[Mesa-dev] [PATCH 2/3] glsl/ast2hir: add a new flag attribute_input for VS input

[Gregory Hainaut]

GL_ARB_separate_shader_objects requires that all inputs varying remains active.

This flag allow to distinguish input attribute from the input varying.

Flag will be used on next commit.

Signed-off-by: Gregory Hainaut <gregory.hainaut at gmail.com>
---
 src/glsl/ast_to_hir.cpp | 4 ++++
 src/glsl/ir.h           | 9 +++++++++
 2 files changed, 13 insertions(+)

diff --git a/src/glsl/ast_to_hir.cpp b/src/glsl/ast_to_hir.cpp
index 72c6459..16bf849 100644
--- a/src/glsl/ast_to_hir.cpp
+++ b/src/glsl/ast_to_hir.cpp
@@ -2590,6 +2590,10 @@ apply_type_qualifier_to_variable(const struct ast_type_qualifier *qual,
                        _mesa_shader_stage_to_string(state->stage));
    }
 
+   if (state->stage == MESA_SHADER_VERTEX &&
+         (qual->flags.q.attribute || qual->flags.q.in))
+      var->data.attribute_input = 1;
+
    /* Disallow layout qualifiers which may only appear on layout declarations. */
    if (qual->flags.q.prim_type) {
       _mesa_glsl_error(loc, state,
diff --git a/src/glsl/ir.h b/src/glsl/ir.h
index f9ddf74..a1f5fa0 100644
--- a/src/glsl/ir.h
+++ b/src/glsl/ir.h
@@ -627,6 +627,15 @@ public:
       unsigned precise:1;
 
       /**
+       * Is the variable an input from the Vertex Shader?
+       *
+       * GL_ARB_separate_shader_objects doesn't allow the optimization of
+       * unused varying variable. However unused-attribute must still be
+       * optimized.
+       */
+      unsigned attribute_input:1;
+
+      /**
        * Has this variable been used for reading or writing?
        *
        * Several GLSL semantic checks require knowledge of whether or not a
-- 
2.1.4