diff --git a/MobileGL/MG_Backend/DirectVulkan/Renderer/SwapchainManager.cpp b/MobileGL/MG_Backend/DirectVulkan/Renderer/SwapchainManager.cpp
index 64393d16..2c82d756 100644
--- a/MobileGL/MG_Backend/DirectVulkan/Renderer/SwapchainManager.cpp
+++ b/MobileGL/MG_Backend/DirectVulkan/Renderer/SwapchainManager.cpp
@@ -30,6 +30,7 @@ namespace MobileGL::MG_Backend::DirectVulkan::VkManager {
 
         VkExtent2D ChooseExtent(const VkSurfaceCapabilitiesKHR& caps, ANativeWindow* window) {
             if (caps.currentExtent.width != UINT32_MAX) return caps.currentExtent;
+            // try to get frontend viewport size
             VkExtent2D extent{640, 480};
 #ifdef VK_USE_PLATFORM_ANDROID_KHR
             if (window) {
@@ -45,16 +46,22 @@ namespace MobileGL::MG_Backend::DirectVulkan::VkManager {
         }
     } // namespace
 
-    SwapchainManager::~SwapchainManager() { DestroySwapchain(); }
+    SwapchainManager::~SwapchainManager() {
+        DestroySwapchain();
+    }
 
-    void SwapchainManager::Initialize() { CreateSwapchain(VK_NULL_HANDLE); }
+    void SwapchainManager::Initialize() {
+        CreateSwapchain(VK_NULL_HANDLE);
+    }
 
     void SwapchainManager::Recreate() {
         DestroySwapchain();
         CreateSwapchain(VK_NULL_HANDLE);
     }
 
-    void SwapchainManager::SetFramebuffers(Vector<VkFramebuffer>&& framebuffers) { m_framebuffers = Move(framebuffers); }
+    void SwapchainManager::SetFramebuffers(Vector<VkFramebuffer>&& framebuffers) {
+        m_framebuffers = Move(framebuffers);
+    }
 
     void SwapchainManager::DestroySwapchain() {
         auto device = m_ctx.GetDevice();
@@ -102,7 +109,12 @@ namespace MobileGL::MG_Backend::DirectVulkan::VkManager {
 
         VkSurfaceFormatKHR surfaceFormat = ChooseSurfaceFormat(formats);
         VkPresentModeKHR presentMode = ChoosePresentMode(modes);
-        VkExtent2D extent = ChooseExtent(caps, m_ctx.GetWindow());
+        VkExtent2D extent;
+        if (m_viewportSize.x() == 0 || m_viewportSize.y() == 0) {
+            extent = ChooseExtent(caps, m_ctx.GetWindow());
+        } else {
+            extent = {m_viewportSize.x(), m_viewportSize.y()};
+        }
 
         Uint32 imageCount = caps.minImageCount + 1;
         if (caps.maxImageCount > 0 && imageCount > caps.maxImageCount) imageCount = caps.maxImageCount;
diff --git a/MobileGL/MG_Backend/DirectVulkan/Renderer/SwapchainManager.h b/MobileGL/MG_Backend/DirectVulkan/Renderer/SwapchainManager.h
index c32bd3ca..7434cfdd 100644
--- a/MobileGL/MG_Backend/DirectVulkan/Renderer/SwapchainManager.h
+++ b/MobileGL/MG_Backend/DirectVulkan/Renderer/SwapchainManager.h
@@ -8,6 +8,7 @@
 
 #pragma once
 #include <Includes.h>
+#include "MG_Util/Math/VectorTypes.h"
 #include "VulkanContext.h"
 #include "VkCommon.h"
 
@@ -22,6 +23,7 @@ namespace MobileGL::MG_Backend::DirectVulkan::VkManager {
 
         void Initialize();
         void Recreate();
+        void SetViewportSize(const UintVec2& size) { m_viewportSize = size; }
 
