From: Ian Romanick <[email protected]>
Signed-off-by: Ian Romanick <[email protected]>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=59833
---
tests/glx/glx-swap-pixmap.c | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)
diff --git a/tests/glx/glx-swap-pixmap.c b/tests/glx/glx-swap-pixmap.c
index 1a91578..855396a 100644
--- a/tests/glx/glx-swap-pixmap.c
+++ b/tests/glx/glx-swap-pixmap.c
@@ -44,9 +44,11 @@ main(int argc, char **argv)
{
Pixmap p;
GLXPixmap g;
- float green[4] = {0.0, 1.0, 0.0, 0.0};
+ static const float green_alpha_zero[4] = {0.0, 1.0, 0.0, 0.0};
+ static const float green_alpha_one[4] = {0.0, 1.0, 0.0, 1.0};
GLXContext ctx;
bool pass;
+ GLint alpha_bits;
dpy = XOpenDisplay(NULL);
if (dpy == NULL) {
@@ -80,7 +82,17 @@ main(int argc, char **argv)
*/
XSync(dpy, False);
- pass = piglit_probe_rect_rgba(0, 0, piglit_width, piglit_height, green);
+ /* If the visual has no alpha, then the GL spec requires that 1.0 be
+ * read back. Otherwise, we should read back the 0.0 that we wrote.
+ */
+ glGetIntegerv(GL_ALPHA_BITS, &alpha_bits);
+ if (alpha_bits == 0) {
+ pass = piglit_probe_rect_rgba(0, 0, piglit_width, piglit_height,
+ green_alpha_one);
+ } else {
+ pass = piglit_probe_rect_rgba(0, 0, piglit_width, piglit_height,
+ green_alpha_zero);
+ }
glXDestroyPixmap(dpy, g);
--
1.7.11.7
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