fix: Error on window resize.

aster/include/aster/core/size.h

@@ -9,10 +9,31 @@
 
 struct Size2D
 {
-    u32 m_Width;
-    u32 m_Height;
+    u32 m_Width = 0;
+    u32 m_Height = 0;
+
+    Size2D() = default;
+
+    Size2D(const u32 width, const u32 height)
+        : m_Width{width}
+        , m_Height{height}
+    {
+    }
+
+    Size2D(const vk::Extent2D extent)
+        : m_Width{extent.width}
+        , m_Height{extent.height}
+    {
+    }
+
+    Size2D &
+    operator=(const vk::Extent2D other)
+    {
+        m_Height = other.height;
+        m_Width = other.width;
+        return *this;
+    }
 
-    explicit
     operator vk::Extent2D() const
     {
         return {m_Width, m_Height};

aster/include/aster/systems/device.h

@@ -437,10 +437,11 @@ struct Frame
     // Transient
     vk::Image m_SwapchainImage;
     vk::ImageView m_SwapchainImageView;
+    Size2D m_SwapchainSize;
     u32 m_ImageIdx;
     u32 m_CommandBuffersAllocated;
 
-    void Reset(u32 imageIdx, vk::Image swapchainImage, vk::ImageView swapchainImageView);
+    void Reset(u32 imageIdx, vk::Image swapchainImage, vk::ImageView swapchainImageView, Size2D swapchainSize);
     GraphicsContext CreateGraphicsContext();
     void WaitUntilReady();
 };

aster/src/aster/systems/device.cpp

@@ -974,7 +974,8 @@ systems::Device::GetNextFrame()
 
     // Reset frame here.
     // In case swapchain was out of date, we will reset the frame next time.
-    currentFrame.Reset(imageIndex, m_Swapchain.m_Images[imageIndex], m_Swapchain.m_ImageViews[imageIndex]);
+    currentFrame.Reset(imageIndex, m_Swapchain.m_Images[imageIndex], m_Swapchain.m_ImageViews[imageIndex],
+                       m_Swapchain.m_Extent);
 
     return currentFrame;
 }
@@ -1027,7 +1028,7 @@ systems::Device::Present(Frame &frame)
 }
 
 void
-systems::Frame::Reset(u32 imageIdx, vk::Image swapchainImage, vk::ImageView swapchainImageView)
+systems::Frame::Reset(u32 imageIdx, vk::Image swapchainImage, vk::ImageView swapchainImageView, Size2D swapchainSize)
 {
     AbortIfFailedMV(m_Device->m_Device.resetFences(1, &m_FrameAvailableFence), "Fence {} reset failed.", m_FrameIdx);
 
@@ -1037,6 +1038,7 @@ systems::Frame::Reset(u32 imageIdx, vk::Image swapchainImage, vk::ImageView swap
     m_ImageIdx = imageIdx;
     m_SwapchainImage = swapchainImage;
     m_SwapchainImageView = swapchainImageView;
+    m_SwapchainSize = swapchainSize;
 }
 
 systems::GraphicsContext

samples/01_triangle/triangle.cpp

@@ -83,21 +83,8 @@ main(int, char **)
     auto vbo = device.CreateVertexBuffer(vertices.size() * sizeof vertices[0], "VBO");
     vbo->Write(0, vertices.size() * sizeof vertices[0], vertices.data());
 
-    Size2D swapchainSize = device.GetSwapchainSize();
-    // Persistent variables
-    vk::Viewport viewport = {
-        .x = 0,
-        .y = Cast<f32>(swapchainSize.m_Height),
-        .width = Cast<f32>(swapchainSize.m_Width),
-        .height = -Cast<f32>(swapchainSize.m_Height),
-        .minDepth = 0.0,
-        .maxDepth = 1.0,
-    };
 
-    vk::Rect2D scissor = {
-        .offset = {0, 0},
-        .extent = Cast<vk::Extent2D>(swapchainSize),
-    };
+    // Persistent variables
 
     vk::ImageSubresourceRange subresourceRange = {
         .aspectMask = vk::ImageAspectFlagBits::eColor,
@@ -142,6 +129,22 @@ main(int, char **)
     {
         systems::Frame &currentFrame = device.GetNextFrame();
 
+        Size2D swapchainSize = currentFrame.m_SwapchainSize;
+
+        vk::Viewport viewport = {
+            .x = 0,
+            .y = Cast<f32>(swapchainSize.m_Height),
+            .width = Cast<f32>(swapchainSize.m_Width),
+            .height = -Cast<f32>(swapchainSize.m_Height),
+            .minDepth = 0.0,
+            .maxDepth = 1.0,
+        };
+
+        vk::Rect2D scissor = {
+            .offset = {0, 0},
+            .extent = Cast<vk::Extent2D>(swapchainSize),
+        };
+
         auto context = currentFrame.CreateGraphicsContext();
 
         topOfThePipeBarrier.image = currentFrame.m_SwapchainImage;