Better structure again (whoohoo)!

cve_renderer.cpp

@@ -25,10 +25,11 @@ namespace cve {
     if (cveSwapChain == nullptr) {
       cveSwapChain = std::make_unique<CveSwapChain>(cveDevice, extent);
     } else {
-      cveSwapChain = std::make_unique<CveSwapChain>(cveDevice, extent, std::move(cveSwapChain));
-      if (cveSwapChain->imageCount() != commandBuffers.size()) {
-        freeCommandBuffers();
-        createCommandBuffers();
+      std::shared_ptr<CveSwapChain> oldSwapChain = std::move(cveSwapChain);
+      cveSwapChain = std::make_unique<CveSwapChain>(cveDevice, extent, oldSwapChain);
+
+      if (!oldSwapChain->compareSwapFormats(*cveSwapChain.get())) {
+        throw std::runtime_error("Swap chain image format/depth has changed.");
       }
     }
 
@@ -36,7 +37,7 @@ namespace cve {
   }
 
   void CveRenderer::createCommandBuffers() {
-    commandBuffers.resize(cveSwapChain->imageCount());
+    commandBuffers.resize(CveSwapChain::MAX_FRAMES_IN_FLIGHT);
 
     VkCommandBufferAllocateInfo allocInfo{};
     allocInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO;
@@ -99,6 +100,8 @@ namespace cve {
     }
 
     isFrameStarted = false;
+
+    currentFrameIndex = (currentFrameIndex + 1) % CveSwapChain::MAX_FRAMES_IN_FLIGHT;
   }
 
   void CveRenderer::beginSwapChainRenderPass(VkCommandBuffer commandBuffer) {

cve_renderer.hpp

@@ -23,7 +23,12 @@ namespace cve {
 
       VkCommandBuffer getCurrentCommandBuffer() const {
         assert(isFrameStarted && "Cannot get command buffer when frame is not in progress");
-        return commandBuffers[currentImageIndex];
+        return commandBuffers[currentFrameIndex];
+      }
+
+      int getFrameIndex() const {
+        assert(isFrameStarted && "Cannot get frame index when frame is not started");
+        return currentFrameIndex;
       }
 
       VkCommandBuffer beginFrame();
@@ -41,7 +46,8 @@ namespace cve {
       std::unique_ptr<CveSwapChain> cveSwapChain;
       std::vector<VkCommandBuffer> commandBuffers;
 
-      uint32_t currentImageIndex;
+      uint32_t currentImageIndex = 0;
+      int currentFrameIndex = 0;
       bool isFrameStarted = false;
   };
 }

cve_swap_chain.cpp

@@ -301,6 +301,7 @@ void CveSwapChain::createFramebuffers() {
 
 void CveSwapChain::createDepthResources() {
   VkFormat depthFormat = findDepthFormat();
+  swapChainDepthFormat = depthFormat;
   VkExtent2D swapChainExtent = getSwapChainExtent();
 
   depthImages.resize(imageCount());

cve_swap_chain.hpp

@@ -40,6 +40,11 @@ class CveSwapChain {
   VkResult acquireNextImage(uint32_t *imageIndex);
   VkResult submitCommandBuffers(const VkCommandBuffer *buffers, uint32_t *imageIndex);
 
+  bool compareSwapFormats(const CveSwapChain& swapChain) const {
+    return swapChain.swapChainDepthFormat == swapChainDepthFormat && 
+    swapChain.swapChainImageFormat == swapChainImageFormat;
+  };
+
  private:
   void init();
   void createSwapChain();
@@ -57,6 +62,7 @@ class CveSwapChain {
   VkExtent2D chooseSwapExtent(const VkSurfaceCapabilitiesKHR &capabilities);
 
   VkFormat swapChainImageFormat;
+  VkFormat swapChainDepthFormat;
   VkExtent2D swapChainExtent;
 
   std::vector<VkFramebuffer> swapChainFramebuffers;