glsl: flag shaders which use gather4 at all

Signed-off-by: Chris Forbes <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>

2 files changed, 11 insertions, 0 deletions

diff --git a/src/glsl/ir_set_program_inouts.cpp b/src/glsl/ir_set_program_inouts.cpp
index 1267d6d7177..ab23538c341 100644
--- a/src/glsl/ir_set_program_inouts.cpp
+++ b/src/glsl/ir_set_program_inouts.cpp
@@ -59,6 +59,7 @@ public:
    virtual ir_visitor_status visit_enter(ir_function_signature *);
    virtual ir_visitor_status visit_enter(ir_expression *);
    virtual ir_visitor_status visit_enter(ir_discard *);
+   virtual ir_visitor_status visit_enter(ir_texture *);
    virtual ir_visitor_status visit(ir_dereference_variable *);
 
 private:
@@ -319,6 +320,14 @@ ir_set_program_inouts_visitor::visit_enter(ir_discard *)
    return visit_continue;
 }
 
+ir_visitor_status
+ir_set_program_inouts_visitor::visit_enter(ir_texture *ir)
+{
+   if (ir->op == ir_tg4)
+      prog->UsesGather = true;
+   return visit_continue;
+}
+
 void
 do_set_program_inouts(exec_list *instructions, struct gl_program *prog,
                       GLenum shader_type)
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 3d414d5e76e..514f81048d1 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -1963,6 +1963,8 @@ struct gl_program
    GLbitfield SamplersUsed;   /**< Bitfield of which samplers are used */
    GLbitfield ShadowSamplers; /**< Texture units used for shadow sampling. */
 
+   GLboolean UsesGather; /**< Does this program use gather4 at all? */
+
 
    /** Named parameters, constants, etc. from program text */
    struct gl_program_parameter_list *Parameters;