DXUT窗口设置背景

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本文主要介绍如何在DXUT框架下设置Direct3D窗口的背景，通过C2DDraw类实现，包括创建Offscreen Plain Surface，加载图片并将其复制到后台缓冲区。

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DXUT窗口设置背景

作者：Kagula

日期：2009-3-31

阅读对象

[1]了解DXUT框架的基本使用

[2]能够读懂C源码

环境

[1]Visual Studio 2005

[2]DirectX SDK (November 2008)

内容概要

在DXUT框架下，设置当前窗口的背景。

正文

理论方面可以参考《Beginning.DirectX9》这本书，2D部份。

这里仅给出源码，C2DDraw.h、C2DDraw.cpp

C2DDraw.h

#pragma once

#include "DX9Obj.h"

二维绘图类

class C2DDraw :public CDX9Obj //CDX9Obj是个抽象类，它规定了类的接口

{

public:

C2DDraw(LPCWSTR pFilename) //可以是JPG文件，图片尺寸会自动拉缩

{

m_pFilename = pFilename;

m_pSurface=NULL;

}

~C2DDraw(void)

{

SAFE_RELEASE(m_pSurface);

}

public:

//Callback 函数列表

HRESULT OnCreateDevice( IDirect3DDevice9* pd3dDevice, const D3DSURFACE_DESC* pBackBufferSurfaceDesc,

void* pUserContext ) ;

void OnLostDevice( void* pUserContext ) ;

HRESULT OnResetDevice( IDirect3DDevice9* pd3dDevice, const D3DSURFACE_DESC* pBackBufferSurfaceDesc,

void* pUserContext ) ;

void OnDestroyDevice( void* pUserContext ) ;

//Render

void OnFrameRender( IDirect3DDevice9* pd3dDevice, double fTime, float fElapsedTime, void* pUserContext ) ;

private:

LPDIRECT3DSURFACE9 m_pSurface;

LPCWSTR m_pFilename;

HRESULT createSurfaces( IDirect3DDevice9* pd3dDevice, const D3DSURFACE_DESC* pBackBufferSurfaceDesc);

};

C2DDraw.cpp

#include "dxut.h"

#include "C2DDraw.h"

//Callback 函数列表

HRESULT C2DDraw::OnCreateDevice( IDirect3DDevice9* pd3dDevice, const D3DSURFACE_DESC* pBackBufferSurfaceDesc,

void* pUserContext )

{

return createSurfaces(pd3dDevice,pBackBufferSurfaceDesc);

}

void C2DDraw::OnLostDevice( void* pUserContext )

{

SAFE_RELEASE(m_pSurface);

}

HRESULT C2DDraw::OnResetDevice( IDirect3DDevice9* pd3dDevice, const D3DSURFACE_DESC* pBackBufferSurfaceDesc,

void* pUserContext )

{

SAFE_RELEASE(m_pSurface);

return createSurfaces(pd3dDevice,pBackBufferSurfaceDesc);

}

void C2DDraw::OnDestroyDevice( void* pUserContext )

{

SAFE_RELEASE(m_pSurface);

}

//Render

void C2DDraw::OnFrameRender( IDirect3DDevice9* pd3dDevice, double fTime, float fElapsedTime, void* pUserContext )

{

// This will hold the back buffer

IDirect3DSurface9* backbuffer = NULL;

// Check to make sure you have a valid Direct3D device

if( NULL == pd3dDevice )

return;

// Clear the back buffer to a blue color

//pd3dDevice->Clear( 0, NULL, D3DCLEAR_TARGET,D3DCOLOR_XRGB(0,0,255), 1.0f, 0 );

// Get the back buffer

pd3dDevice->GetBackBuffer( 0,0,D3DBACKBUFFER_TYPE_MONO,&backbuffer );

// Copy the offscreen surface to the back buffer

// Note the use of NULL values for the source and destination RECTs

// This ensures a copy of the entire surface to the back buffer

//m_surface -> backbuffer

pd3dDevice->StretchRect( m_pSurface,NULL,backbuffer,NULL,D3DTEXF_NONE );

// Present the back buffer contents to the display

//pd3dDevice->Present ( NULL, NULL, NULL, NULL );

SAFE_RELEASE(backbuffer);

}

HRESULT C2DDraw::createSurfaces( IDirect3DDevice9* pd3dDevice, const D3DSURFACE_DESC* pBackBufferSurfaceDesc)

{

HRESULT hr;

V_RETURN( pd3dDevice->CreateOffscreenPlainSurface(

pBackBufferSurfaceDesc->Width, // the width of the surface to create

pBackBufferSurfaceDesc->Height, // the height of the surface to create

D3DFMT_X8R8G8B8, // the surface format

D3DPOOL_DEFAULT, // the memory pool to use

&m_pSurface, // holds the resulting surface

NULL) ); // reserved; should be NULL

V_RETURN( D3DXLoadSurfaceFromFile( m_pSurface,NULL,NULL,m_pFilename,NULL,D3DX_DEFAULT,0,NULL ) );

return hr;

}