mesa: don't use genned but unnamed xfb objects.

If we try to draw or query an XFB object that hasn't been bound,
we shouldn't return any information.

This fixes a couple if cases in:
GL33-CTS.transform_feedback.api_errors_test

The ObjectLabel test is inspired by another test.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/src/mesa/main/api_validate.c b/src/mesa/main/api_validate.c
index 9d29f8d..a714c0a 100644
--- a/src/mesa/main/api_validate.c
+++ b/src/mesa/main/api_validate.c
@@ -665,6 +665,15 @@ _mesa_validate_DrawTransformFeedback(struct gl_context *ctx,
       return GL_FALSE;
    }
 
+   /* From the GL 4.5 specification, page 429:
+    * "An INVALID_VALUE error is generated if id is not the name of a
+    *  transform feedback object."
+    */
+   if (!obj->EverBound) {
+      _mesa_error(ctx, GL_INVALID_VALUE, "glDrawTransformFeedback*(name)");
+      return GL_FALSE;
+   }
+
    if (stream >= ctx->Const.MaxVertexStreams) {
       _mesa_error(ctx, GL_INVALID_VALUE,
                   "glDrawTransformFeedbackStream*(index>=MaxVertexStream)");