         VkSwapchainKHR GetSwapchain() const { return m_swapchain; }
         VkFormat GetFormat() const { return m_format; }
@@ -31,6 +33,7 @@ namespace MobileGL::MG_Backend::DirectVulkan::VkManager {
         const Vector<VkFramebuffer>& GetFramebuffers() const { return m_framebuffers; }
         void SetFramebuffers(Vector<VkFramebuffer>&& framebuffers);
         Vector<VkFence>& GetImagesInFlight() { return m_imagesInFlight; }
+        const UintVec2& GetViewportSize() const { return m_viewportSize; }
 
     private:
         void CreateSwapchain(VkSwapchainKHR oldSwapchain);
@@ -44,5 +47,6 @@ namespace MobileGL::MG_Backend::DirectVulkan::VkManager {
         Vector<VkImageView> m_imageViews;
         Vector<VkFramebuffer> m_framebuffers;
         Vector<VkFence> m_imagesInFlight;
+        UintVec2 m_viewportSize{0, 0};
     };
 } // namespace MobileGL::MG_Backend::DirectVulkan::VkManager
diff --git a/MobileGL/MG_Backend/DirectVulkan/Renderer/VulkanRenderer.cpp b/MobileGL/MG_Backend/DirectVulkan/Renderer/VulkanRenderer.cpp
index 619f9527..cb664880 100644
--- a/MobileGL/MG_Backend/DirectVulkan/Renderer/VulkanRenderer.cpp
+++ b/MobileGL/MG_Backend/DirectVulkan/Renderer/VulkanRenderer.cpp
@@ -126,6 +126,10 @@ namespace MobileGL::MG_Backend::DirectVulkan {
         m_swapchain->SetFramebuffers(Move(fbs));
     }
 
+    void VulkanRenderer::SetSwapchainViewportSize(const UintVec2& size) {
+        if (m_swapchain) m_swapchain->SetViewportSize(size);
+    }
+
     void VulkanRenderer::CreateFrameResources() {
         DestroyFrameResources();
         Uint32 imageCount = static_cast<Uint32>(m_swapchain->GetImageViews().size());
@@ -242,8 +246,7 @@ namespace MobileGL::MG_Backend::DirectVulkan {
 
     void VulkanRenderer::RecordAndSubmit(Uint32 imageIndex) {
         auto& frame = *m_frames[m_currentFrame];
-        VK_VERIFY(vkWaitForFences(m_ctx.GetDevice(), 1, &frame.InFlightFence, VK_TRUE, UINT64_MAX),
-                  "vkWaitForFences");
+        VK_VERIFY(vkWaitForFences(m_ctx.GetDevice(), 1, &frame.InFlightFence, VK_TRUE, UINT64_MAX), "vkWaitForFences");
         VK_VERIFY(vkResetFences(m_ctx.GetDevice(), 1, &frame.InFlightFence), "vkResetFences");
         VK_VERIFY(vkResetCommandBuffer(frame.CommandBuffer, 0), "vkResetCommandBuffer");
 
@@ -351,7 +354,11 @@ namespace MobileGL::MG_Backend::DirectVulkan {
         DestroyPipelines();
     }
 
-    void VulkanRenderer::RenderFrame() { DrawAndPresent(); }
+    void VulkanRenderer::RenderFrame() {
+        DrawAndPresent();
+    }
 
-    void VulkanRenderer::Present() { DrawAndPresent(); }
+    void VulkanRenderer::Present() {
+        DrawAndPresent();
+    }
 } // namespace MobileGL::MG_Backend::DirectVulkan
diff --git a/MobileGL/MG_Backend/DirectVulkan/Renderer/VulkanRenderer.h b/MobileGL/MG_Backend/DirectVulkan/Renderer/VulkanRenderer.h
index 242e94b9..f2534054 100644
--- a/MobileGL/MG_Backend/DirectVulkan/Renderer/VulkanRenderer.h
+++ b/MobileGL/MG_Backend/DirectVulkan/Renderer/VulkanRenderer.h
@@ -27,6 +27,7 @@ namespace MobileGL::MG_Backend::DirectVulkan {
         void Initialize();
         void RenderFrame();
         void Present();
+        void SetSwapchainViewportSize(const UintVec2& size);
 
