diff --git a/inc/hgl/graph/VKDeviceAttribute.h b/inc/hgl/graph/VKDeviceAttribute.h
index 669d7f65..275fab31 100644
--- a/inc/hgl/graph/VKDeviceAttribute.h
+++ b/inc/hgl/graph/VKDeviceAttribute.h
@@ -53,7 +53,7 @@ public:
     GPUDeviceAttribute(VulkanInstance *inst,const GPUPhysicalDevice *pd,VkSurfaceKHR s);
     ~GPUDeviceAttribute();
 
-    bool CheckMemoryType(uint32_t typeBits,VkMemoryPropertyFlags properties,uint32_t *typeIndex) const;
+    int GetMemoryType(uint32_t typeBits,VkMemoryPropertyFlags properties) const;
 
     void RefreshSurfaceCaps();
 
diff --git a/inc/hgl/graph/VKPhysicalDevice.h b/inc/hgl/graph/VKPhysicalDevice.h
index e75f1279..702c0caf 100644
--- a/inc/hgl/graph/VKPhysicalDevice.h
+++ b/inc/hgl/graph/VKPhysicalDevice.h
@@ -31,7 +31,7 @@ public:
     operator VkPhysicalDevice(){return physical_device;}
     operator const VkPhysicalDevice()const{return physical_device;}
 
-    const bool              CheckMemoryType(uint32_t,VkMemoryPropertyFlags,uint32_t *)const;
+    const int               GetMemoryType(uint32_t,VkMemoryPropertyFlags)const;
 
     VkPhysicalDeviceType    GetDeviceType()const{return properties.deviceType;}
     const char *            GetDeviceName()const{return properties.deviceName;}
diff --git a/src/SceneGraph/Vulkan/VKDeviceAttribute.cpp b/src/SceneGraph/Vulkan/VKDeviceAttribute.cpp
index 4860f633..45a27aeb 100644
--- a/src/SceneGraph/Vulkan/VKDeviceAttribute.cpp
+++ b/src/SceneGraph/Vulkan/VKDeviceAttribute.cpp
@@ -40,9 +40,9 @@ GPUDeviceAttribute::~GPUDeviceAttribute()
         instance->DestroySurface(surface);
 }
 
-bool GPUDeviceAttribute::CheckMemoryType(uint32_t typeBits,VkMemoryPropertyFlags properties,uint32_t *typeIndex) const
+int GPUDeviceAttribute::GetMemoryType(uint32_t typeBits,VkMemoryPropertyFlags properties) const
 {
-    return physical_device->CheckMemoryType(typeBits,properties,typeIndex);
+    return physical_device->GetMemoryType(typeBits,properties);
 }
 
 void GPUDeviceAttribute::RefreshSurfaceCaps()
diff --git a/src/SceneGraph/Vulkan/VKDeviceTexture.cpp b/src/SceneGraph/Vulkan/VKDeviceTexture.cpp
index 9dc61f1d..0a520c59 100644
--- a/src/SceneGraph/Vulkan/VKDeviceTexture.cpp
+++ b/src/SceneGraph/Vulkan/VKDeviceTexture.cpp
@@ -246,7 +246,7 @@ bool GPUDevice::CommitTexture2D(Texture2D *tex,GPUBuffer *buf,const VkBufferImag
         VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL,
         count,
         buffer_image_copy);
-    
+
     if(destinationStage==VK_PIPELINE_STAGE_TRANSFER_BIT)                            //接下来还有，一般是给自动生成mipmaps
     {
         texture_cmd_buf->ImageMemoryBarrier(tex->GetImage(),
diff --git a/src/SceneGraph/Vulkan/VKMemory.cpp b/src/SceneGraph/Vulkan/VKMemory.cpp
index cfe975f8..aedc7ca9 100644
--- a/src/SceneGraph/Vulkan/VKMemory.cpp
+++ b/src/SceneGraph/Vulkan/VKMemory.cpp
@@ -4,9 +4,9 @@
 VK_NAMESPACE_BEGIN
 GPUMemory *GPUDevice::CreateMemory(const VkMemoryRequirements &req,uint32_t properties)
 {
-    uint32_t index;
+    const int index=attr->physical_device->GetMemoryType(req.memoryTypeBits,properties);
 
-    if(!attr->physical_device->CheckMemoryType(req.memoryTypeBits,properties,&index))
+    if(index<0)
         return(nullptr);
 
     MemoryAllocateInfo alloc_info(index,req.size);
diff --git a/src/SceneGraph/Vulkan/VKPhysicalDevice.cpp b/src/SceneGraph/Vulkan/VKPhysicalDevice.cpp
index b30e867a..f2fda25b 100644
--- a/src/SceneGraph/Vulkan/VKPhysicalDevice.cpp
+++ b/src/SceneGraph/Vulkan/VKPhysicalDevice.cpp
@@ -193,24 +193,20 @@ const bool GPUPhysicalDevice::CheckExtensionSupport(const AnsiString &name)const
     return(false);
 }
 
-const bool GPUPhysicalDevice::CheckMemoryType(uint32_t typeBits,VkMemoryPropertyFlags properties,uint32_t *typeIndex)const
+const int GPUPhysicalDevice::GetMemoryType(uint32_t typeBits,VkMemoryPropertyFlags properties)const
 {
     // Search memtypes to find first index with those properties
-    for(uint32_t i=0; i<memory_properties.memoryTypeCount; i++)
+    for(int i=0; i<memory_properties.memoryTypeCount; i++)
     {
-        if((typeBits&1)==1)
-        {
-            // Type is available, does it match user properties?
+        if(typeBits&1)  // Type is available, does it match user properties?
             if((memory_properties.memoryTypes[i].propertyFlags&properties)==properties)
-            {
-                *typeIndex=i;
-                return true;
-            }
-        }
+                return i;
+
         typeBits>>=1;
     }
+
     // No memory types matched, return failure
-    return false;
+    return -1;
 }
 
 VkFormat GPUPhysicalDevice::GetDepthFormat(bool lower_to_high)const