[Mesa-dev] [PATCH] glsl: Disallow transform feedback varyings with compute shaders.

[Kenneth Graunke]

If the only stage is MESA_SHADER_COMPUTE, we should complain that
there's nothing coming out of the geometry shader stage just as
we would if the first stage were MESA_SHADER_FRAGMENT.

Also, it's valid for tessellation shaders to be the stage producing
transform feedback varyings, so mention those in the compiler error.

Found by inspection.

Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
Cc: Timothy Arceri <timothy.arceri at collabora.com>
---
 src/compiler/glsl/linker.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/compiler/glsl/linker.cpp b/src/compiler/glsl/linker.cpp
index f1ac53a..3f871ab 100644
--- a/src/compiler/glsl/linker.cpp
+++ b/src/compiler/glsl/linker.cpp
@@ -4452,9 +4452,10 @@ link_shaders(struct gl_context *ctx, struct gl_shader_program *prog)
        *     non-zero, but the program object has no vertex or geometry
        *     shader;
        */
-      if (first == MESA_SHADER_FRAGMENT) {
+      if (first >= MESA_SHADER_FRAGMENT) {
          linker_error(prog, "Transform feedback varyings specified, but "
-                      "no vertex or geometry shader is present.\n");
+                      "no vertex, tessellation, or geometry shader is "
+                      "present.\n");
          goto done;
       }
 
-- 
2.7.0