First imgui trys

internal/renderer/renderer.go

@@ -59,6 +59,9 @@ type Renderer struct {
 	imageAvailable vk.Semaphore
 	renderFinished vk.Semaphore
 	inFlight       vk.Fence
+
+	// Called inside render pass, after video draw
+	ImGuiDraw func(cmd vk.CommandBuffer)
 }
 
 // public params, needed to create a Renderer
@@ -441,6 +444,9 @@ func (r *Renderer) DrawFrame(videoW, videoH, stride uint32) error {
 	}
 	cmd.PushConstants(r.decodeLayout, vk.ShaderStageFragment, 0, unsafe.Pointer(&pc), 20)
 	cmd.Draw(3, 1, 0, 0)
+	if r.ImGuiDraw != nil {
+		r.ImGuiDraw(cmd)
+	}
 	cmd.EndRenderPass()
 	if err := cmd.End(); err != nil {
 		return err
@@ -465,3 +471,6 @@ func (r *Renderer) DrawFrame(videoW, videoH, stride uint32) error {
 	}
 	return nil
 }
+
+func (r *Renderer) CmdPool() vk.CommandPool   { return r.cmdPool }
+func (r *Renderer) RenderPass() vk.RenderPass { return r.renderPass }