Backends: Vulkan: fixed texture update corruption introduced in 1.92.0. (#8801, #8755, #8840, #8465)

Fix abe294bfd0bf

backends/imgui_impl_vulkan.cpp

@@ -27,6 +27,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2025-07-27: Vulkan: Fixed texture update corruption introduced on 2025-06-11. (#8801, #8755, #8840)
 //  2025-07-07: Vulkan: Fixed texture synchronization issue introduced on 2025-06-11. (#8772)
 //  2025-06-27: Vulkan: Fixed validation errors during texture upload/update by aligning upload size to 'nonCoherentAtomSize'. (#8743, #8744)
 //  2025-06-11: Vulkan: Added support for ImGuiBackendFlags_RendererHasTextures, for dynamic font atlas. Removed ImGui_ImplVulkan_CreateFontsTexture() and ImGui_ImplVulkan_DestroyFontsTexture().
@@ -818,7 +819,7 @@ void ImGui_ImplVulkan_UpdateTexture(ImTextureData* tex)
             VkImageMemoryBarrier copy_barrier[1] = {};
             copy_barrier[0].sType = VK_STRUCTURE_TYPE_IMAGE_MEMORY_BARRIER;
             copy_barrier[0].dstAccessMask = VK_ACCESS_TRANSFER_WRITE_BIT;
-            copy_barrier[0].oldLayout = VK_IMAGE_LAYOUT_UNDEFINED;
+            copy_barrier[0].oldLayout = (tex->Status == ImTextureStatus_WantCreate) ? VK_IMAGE_LAYOUT_UNDEFINED : VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
             copy_barrier[0].newLayout = VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL;
             copy_barrier[0].srcQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED;
             copy_barrier[0].dstQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED;

docs/CHANGELOG.txt

@@ -59,6 +59,8 @@ Other Changes:
   to facilitate multiple init/shutdown cycles in same process. (#8792) [@tim-rex]
 - Backends: OpenGL2, OpenGL3: set GL_UNPACK_ALIGNMENT to 1 before updating 
   textures. (#8802) [@Daandelange]
+- Backends: Vulkan: Fixed texture update corruption introduced in 1.92.0,
+  affecting some drivers/setups. (#8801, #8755, #8840) [@Retro52, @Miolith]
 
 
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