diff --git a/example/common/VulkanAppFramework.h b/example/common/VulkanAppFramework.h
index d248bbe0..2dd2971f 100644
--- a/example/common/VulkanAppFramework.h
+++ b/example/common/VulkanAppFramework.h
@@ -54,7 +54,7 @@ protected:
 protected:
 
     GPUDevice *             device                      =nullptr;
-    RTSwapchain *           sc_render_target            =nullptr;
+    SwapchainRenderTarget *           sc_render_target            =nullptr;
 
 protected:
 
@@ -225,8 +225,10 @@ public:
     {   
         if(!ri)return(false);
 
-        return BuildCommandBuffer(sc_render_target->GetRenderCmdBuffer(index),
-                                  sc_render_target->GetFramebuffer(index),
+        IRenderTarget *rt=sc_render_target->GetCurrentFrameRenderTarget();
+
+        return BuildCommandBuffer(rt->GetRenderCmdBuffer(),
+                                  rt->GetFramebuffer(),
                                   ri);
     }
 
@@ -234,7 +236,7 @@ public:
     {
         if(!ri)return(false);
 
-        for(uint32_t i=0;i<sc_render_target->GetImageCount();i++)
+        for(uint32_t i=0;i<sc_render_target->GetFrameCount();i++)
             BuildCommandBuffer(i,ri);
 
         return(true);
@@ -264,7 +266,7 @@ public:
 
     void BuildCommandBuffer(RenderList *rl)
     {
-        for(uint32_t i=0;i<sc_render_target->GetImageCount();i++)
+        for(uint32_t i=0;i<sc_render_target->GetFrameCount();i++)
             BuildCommandBuffer(i,rl);
     }
 
@@ -298,11 +300,9 @@ public:
         return sc_render_target->AcquireNextImage();
     }
 
-    virtual void SubmitDraw(int index)
+    virtual void SubmitDraw()
     {
-        VkCommandBuffer cb=*(sc_render_target->GetRenderCmdBuffer(index));
-
-        sc_render_target->Submit(cb);
+        sc_render_target->Submit();
         sc_render_target->PresentBackbuffer();
         sc_render_target->WaitQueue();
         sc_render_target->WaitFence();
@@ -312,9 +312,9 @@ public:
     {
         int index=AcquireNextImage();
 
-        if(index<0||index>=sc_render_target->GetImageCount())return;
+        if(index<0||index>=sc_render_target->GetFrameCount())return;
 
-        SubmitDraw(index);
+        SubmitDraw();
     }
 
     bool Run()
@@ -545,7 +545,7 @@ public:
 
         BuildCommandBuffer(index);
 
-        SubmitDraw(index);
+        SubmitDraw();
 
         ckc->Update();
         cmc->Update();
diff --git a/inc/hgl/graph/VK.h b/inc/hgl/graph/VK.h
index 469297a7..ffb8ff1d 100644
--- a/inc/hgl/graph/VK.h
+++ b/inc/hgl/graph/VK.h
@@ -37,7 +37,7 @@ class ImageView;
 class Framebuffer;
 struct Swapchain;
 class RenderTarget;
-class RTSwapchain;
+class SwapchainRenderTarget;
 
 class Texture;
 class Texture1D;
diff --git a/inc/hgl/graph/VKDevice.h b/inc/hgl/graph/VKDevice.h
index 278e929d..17ebc139 100644
--- a/inc/hgl/graph/VKDevice.h
+++ b/inc/hgl/graph/VKDevice.h
@@ -39,9 +39,9 @@ private:
 
     DeviceRenderPassManage *render_pass_manage;
 
-    RTSwapchain *sc_rt;
+    SwapchainRenderTarget *sc_rt;
 
-    RTSwapchain *CreateSwapchainRenderTarget();
+    SwapchainRenderTarget *CreateSwapchainRenderTarget();
 
     void InitRenderPassManage();
     void ClearRenderPassManage();
@@ -80,7 +80,7 @@ public:
 
