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2019
11-29

D3D渲染到纹理

D3D渲染到纹理 - 第1张  | 逗分享开发经验代码

//=============================================================================
// Desc: 纹理影射基础
//=============================================================================

#include 
<d3dx9.h>

//-----------------------------------------------------------------------------
// Desc: 全局变量
//-----------------------------------------------------------------------------
LPDIRECT3D9             g_pD3D       = NULL;    //Direct3D对象
LPDIRECT3DDEVICE9       g_pd3dDevice = NULL;    //Direct3D设备对象
LPDIRECT3DVERTEXBUFFER9 g_pVB        = NULL;    //顶点缓冲区对象
LPDIRECT3DTEXTURE9      g_pTexture   = NULL;    //纹理对象

LPDIRECT3DTEXTURE9      g_pRender2Tex 
= NULL;
LPDIRECT3DSURFACE9      g_pRenderSur 
= NULL;
LPDIRECT3DSURFACE9      g_pBackupSur 
= NULL;

//-----------------------------------------------------------------------------
// Desc: 顶点结构
//-----------------------------------------------------------------------------
struct CUSTOMVERTEX
{
    FLOAT x, y, z;    
//顶点位置  
    FLOAT u,v ;          //顶点纹理坐标
};
#define D3DFVF_CUSTOMVERTEX   (D3DFVF_XYZ|D3DFVF_TEX1)

//-----------------------------------------------------------------------------
// Desc: 设置变换矩阵
//-----------------------------------------------------------------------------
VOID SetupMatrices()
{
    
//创建并设置世界矩阵
    D3DXMATRIXA16 matWorld;
    D3DXMatrixIdentity( 
&matWorld );
    g_pd3dDevice
->SetTransform( D3DTS_WORLD, &matWorld );

    //创建并设置观察矩阵
    D3DXVECTOR3 vEyePt( 0.0f0.0f-10 );
    D3DXVECTOR3 vLookatPt( 
0.0f0.0f0.0f );
    D3DXVECTOR3 vUpVec( 
0.0f1.0f0.0f );
    D3DXMATRIXA16 matView;
    D3DXMatrixLookAtLH( 
&matView, &vEyePt, &vLookatPt, &vUpVec );
    g_pd3dDevice
->SetTransform( D3DTS_VIEW, &matView );

    //创建并设置投影矩阵
    D3DXMATRIXA16 matProj;
    D3DXMatrixPerspectiveFovLH( 
&matProj, D3DX_PI/41.0f1.0f100.0f );
    g_pd3dDevice
->SetTransform( D3DTS_PROJECTION, &matProj );
}

//-----------------------------------------------------------------------------
// Desc: 初始化Direct3D
//-----------------------------------------------------------------------------
HRESULT InitD3D( HWND hWnd )
{
    
//创建Direct3D对象, 该对象用于创建Direct3D设备对象
    if( NULL == ( g_pD3D = Direct3DCreate9( D3D_SDK_VERSION ) ) )
        
return E_FAIL;

    //设置D3DPRESENT_PARAMETERS结构, 准备创建Direct3D设备对象
    D3DPRESENT_PARAMETERS d3dpp;
    ZeroMemory( 
&d3dpp, sizeof(d3dpp) );
    d3dpp.Windowed 
= TRUE;
    d3dpp.SwapEffect 
= D3DSWAPEFFECT_DISCARD;
    d3dpp.BackBufferFormat 
= D3DFMT_X8R8G8B8;

    //创建Direct3D设备对象
    if( FAILED( g_pD3D->CreateDevice( D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWnd,
                                      D3DCREATE_SOFTWARE_VERTEXPROCESSING,
                                      
&d3dpp, &g_pd3dDevice ) ) )
    {
        
return E_FAIL;
    }

    //禁用照明效果
    g_pd3dDevice->SetRenderState( D3DRS_LIGHTING, FALSE ); 

    //设置变换矩阵
    SetupMatrices();

    HRESULT hr = g_pd3dDevice->CreateTexture(256,256,1,D3DUSAGE_RENDERTARGET,
        D3DFMT_X8R8G8B8, D3DPOOL_DEFAULT, 
&g_pRender2Tex, NULL);
    
if (FAILED(hr))
    {
        
return E_FAIL;
    }
    g_pRender2Tex
->GetSurfaceLevel(0&g_pRenderSur);
    
    
return S_OK;
}

//-----------------------------------------------------------------------------
// Desc: 创建场景图形
//-----------------------------------------------------------------------------
HRESULT InitGriphics()
{
    
