FUCK YEAH! We have colored window!

cmd/main.go

@@ -8,7 +8,6 @@ import (
 
 	vk "github.com/christerso/vulkan-go/vk"
 	"github.com/ebitengine/purego"
-	sdl "github.com/jupiterrider/purego-sdl3/sdl"
 )
 
 const (
@@ -23,8 +22,8 @@ const (
 	windowVulkan    uint64 = 0x0000000010000000
 	windowResizable uint64 = 0x0000000000000020
 
-	eventQuit    uint32 = 0x100
-	eventKeyDown uint32 = 0x300
+	sdlEventQuit    uint32 = 0x100
+	sdlEventKeyDown uint32 = 0x300
 	keyEscape       uint32 = 0x1B
 )
 
@@ -87,22 +86,6 @@ func cbytes(s string) *byte {
 
 func main() {
 	runtime.LockOSThread()
-	// SDL init
-	// if !sdl.Init(sdl.InitVideo) {
-	// 	log.Fatal(sdl.GetError())
-	// }
-	// defer sdl.Quit()
-
-	// window := sdl.CreateWindow(
-	// 	fmt.Sprintf("%s ver. %s", APP_NAME, APP_VER),
-	// 	1280,
-	// 	720,
-	// 	sdl.WindowVulkan|sdl.WindowResizable,
-	// )
-	// if window == nil {
-	// 	log.Fatal(sdl.GetError())
-	// }
-	// defer sdl.DestroyWindow(window)
 	if err := loadSDLMissing(); err != nil {
 		panic(err)
 	}
@@ -181,13 +164,13 @@ func main() {
 		GraphicsFamily: gfx,
 		Extensions:     []string{"VK_KHR_swapchain"},
 	})
+	fmt.Println("vkQueue=", vkQueue)
 	if err != nil {
 		panic(err)
 	}
 	defer vkDevice.Destroy()
-	defer vkDevice.WaitIdle()
 	// TODO: colorspace & render pass
-	var vkFormat vk.Format
+	var vkFormat vk.Format = vk.FormatUndefined
 	var vkColorSpace uint32
 	formats, _ := vkPhysDevice.SurfaceFormats(vkSurf)
 	for _, f := range formats {
@@ -196,7 +179,12 @@ func main() {
 			vkColorSpace = f.ColorSpace
 		}
 	}
-	var vkPresentMode vk.PresentMode
+	if vkFormat == vk.FormatUndefined {
+		vkFormat = formats[0].Format
+		vkColorSpace = formats[0].ColorSpace
+	}
+
+	var vkPresentMode vk.PresentMode = vk.PresentModeFIFO
 	modes, _ := vkPhysDevice.SurfacePresentModes(vkSurf)
 	for _, m := range modes {
 		if m == vk.PresentModeMailbox {
@@ -220,17 +208,189 @@ func main() {
 	if err != nil {
 		panic(err.Error())
 	}
+	fmt.Println(vkCommands)
+	defer vkDevice.WaitIdle()
+	// Vulkan Surface Capabilities
+	caps, err := vkPhysDevice.SurfaceCapabilities(vkSurf)
+	if err != nil {
+		panic(err.Error())
+	}
+	//compute swapchain extent
+	var w, h int32 = WIN_WIDTH, WIN_HEIGHT
+	if !sdlGetWindowSizeInPixels(windowHandler, &w, &h) {
+		log.Fatalf("SDL_GetWindowSizeInPixels: %s", sdlError())
+	}
+	if w < int32(caps.MinImageExtent.Width) {
+		w = int32(caps.MinImageExtent.Width)
+	}
+	if h < int32(caps.MinImageExtent.Height) {
+		h = int32(caps.MinImageExtent.Height)
+	}
+	if w > int32(caps.MaxImageExtent.Width) {
+		w = int32(caps.MaxImageExtent.Width)
+	}
+	if h > int32(caps.MaxImageExtent.Height) {
+		h = int32(caps.MaxImageExtent.Height)
+	}
+	vkExtent := vk.Extent2D{Width: uint32(w), Height: uint32(h)}
+	// Vulkan swapchain (pool of presentable images, that OS and GPU share)
+	vkSwapchain, err := vkDevice.CreateSwapchain(vk.SwapchainConfig{
+		Surface:       vkSurf,
+		MinImageCount: caps.MinImageCount,
+		Format:        vkFormat,
+		ColorSpace:    vkColorSpace,
+		Extent:        vkExtent,
+		PresentMode:   vkPresentMode,
+		PreTransform:  caps.CurrentTransform,
+	})
+	if err != nil {
+		panic(err.Error())
+	}
+	defer vkDevice.DestroySwapchain(vkSwapchain)
+
+	swapImages, err := vkDevice.SwapchainImages(vkSwapchain)
+	if err != nil {
+		panic(err.Error())
+	}
+	// one image view per swapchain. Image = raw GPU memory with a format
+	swapViews := make([]vk.ImageView, len(swapImages))
+	for i, img := range swapImages {
+		v, err := vkDevice.CreateImageView(img, vkFormat, vk.AspectColor)
+		if err != nil {
+			panic(err.Error())
+		}
+		swapViews[i] = v
+	}
+	defer func() {
+		for _, v := range swapViews {
+			vkDevice.DestroyImageView(v)
+		}
+	}()
+	// depth image + view
+	depthImg, err := vkDevice.CreateImage2D(
+		vkPhysDevice, vk.FormatD32Sfloat, vkExtent, vk.ImageUsageDepthStencilAttachment)
+	if err != nil {
+		panic(err.Error())
+	}
+	defer vkDevice.DestroyImage(depthImg)
+
+	depthView, err := vkDevice.CreateImageView(depthImg.Image, vk.FormatD32Sfloat, vk.AspectDepth)
+	if err != nil {
+		panic(err.Error())
+	}
+	defer vkDevice.DestroyImageView(depthView)
+
+	// frame buffer i.e. binding between RenderPass and actual ImageViews
+	fbs := make([]vk.Framebuffer, len(swapViews))
+	for i, cv := range swapViews {
+		fb, err := vkDevice.CreateFramebuffer(vkRenderPass, []vk.ImageView{cv, depthView}, vkExtent)
+		if err != nil {
+			panic(err.Error())
+		}
+		fbs[i] = fb
+	}
+	defer func() {
+		for _, fb := range fbs {
+			vkDevice.DestroyFramebuffer(fb)
+		}
+	}()
+	// syncs
+	// Semaphores sync GPU work to GPU work (you never wait on these from the CPU). You need two:
+	// - imageAvailable — AcquireNextImage signals it when a swapchain image is ready to render into.
+	// Your draw submission waits on it before touching color.
+	// - renderFinished — your draw submission signals it when rendering is done.
+	// Present waits on it before showing the frame.
+	// Fences sync GPU work to CPU. You need one:
+	// - inFlight — your submission signals it when the GPU is done with the command buffer.
+	// Your CPU waits on it before re-recording that same command buffer.
+	// It's created signaled so the very first frame's wait returns immediately
+	// (otherwise you'd deadlock waiting for work that hasn't been submitted yet).
+	imageAvailable, err := vkDevice.CreateSemaphore()
+	if err != nil {
+		panic(err.Error())
+	}
+	defer vkDevice.DestroySemaphore(imageAvailable)
+
+	renderFinished, err := vkDevice.CreateSemaphore()
+	if err != nil {
+		panic(err.Error())
+	}
+	defer vkDevice.DestroySemaphore(renderFinished)
+
+	inFlight, err := vkDevice.CreateFence(true)
+	if err != nil {
+		panic(err.Error())
+	}
+	defer vkDevice.DestroyFence(inFlight)
 
 	// Core Loop
 	running := true
 	for running {
-		var event sdl.Event
-
-		for sdl.PollEvent(&event) {
-			switch event.Type() {
-			case sdl.EventQuit:
+		var event [128]byte
+		for sdlPollEvent(unsafe.Pointer(&event[0])) {
+			eventType := *(*uint32)(unsafe.Pointer(&event[0]))
+			if eventType == sdlEventQuit {
 				running = false
 			}
 		}
+		if !running {
+			break
+		}
+		// Acquire the next swapchain image
+		imageIndex, r := vkDevice.AcquireNextImage(vkSwapchain, imageAvailable, ^uint64(0))
+		if !r.Ok() {
+			panic(fmt.Errorf("acquire: %v", r))
+		}
+		// Wait until GPU is done with our command buffer, then reset fence
+		if err := vkDevice.WaitFence(inFlight, ^uint64(0)); err != nil {
+			panic(err)
+		}
+		if err := vkDevice.ResetFence(inFlight); err != nil {
+			panic(err)
+		}
+
+		// Record: clear color & depth attachments
+		cmd := vkCommands[0]
+		if err := cmd.Reset(); err != nil {
+			panic(err)
+		}
+		if err := cmd.Begin(vk.CommandBufferOneTimeSubmit); err != nil {
+			panic(err)
+		}
+		cmd.BeginRenderPass(
+			vkRenderPass,
+			fbs[imageIndex],
+			vk.Rect2D{Offset: vk.Offset2D{X: 0, Y: 0}, Extent: vkExtent},
+			[]vk.ClearValue{
+				vk.ClearColor(0.0, 0.4, 0.7, 1.0),
+				vk.ClearDepthStencil(1.0, 0),
+			},
+		)
+		cmd.EndRenderPass()
+		if err := cmd.End(); err != nil {
+			panic(err)
+		}
+		// Submit: wait on imageAvailable, signal RenderFinished + inFlight
+		if err := vkQueue.Submit(vk.SubmitConfig{
+			Wait:      imageAvailable,
+			WaitStage: vk.StageColorAttachmentOutput,
+			Command:   cmd,
+			Signal:    renderFinished,
+			Fence:     inFlight,
+		}); err != nil {
+			panic(err)
+		}
+		// Present. Wait on renderFinished
+		r = vkQueue.Present(vkSwapchain, imageIndex, renderFinished)
+		if r == vk.ErrorOutOfDateKHR || r == vk.SuboptimalKHR {
+			break
+		}
+		if !r.Ok() {
+			panic(fmt.Errorf("present: %v", r))
+		}
+		// Make sure GPU is idle before any deferred destruction runs
+		if err := vkDevice.WaitIdle(); err != nil {
+			panic(err)
+		}
 	}
 }