                 RenderPass *        GetRenderPass       ()      {return sc_rt->GetRenderPass();}
 
-                RTSwapchain *       GetSwapchainRT      ()      {return sc_rt;}
+                SwapchainRenderTarget *       GetSwapchainRT      ()      {return sc_rt;}
 
     const       VkExtent2D &        GetSwapchainSize    ()const {return sc_rt->GetExtent();}
 
diff --git a/inc/hgl/graph/VKRenderTarget.h b/inc/hgl/graph/VKRenderTarget.h
index c11295a4..42201310 100644
--- a/inc/hgl/graph/VKRenderTarget.h
+++ b/inc/hgl/graph/VKRenderTarget.h
@@ -1,5 +1,4 @@
-#ifndef HGL_GRAPH_VULKAN_RENDER_TARGET_INCLUDE
-#define HGL_GRAPH_VULKAN_RENDER_TARGET_INCLUDE
+#pragma once
 
 #include<hgl/graph/VK.h>
 #include<hgl/graph/VKRenderPass.h>
@@ -7,61 +6,216 @@
 #include<hgl/graph/VKSwapchain.h>
 #include<hgl/graph/VKQueue.h>
 #include<hgl/graph/VKPipeline.h>
+
 VK_NAMESPACE_BEGIN
 /**
- * 渲染目标
- */
-class RenderTarget
+* RenderTarget 存在几种情况：
+* 
+* 1.正常单帧渲染目标，即只有一帧的数据，每次渲染都是当前帧
+* 
+* 2.多帧渲染目标，即有多帧数据，每次渲染都是指定帧，典型的是Swapchain
+* 
+* 所以RenderTarget的其实是一个多态类，根据不同的情况，有不同的实现
+*/
+
+class IRenderTarget
 {
-protected:
-
-    DeviceQueue *queue;
-
-    Framebuffer *fbo;
-    
     VkExtent2D extent;
     
-    Semaphore *render_complete_semaphore =nullptr;
+public:
 
-protected:
+    const   VkExtent2D &GetExtent       ()const{return extent;}
 
-    uint32_t color_count;               ///<颜色成分数量
-    Texture2D **color_textures;         ///<颜色成分纹理列表
-    Texture2D *depth_texture;           ///<深度成分纹理
+    virtual uint32_t    GetColorCount   ()=0;
+    virtual bool        hasDepth        ()=0;
+
+public:
+
+    IRenderTarget(const VkExtent2D &ext){extent=ext;}
+    virtual ~IRenderTarget()=default;
+    
+    virtual Framebuffer *       GetFramebuffer  ()=0;
+    virtual RenderPass *        GetRenderPass   ()=0;
+
+    virtual Texture2D *         GetColorTexture (const int index=0)=0;
+    virtual Texture2D *         GetDepthTexture ()=0;
+
+public: // Command Buffer
+
+    virtual DeviceQueue *       GetQueue            ()=0;
+    virtual Semaphore *         GetRenderCompleteSemaphore()=0;
+
+    virtual RenderCmdBuffer *   GetRenderCmdBuffer  ()=0;
+
+    virtual bool                Submit              (Semaphore *wait_sem)=0;
+
+    virtual bool                Submit              (){return Submit(nullptr);}
+
+    virtual bool                WaitQueue           ()=0;
+    virtual bool                WaitFence           ()=0;
+};//class IRenderTarget
+
+struct RenderTargetData
+{
+    Framebuffer *       fbo;
+    DeviceQueue *       queue;
+    Semaphore *         render_complete_semaphore;
+
+    RenderCmdBuffer *   cmd_buf;
+
+    uint32_t            color_count;            ///<颜色成分数量
+    Texture2D **        color_textures;         ///<颜色成分纹理列表
+    Texture2D *         depth_texture;          ///<深度成分纹理
+
+public:
+
+    Texture2D *GetColorTexture(const uint32_t index)
+    {
+        if(index>=color_count)
+            return(nullptr);
+
+        return color_textures[index];
+    }
+
+    virtual void Clear();
+};//struct RenderTargetData
+
+/**
+ * 单帧渲染目标
+ */
+class RenderTarget:public IRenderTarget
+{
+    RenderTargetData *data;
 
 protected:
 
     friend class GPUDevice;
 
