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-rw-r--r--mesalib/src/glsl/linker.cpp19
1 files changed, 19 insertions, 0 deletions
diff --git a/mesalib/src/glsl/linker.cpp b/mesalib/src/glsl/linker.cpp
index 3538dc5fe..ad50fe18d 100644
--- a/mesalib/src/glsl/linker.cpp
+++ b/mesalib/src/glsl/linker.cpp
@@ -262,6 +262,25 @@ validate_vertex_shader_executable(struct gl_shader_program *prog,
return false;
}
+ if (prog->Version >= 130) {
+ /* From section 7.1 (Vertex Shader Special Variables) of the
+ * GLSL 1.30 spec:
+ *
+ * "It is an error for a shader to statically write both
+ * gl_ClipVertex and gl_ClipDistance."
+ */
+ find_assignment_visitor clip_vertex("gl_ClipVertex");
+ find_assignment_visitor clip_distance("gl_ClipDistance");
+
+ clip_vertex.run(shader->ir);
+ clip_distance.run(shader->ir);
+ if (clip_vertex.variable_found() && clip_distance.variable_found()) {
+ linker_error(prog, "vertex shader writes to both `gl_ClipVertex' "
+ "and `gl_ClipDistance'\n");
+ return false;
+ }
+ }
+
return true;
}