minimal example of 15ms lag

src/vkprocessor.rs

@@ -1,12 +1,13 @@
 use vulkano::command_buffer::{AutoCommandBufferBuilder, DynamicState};
 use vulkano::device::{Device, DeviceExtensions, QueuesIter, Queue};
 use vulkano::instance::{Instance, PhysicalDevice};
-use vulkano::sync::{GpuFuture, FlushError};
+use vulkano::sync::{GpuFuture, FlushError, NowFuture};
+use vulkano::sync::now;
 use vulkano::sync;
 use std::sync::Arc;
 use vulkano::swapchain::{Swapchain, PresentMode, SurfaceTransform, Surface, SwapchainCreationError, AcquireError, Capabilities};
 use vulkano::image::swapchain::SwapchainImage;
-use winit::{Window};
+use winit::Window;
 use crate::compu_state::CompuState;
 use vulkano::image::ImageUsage;
 use crate::compu_frame::CompuFrame;
@@ -16,7 +17,6 @@ use crate::compu_kernel::{CompuKernel, CompuKernelHandle};
 use crate::compu_buffer::{CompuBuffers, CompuBufferHandle};
 
 pub struct VkProcessor<'a> {
-
     // Vulkan state fields
     pub instance: Arc<Instance>,
     pub physical: PhysicalDevice<'a>,
@@ -38,7 +38,6 @@ pub struct VkProcessor<'a> {
 
 
 impl<'a> VkProcessor<'a> {
-
     pub fn new(instance: &'a Arc<Instance>, surface: &'a Arc<Surface<Window>>) -> VkProcessor<'a> {
         let physical = PhysicalDevice::enumerate(instance).next().unwrap();
 
@@ -141,10 +140,7 @@ impl<'a> VkProcessor<'a> {
         self.compute_state.new_kernel(String::from("simple-homogenize.compute"), self.device.clone());
         self.compute_state.new_kernel(String::from("simple-edge.compute"), self.device.clone());
     }
-    pub fn preload_shaders(&mut self) {
-
-    }
-
+    pub fn preload_shaders(&mut self) {}
     pub fn get_texture_handle(&self, texture_name: String) -> Option<Arc<CanvasTextureHandle>> {
         self.canvas.get_texture_handle(texture_name)
     }
@@ -183,10 +179,11 @@ impl<'a> VkProcessor<'a> {
                compute_frame: CompuFrame,
     )
                -> Box<dyn GpuFuture> {
+        {
+            let g = hprof::enter("Waiting at queue");
+            self.queue.wait();
+        }
 
-        // take the canvas frame and create the vertex buffers
-        // TODO: This performs gpu buffer creation. Shouldn't be in hotpath
-        self.canvas.draw(canvas_frame);
 
         let mut framebuffers =
             self.canvas.window_size_dependent_setup(&self.swapchain_images.clone().unwrap().clone());
@@ -214,20 +211,33 @@ impl<'a> VkProcessor<'a> {
             Err(err) => panic!("{:?}", err)
         };
 
+        let future = frame_future.join(acquire_future);
+        {
+            let g = hprof::enter("Canvas creates GPU buffers");
+            // take the canvas frame and create the vertex buffers
+            // TODO: This performs gpu buffer creation. Shouldn't be in hotpath
+            self.canvas.draw(canvas_frame);
+        }
+
         let mut command_buffer =
             AutoCommandBufferBuilder::primary_one_time_submit(self.device.clone(), self.queue.family()).unwrap();
 
+        let g = hprof::enter("Push compute commands to command buffer");
         // Add the compute commands
-        let mut command_buffer = self.compute_state.compute_commands(compute_frame, command_buffer, &self.canvas);
+      //  let mut command_buffer = self.compute_state.compute_commands(compute_frame, command_buffer, &self.canvas);
+        drop(g);
 
+        let g = hprof::enter("Push draw commands to command buffer");
         // Add the draw commands
-        let mut command_buffer = self.canvas.draw_commands(command_buffer, framebuffers, image_num);
+     //   let mut command_buffer = self.canvas.draw_commands(command_buffer, framebuffers, image_num);
+        drop(g);
 
         // And build
         let command_buffer = command_buffer.build().unwrap();
 
         // Wait on the previous frame, then execute the command buffer and present the image
-        let future = frame_future.join(acquire_future)
+
+        let future = future //frame_future.join(acquire_future)
             .then_execute(self.queue.clone(), command_buffer).unwrap()
             .then_swapchain_present(self.queue.clone(), self.swapchain.clone().unwrap().clone(), image_num)
             .then_signal_fence_and_flush();