-    RenderTarget(DeviceQueue *,Semaphore *);
-    RenderTarget(DeviceQueue *,Semaphore *,Framebuffer *_fb,Texture2D **color_texture_list,const uint32_t color_count,Texture2D *depth_texture);
+    RenderTarget(RenderTargetData *rtd):IRenderTarget(rtd->fbo->GetExtent())
+    {
+        data=rtd;
+    }
 
 public:
 
-    virtual ~RenderTarget();
+    virtual ~RenderTarget()
+    {
+        if(data)
+        {
+            data->Clear();
+            delete data;
+        }
+    }
+
+    Framebuffer *       GetFramebuffer      ()override{return data->fbo;}
+    RenderPass *        GetRenderPass       ()override{return data->fbo->GetRenderPass();}
+
+    uint32_t            GetColorCount       ()override{return data->color_count;}
     
-                    DeviceQueue *   GetQueue            ()      {return queue;}
-            const   VkExtent2D &    GetExtent           ()const {return extent;}
-    virtual         RenderPass *    GetRenderPass       ()      {return GetFramebuffer()->GetRenderPass();}
-    virtual         uint32_t        GetColorCount       ()      {return GetFramebuffer()->GetColorCount();}
+    bool                hasDepth            ()override{return data->depth_texture;}
 
-    virtual         Framebuffer *   GetFramebuffer      ()      {return fbo;}
-    virtual         Texture2D *     GetColorTexture     (const int index=0){return color_textures[index];}
-    virtual         Texture2D *     GetDepthTexture     ()      {return depth_texture;}
+    Texture2D *         GetColorTexture     (const int index=0) override{return data->GetColorTexture(index);}
+    Texture2D *         GetDepthTexture     ()                  override{return data->depth_texture;}
 
-public: // command buffer
+public: // Command Buffer
 
-            Semaphore *     GetRenderCompleteSemaphore  (){return render_complete_semaphore;}
-    virtual bool            Submit                      (RenderCmdBuffer *,Semaphore *present_complete_semaphore=nullptr);
+    DeviceQueue *       GetQueue            ()override{return data->queue;}
+    Semaphore *         GetRenderCompleteSemaphore()override{return data->render_complete_semaphore;}
 
-            bool            WaitQueue(){return queue->WaitQueue();}
-            bool            WaitFence(){return queue->WaitFence();}
+    RenderCmdBuffer *   GetRenderCmdBuffer  ()override{return data->cmd_buf;}
+
+    virtual bool        Submit              (Semaphore *wait_sem)override
+    {
+        if(!data)
+            return(false);
+
+        return data->queue->Submit(*data->cmd_buf,wait_sem,data->render_complete_semaphore);
+    }
+
+    bool                WaitQueue           ()override{return data->queue->WaitQueue();}
+    bool                WaitFence           ()override{return data->queue->WaitFence();}
 };//class RenderTarget
 
