将cmd_buf,SceneDB转移到VulkanApplicationFramework中，以减少每个Example中的代码

example/Vulkan/Geometry2D.cpp

@@ -29,9 +29,6 @@ class TestApp:public VulkanApplicationFramework
 {
 private:
 
-    uint swap_chain_count=0;
-
-            SceneDB *           db                  =nullptr;
             SceneNode           render_root;
             RenderList          render_list;
 
@@ -45,16 +42,6 @@ private:
     vulkan::Buffer *            ubo_mvp             =nullptr;
 
     vulkan::Pipeline *          pipeline            =nullptr;
-    vulkan::CommandBuffer **    cmd_buf             =nullptr;
-
-public:
-
-    ~TestApp()
-    {
-        SAFE_CLEAR(db);
-
-        SAFE_CLEAR_OBJECT_ARRAY(cmd_buf,swap_chain_count);
-    }
 
 private:
 
@@ -152,27 +139,7 @@ private:
 
         render_root.ExpendToList(&render_list);
 
-        return(true);
-    }
-
-    bool InitCommandBuffer()
-    {
-        cmd_buf=hgl_zero_new<vulkan::CommandBuffer *>(swap_chain_count);
-
-        for(uint i=0;i<swap_chain_count;i++)
-        {
-            cmd_buf[i]=device->CreateCommandBuffer();
-
-            if(!cmd_buf[i])
-                return(false);
-
-            cmd_buf[i]->Begin();
-                cmd_buf[i]->BeginRenderPass(device->GetRenderPass(),device->GetFramebuffer(i));
-                    render_list.Render(cmd_buf[i]);
-                cmd_buf[i]->EndRenderPass();
-            cmd_buf[i]->End();
-        }
-
+        BuildCommandBuffer(&render_list);
         return(true);
     }
 
@@ -183,10 +150,6 @@ public:
         if(!VulkanApplicationFramework::Init(SCREEN_WIDTH,SCREEN_HEIGHT))
             return(false);
 
-        swap_chain_count=device->GetSwapChainImageCount();
-
-        db=new SceneDB(device);
-
         if(!InitMaterial())
             return(false);
 
@@ -201,20 +164,8 @@ public:
         if(!InitScene())
             return(false);
 
-        if(!InitCommandBuffer())
-            return(false);
-
         return(true);
     }
-
-    void Draw() override
-    {
-        const uint32_t frame_index=device->GetCurrentFrameIndices();
-
-        const vulkan::CommandBuffer *cb=cmd_buf[frame_index];
-
-        Submit(*cb);
-    }
 };//class TestApp:public VulkanApplicationFramework
 
 int main(int,char **)