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backends/drm: work around amdgpu bugs with DCC modifiers

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See https://gitlab.freedesktop.org/mesa/mesa/-/issues/10875 for details. The workaround
can be disabled again with the KWIN_DRM_NO_DCC_WORKAROUND=1 environment variable
This commit is contained in:
Xaver Hugl 2024-04-22 17:21:19 +02:00
parent 445567f54e
commit 20d5f9bc6e
1 changed files with 9 additions and 1 deletions
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10
src/backends/drm/drm_egl_layer_surface.cpp
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@ -132,7 +132,15 @@ std::optional<OutputLayerBeginFrameInfo> EglGbmLayerSurface::startRendering(cons
if (requireAlpha && info->alphaBits == 0) { if (requireAlpha && info->alphaBits == 0) {
continue; continue;
} }
m_surface->shadowSwapchain = EglSwapchain::create(m_eglBackend->drmDevice()->allocator(), m_eglBackend->openglContext(), m_surface->gbmSwapchain->size(), it.key(), it.value()); auto mods = it.value();
if (m_eglBackend->gpu()->isAmdgpu() && qEnvironmentVariableIntValue("KWIN_DRM_NO_DCC_WORKAROUND") == 0) {
// using modifiers with DCC here causes glitches on amdgpu: https://gitlab.freedesktop.org/mesa/mesa/-/issues/10875
if (!mods.contains(DRM_FORMAT_MOD_LINEAR)) {
continue;
}
mods = {DRM_FORMAT_MOD_LINEAR};
}
m_surface->shadowSwapchain = EglSwapchain::create(m_eglBackend->drmDevice()->allocator(), m_eglBackend->openglContext(), m_surface->gbmSwapchain->size(), it.key(), mods);
if (m_surface->shadowSwapchain) { if (m_surface->shadowSwapchain) {
break; break;
} }