From a1b83464ffb1125b77e6f5664e0071f95167055d Mon Sep 17 00:00:00 2001
From: Chad Versace <chad.versace@intel.com>
Date: Thu, 27 Jan 2011 01:40:35 -0800
Subject: [PATCH] mesa: Propagate gl_FragDepth layout from GLSL IR to Mesa IR

---
 src/mesa/main/mtypes.h          | 18 ++++++++++++++++++
 src/mesa/program/ir_to_mesa.cpp | 23 +++++++++++++++++++++++
 2 files changed, 41 insertions(+)

diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 08b981883fb..37f39ceef35 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -867,6 +867,23 @@ struct gl_fog_attrib
 };
 
 
+/**
+ * \brief Layout qualifiers for gl_FragDepth.
+ *
+ * Extension AMD_conservative_depth allows gl_FragDepth to be redeclared with
+ * a layout qualifier.
+ *
+ * \see enum ir_depth_layout
+ */
+enum gl_frag_depth_layout {
+    FRAG_DEPTH_LAYOUT_NONE, /**< No layout is specified. */
+    FRAG_DEPTH_LAYOUT_ANY,
+    FRAG_DEPTH_LAYOUT_GREATER,
+    FRAG_DEPTH_LAYOUT_LESS,
+    FRAG_DEPTH_LAYOUT_UNCHANGED
+};
+
+
 /** 
  * Hint attribute group (GL_HINT_BIT).
  * 
@@ -1889,6 +1906,7 @@ struct gl_fragment_program
    GLboolean UsesKill;          /**< shader uses KIL instruction */
    GLboolean OriginUpperLeft;
    GLboolean PixelCenterInteger;
+   enum gl_frag_depth_layout FragDepthLayout;
 };
 
 
diff --git a/src/mesa/program/ir_to_mesa.cpp b/src/mesa/program/ir_to_mesa.cpp
index ee3eae6cfb0..e4a9a0f028a 100644
--- a/src/mesa/program/ir_to_mesa.cpp
+++ b/src/mesa/program/ir_to_mesa.cpp
@@ -727,6 +727,29 @@ ir_to_mesa_visitor::visit(ir_variable *ir)
 
       fp->OriginUpperLeft = ir->origin_upper_left;
       fp->PixelCenterInteger = ir->pixel_center_integer;
+
+   } else if (strcmp(ir->name, "gl_FragDepth") == 0) {
+      struct gl_fragment_program *fp = (struct gl_fragment_program *)this->prog;
+      switch (ir->depth_layout) {
+      case ir_depth_layout_none:
+	 fp->FragDepthLayout = FRAG_DEPTH_LAYOUT_NONE;
+	 break;
+      case ir_depth_layout_any:
+	 fp->FragDepthLayout = FRAG_DEPTH_LAYOUT_ANY;
+	 break;
+      case ir_depth_layout_greater:
+	 fp->FragDepthLayout = FRAG_DEPTH_LAYOUT_GREATER;
+	 break;
+      case ir_depth_layout_less:
+	 fp->FragDepthLayout = FRAG_DEPTH_LAYOUT_LESS;
+	 break;
+      case ir_depth_layout_unchanged:
+	 fp->FragDepthLayout = FRAG_DEPTH_LAYOUT_UNCHANGED;
+	 break;
+      default:
+	 assert(0);
+	 break;
+      }
    }
 
    if (ir->mode == ir_var_uniform && strncmp(ir->name, "gl_", 3) == 0) {
-- 
2.30.2