From df16e0dd63dfeb7d5086339113ff7d7197010847 Mon Sep 17 00:00:00 2001
From: Chris Forbes <chrisf@ijw.co.nz>
Date: Tue, 9 Sep 2014 19:25:02 +1200
Subject: [PATCH] glsl: analyze TES usage of gl_ClipDistance

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
---
 src/glsl/linker.cpp       | 19 +++++++++++++++++++
 src/mesa/main/mtypes.h    |  7 +++++++
 src/mesa/main/shaderapi.c |  1 +
 3 files changed, 27 insertions(+)

diff --git a/src/glsl/linker.cpp b/src/glsl/linker.cpp
index c74ec56..eeab3a3 100644
--- a/src/glsl/linker.cpp
+++ b/src/glsl/linker.cpp
@@ -666,6 +666,17 @@ validate_vertex_shader_executable(struct gl_shader_program *prog,
                       &prog->Vert.ClipDistanceArraySize);
 }
 
+void
+validate_tess_eval_shader_executable(struct gl_shader_program *prog,
+                                     struct gl_shader *shader)
+{
+   if (shader == NULL)
+      return;
+
+   analyze_clip_usage(prog, shader, &prog->TessEval.UsesClipDistance,
+                      &prog->TessEval.ClipDistanceArraySize);
+}
+
 
 /**
  * Verify that a fragment shader executable meets all semantic requirements
@@ -3215,6 +3226,12 @@ link_shaders(struct gl_context *ctx, struct gl_shader_program *prog)
          case MESA_SHADER_VERTEX:
             validate_vertex_shader_executable(prog, sh);
             break;
+         case MESA_SHADER_TESS_CTRL:
+            /* nothing to be done */
+            break;
+         case MESA_SHADER_TESS_EVAL:
+            validate_tess_eval_shader_executable(prog, sh);
+            break;
          case MESA_SHADER_GEOMETRY:
             validate_geometry_shader_executable(prog, sh);
             break;
@@ -3234,6 +3251,8 @@ link_shaders(struct gl_context *ctx, struct gl_shader_program *prog)
 
    if (num_shaders[MESA_SHADER_GEOMETRY] > 0)
       prog->LastClipDistanceArraySize = prog->Geom.ClipDistanceArraySize;
+   else if (num_shaders[MESA_SHADER_TESS_EVAL] > 0)
+      prog->LastClipDistanceArraySize = prog->TessEval.ClipDistanceArraySize;
    else if (num_shaders[MESA_SHADER_VERTEX] > 0)
       prog->LastClipDistanceArraySize = prog->Vert.ClipDistanceArraySize;
    else
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index f97468d..85e04b5 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -2781,6 +2781,13 @@ struct gl_shader_program
       /** GL_CW or GL_CCW */
       GLenum VertexOrder;
       bool PointMode;
+      /**
+       * True if gl_ClipDistance is written to.  Copied into
+       * gl_tess_eval_program by _mesa_copy_linked_program_data().
+       */
+      GLboolean UsesClipDistance;
+      GLuint ClipDistanceArraySize; /**< Size of the gl_ClipDistance array, or
+                                         0 if not present. */
    } TessEval;
 
    /**
diff --git a/src/mesa/main/shaderapi.c b/src/mesa/main/shaderapi.c
index 40b4d41..3836590 100644
--- a/src/mesa/main/shaderapi.c
+++ b/src/mesa/main/shaderapi.c
@@ -2057,6 +2057,7 @@ _mesa_copy_linked_program_data(gl_shader_stage type,
       dst_tep->Spacing = src->TessEval.Spacing;
       dst_tep->VertexOrder = src->TessEval.VertexOrder;
       dst_tep->PointMode = src->TessEval.PointMode;
+      dst->UsesClipDistanceOut = src->TessEval.UsesClipDistance;
       break;
    }
    case MESA_SHADER_GEOMETRY: {
-- 
2.7.4