[Fix] (MG_Util, DirectVulkan): tolerate storage-less attachments in component-size queries

GetComponentSizesForInternalFormat asserted on TextureInternalFormat::Unknown,
which framebuffer-parameter queries legitimately reach for attachments that
have no storage yet (KHR-GL33.packed_depth_stencil.validate_errors.initial_state
aborted there). Answer with all-zero sizes and keep a warning for genuinely
unhandled formats. Also include the image dimensions in the texture
vmaCreateImage failure report.

MobileGL/MG_Backend/DirectVulkan/Renderer/VkTextureManager.cpp

@@ -1694,7 +1694,10 @@ namespace MobileGL::MG_Backend::DirectVulkan {
         allocationInfo.usage = VMA_MEMORY_USAGE_AUTO_PREFER_DEVICE;
         allocationInfo.requiredFlags = VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT;
         VK_VERIFY(vmaCreateImage(m_allocator, &imageInfo, &allocationInfo, &resource.image, &resource.allocation, nullptr),
-                  "vmaCreateImage(texture)");
+                  "vmaCreateImage(texture) textureId=%d extent=%ux%u depth=%u layers=%u mips=%u samples=%d format=%d",
+                  texture.GetExternalIndex(), imageInfo.extent.width, imageInfo.extent.height,
+                  imageInfo.extent.depth, imageInfo.arrayLayers, imageInfo.mipLevels,
+                  static_cast<Int>(imageInfo.samples), static_cast<Int>(imageInfo.format));
         ++m_textureImageEpoch; // a new attachment image invalidates cached render passes
 
         resource.layout = VK_IMAGE_LAYOUT_UNDEFINED;

MobileGL/MG_Util/Metrics/TextureMetrics.cpp

@@ -503,9 +503,13 @@ namespace MobileGL {
                 s.Depth = 32;
                 s.Stencil = 8;
                 break;
+            case TextureInternalFormat::Unknown:
+                // Queried for attachments that have no storage yet (e.g. framebuffer
+                // parameter queries on the initial state); every size stays 0.
+                break;
             default:
-                MOBILEGL_ASSERT(false, "Unimplemented internal format in GetComponentSizesForInternalFormat: %d",
-                                static_cast<Int>(internal));
+                MGLOG_W("Unimplemented internal format in GetComponentSizesForInternalFormat: %d",
+                        static_cast<Int>(internal));
                 break;
             }