glsl: Identify active uniform blocks that are buffer blocks as such.

Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

src/glsl/link_uniform_block_active_visitor.cpp

@@ -44,6 +44,7 @@ process_block(void *mem_ctx, struct hash_table *ht, ir_variable *var)
 
       b->type = block_type;
       b->has_instance_name = var->is_interface_instance();
+      b->is_shader_storage = var->data.mode == ir_var_shader_storage;
 
       if (var->data.explicit_binding) {
          b->has_binding = true;

src/glsl/link_uniform_block_active_visitor.h

@@ -38,6 +38,7 @@ struct link_uniform_block_active {
 
    bool has_instance_name;
    bool has_binding;
+   bool is_shader_storage;
 };
 
 class link_uniform_block_active_visitor : public ir_hierarchical_visitor {

src/glsl/link_uniform_blocks.cpp

@@ -293,6 +293,8 @@ link_uniform_blocks(void *mem_ctx,
             blocks[i].NumUniforms =
                (unsigned)(ptrdiff_t)(&variables[parcel.index] - blocks[i].Uniforms);
 
+            blocks[i].IsShaderStorage = b->is_shader_storage;
+
             i++;
          }
       } else {
@@ -311,6 +313,8 @@ link_uniform_blocks(void *mem_ctx,
          blocks[i].NumUniforms =
             (unsigned)(ptrdiff_t)(&variables[parcel.index] - blocks[i].Uniforms);
 
+         blocks[i].IsShaderStorage = b->is_shader_storage;
+
          i++;
       }
    }

src/mesa/main/mtypes.h

@@ -2564,6 +2564,11 @@ struct gl_uniform_block
     */
    GLuint UniformBufferSize;
 
+   /**
+    * Is this actually an interface block for a shader storage buffer?
+    */
+   bool IsShaderStorage;
+
    /**
     * Layout specified in the shader
     *