Mesa (master): glsl: Check that gl_ClipDistance[] is not sized too large.

[Paul Berry]

Module: Mesa
Branch: master
Commit: 37bb1c4de2eb2fa80d09b6e8dc8f39814d790e09
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=37bb1c4de2eb2fa80d09b6e8dc8f39814d790e09

Author: Paul Berry <stereotype441 at gmail.com>
Date:   Thu Aug 11 15:23:33 2011 -0700

glsl: Check that gl_ClipDistance[] is not sized too large.

Fixes piglit tests
clip-distance-explicit-too-large-with-access.{frag,vert} and
clip-distance-explicit-too-large.{frag,vert}.

Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>
Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>

---

 src/glsl/ast_to_hir.cpp |   15 +++++++++++++++
 1 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/src/glsl/ast_to_hir.cpp b/src/glsl/ast_to_hir.cpp
index fbb2c14..a4eaf85 100644
--- a/src/glsl/ast_to_hir.cpp
+++ b/src/glsl/ast_to_hir.cpp
@@ -912,6 +912,21 @@ check_builtin_array_max_size(const char *name, unsigned size,
                        "be larger than gl_MaxTextureCoords (%u)\n",
                        state->Const.MaxTextureCoords);
       return true;
+   } else if (strcmp("gl_ClipDistance", name) == 0
+              && size > state->Const.MaxClipPlanes) {
+      /* From section 7.1 (Vertex Shader Special Variables) of the
+       * GLSL 1.30 spec:
+       *
+       *   "The gl_ClipDistance array is predeclared as unsized and
+       *   must be sized by the shader either redeclaring it with a
+       *   size or indexing it only with integral constant
+       *   expressions. ... The size can be at most
+       *   gl_MaxClipDistances."
+       */
+      _mesa_glsl_error(&loc, state, "`gl_ClipDistance' array size cannot "
+                       "be larger than gl_MaxClipDistances (%u)\n",
+                       state->Const.MaxClipPlanes);
+      return true;
    }
    return false;
 }