path: root/src/gallium/drivers
diff options
authorTomasz Figa <>2018-12-14 17:17:40 +0900
committerRoland Scheidegger <>2019-01-09 02:06:13 +0100
commitf6a6da8131383d8eeee07cd59326a70f4b15866b (patch)
tree2fadb24f203ae0ed474db79b84d1b63c906ced10 /src/gallium/drivers
parent700aeaf9c863ea545fe529c1a7fcbc8e87c9adb4 (diff)
llvmpipe: Always return some fence in flush (v2)
If there is no last fence, due to no rendering happening yet, just create a new signaled fence and return it, to match the expectations of the EGL sync fence API. Fixes random "Could not create sync fence 0x3003" assertion failures from Skia on Android, coming from the following code: Reproducible especially with thread count >= 4. One could make the driver always keep the reference to the last fence, but: - the driver seems to explicitly destroy the fence whenever a rendering pass completes and changing that would require a significant functional change to the code. (Specifically, in lp_scene_end_rasterization().) - it still wouldn't solve the problem of an EGL sync fence being created and waited on without any rendering happening at all, which is also likely to happen with Android code pointed to in the commit. Therefore, the simple approach of always creating a fence is taken, similarly to other drivers, such as radeonsi. Tested with piglit llvmpipe suite with no regressions and following tests fixed: egl_khr_fence_sync conformance eglclientwaitsynckhr_flag_sync_flush eglclientwaitsynckhr_nonzero_timeout eglclientwaitsynckhr_zero_timeout eglcreatesynckhr_default_attributes eglgetsyncattribkhr_invalid_attrib eglgetsyncattribkhr_sync_status v2: - remove the useless lp_fence_reference() dance (Nicolai), - explain why creating the dummy fence is the right approach. Signed-off-by: Tomasz Figa <>
Diffstat (limited to 'src/gallium/drivers')
1 files changed, 2 insertions, 0 deletions
diff --git a/src/gallium/drivers/llvmpipe/lp_setup.c b/src/gallium/drivers/llvmpipe/lp_setup.c
index b0873694732..e72e119c8a1 100644
--- a/src/gallium/drivers/llvmpipe/lp_setup.c
+++ b/src/gallium/drivers/llvmpipe/lp_setup.c
@@ -361,6 +361,8 @@ lp_setup_flush( struct lp_setup_context *setup,
if (fence) {
lp_fence_reference((struct lp_fence **)fence, setup->last_fence);
+ if (!*fence)
+ *fence = (struct pipe_fence_handle *)lp_fence_create(0);