glsl: Add ir_variable::is_in_uniform_block predicate

The way a variable is tested for this property is about to change, and
this makes the code easier to modify.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Carl Worth <cworth@cworth.org>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/glsl/ir.h

@@ -349,6 +349,14 @@ public:
     */
    glsl_interp_qualifier determine_interpolation_mode(bool flat_shade);
 
+   /**
+    * Determine whether or not a variable is part of a uniform block.
+    */
+   inline bool is_in_uniform_block() const
+   {
+      return this->mode == ir_var_uniform && this->uniform_block != -1;
+   }
+
    /**
     * Declared type of the variable
     */

src/glsl/link_uniforms.cpp

@@ -228,7 +228,7 @@ public:
 			ir_variable *var)
    {
       ubo_var = NULL;
-      if (var->uniform_block != -1) {
+      if (var->is_in_uniform_block()) {
 	 struct gl_uniform_block *block =
 	    &shader->UniformBlocks[var->uniform_block];
 
@@ -442,7 +442,7 @@ link_update_uniform_buffer_variables(struct gl_shader *shader)
    foreach_list(node, shader->ir) {
       ir_variable *const var = ((ir_instruction *) node)->as_variable();
 
-      if ((var == NULL) || (var->uniform_block == -1))
+      if ((var == NULL) || !var->is_in_uniform_block())
 	 continue;
 
       assert(var->mode == ir_var_uniform);

src/glsl/linker.cpp

@@ -1077,7 +1077,7 @@ update_array_sizes(struct gl_shader_program *prog)
 	  * will not be eliminated.  Since we always do std140, just
 	  * don't resize arrays in UBOs.
 	  */
-	 if (var->uniform_block != -1)
+	 if (var->is_in_uniform_block())
 	    continue;
 
 	 unsigned int size = var->max_array_access;

src/glsl/lower_ubo_reference.cpp

@@ -78,7 +78,7 @@ lower_ubo_reference_visitor::handle_rvalue(ir_rvalue **rvalue)
       return;
 
    ir_variable *var = deref->variable_referenced();
-   if (!var || var->uniform_block == -1)
+   if (!var || !var->is_in_uniform_block())
       return;
 
    mem_ctx = ralloc_parent(*rvalue);

src/glsl/opt_dead_code.cpp

@@ -106,7 +106,7 @@ do_dead_code(exec_list *instructions, bool uniform_locations_assigned)
 	 if (entry->var->mode == ir_var_uniform &&
 	     (uniform_locations_assigned ||
 	      entry->var->constant_value ||
-	      entry->var->uniform_block != -1))
+	      entry->var->is_in_uniform_block()))
 	    continue;
 
 	 entry->var->remove();

src/mesa/drivers/dri/i965/brw_fs_visitor.cpp

@@ -107,7 +107,7 @@ fs_visitor::visit(ir_variable *ir)
        * ir_binop_ubo_load expressions and not ir_dereference_variable for UBO
        * variables, so no need for them to be in variable_ht.
        */
-      if (ir->uniform_block != -1)
+      if (ir->is_in_uniform_block())
          return;
 
       if (dispatch_width == 16) {

src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp

@@ -1052,7 +1052,7 @@ vec4_visitor::visit(ir_variable *ir)
        * ir_binop_ubo_load expressions and not ir_dereference_variable for UBO
        * variables, so no need for them to be in variable_ht.
        */
-      if (ir->uniform_block != -1)
+      if (ir->is_in_uniform_block())
          return;
 
       /* Track how big the whole uniform variable is, in case we need to put a

src/mesa/program/ir_to_mesa.cpp

@@ -2470,7 +2470,7 @@ _mesa_generate_parameters_list_for_uniforms(struct gl_shader_program
       ir_variable *var = ((ir_instruction *) node)->as_variable();
 
       if ((var == NULL) || (var->mode != ir_var_uniform)
-	  || var->uniform_block != -1 || (strncmp(var->name, "gl_", 3) == 0))
+	  || var->is_in_uniform_block() || (strncmp(var->name, "gl_", 3) == 0))
 	 continue;
 
       add.process(var);