1 files changed, 110 insertions, 0 deletions
diff --git a/mesalib/src/glsl/link_interface_blocks.cpp b/mesalib/src/glsl/link_interface_blocks.cpp
new file mode 100644
index 000000000..b91860d03
--- /dev/null
+++ b/mesalib/src/glsl/link_interface_blocks.cpp
@@ -0,0 +1,110 @@
+/*
+ * Copyright © 2013 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+/**
+ * \file link_interface_blocks.cpp
+ * Linker support for GLSL's interface blocks.
+ */
+
+#include "ir.h"
+#include "glsl_symbol_table.h"
+#include "linker.h"
+#include "main/macros.h"
+
+bool
+validate_intrastage_interface_blocks(const gl_shader **shader_list,
+                                     unsigned num_shaders)
+{
+   glsl_symbol_table interfaces;
+
+   for (unsigned int i = 0; i < num_shaders; i++) {
+      if (shader_list[i] == NULL)
+         continue;
+
+      foreach_list(node, shader_list[i]->ir) {
+         ir_variable *var = ((ir_instruction *) node)->as_variable();
+         if (!var)
+            continue;
+
+         const glsl_type *iface_type = var->interface_type;
+
+         if (iface_type == NULL)
+            continue;
+
+         const glsl_type *old_iface_type =
+            interfaces.get_interface(iface_type->name,
+                                     (enum ir_variable_mode) var->mode);
+
+         if (old_iface_type == NULL) {
+            /* This is the first time we've seen the interface, so save
+             * it into our symbol table.
+             */
+            interfaces.add_interface(iface_type->name, iface_type,
+                                     (enum ir_variable_mode) var->mode);
+         } else if (old_iface_type != iface_type) {
+            return false;
+         }
+      }
+   }
+
+   return true;
+}
+
+bool
+validate_interstage_interface_blocks(const gl_shader *producer,
+                                     const gl_shader *consumer)
+{
+   glsl_symbol_table interfaces;
+
+   /* Add non-output interfaces from the consumer to the symbol table. */
+   foreach_list(node, consumer->ir) {
+      ir_variable *var = ((ir_instruction *) node)->as_variable();
+      if (!var || !var->interface_type || var->mode == ir_var_shader_out)
+         continue;
+
+      interfaces.add_interface(var->interface_type->name,
+                               var->interface_type,
+                               (enum ir_variable_mode) var->mode);
+   }
+
+   /* Verify that the producer's interfaces match. */
+   foreach_list(node, producer->ir) {
+      ir_variable *var = ((ir_instruction *) node)->as_variable();
+      if (!var || !var->interface_type || var->mode == ir_var_shader_in)
+         continue;
+
+      enum ir_variable_mode consumer_mode =
+         var->mode == ir_var_uniform ? ir_var_uniform : ir_var_shader_in;
+      const glsl_type *expected_type =
+         interfaces.get_interface(var->interface_type->name, consumer_mode);
+
+      /* The consumer doesn't use this output block.  Ignore it. */
+      if (expected_type == NULL)
+         continue;
+
+      if (var->interface_type != expected_type)
+         return false;
+   }
+
+   return true;
+}