[Piglit] [PATCH v4 1/4] primitive-restart: probe pixel 0, 0 to make sure it was not drawn

[Jordan Justen]

Since failures of primitive restart sometimes lead a vertex to
appear at 0, 0, we test this pixel to make sure it was not drawn.

Signed-off-by: Jordan Justen <jordan.l.justen at intel.com>
---
 tests/general/primitive-restart.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tests/general/primitive-restart.c b/tests/general/primitive-restart.c
index 3642ffa..a7bb176 100644
--- a/tests/general/primitive-restart.c
+++ b/tests/general/primitive-restart.c
@@ -54,6 +54,10 @@ check_rendering(void)
    GLboolean draw = GL_TRUE;
    GLfloat x;
 
+   if (!piglit_probe_pixel_rgb(0, 0, black)) {
+      return GL_FALSE;
+   }
+
    for (x = x0 + 0.5 * dx; x < x1; x += dx) {
       GLboolean pass;
       const int ix = (int) x;
-- 
1.7.9.5