+/**
+* 多帧渲染目标
+*/
+class MFRenderTarget:public IRenderTarget
+{
+protected:
+
+    uint32_t frame_number;
+    uint32_t current_frame;
+
+    RenderTarget **rt_list;
+
+protected:
+
+    friend class GPUDevice;
+
+    MFRenderTarget(const uint32_t fn,RenderTarget **rtl):IRenderTarget(rtl[0]->GetFramebuffer()->GetExtent())
+    {
+        frame_number=fn;
+        current_frame=0;
+
+        rt_list=rtl;
+    }
+
+public:
+
+    virtual ~MFRenderTarget()
+    {
+        SAFE_CLEAR_OBJECT_ARRAY_OBJECT(rt_list,frame_number);
+    }
+
+    virtual void        NextFrame()
+    {
+        ++current_frame;
+
+        if(current_frame>=frame_number)
+            current_frame=0;
+    }
+    
+    uint32_t            GetCurrentFrameIndices      ()const{return current_frame;}
+    uint32_t            GetFrameCount               ()const{return frame_number;}
+    RenderTarget *      GetCurrentFrameRenderTarget (){return rt_list[current_frame];}
+
+public:
+
+    Framebuffer *       GetFramebuffer      ()override{return rt_list[current_frame]->GetFramebuffer();}
+    RenderPass *        GetRenderPass       ()override{return rt_list[current_frame]->GetRenderPass();}
+
+    uint32_t            GetColorCount       ()override{return rt_list[current_frame]->GetColorCount();}
+
+    Texture2D *         GetColorTexture     (const int index=0) override{return rt_list[current_frame]->GetColorTexture(index);}
+    Texture2D *         GetDepthTexture     ()                  override{return rt_list[current_frame]->GetDepthTexture();}
+
+    
+    bool                hasDepth            ()override{return rt_list[current_frame]->hasDepth();}
+
+public: // Command Buffer
+
+    DeviceQueue *       GetQueue            ()override{return rt_list[current_frame]->GetQueue();}
+    Semaphore *         GetRenderCompleteSemaphore()override{return rt_list[current_frame]->GetRenderCompleteSemaphore();}
+    RenderCmdBuffer *   GetRenderCmdBuffer  ()override{return rt_list[current_frame]->GetRenderCmdBuffer();}
+    
+    Framebuffer *       GetFramebuffer      (const uint32_t index){return rt_list[index]->GetFramebuffer();}
+    RenderCmdBuffer *   GetRenderCmdBuffer  (const uint32_t index){return rt_list[index]->GetRenderCmdBuffer();}
+
+    virtual bool        Submit              ()override{return rt_list[current_frame]->Submit(nullptr);}
+    
+    virtual bool        Submit              (Semaphore *wait_sem) override
+    {
+        return rt_list[current_frame]->Submit(wait_sem);
+    }
+
+    bool                WaitQueue           ()override{return rt_list[current_frame]->WaitQueue();}
+    bool                WaitFence           ()override{return rt_list[current_frame]->WaitFence();}
+};//class MFRenderTarget
+
 /**
  * 交换链专用渲染目标
  */
-class RTSwapchain:public RenderTarget
+class SwapchainRenderTarget:public MFRenderTarget
 {
     VkDevice device;
     Swapchain *swapchain;
@@ -69,47 +223,25 @@ class RTSwapchain:public RenderTarget
 
     Semaphore *present_complete_semaphore=nullptr;
 
-    uint32_t current_frame;
+private:
+
+    SwapchainRenderTarget(VkDevice dev,Swapchain *sc,Semaphore *pcs,RenderTarget **rtl);
+
+    friend class GPUDevice;
 
 public:
 
-    RTSwapchain(VkDevice dev,Swapchain *sc,DeviceQueue *q,Semaphore *rcs,Semaphore *pcs);
-    ~RTSwapchain();
-    
-            uint32_t            GetColorCount           ()      override            {return 1;}
-            uint32_t            GetImageCount           ()const                     {return swapchain->image_count;}
-            uint32_t            GetCurrentFrameIndices  ()const                     {return current_frame;}
-
-            Framebuffer *       GetFramebuffer          ()override                  {return swapchain->sc_image[current_frame].fbo;}
-            Framebuffer *       GetFramebuffer          (int index)                 {return swapchain->sc_image[index].fbo;}
-           
-    virtual Texture2D *         GetColorTexture         (const int index=0) override{return swapchain->sc_image[current_frame].color;}
-    virtual Texture2D *         GetDepthTexture         ()                  override{return swapchain->sc_image[current_frame].depth;}
-
-            RenderCmdBuffer *   GetRenderCmdBuffer      (int index)                 {return swapchain->sc_image[index].cmd_buf;}
+    ~SwapchainRenderTarget();
 
 public:
 
-            Semaphore *         GetPresentSemaphore     ()                          {return present_complete_semaphore;}
+    int     AcquireNextImage();             ///<获取下一帧的索引
 
