[Piglit] [PATCH 2/3] glx/glx-multithread-texture: Don't probe an undefined back buffer

[Thomas Hellstrom]

Backbuffer contents become undefined after a swapbuffer call, so instead
probe the front buffer. Alternatively we can of course probe the back
before the swapbuffer call.

Cc: Frank Henigman <fjhenigman at google.com>
Signed-off-by: Thomas Hellstrom <thellstrom at vmware.com>
---
 tests/glx/glx-multithread-texture.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tests/glx/glx-multithread-texture.c b/tests/glx/glx-multithread-texture.c
index c838fb7..08121e3 100644
--- a/tests/glx/glx-multithread-texture.c
+++ b/tests/glx/glx-multithread-texture.c
@@ -151,6 +151,7 @@ draw_func(void *arg)
 
 	glEnable(GL_TEXTURE_2D);
 	glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
+	glReadBuffer(GL_FRONT);
 
 	while (!quit && count < num_test) {
 		struct texture *tex = advance(&count, DRAW);
-- 
2.7.4