diff options
| -rw-r--r-- | tests/glx/glx-swap-pixmap.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/tests/glx/glx-swap-pixmap.c b/tests/glx/glx-swap-pixmap.c index 1a91578a..855396a0 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); |