-public:
+    bool    PresentBackbuffer();            ///<推送后台画面到前台
 
-    /**
-     * 请求下一帧画面的索引
-     * @param present_complete_semaphore 推送完成信号
-     */
-    int AcquireNextImage();
-
-    /**
-     * 推送后台画面到前台
-     * @param render_complete_semaphore 渲染完成信号
-     */
-    bool PresentBackbuffer(VkSemaphore *wait_semaphores,const uint32_t wait_semaphore_count);
-
-    bool PresentBackbuffer();
-
-    bool Submit(VkCommandBuffer);
-    bool Submit(VkCommandBuffer,Semaphore *);
+    bool    Submit()override
+    {
+        return rt_list[current_frame]->Submit(present_complete_semaphore);
+    }
 };//class RTSwapchain:public RenderTarget
 VK_NAMESPACE_END
-#endif//HGL_GRAPH_VULKAN_RENDER_TARGET_INCLUDE
diff --git a/src/SceneGraph/Vulkan/VKDeviceRenderTarget.cpp b/src/SceneGraph/Vulkan/VKDeviceRenderTarget.cpp
index e988b1e2..85246aa2 100644
--- a/src/SceneGraph/Vulkan/VKDeviceRenderTarget.cpp
+++ b/src/SceneGraph/Vulkan/VKDeviceRenderTarget.cpp
@@ -1,5 +1,6 @@
 #include<hgl/graph/VKDevice.h>
 #include<hgl/graph/VKDeviceRenderPassManage.h>
+#include<hgl/graph/VKSemaphore.h>
 
 VK_NAMESPACE_BEGIN
 RenderTarget *GPUDevice::CreateRT(const FramebufferInfo *fbi,RenderPass *rp,const uint32_t fence_count)
@@ -34,13 +35,21 @@ RenderTarget *GPUDevice::CreateRT(const FramebufferInfo *fbi,RenderPass *rp,cons
 
     if(fb)
     {
-        DeviceQueue *q=CreateQueue(fence_count,false);
-        Semaphore *render_complete_semaphore=CreateGPUSemaphore();
+        RenderTargetData *rtd=new RenderTargetData{};
 
-        RenderTarget *rt=new RenderTarget(q,render_complete_semaphore,fb,color_texture_list,color_count,depth_texture);
+        rtd->fbo                        =fb;
+        rtd->queue                      =CreateQueue(fence_count,false);
+        rtd->render_complete_semaphore  =CreateGPUSemaphore();
+
+        rtd->cmd_buf                    =CreateRenderCommandBuffer("");
+
+        rtd->color_count                =color_count;
+        rtd->color_textures             =hgl_new_copy<Texture2D *>(color_texture_list,color_count);
+        rtd->depth_texture              =depth_texture;
 
         color_texture_list.DiscardObject();
-        return rt;
+
+        return(new RenderTarget(rtd));
     }
 
     SAFE_CLEAR(depth_texture);
@@ -58,23 +67,56 @@ RenderTarget *GPUDevice::CreateRT(const FramebufferInfo *fbi,const uint32_t fenc
     return CreateRT(fbi,rp,fence_count);
 }
 
-RTSwapchain *GPUDevice::CreateSwapchainRenderTarget()
+namespace
+{
+    struct SwapchainRenderTargetData:public RenderTargetData
+    {
+        void Clear() override
+        {
+            delete render_complete_semaphore;
+            delete queue;
+
+            delete[] color_textures;
+        }
+    };//
+}//namespace
+
+SwapchainRenderTarget *GPUDevice::CreateSwapchainRenderTarget()
 {
     Swapchain *sc=CreateSwapchain(attr->surface_caps.currentExtent);
 
     if(!sc)
         return(nullptr);
 
-    DeviceQueue *q=CreateQueue(sc->image_count,false);
-    Semaphore *render_complete_semaphore=CreateGPUSemaphore();
-    Semaphore *present_complete_semaphore=CreateGPUSemaphore();
+    RenderTarget **rt_list=new RenderTarget*[sc->image_count];
 
-    RTSwapchain *srt=new RTSwapchain(   attr->device,
-                                        sc,
-                                        q,
-                                        render_complete_semaphore,
-                                        present_complete_semaphore
-                                        );
+    SwapchainImage *sc_image=sc->sc_image;
+
+    for(uint32_t i=0;i<sc->image_count;i++)
+    {
+        RenderTargetData *rtd=new SwapchainRenderTargetData{};
+
+        rtd->fbo                        =sc_image->fbo;
+        rtd->queue                      =CreateQueue(sc->image_count,false);
+        rtd->render_complete_semaphore  =CreateGPUSemaphore();
+
+        rtd->cmd_buf                    =sc_image->cmd_buf;
+
+        rtd->color_count                =1;
+        rtd->color_textures             =new Texture2D*[1];
+        rtd->color_textures[0]          =sc_image->color;
+        rtd->depth_texture              =sc_image->depth;
+
+        rt_list[i]=new RenderTarget(rtd);
+
+        ++sc_image;
+    }
+
+    SwapchainRenderTarget *srt=new SwapchainRenderTarget(   attr->device,
+                                                            sc,
+                                                            CreateGPUSemaphore(),
+                                                            rt_list
+                                                            );
 
