For unknown reasons, using BGRA8 images on Fermi results in breaking reads from PBOs, such that they always return 0x0. Discovered this through a glamor bug, and confirmed it does indeed break a good number of piglit tests such as spec/arb_pixel_buffer_object/pbo-read-argb8888
Until we have a proper fix, just disable this functionality on Fermi. Signed-off-by: Lyude <ly...@redhat.com> --- src/gallium/drivers/nouveau/nvc0/nvc0_screen.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c b/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c index c636926..f6c5c72 100644 --- a/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c +++ b/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c @@ -87,11 +87,20 @@ nvc0_screen_is_format_supported(struct pipe_screen *pscreen, bindings &= ~(PIPE_BIND_LINEAR | PIPE_BIND_SHARED); - if (bindings & PIPE_BIND_SHADER_IMAGE && sample_count > 1 && - nouveau_screen(pscreen)->class_3d >= GM107_3D_CLASS) { - /* MS images are currently unsupported on Maxwell because they have to - * be handled explicitly. */ - return false; + if (bindings & PIPE_BIND_SHADER_IMAGE) { + if (sample_count > 1 && + nouveau_screen(pscreen)->class_3d >= GM107_3D_CLASS) { + /* MS images are currently unsupported on Maxwell because they have to + * be handled explicitly. */ + return false; + } + + if (format == PIPE_FORMAT_B8G8R8A8_UNORM && + nouveau_screen(pscreen)->class_3d < NVE4_3D_CLASS) { + /* This should work on Fermi, but for currently unknown reasons it + * does not and results in breaking reads from pbos. */ + return false; + } } return (( nvc0_format_table[format].usage | -- 2.9.4 _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev