From b8801e793d604db4903014ac0e17794ac556db17 Mon Sep 17 00:00:00 2001
From: Dmitry Sergeev <mrjitten@protonmail.com>
Date: Thu, 27 Aug 2026 21:01:31 +0300
Subject: [PATCH] initialize renderer with placeholder frame

---
 cmd/mxl-player/main.go | 104 ++++++++++++++++++++---------------------
 imgui.ini              |   4 +-
 2 files changed, 53 insertions(+), 55 deletions(-)

diff --git a/cmd/mxl-player/main.go b/cmd/mxl-player/main.go
index ba52ac4..11cba9d 100644
--- a/cmd/mxl-player/main.go
+++ b/cmd/mxl-player/main.go
@@ -28,6 +28,12 @@ const (
 	WIN_HEIGHT int32 = 720
 )
 
+const (
+	placeholderWidth  uint32 = 1
+	placeholderHeight uint32 = 1
+	placeholderStride uint32 = 4
+)
+
 type appArgs struct {
 	ShowHelp      bool
 	Domain        string
@@ -308,40 +314,46 @@ func main() {
 		defer sdl.DestroyAudioStream(audioStream)
 	}
 
-	var r *renderer.Renderer
-	if args.VideoFlowId != "" {
-		var w, h, stride uint32
-		if syncSrc != nil {
-			w, h, stride = syncSrc.Width(), syncSrc.Height(), syncSrc.Stride()
-		} else {
-			w, h, stride = videoSrc.Width(), videoSrc.Height(), videoSrc.Stride()
-		}
-		r, err = renderer.New(renderer.Config{
-			PhysDevice:     vkPhysDevice,
-			Device:         vkDevice,
-			Queue:          vkQueue,
-			Surface:        vkSurf,
-			Window:         windowHandler,
-			GraphicsFamily: gfx,
-			VideoWidth:     w,
-			VideoHeight:    h,
-			VideoStride:    stride,
-		})
-		if err != nil {
-			panic(err)
-		}
-		defer r.Destroy()
-		guiBackend, err := imgui.NewVulkanBackend(
-			vkPhysDevice, vkDevice, vkQueue, r.CmdPool(), r.RenderPass())
-		if err != nil {
-			panic(err)
-		}
-		defer guiBackend.Destroy()
-		r.ImGuiDraw = func(cmd vk.CommandBuffer) {
-			guiBackend.RecordDraw(cmd, gui.LastDrawData())
-		}
-		defer vkDevice.WaitIdle()
+	// Create renderer
+	r, err := renderer.New(renderer.Config{
+		PhysDevice:     vkPhysDevice,
+		Device:         vkDevice,
+		Queue:          vkQueue,
+		Surface:        vkSurf,
+		Window:         windowHandler,
+		GraphicsFamily: gfx,
+		VideoWidth:     placeholderWidth,
+		VideoHeight:    placeholderHeight,
+		VideoStride:    placeholderStride,
+	})
+	if err != nil {
+		panic(err)
 	}
+	defer r.Destroy()
+	// Create GUI backend
+	guiBackend, err := imgui.NewVulkanBackend(
+		vkPhysDevice,
+		vkDevice,
+		vkQueue,
+		r.CmdPool(),
+		r.RenderPass(),
+	)
+	if err != nil {
+		panic(err)
+	}
+	defer guiBackend.Destroy()
+	r.ImGuiDraw = func(cmd vk.CommandBuffer) {
+		guiBackend.RecordDraw(cmd, gui.LastDrawData())
+	}
+	if err := r.StageFrame(
+		[]byte{0, 0, 0, 255},
+		placeholderWidth,
+		placeholderHeight,
+		placeholderStride,
+	); err != nil {
+		panic(err)
+	}
+	defer vkDevice.WaitIdle()
 
 	// GUI state (accessible from doReconnect + goroutine)
 	var (
@@ -381,14 +393,6 @@ func main() {
 		if params.video != "" && params.audio != "" {
 			s, e := source.OpenSameDomainSync(params.domain, params.video, params.audio)
 			if e == nil {
-				if r != nil {
-					newSize := vk.DeviceSize(s.Stride()) * vk.DeviceSize(s.Height())
-					if newSize != r.FrameSize() {
-						if e = r.RecreateBuffers(newSize); e != nil {
-							return e
-						}
-					}
-				}
 				syncSrc = s
 				aChans = s.Channels()
 				audioBatch = uint64(s.AudioRate().Num) / uint64(s.Rate().Num)
@@ -401,14 +405,6 @@ func main() {
 		} else if params.video != "" {
 			s, e := source.Open(params.domain, params.video)
 			if e == nil {
-				if r != nil {
-					newSize := vk.DeviceSize(s.Stride()) * vk.DeviceSize(s.Height())
-					if newSize != r.FrameSize() {
-						if e = r.RecreateBuffers(newSize); e != nil {
-							return e
-						}
-					}
-				}
 				videoSrc = s
 				return nil
 			}
@@ -614,9 +610,10 @@ func main() {
 		sdl.SetWindowFullscreen(windowHandler, true)
 	}
 	var (
-		displayedVideoWidth  uint32
-		displayedVideoHeight uint32
-		displayedVideoStride uint32
+		displayedVideoWidth  uint32 = placeholderWidth
+		displayedVideoHeight uint32 = placeholderHeight
+		displayedVideoStride uint32 = placeholderStride
+		hasDisplayedVideo    bool   = false
 
 		fps        float64
 		lastIndex  uint64
@@ -699,6 +696,7 @@ func main() {
 			displayedVideoWidth = pendingFrame.Frame.Width
 			displayedVideoHeight = pendingFrame.Frame.Height
 			displayedVideoStride = pendingFrame.Frame.Stride
+			hasDisplayedVideo = true
 			hasFrame = true
 		} else if frameErr != nil &&
 			!errors.Is(frameErr, context.DeadlineExceeded) &&
@@ -738,7 +736,7 @@ func main() {
 				cimgui.Text(fmt.Sprintf("FPS: %.1f", fps))
 				cimgui.Text(fmt.Sprintf("Dropped: %d", dropped))
 				cimgui.Text(fmt.Sprintf("Index: %d", shownIndex))
-				if displayedVideoWidth != 0 && displayedVideoHeight != 0 {
+				if hasDisplayedVideo {
 					cimgui.Text(fmt.Sprintf(
 						"Video: %dx%d",
 						displayedVideoWidth,
diff --git a/imgui.ini b/imgui.ini
index 65dff5f..1332414 100644
--- a/imgui.ini
+++ b/imgui.ini
@@ -14,7 +14,7 @@ Size=200,200
 Collapsed=0
 
 [Window][Connection]
-Pos=500,330
-Size=523,153
+Pos=388,158
+Size=523,141
 Collapsed=0