separate frame pacing from window processing

Author: malytomas

sources/include/cage-engine/graphicsCommon.h

@@ -33,9 +33,11 @@ namespace cage
 
 	struct CAGE_ENGINE_API GraphicsFrameStatistics : public GraphicsCommandBufferStatistics
 	{
-		// previous frames (microseconds, multiple frames ago)
-		uint64 frameExecution = 0; // time spent processing the frame
-		uint64 frameDuration = 0; // time elapsed start-to-start
+		// frame duration measured on gpu, few frames ago
+		uint64 gpuTime = 0;
+
+		// last frame duration measured on cpu
+		uint64 frameTime = 0;
 
 		// outstanding pipelines waiting for compilation
 		uint32 pipelinesCompiling = 0;

sources/include/cage-engine/graphicsDevice.h

@@ -16,21 +16,13 @@ namespace cage
 	class Window;
 	class Texture;
 
-	struct GraphicsFrameData : public GraphicsFrameStatistics
-	{
-		// next frame
-		Holder<Texture> targetTexture;
-	};
-
 	class CAGE_ENGINE_API GraphicsDevice : private Immovable
 	{
 	public:
-		void processEvents();
-
-		void insertCommandBuffer(wgpu::CommandBuffer &&commands, const GraphicsCommandBufferStatistics &statistics);
-		void submitCommandBuffers();
-		GraphicsFrameData nextFrame(Window *window);
 		void wait(const wgpu::Future &future);
+		void insertCommandBuffer(wgpu::CommandBuffer &&commands, const GraphicsCommandBufferStatistics &statistics);
+		Holder<Texture> nextWindow(Window *window);
+		GraphicsFrameStatistics nextFrame();
 
 		Holder<wgpu::Device> nativeDeviceNoLock();
 		Holder<wgpu::Device> nativeDevice(); // locks the device for thread-safe access