Feature: Allow configuring waiting on frame flushing in proxy

include/mgba/feature/video-logger.h

@@ -57,6 +57,7 @@ struct mVideoLogger {
 	void* dataContext;
 
 	bool block;
+	bool waitOnFlush;
 	void (*init)(struct mVideoLogger*);
 	void (*deinit)(struct mVideoLogger*);
 	void (*reset)(struct mVideoLogger*);

src/feature/video-logger.c

@@ -119,7 +119,6 @@ static inline size_t _roundUp(size_t value, int shift) {
 void mVideoLoggerRendererCreate(struct mVideoLogger* logger, bool readonly) {
 	if (readonly) {
 		logger->writeData = _writeNull;
-		logger->block = true;
 	} else {
 		logger->writeData = _writeData;
 	}
@@ -134,6 +133,9 @@ void mVideoLoggerRendererCreate(struct mVideoLogger* logger, bool readonly) {
 	logger->unlock = NULL;
 	logger->wait = NULL;
 	logger->wake = NULL;
+
+	logger->block = readonly;
+	logger->waitOnFlush = !readonly;
 }
 
 void mVideoLoggerRendererInit(struct mVideoLogger* logger) {
@@ -263,7 +265,7 @@ void mVideoLoggerRendererFlush(struct mVideoLogger* logger) {
 		0xDEADBEEF,
 	};
 	logger->writeData(logger, &dirty, sizeof(dirty));
-	if (logger->wait) {
+	if (logger->waitOnFlush && logger->wait) {
 		logger->wait(logger);
 	}
 }

src/platform/qt/DisplayGL.cpp

@@ -435,6 +435,10 @@ void PainterGL::draw() {
 	mCoreSync* sync = &m_context->thread()->impl->sync;
 	mCoreSyncWaitFrameStart(sync);
 	dequeue();
+	if (m_videoProxy) {
+		// Only block on the next frame if we're trying to run at roughly 60fps via audio
+		m_videoProxy->setBlocking(sync->audioWait && std::abs(60.f - sync->fpsTarget) < 0.1f);
+	}
 	if (!m_delayTimer.isValid()) {
 		m_delayTimer.start();
 	} else if (sync->audioWait || sync->videoFrameWait) {

src/platform/qt/VideoProxy.cpp

@@ -14,6 +14,7 @@ using namespace QGBA;
 VideoProxy::VideoProxy() {
 	mVideoLoggerRendererCreate(&m_logger.d, false);
 	m_logger.d.block = true;
+	m_logger.d.waitOnFlush = false;
 
 	m_logger.d.init = &cbind<&VideoProxy::init>;
 	m_logger.d.reset = &cbind<&VideoProxy::reset>;

src/platform/qt/VideoProxy.h

@@ -24,6 +24,7 @@ public:
 
 	void attach(CoreController*);
 	void detach(CoreController*);
+	void setBlocking(bool block) { m_logger.d.waitOnFlush = block; }
 
 signals:
 	void dataAvailable();