rend: last frame was sometimes presented after the game is stopped

When the clearLastFrame flag is set, renderers should return false from
Present() and RenderLastFrame() until a new frame is rendered.

core/rend/dx11/dx11_renderer.cpp

@@ -525,6 +525,7 @@ bool DX11Renderer::Render()
 #endif
 		frameRendered = true;
 		frameRenderedOnce = true;
+		clearLastFrame = false;
 	}
 
 	return !is_rtt;
@@ -1040,6 +1041,7 @@ void DX11Renderer::RenderFramebuffer(const FramebufferInfo& info)
 #endif
 	frameRendered = true;
 	frameRenderedOnce = true;
+	clearLastFrame = false;
 }
 
 void DX11Renderer::setBaseScissor()

core/rend/dx11/dx11_renderer.h

@@ -42,10 +42,9 @@ struct DX11Renderer : public Renderer
 
 	bool Present() override
 	{
-		if (!frameRendered)
+		if (!frameRendered || clearLastFrame)
 			return false;
 		frameRendered = false;
-		clearLastFrame = false;
 #ifndef LIBRETRO
 		imguiDriver->setFrameRendered();
 #else

core/rend/dx11/oit/dx11_oitrenderer.cpp

@@ -694,6 +694,7 @@ struct DX11OITRenderer : public DX11Renderer
 #endif
 			frameRendered = true;
 			frameRenderedOnce = true;
+			clearLastFrame = false;
 		}
 
 		return !is_rtt;

core/rend/dx9/d3d_renderer.cpp

@@ -302,6 +302,7 @@ void D3DRenderer::RenderFramebuffer(const FramebufferInfo& info)
 	drawOSD();
 	frameRendered = true;
 	frameRenderedOnce = true;
+	clearLastFrame = false;
 	theDXContext.setFrameRendered();
 }
 
@@ -1181,6 +1182,7 @@ bool D3DRenderer::Render()
 		drawOSD();
 		frameRendered = true;
 		frameRenderedOnce = true;
+		clearLastFrame = false;
 		theDXContext.setFrameRendered();
 	}
 

core/rend/dx9/d3d_renderer.h

@@ -106,11 +106,10 @@ struct D3DRenderer : public Renderer
 	bool RenderLastFrame() override;
 	bool Present() override
 	{
-		if (!frameRendered)
+		if (!frameRendered || clearLastFrame)
 			return false;
 		imguiDriver->setFrameRendered();
 		frameRendered = false;
-		clearLastFrame = false;
 		return true;
 	}
 	BaseTextureCacheData *GetTexture(TSP tsp, TCW tcw) override;

core/rend/gl4/gles.cpp

@@ -713,6 +713,7 @@ struct OpenGL4Renderer : OpenGLRenderer
 		if (!config::EmulateFramebuffer)
 		{
 			frameRendered = true;
+			clearLastFrame = false;
 			drawOSD();
 			renderVideoRouting();
 		}

core/rend/gles/gldraw.cpp

@@ -688,6 +688,7 @@ void OpenGLRenderer::RenderFramebuffer(const FramebufferInfo& info)
 
 	drawOSD();
 	frameRendered = true;
+	clearLastFrame = false;
 	renderVideoRouting();
 	restoreCurrentFramebuffer();
 }

core/rend/gles/gles.cpp

@@ -1361,6 +1361,7 @@ bool OpenGLRenderer::Render()
 	if (!config::EmulateFramebuffer)
 	{
 		frameRendered = true;
+		clearLastFrame = false;
 		drawOSD();
 		renderVideoRouting();
 	}

core/rend/gles/gles.h

@@ -516,12 +516,11 @@ struct OpenGLRenderer : Renderer
 
 	bool Present() override
 	{
-		if (!frameRendered)
+		if (!frameRendered || clearLastFrame)
 			return false;
 #ifndef LIBRETRO
 		imguiDriver->setFrameRendered();
 #endif
-		clearLastFrame = false;
 		frameRendered = false;
 		return true;
 	}

core/rend/vulkan/oit/oit_renderer.cpp

@@ -105,7 +105,8 @@ public:
 
 	bool Present() override
 	{
-		clearLastFrame = false;
+		if (clearLastFrame)
+			return false;
 		if (config::EmulateFramebuffer || framebufferRendered)
 			return presentFramebuffer();
 		else

core/rend/vulkan/vulkan_renderer.cpp

@@ -86,7 +86,11 @@ BaseTextureCacheData *BaseVulkanRenderer::GetTexture(TSP tsp, TCW tcw)
 
 void BaseVulkanRenderer::Process(TA_context* ctx)
 {
-	framebufferRendered = false;
+	if (!ctx->rend.isRTT) {
+		framebufferRendered = false;
+		if (!config::EmulateFramebuffer)
+			clearLastFrame = false;
+	}
 	if (resetTextureCache) {
 		textureCache.Clear();
 		resetTextureCache = false;
@@ -156,6 +160,7 @@ void BaseVulkanRenderer::RenderFramebuffer(const FramebufferInfo& info)
 	commandBuffer.end();
 	fbCommandPool.EndFrame();
 	framebufferRendered = true;
+	clearLastFrame = false;
 }
 
 void BaseVulkanRenderer::RenderVideoRouting()
@@ -300,7 +305,8 @@ public:
 
 	bool Present() override
 	{
-		clearLastFrame = false;
+		if (clearLastFrame)
+			return false;
 		if (config::EmulateFramebuffer || framebufferRendered)
 			return presentFramebuffer();
 		else