Hi,
I'm currently trying to figure out why glean/texCube reproducably fails on my
R420. That test basically has a number of sections that look like this
loop(..) {
render();
loop(..) {
glReadPixels(..);
check_values();
}
}
The outer loop continuously overwrites the
Each of the following changes individually fixes the problem:
1) Do not overwrite the same region of the framebuffer in every iteration;
instead, use a different framebuffer region for every iteration.
2) Add a sleep(1) before glReadPixels.
3) Add a sleep(1) after glReadPixels.
4)
On 07.06.2008 23:42, Dave Airlie wrote:
Each of the following changes individually fixes the problem:
1) Do not overwrite the same region of the framebuffer in every iteration;
instead, use a different framebuffer region for every iteration.
2) Add a sleep(1) before glReadPixels.
3) Add a
Hmm, the radeon_cp_idle() should purge the destination cache (and wait
for it too, including checking the DC_BUSY bit).
At least the r200 driver has a comment in r200SpanRenderStart (including
a dodgy workaround) which sure looks like the same issue to me.
We may purge the cache but not
