Mesa (master): mesa: fix error handling in _mesa_TransformFeedbackVaryings

[Tapani Pälli]

Module: Mesa
Branch: master
Commit: fc8b358bd6971cc858bb06bdb4eed92656a6d8bd
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=fc8b358bd6971cc858bb06bdb4eed92656a6d8bd

Author: Tapani Pälli <tapani.palli at intel.com>
Date:   Mon Oct 10 09:49:36 2016 +0300

mesa: fix error handling in _mesa_TransformFeedbackVaryings

Patch changes function to use _mesa_lookup_shader_program_err both
in TransformFeedbackVaryings and GetTransformFeedbackVarying that
handles errors correctly for invalid values of shader program.

Fixes following dEQP test:
   dEQP-GLES31.functional.debug.negative_coverage.get_error.shader.transform_feedback_varyings

Signed-off-by: Tapani Pälli <tapani.palli at intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=98135
Reviewed-by: Iago Toral Quiroga <itoral at igalia.com>

---

 src/mesa/main/transformfeedback.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/src/mesa/main/transformfeedback.c b/src/mesa/main/transformfeedback.c
index 7c0ff6f..738d63e 100644
--- a/src/mesa/main/transformfeedback.c
+++ b/src/mesa/main/transformfeedback.c
@@ -846,12 +846,10 @@ _mesa_TransformFeedbackVaryings(GLuint program, GLsizei count,
       return;
    }
 
-   shProg = _mesa_lookup_shader_program(ctx, program);
-   if (!shProg) {
-      _mesa_error(ctx, GL_INVALID_VALUE,
-                  "glTransformFeedbackVaryings(program=%u)", program);
+   shProg = _mesa_lookup_shader_program_err(ctx, program,
+                                            "glTransformFeedbackVaryings");
+   if (!shProg)
       return;
-   }
 
    if (ctx->Extensions.ARB_transform_feedback3) {
       if (bufferMode == GL_INTERLEAVED_ATTRIBS) {
@@ -927,12 +925,10 @@ _mesa_GetTransformFeedbackVarying(GLuint program, GLuint index,
    struct gl_program_resource *res;
    GET_CURRENT_CONTEXT(ctx);
 
-   shProg = _mesa_lookup_shader_program(ctx, program);
-   if (!shProg) {
-      _mesa_error(ctx, GL_INVALID_VALUE,
-                  "glGetTransformFeedbackVarying(program=%u)", program);
+   shProg = _mesa_lookup_shader_program_err(ctx, program,
+                                            "glGetTransformFeedbackVarying");
+   if (!shProg)
       return;
-   }
 
    res = _mesa_program_resource_find_index((struct gl_shader_program *) shProg,
                                            GL_TRANSFORM_FEEDBACK_VARYING,