     return srt;
 }
diff --git a/src/SceneGraph/Vulkan/VKDeviceSwapchain.cpp b/src/SceneGraph/Vulkan/VKDeviceSwapchain.cpp
index 43c6aee6..895cf90c 100644
--- a/src/SceneGraph/Vulkan/VKDeviceSwapchain.cpp
+++ b/src/SceneGraph/Vulkan/VKDeviceSwapchain.cpp
@@ -97,7 +97,6 @@ bool GPUDevice::CreateSwapchainFBO(Swapchain *swapchain)
 
     AnsiString num_string;
 
-
     for(uint32_t i=0;i<swapchain->image_count;i++)
     {
         swapchain->sc_image[i].color=CreateTexture2D(new SwapchainColorTextureCreateInfo(swapchain->surface_format.format,swapchain->extent,sc_images[i]));
@@ -105,7 +104,7 @@ bool GPUDevice::CreateSwapchainFBO(Swapchain *swapchain)
         if(!swapchain->sc_image[i].color)
             return(false);
 
-        swapchain->sc_image[i].depth =CreateTexture2D(new SwapchainDepthTextureCreateInfo(swapchain->depth_format,swapchain->extent));
+        swapchain->sc_image[i].depth=CreateTexture2D(new SwapchainDepthTextureCreateInfo(swapchain->depth_format,swapchain->extent));
 
         if(!swapchain->sc_image[i].depth)
             return(false);
diff --git a/src/SceneGraph/Vulkan/VKRenderTarget.cpp b/src/SceneGraph/Vulkan/VKRenderTarget.cpp
index 75372d83..d01dc60a 100644
--- a/src/SceneGraph/Vulkan/VKRenderTarget.cpp
+++ b/src/SceneGraph/Vulkan/VKRenderTarget.cpp
@@ -1,64 +1,17 @@
 #include<hgl/graph/VKRenderTarget.h>
 #include<hgl/graph/VKDevice.h>
-#include<hgl/graph/VKSwapchain.h>
-#include<hgl/graph/VKCommandBuffer.h>
 #include<hgl/graph/VKSemaphore.h>
 #include<hgl/graph/VKFramebuffer.h>
 
 VK_NAMESPACE_BEGIN
-RenderTarget::RenderTarget(DeviceQueue *q,Semaphore *s)
-{
-    queue=q;
-    fbo=nullptr;
 
-    color_count=0;
-    color_textures=nullptr;
-    depth_texture=nullptr;
-    render_complete_semaphore=s;
-}
-
-RenderTarget::RenderTarget(DeviceQueue *q,Semaphore *s,Framebuffer *_fb,Texture2D **ctl,const uint32_t cc,Texture2D *dt)
-{
-    queue=q;
-    fbo=_fb;
-    
-    depth_texture=dt;
-
-    color_count=cc;
-    if(color_count>0)
-    {
-        color_textures=new Texture2D *[color_count];
-        hgl_cpy(color_textures,ctl,color_count);
-
-        extent.width=color_textures[0]->GetWidth();
-        extent.height=color_textures[0]->GetHeight();
-    }
-    else
-    {
-        color_textures=nullptr;
-
-        if(depth_texture)
-        {
-            extent.width=depth_texture->GetWidth();
-            extent.height=depth_texture->GetHeight();
-        }
-    }
-
-    render_complete_semaphore=s;
-}
-
-RenderTarget::~RenderTarget()
+void RenderTargetData::Clear()
 {
     SAFE_CLEAR(queue);
-    SAFE_CLEAR(depth_texture);
-    SAFE_CLEAR_OBJECT_ARRAY_OBJECT(color_textures,color_count);
-    
     SAFE_CLEAR(render_complete_semaphore);
     SAFE_CLEAR(fbo);
+    SAFE_CLEAR_OBJECT_ARRAY_OBJECT(color_textures,color_count);
+    SAFE_CLEAR(depth_texture);
 }
 
