Remove superfluous transition from multisampling chapter

Overv · Overv · commit 43221c86a021 · 2019-11-03T13:42:10.000+01:00
diff --git a/code/29_multisampling.cpp b/code/29_multisampling.cpp
@@ -817,8 +817,6 @@ class HelloTriangleApplication {
 
         createImage(swapChainExtent.width, swapChainExtent.height, 1, msaaSamples, colorFormat, VK_IMAGE_TILING_OPTIMAL, VK_IMAGE_USAGE_TRANSIENT_ATTACHMENT_BIT | VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT, colorImage, colorImageMemory);
         colorImageView = createImageView(colorImage, colorFormat, VK_IMAGE_ASPECT_COLOR_BIT, 1);
-
-        transitionImageLayout(colorImage, colorFormat, VK_IMAGE_LAYOUT_UNDEFINED, VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL, 1);
     }
 
     void createDepthResources() {
@@ -1104,13 +1102,7 @@ VkSampleCountFlagBits getMaxUsableSampleCount() {
 
             sourceStage = VK_PIPELINE_STAGE_TRANSFER_BIT;
             destinationStage = VK_PIPELINE_STAGE_FRAGMENT_SHADER_BIT;
-        } else if (oldLayout == VK_IMAGE_LAYOUT_UNDEFINED && newLayout == VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL) {
-            barrier.srcAccessMask = 0;
-            barrier.dstAccessMask = VK_ACCESS_COLOR_ATTACHMENT_READ_BIT | VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT;
-            sourceStage = VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT;
-            destinationStage = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
-        }
-        else {
+        } else {
             throw std::invalid_argument("unsupported layout transition!");
         }
 
diff --git a/en/10_Multisampling.md b/en/10_Multisampling.md
@@ -99,8 +99,6 @@ void createColorResources() {
 
     createImage(swapChainExtent.width, swapChainExtent.height, 1, msaaSamples, colorFormat, VK_IMAGE_TILING_OPTIMAL, VK_IMAGE_USAGE_TRANSIENT_ATTACHMENT_BIT | VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT, colorImage, colorImageMemory);
     colorImageView = createImageView(colorImage, colorFormat, VK_IMAGE_ASPECT_COLOR_BIT, 1);
-
-    transitionImageLayout(colorImage, colorFormat, VK_IMAGE_LAYOUT_UNDEFINED, VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL, 1);
 }
 ```
 
@@ -115,24 +113,6 @@ void initVulkan() {
 }
 ```
 
-You may notice that the newly created color image uses a transition path from `VK_IMAGE_LAYOUT_UNDEFINED` to `VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL` which is a new case for us to handle. Let's update `transitionImageLayout` function to take this into account:
-
-```c++
-void transitionImageLayout(VkImage image, VkFormat format, VkImageLayout oldLayout, VkImageLayout newLayout, uint32_t mipLevels) {
-    ...
-    else if (oldLayout == VK_IMAGE_LAYOUT_UNDEFINED && newLayout == VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL) {
-        barrier.srcAccessMask = 0;
-        barrier.dstAccessMask = VK_ACCESS_COLOR_ATTACHMENT_READ_BIT | VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT;
-        sourceStage = VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT;
-        destinationStage = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
-    }
-    else {
-        throw std::invalid_argument("unsupported layout transition!");
-    }
-    ...
-}
-```
-
 Now that we have a multisampled color buffer in place it's time to take care of depth. Modify `createDepthResources` and update the number of samples used by the depth buffer:
 
 ```c++
