OpenGL: Separate submit/present for this backend as well

Common/GPU/OpenGL/GLRenderManager.cpp

@@ -377,7 +377,7 @@ void GLRenderManager::Finish() {
 	frameData_[curFrame].deleter.Take(deleter_);
 
 	VLOG("PUSH: Finish, pushing task. curFrame = %d", curFrame);
-	GLRRenderThreadTask *task = new GLRRenderThreadTask(GLRRunType::PRESENT);
+	GLRRenderThreadTask *task = new GLRRenderThreadTask(GLRRunType::SUBMIT);
 	task->frame = curFrame;
 
 	{
@@ -414,10 +414,56 @@ void GLRenderManager::Finish() {
 	insideFrame_ = false;
 }
 
+void GLRenderManager::Present() {
+	int curFrame = GetCurFrame();
+	GLRRenderThreadTask *task = new GLRRenderThreadTask(GLRRunType::PRESENT);
+	task->frame = curFrame;
+	std::unique_lock<std::mutex> lock(pushMutex_);
+	renderThreadQueue_.push(task);
+}
+
 // Render thread. Returns true if the caller should handle a swap.
 bool GLRenderManager::Run(GLRRenderThreadTask &task) {
 	GLFrameData &frameData = frameData_[task.frame];
 
+	if (task.runType == GLRRunType::PRESENT) {
+		bool swapRequest = false;
+		if (!frameData.skipSwap) {
+			if (swapIntervalChanged_) {
+				swapIntervalChanged_ = false;
+				if (swapIntervalFunction_) {
+					swapIntervalFunction_(swapInterval_);
+				}
+			}
+			// This is the swapchain framebuffer flip.
+			if (swapFunction_) {
+				VLOG("  PULL: SwapFunction()");
+				swapFunction_();
+				if (!retainControl_) {
+					// get out of here.
+					swapRequest = true;
+				}
+			} else {
+				VLOG("  PULL: SwapRequested");
+				swapRequest = true;
+			}
+		} else {
+			frameData.skipSwap = false;
+		}
+		frameData.hasBegun = false;
+
+		VLOG("  PULL: Frame %d.readyForFence = true", task.frame);
+
+		{
+			std::lock_guard<std::mutex> lock(frameData.fenceMutex);
+			frameData.readyForFence = true;
+			frameData.fenceCondVar.notify_one();
+			// At this point, we're done with this framedata (for now).
+		}
+
+		return swapRequest;
+	}
+
 	if (!frameData.hasBegun) {
 		frameData.hasBegun = true;
 
@@ -461,43 +507,8 @@ bool GLRenderManager::Run(GLRRenderThreadTask &task) {
 		}
 	}
 
-	bool swapRequest = false;
-
 	switch (task.runType) {
-	case GLRRunType::PRESENT:
+	case GLRRunType::SUBMIT:
-		if (!frameData.skipSwap) {
-			if (swapIntervalChanged_) {
-				swapIntervalChanged_ = false;
-				if (swapIntervalFunction_) {
-					swapIntervalFunction_(swapInterval_);
-				}
-			}
-			// This is the swapchain framebuffer flip.
-			if (swapFunction_) {
-				VLOG("  PULL: SwapFunction()");
-				swapFunction_();
-				if (!retainControl_) {
-					// get out of here.
-					swapRequest = true;
-				}
-			} else {
-				VLOG("  PULL: SwapRequested");
-				swapRequest = true;
-			}
-		} else {
-			frameData.skipSwap = false;
-		}
-		frameData.hasBegun = false;
-
-		VLOG("  PULL: Frame %d.readyForFence = true", task.frame);
-
-		{
-			std::lock_guard<std::mutex> lock(frameData.fenceMutex);
-			frameData.readyForFence = true;
-			frameData.fenceCondVar.notify_one();
-			// At this point, we're done with this framedata (for now).
-		}
-
 		break;
 
 	case GLRRunType::SYNC:
@@ -516,7 +527,7 @@ bool GLRenderManager::Run(GLRRenderThreadTask &task) {
 		_assert_(false);
 	}
 	VLOG("  PULL: ::Run(): Done running tasks");
-	return swapRequest;
+	return false;
 }
 
 void GLRenderManager::FlushSync() {

Common/GPU/OpenGL/GLRenderManager.h

@@ -198,6 +198,7 @@ public:
 };
 
 enum class GLRRunType {
+	SUBMIT,
 	PRESENT,
 	SYNC,
 	EXIT,
@@ -253,7 +254,8 @@ public:
 	// Makes sure that the GPU has caught up enough that we can start writing buffers of this frame again.
 	void BeginFrame(bool enableProfiling);
 	// Can run on a different thread!
-	void Finish(); 
+	void Finish();
+	void Present();
 
 	// Creation commands. These were not needed in Vulkan since there we can do that on the main thread.
 	// We pass in width/height here even though it's not strictly needed until we support glTextureStorage

Common/GPU/OpenGL/thin3d_gl.cpp

@@ -803,6 +803,7 @@ void OpenGLContext::EndFrame() {
 }
 
 void OpenGLContext::Present() {
+	renderManager_.Present();
 	frameCount_++;
 }
 

libretro/libretro.cpp

@@ -1172,8 +1172,10 @@ namespace Libretro
 
       gpu->EndHostFrame();
 
-      if (ctx->GetDrawContext())
+      if (ctx->GetDrawContext()) {
          ctx->GetDrawContext()->EndFrame();
+         ctx->GetDrawContext()->Present();
+      }
    }
 
    static void EmuThreadFunc()