides new compiler option for backend to force unroll loops
that have non-constant expression indexing on sampler arrays.

This makes sure that we can never end up with a shader that uses loop
induction variable as sampler array index but does not unroll because
of having too much instructions. This would not work without dynamic
indexing support.

v2: change option name as EmitNoIndirectSampler

Signed-off-by: Tapani Pälli <[email protected]>
Reviewed-by: Francisco Jerez <[email protected]>
Cc: "10.5" and "10.6" <[email protected]>

1 files changed, 12 insertions, 0 deletions

diff --git a/src/glsl/loop_unroll.cpp b/src/glsl/loop_unroll.cpp
index 635e1dd99cd..7a00fb8fea8 100644
--- a/src/glsl/loop_unroll.cpp
+++ b/src/glsl/loop_unroll.cpp
@@ -100,6 +100,18 @@ public:
 
    virtual ir_visitor_status visit_enter(ir_dereference_array *ir)
    {
+      /* Force unroll in case of dynamic indexing with sampler arrays
+       * when EmitNoIndirectSampler is set.
+       */
+      if (options->EmitNoIndirectSampler) {
+         if ((ir->array->type->is_array() &&
+              ir->array->type->contains_sampler()) &&
+             !ir->array_index->constant_expression_value()) {
+            unsupported_variable_indexing = true;
+            return visit_continue;
+         }
+      }
+
       /* Check for arrays variably-indexed by a loop induction variable.
        * Unrolling the loop may convert that access into constant-indexing.
        *