VulkanAppFramework增加SetClearColor函数，并产生对应功能。

example/Vulkan/OffscreenRender.cpp

@@ -140,7 +140,7 @@ public:
         rect.material_instance=db->CreateMaterialInstance(OS_TEXT("res/material/Texture2D"));        
         if(!rect.material_instance)return(false);
 
-        rect.pipeline=CreatePipeline(rect.material_instance,vulkan::InlinePipeline::Solid2D);
+        rect.pipeline=CreatePipeline(rect.material_instance,vulkan::InlinePipeline::Alpha2D);
         if(!rect.pipeline)return(false);
 
         rect.sampler=db->CreateSampler();
@@ -170,6 +170,8 @@ public:
         if(!VulkanApplicationFramework::Init(SCREEN_WIDTH,SCREEN_HEIGHT))
             return(false);
 
+        SetClearColor(COLOR::MozillaCharcoal);
+
         if(!InitOffscreen())
             return(false);
 

example/common/VulkanAppFramework.h

@@ -55,6 +55,8 @@ protected:
 
     vulkan::CommandBuffer **        cmd_buf                     =nullptr;
 
+            Color4f                 clear_color;
+
 protected:
 
     vulkan::Database *              db                          =nullptr;
@@ -77,6 +79,8 @@ public:
     {
         hgl_zero(key_status);
 
+        clear_color.Zero();
+
     #ifdef _DEBUG
         if(!vulkan::CheckStrideBytesByFormat())
             return(false);
@@ -187,6 +191,11 @@ public:
         cb->End();
     }
 
+    void SetClearColor(COLOR cc)
+    {
+        clear_color.Use(cc,1.0);
+    }
+
     void BuildCommandBuffer(uint32_t index,vulkan::RenderableInstance *ri)
     {
         if(!ri)
@@ -196,6 +205,8 @@ public:
 
         vulkan::CommandBuffer *cb=cmd_buf[index];
 
+        cb->SetClearColor(0,clear_color.r,clear_color.g,clear_color.b);
+
         cb->Begin();
             cb->BindFramebuffer(sc_render_target->GetRenderPass(),sc_render_target->GetFramebuffer(index));
                 cb->BindPipeline(ri->GetPipeline());