         VkPipeline CreateGraphicsPipelineFromSpv(const String& name, const Vector<Uint>& vertexSpv,
                                                  const Vector<Uint>& fragmentSpv);
diff --git a/MobileGL/MG_Backend/DirectVulkan/TmpImpl.cpp b/MobileGL/MG_Backend/DirectVulkan/TmpImpl.cpp
index f9a0dd63..d2133b1d 100644
--- a/MobileGL/MG_Backend/DirectVulkan/TmpImpl.cpp
+++ b/MobileGL/MG_Backend/DirectVulkan/TmpImpl.cpp
@@ -8,6 +8,7 @@
 
 #include "TmpImpl.h"
 #include "MG_Backend/DirectVulkan/DirectVulkan.h"
+#include "MG_Util/Types.h"
 #include "Renderer/VkCommon.h"
 #include "Renderer/VulkanContext.h"
 #include "Renderer/SwapchainManager.h"
@@ -190,6 +191,7 @@ namespace MobileGL::MG_Backend::DirectVulkan::TmpImpl {
             Uint32 currentFrame = 0;
             Uint32 maxFramesInFlight = 2;
             Bool initialized = false;
+            UintVec2 viewportSize{0, 0};
 
             VkImage depthImage = VK_NULL_HANDLE;
             VkDeviceMemory depthMemory = VK_NULL_HANDLE;
@@ -2983,6 +2985,7 @@ namespace MobileGL::MG_Backend::DirectVulkan::TmpImpl {
             DestroyRenderPass();
             DestroyDepthResources();
 
+            g.swapchain->SetViewportSize(g.viewportSize);
             g.swapchain->Recreate();
             CreateDepthResources();
             CreateRenderPass();
@@ -3152,20 +3155,14 @@ namespace MobileGL::MG_Backend::DirectVulkan::TmpImpl {
         }
 
         VkViewport vp{};
-        if (rs->Viewport.z() > 0 && rs->Viewport.w() > 0) {
-            vp.x = static_cast<Float>(rs->Viewport.x());
-            vp.y = static_cast<Float>(rs->Viewport.y());
-            vp.width = static_cast<Float>(rs->Viewport.z());
-            vp.height = static_cast<Float>(rs->Viewport.w());
-        } else {
-            vp.x = 0.0f;
-            vp.y = 0.0f;
-            vp.width = static_cast<Float>(g.activeExtent.width);
-            vp.height = static_cast<Float>(g.activeExtent.height);
-        }
+        vp.x = 0.0f;
+        vp.y = 0.0f;
+        vp.width = static_cast<Float>(g.activeExtent.width);
+        vp.height = static_cast<Float>(g.activeExtent.height);
         vp.minDepth = 0.0f;
         vp.maxDepth = 1.0f;
         vkCmdSetViewport(frame->CommandBuffer, 0, 1, &vp);
+        g.viewportSize = {(Uint)rs->Viewport.z(), (Uint)rs->Viewport.w()};
 
         VkRect2D scissor{};
         if (rs->ScissorTestEnabled) {
diff --git a/MobileGL/MG_Impl/EGLImpl/EGLForVulkan/EGLForVulkan.cpp b/MobileGL/MG_Impl/EGLImpl/EGLForVulkan/EGLForVulkan.cpp
index 80b34546..8462a4e4 100644
--- a/MobileGL/MG_Impl/EGLImpl/EGLForVulkan/EGLForVulkan.cpp
+++ b/MobileGL/MG_Impl/EGLImpl/EGLForVulkan/EGLForVulkan.cpp
@@ -94,7 +94,7 @@ namespace MobileGL {
             MG_Backend::DirectVulkan::pVulkanRenderer = MakeUnique<MG_Backend::DirectVulkan::VulkanRenderer>(window);
             MG_Backend::DirectVulkan::pVulkanRenderer->Initialize();
 
-            PrepareDemoRes(); // for demo use
+            // PrepareDemoRes(); // for demo use
         }
 
         EGLSurface CreateWindowSurface(EGLDisplay dpy, EGLConfig config, NativeWindowType window,