FIX: position swapchain to RGBA32F(RT shadow quality in far dist), memory allocation errors

src/core/ibl_manager.cpp

@@ -255,15 +255,20 @@ void IBLManager::unload()
     if (_spec.image)
     {
         rm->destroy_image(_spec);
-        _spec = {};
     }
-    if (_diff.image && _diff.image != _spec.image) { rm->destroy_image(_diff); }
+    // Handle potential aliasing: _diff may have been set to _spec in load().
-    _diff = {};
+    if (_diff.image && _diff.image != _spec.image)
+    {
+        rm->destroy_image(_diff);
+    }
     if (_brdf.image)
     {
         rm->destroy_image(_brdf);
-        _brdf = {};
     }
+
+    _spec = {};
+    _diff = {};
+    _brdf = {};
     if (_iblSetLayout && _ctx && _ctx->getDevice())
     {
         vkDestroyDescriptorSetLayout(_ctx->getDevice()->device(), _iblSetLayout, nullptr);

src/core/vk_device.cpp

@@ -121,18 +121,30 @@ void DeviceManager::init_vulkan(SDL_Window *window)
 
 void DeviceManager::cleanup()
 {
-    // Optional VMA stats print
+    // Always query VMA stats once before destroying the allocator so we can
-    if (_allocator && vmaDebugEnabled())
+    // spot leaks that would trigger the vk_mem_alloc.h assertion:
+    // "Some allocations were not freed before destruction of this memory block!"
+    if (_allocator)
     {
         VmaTotalStatistics stats{};
         vmaCalculateStatistics(_allocator, &stats);
-        const VmaStatistics& s = stats.total.statistics;
+        const VmaStatistics &s = stats.total.statistics;
+
+        if (s.allocationCount != 0)
+        {
+            fmt::print("[VMA] WARNING: {} live allocations ({} bytes) remain before allocator destruction – this will trip vk_mem_alloc.h assertion: \"Some allocations were not freed before destruction of this memory block!\"\n",
+                       (size_t)s.allocationCount,
+                       (unsigned long long)s.allocationBytes);
+        }
+        else if (vmaDebugEnabled())
+        {
             fmt::print("[VMA] Blocks: {} | Allocations: {} | BlockBytes: {} | AllocationBytes: {}\n",
                        (size_t)s.blockCount,
                        (size_t)s.allocationCount,
                        (unsigned long long)s.blockBytes,
                        (unsigned long long)s.allocationBytes);
         }
+    }
     vkDestroySurfaceKHR(_instance, _surface, nullptr);
     _deletionQueue.flush();
     vkDestroyDevice(_device, nullptr);

src/core/vk_engine.cpp

@@ -420,6 +420,14 @@ void VulkanEngine::cleanup()
         print_vma_stats(_deviceManager.get(), "after AssetManager");
         dump_vma_json(_deviceManager.get(), "after_AssetManager");
 
+        // Release IBL GPU resources (spec/diffuse cubes + BRDF LUT)
+        if (_iblManager)
+        {
+            _iblManager->unload();
+        }
+        print_vma_stats(_deviceManager.get(), "after IBLManager");
+        dump_vma_json(_deviceManager.get(), "after_IBLManager");
+
         // Ensure ray tracing resources (BLAS/TLAS/instance buffers) are freed before VMA is destroyed
         if (_rayManager) { _rayManager->cleanup(); }
         print_vma_stats(_deviceManager.get(), "after RTManager");

src/core/vk_swapchain.cpp

@@ -64,7 +64,7 @@ void SwapchainManager::init_swapchain()
         VK_CHECK(vkCreateImageView(_deviceManager->device(), &dview_info, nullptr, &_depthImage.imageView));
 
         // GBuffer (SRGB not used to keep linear lighting)
-        _gBufferPosition = _resourceManager->create_image(drawImageExtent, VK_FORMAT_R16G16B16A16_SFLOAT,
+        _gBufferPosition = _resourceManager->create_image(drawImageExtent, VK_FORMAT_R32G32B32A32_SFLOAT,
                                                           VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT | VK_IMAGE_USAGE_SAMPLED_BIT);
         _gBufferNormal = _resourceManager->create_image(drawImageExtent, VK_FORMAT_R16G16B16A16_SFLOAT,
                                                         VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT | VK_IMAGE_USAGE_SAMPLED_BIT);

src/render/vk_renderpass_lighting.cpp

@@ -310,6 +310,20 @@ void LightingPass::draw_lighting(VkCommandBuffer cmd,
 
 void LightingPass::cleanup()
 {
+    if (_context && _context->getResources())
+    {
+        if (_fallbackIbl2D.image)
+        {
+            _context->getResources()->destroy_image(_fallbackIbl2D);
+            _fallbackIbl2D = {};
+        }
+        if (_fallbackBrdfLut2D.image)
+        {
+            _context->getResources()->destroy_image(_fallbackBrdfLut2D);
+            _fallbackBrdfLut2D = {};
+        }
+    }
+
     _deletionQueue.flush();
     fmt::print("LightingPass::cleanup()\n");
 }

src/scene/vk_scene.cpp

@@ -317,6 +317,16 @@ void SceneManager::cleanup()
     clearMeshInstances();
     clearGLTFInstances();
 
+    // On engine shutdown we know VulkanEngine::cleanup() has already called
+    // vkDeviceWaitIdle(), so it is safe to destroy all remaining GLTF scenes
+    // immediately instead of deferring them through pendingGLTFRelease.
+    if (!pendingGLTFRelease.empty())
+    {
+        fmt::println("[SceneManager] cleanup: forcing {} pending GLTF releases before shutdown",
+                     pendingGLTFRelease.size());
+        pendingGLTFRelease.clear(); // drop strong refs → ~LoadedGLTF::clearAll() runs
+    }
+
     // Drop our references to GLTF scenes. Their destructors call clearAll()
     // exactly once to release GPU resources.
     loadedScenes.clear();