Mesa (master): glsl/cs: Prohibit mixing of compute and non-compute shaders.

[Paul Berry]

Module: Mesa
Branch: master
Commit: 1fe274b3d7a8e70dc605e6076d29e00add292508
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=1fe274b3d7a8e70dc605e6076d29e00add292508

Author: Paul Berry <stereotype441 at gmail.com>
Date:   Wed Jan  8 11:40:23 2014 -0800

glsl/cs: Prohibit mixing of compute and non-compute shaders.

Fixes piglit test:
spec/ARB_compute_shader/linker/mix_compute_and_non_compute

Reviewed-by: Jordan Justen <jordan.l.justen at intel.com>

---

 src/glsl/linker.cpp |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/glsl/linker.cpp b/src/glsl/linker.cpp
index 6a07e4a..bcd7394 100644
--- a/src/glsl/linker.cpp
+++ b/src/glsl/linker.cpp
@@ -2109,6 +2109,13 @@ link_shaders(struct gl_context *ctx, struct gl_shader_program *prog)
       goto done;
    }
 
+   /* Compute shaders have additional restrictions. */
+   if (num_shaders[MESA_SHADER_COMPUTE] > 0 &&
+       num_shaders[MESA_SHADER_COMPUTE] != prog->NumShaders) {
+      linker_error(prog, "Compute shaders may not be linked with any other "
+                   "type of shader\n");
+   }
+
    for (unsigned int i = 0; i < MESA_SHADER_STAGES; i++) {
       if (prog->_LinkedShaders[i] != NULL)
 	 ctx->Driver.DeleteShader(ctx, prog->_LinkedShaders[i]);