Allow writing to planar YUV textures from application code in the Vulkan renderer

src/render/vulkan/SDL_render_vulkan.c

@@ -832,9 +832,10 @@ static VkResult VULKAN_AllocateImage(VULKAN_RenderData *rendererData, SDL_Proper
         imageCreateInfo.queueFamilyIndexCount = 0;
         imageCreateInfo.initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
 
-        // Set VK_IMAGE_CREATE_MUTABLE_FORMAT_BIT for planar formats
+        // Allow writing to planar YUV textures from application code
         if (VULKAN_VkFormatGetNumPlanes(format) > 1) {
-            imageCreateInfo.flags |= VK_IMAGE_CREATE_MUTABLE_FORMAT_BIT;
+            imageCreateInfo.flags |= (VK_IMAGE_CREATE_MUTABLE_FORMAT_BIT | VK_IMAGE_CREATE_EXTENDED_USAGE_BIT);
+            imageCreateInfo.usage |= VK_IMAGE_USAGE_STORAGE_BIT;
         }
 
         result = vkCreateImage(rendererData->device, &imageCreateInfo, NULL, &imageOut->image);
@@ -1769,6 +1770,7 @@ static VkResult VULKAN_CreateDeviceResources(SDL_Renderer *renderer, SDL_Propert
        */
         VK_KHR_SAMPLER_YCBCR_CONVERSION_EXTENSION_NAME,
         VK_KHR_MAINTENANCE1_EXTENSION_NAME,
+        VK_KHR_MAINTENANCE2_EXTENSION_NAME,
         VK_KHR_BIND_MEMORY_2_EXTENSION_NAME,
         VK_KHR_GET_MEMORY_REQUIREMENTS_2_EXTENSION_NAME,
     };
@@ -1902,7 +1904,7 @@ static VkResult VULKAN_CreateDeviceResources(SDL_Renderer *renderer, SDL_Propert
         deviceCreateInfo.queueCreateInfoCount = 0;
         deviceCreateInfo.pQueueCreateInfos = deviceQueueCreateInfo;
         deviceCreateInfo.pEnabledFeatures = NULL;
-        deviceCreateInfo.enabledExtensionCount = (rendererData->supportsKHRSamplerYCbCrConversion) ? 5 : 1;
+        deviceCreateInfo.enabledExtensionCount = (rendererData->supportsKHRSamplerYCbCrConversion) ? SDL_arraysize(deviceExtensionNames) : 1;
         deviceCreateInfo.ppEnabledExtensionNames = deviceExtensionNames;
 
         deviceQueueCreateInfo[0].sType = VK_STRUCTURE_TYPE_DEVICE_QUEUE_CREATE_INFO;