-bool RenderTarget::Submit(RenderCmdBuffer *command_buffer,Semaphore *present_complete_semaphore)
-{
-    return queue->Submit(*command_buffer,present_complete_semaphore,render_complete_semaphore);
-}
 VK_NAMESPACE_END
\ No newline at end of file
diff --git a/src/SceneGraph/Vulkan/VKSwapchainRenderTarget.cpp b/src/SceneGraph/Vulkan/VKSwapchainRenderTarget.cpp
index cdb194b5..70a47e86 100644
--- a/src/SceneGraph/Vulkan/VKSwapchainRenderTarget.cpp
+++ b/src/SceneGraph/Vulkan/VKSwapchainRenderTarget.cpp
@@ -3,7 +3,7 @@
 #include<hgl/graph/VKSemaphore.h>
 
 VK_NAMESPACE_BEGIN
-RTSwapchain::RTSwapchain(VkDevice dev,Swapchain *sc,DeviceQueue *q,Semaphore *rcs,Semaphore *pcs):RenderTarget(q,rcs)
+SwapchainRenderTarget::SwapchainRenderTarget(VkDevice dev,Swapchain *sc,Semaphore *pcs,RenderTarget **rtl):MFRenderTarget(sc->image_count,rtl)
 {
     device=dev;
 
@@ -15,31 +15,36 @@ RTSwapchain::RTSwapchain(VkDevice dev,Swapchain *sc,DeviceQueue *q,Semaphore *rc
     present_info.pResults           = nullptr;
     present_info.pSwapchains        = &(swapchain->swap_chain);
    
-    extent=swapchain->extent;
-
-    current_frame=0;
-
     present_complete_semaphore=pcs;
 }
 
-RTSwapchain::~RTSwapchain()
+SwapchainRenderTarget::~SwapchainRenderTarget()
 {
     delete present_complete_semaphore;
     delete swapchain;
 }
     
-int RTSwapchain::AcquireNextImage()
+int SwapchainRenderTarget::AcquireNextImage()
 {
-    if(vkAcquireNextImageKHR(device,swapchain->swap_chain,UINT64_MAX,*(this->present_complete_semaphore),VK_NULL_HANDLE,&current_frame)==VK_SUCCESS)
+    if(vkAcquireNextImageKHR(device,
+                             swapchain->swap_chain,
+                             UINT64_MAX,
+                             *present_complete_semaphore,
+                             VK_NULL_HANDLE,
+                             &current_frame)==VK_SUCCESS)
         return current_frame;
 
     return -1;
 }
 
-bool RTSwapchain::PresentBackbuffer(VkSemaphore *wait_semaphores,const uint32_t count)
+bool SwapchainRenderTarget::PresentBackbuffer()
 {
-    present_info.waitSemaphoreCount =count;
-    present_info.pWaitSemaphores    =wait_semaphores;
+    DeviceQueue *queue=GetQueue();
+
+    VkSemaphore wait_semaphores=*GetRenderCompleteSemaphore();
+
+    present_info.waitSemaphoreCount =1;
+    present_info.pWaitSemaphores    =&wait_semaphores;
     present_info.pImageIndices      =&current_frame;
 
     VkResult result=queue->Present(&present_info);
@@ -55,21 +60,4 @@ bool RTSwapchain::PresentBackbuffer(VkSemaphore *wait_semaphores,const uint32_t
 
     return(true);
 }
-
-bool RTSwapchain::PresentBackbuffer()
-{
-    VkSemaphore sem=*render_complete_semaphore;
-
-    return this->PresentBackbuffer(&sem,1);
-}
-    
-bool RTSwapchain::Submit(VkCommandBuffer cb)
-{
-    return queue->Submit(cb,present_complete_semaphore,render_complete_semaphore);
-}
-
-bool RTSwapchain::Submit(VkCommandBuffer cb,Semaphore *pce)
-{
-    return queue->Submit(cb,pce,render_complete_semaphore);
-}
 VK_NAMESPACE_END