From 1a33e0233ad5bfd0b7f62ae25811532c5784653f Mon Sep 17 00:00:00 2001
From: Paul Berry <stereotype441@gmail.com>
Date: Sun, 18 Aug 2013 20:59:37 -0700
Subject: glsl: During linking, record whether a GS uses EndPrimitive().

This information will be useful in the i965 back end, since we can
save some compilation effort if we know from the outset that the
shader never calls EndPrimitive().

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
---
 src/glsl/linker.cpp       | 31 +++++++++++++++++++++++++++++++
 src/mesa/main/mtypes.h    |  2 ++
 src/mesa/main/shaderapi.c |  1 +
 3 files changed, 34 insertions(+)

diff --git a/src/glsl/linker.cpp b/src/glsl/linker.cpp
index 65afc2e69b4..8a143fddfca 100644
--- a/src/glsl/linker.cpp
+++ b/src/glsl/linker.cpp
@@ -249,6 +249,33 @@ public:
 };
 
 
+/**
+ * Visitor that determines whether or not a shader uses ir_end_primitive.
+ */
+class find_end_primitive_visitor : public ir_hierarchical_visitor {
+public:
+   find_end_primitive_visitor()
+      : found(false)
+   {
+      /* empty */
+   }
+
+   virtual ir_visitor_status visit(ir_end_primitive *)
+   {
+      found = true;
+      return visit_stop;
+   }
+
+   bool end_primitive_found()
+   {
+      return found;
+   }
+
+private:
+   bool found;
+};
+
+
 void
 linker_error(gl_shader_program *prog, const char *fmt, ...)
 {
@@ -517,6 +544,10 @@ validate_geometry_shader_executable(struct gl_shader_program *prog,
 
    analyze_clip_usage("geometry", prog, shader, &prog->Geom.UsesClipDistance,
                       &prog->Geom.ClipDistanceArraySize);
+
+   find_end_primitive_visitor end_primitive;
+   end_primitive.run(shader->ir);
+   prog->Geom.UsesEndPrimitive = end_primitive.end_primitive_found();
 }
 
 
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index ca7111e509b..9df165403bd 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -1931,6 +1931,7 @@ struct gl_geometry_program
                            GL_TRIANGLES, or GL_TRIANGLES_ADJACENCY_ARB */
    GLenum OutputType; /**< GL_POINTS, GL_LINE_STRIP or GL_TRIANGLE_STRIP */
    GLboolean UsesClipDistance;
+   GLboolean UsesEndPrimitive;
 };
 
 
@@ -2364,6 +2365,7 @@ struct gl_shader_program
       GLboolean UsesClipDistance;
       GLuint ClipDistanceArraySize; /**< Size of the gl_ClipDistance array, or
                                          0 if not present. */
+      GLboolean UsesEndPrimitive;
    } Geom;
 
    /** Vertex shader state */
diff --git a/src/mesa/main/shaderapi.c b/src/mesa/main/shaderapi.c
index 4fe9d9ca252..a2386fb133e 100644
--- a/src/mesa/main/shaderapi.c
+++ b/src/mesa/main/shaderapi.c
@@ -1872,6 +1872,7 @@ _mesa_copy_linked_program_data(gl_shader_type type,
       dst_gp->InputType = src->Geom.InputType;
       dst_gp->OutputType = src->Geom.OutputType;
       dst_gp->UsesClipDistance = src->Geom.UsesClipDistance;
+      dst_gp->UsesEndPrimitive = src->Geom.UsesEndPrimitive;
    }
       break;
    default:
-- 
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