gallium: plumb invariant output attrib thru TGSI

Add support for glsl 'invariant' modifier for output data declarations.
Gallium drivers that use TGSI serialization currently loose invariant
modifiers in glsl shaders.

v2: use boolean for invariant instead of unsigned.

Tested: chromiumos on qemu with virglrenderer.
Reviewed-by: Marek Olšák <[email protected]>
Signed-off-by: Dave Airlie <[email protected]>

1 files changed, 6 insertions, 2 deletions

diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index 673c0f6b67a..00799b4a872 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -123,6 +123,7 @@ struct inout_decl {
    enum glsl_interp_mode interp;
    enum glsl_base_type base_type;
    ubyte usage_mask; /* GLSL-style usage-mask,  i.e. single bit per double */
+   bool invariant;
 };
 
 static struct inout_decl *
@@ -2508,6 +2509,8 @@ glsl_to_tgsi_visitor::visit(ir_dereference_variable *ir)
          unsigned num_components;
          num_outputs++;
 
+         decl->invariant = var->data.invariant;
+
          if (type_without_array->is_64bit())
             component = component / 2;
          if (type_without_array->vector_elements)
@@ -6443,14 +6446,15 @@ st_translate_program(
                      (enum tgsi_semantic) outputSemanticName[slot],
                      outputSemanticIndex[slot],
                      decl->gs_out_streams,
-                     slot, tgsi_usage_mask, decl->array_id, decl->size);
-
+                     slot, tgsi_usage_mask, decl->array_id, decl->size, decl->invariant);
+         dst.Invariant = decl->invariant;
          for (unsigned j = 0; j < decl->size; ++j) {
             if (t->outputs[slot + j].File != TGSI_FILE_OUTPUT) {
                /* The ArrayID is set up in dst_register */
                t->outputs[slot + j] = dst;
                t->outputs[slot + j].ArrayID = 0;
                t->outputs[slot + j].Index += j;
+               t->outputs[slot + j].Invariant = decl->invariant;
             }
          }
       }