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pointer/hw: rollback the swapchain on multiple renders without a commit

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fixes the hack
This commit is contained in:
Vaxry 2024-07-22 19:19:37 +02:00
parent f17f8b219c
commit 4c3b035162
2 changed files with 21 additions and 6 deletions
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21
src/managers/PointerManager.cpp
View file

@ -24,6 +24,14 @@ CPointerManager::CPointerManager() {
},
nullptr);
});
hooks.monitorPreRender = g_pHookSystem->hookDynamic("preRender", [this](void* self, SCallbackInfo& info, std::any data) {
auto state = stateFor(std::any_cast<CMonitor*>(data)->self.lock());
if (!state)
return;
state->cursorRendered = false;
});
}
void CPointerManager::lockSoftwareAll() {
@ -373,10 +381,7 @@ SP<Aquamarine::IBuffer> CPointerManager::renderHWCursorBuffer(SP<CPointerManager
auto options = state->monitor->cursorSwapchain->currentOptions();
options.size = maxSize;
// TODO: this is a band-aid. If the current cursor image has not yet been committed (no rendering has yet been done)
// we should revert the swapchain and avoid rendering to the front buffer.
// as a band-aid, extend the swapchain to 3 as we sometimes double-render on a cursor shape change.
options.length = 3;
options.length = 2;
options.scanout = true;
options.cursor = true;
options.multigpu = state->monitor->output->getBackend()->preferredAllocator()->drmFD() != g_pCompositor->m_iDRMFD;
@ -389,6 +394,14 @@ SP<Aquamarine::IBuffer> CPointerManager::renderHWCursorBuffer(SP<CPointerManager
}
}
// if we already rendered the cursor, revert the swapchain to avoid rendering the cursor over
// the current front buffer
// this flag will be reset in the preRender hook, so when we commit this buffer to KMS
if (state->cursorRendered)
state->monitor->cursorSwapchain->rollback();
state->cursorRendered = true;
auto buf = state->monitor->cursorSwapchain->next(nullptr);
if (!buf) {
Debug::log(TRACE, "Failed to acquire a buffer from the cursor swapchain");

2
src/managers/PointerManager.hpp
View file

@ -165,6 +165,7 @@ class CPointerManager {
CBox box; // logical
bool entered = false;
bool hwApplied = false;
bool cursorRendered = false;
SP<Aquamarine::IBuffer> cursorFrontBuffer;
};
@ -177,6 +178,7 @@ class CPointerManager {
struct {
SP<HOOK_CALLBACK_FN> monitorAdded;
SP<HOOK_CALLBACK_FN> monitorPreRender;
} hooks;
};