//创建纹理对象
    if( FAILED( D3DXCreateTextureFromFile( g_pd3dDevice, L"texture.jpg"&g_pTexture ) ) )
    {
       MessageBox(NULL, L
"创建纹理失败", L"Texture.exe", MB_OK);
       
return E_FAIL;
    }

    //顶点数据
    CUSTOMVERTEX g_Vertices[] =
    {
        { 
-3,   -3,  0.0f,  0.0f1.0f},   
        { 
-3,    3,  0.0f,  0.0f0.0f},    
        {  
3,   -3,  0.0f,  1.0f1.0f},    
        {  
3,    3,  0.0f,  1.0f0.0f }

    };
    
    //创建顶点缓冲区
    if( FAILED( g_pd3dDevice->CreateVertexBuffer( 4*sizeof(CUSTOMVERTEX),
                                                 
0, D3DFVF_CUSTOMVERTEX,
                                                 D3DPOOL_MANAGED, 
&g_pVB,NULL ) ) )
    {
        
return E_FAIL;
    }

    //填充顶点缓冲区
    VOID* pVertices;
    
if( FAILED( g_pVB->Lock( 0sizeof(g_Vertices), (void**)&pVertices, 0 ) ) )
        
return E_FAIL;
    memcpy( pVertices, g_Vertices, 
sizeof(g_Vertices) );
    g_pVB
->Unlock();

    return S_OK;
}

//-----------------------------------------------------------------------------
// Desc: 释放创建的对象
//-----------------------------------------------------------------------------
VOID Cleanup()
{
    
//释放纹理对象
    if( g_pTexture != NULL )
        g_pTexture
->Release();

    //释放顶点缓冲区对象
    if( g_pVB != NULL )        
        g_pVB
->Release();

    //释放Direct3D设备对象
    if( g_pd3dDevice != NULL ) 
        g_pd3dDevice
->Release();

    //释放Direct3D对象
    if( g_pD3D != NULL )       
        g_pD3D
->Release();
}

//-----------------------------------------------------------------------------
// Desc: 渲染图形 
//-----------------------------------------------------------------------------
VOID Render()
{
    
//清空后台缓冲区
    g_pd3dDevice->Clear( 0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(4550170), 1.0f0 );
    
    
//开始在后台缓冲区绘制图形
    if( SUCCEEDED( g_pd3dDevice->BeginScene() ) )
    {
        g_pd3dDevice
->GetRenderTarget(0&g_pBackupSur);
        g_pd3dDevice
->SetRenderTarget(0, g_pRenderSur);

        /*RTT*/
        g_pd3dDevice
->Clear( 0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(000), 1.0f0 );
        g_pd3dDevice
->SetTexture( 0, g_pTexture ); //设置纹理
        g_pd3dDevice->SetStreamSource( 0, g_pVB, 0sizeof(CUSTOMVERTEX) );
        g_pd3dDevice
->SetFVF( D3DFVF_CUSTOMVERTEX );
        g_pd3dDevice
->DrawPrimitive( D3DPT_TRIANGLESTRIP, 02);

        D3DXSaveTextureToFileA("tt.tga", D3DXIFF_TGA, g_pRender2Tex, NULL);

        /*真是场景*/
        g_pd3dDevice
->SetRenderTarget(0, g_pBackupSur);

        g_pd3dDevice->SetTexture( 0, g_pTexture ); //设置纹理
        g_pd3dDevice->SetStreamSource( 0, g_pVB, 0sizeof(CUSTOMVERTEX) );
        g_pd3dDevice
->SetFVF( D3DFVF_CUSTOMVERTEX );
        g_pd3dDevice
->DrawPrimitive( D3DPT_TRIANGLESTRIP, 02);

        //结束在后台缓冲区绘制图形
        g_pd3dDevice->EndScene();
    }

    //将在后台缓冲区绘制的图形提交到前台缓冲区显示
    g_pd3dDevice->Present( NULL, NULL, NULL, NULL );
}

//-----------------------------------------------------------------------------
// Desc: 消息处理
//-----------------------------------------------------------------------------
LRESULT WINAPI MsgProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam )
{
    
switch( msg )
    {
    
case WM_DESTROY:
        Cleanup();
        PostQuitMessage( 
0 );
        
return 0;
    }

    return DefWindowProc( hWnd, msg, wParam, lParam );
}

//-----------------------------------------------------------------------------
// Desc: 入口函数
//-----------------------------------------------------------------------------
INT WINAPI WinMain( HINSTANCE hInst, HINSTANCE, LPSTR, INT )
{

    //注册窗口类
    WNDCLASSEX wc = { sizeof(WNDCLASSEX), CS_CLASSDC, MsgProc, 0L0L,
                      GetModuleHandle(NULL), NULL, NULL, NULL, NULL,
                       L
"ClassName", NULL };
    RegisterClassEx( 
&wc );

    //创建窗口
    HWND hWnd = CreateWindow(  L"ClassName", L"纹理影射基础",
                              WS_OVERLAPPEDWINDOW, 
200100800600,
                              GetDesktopWindow(), NULL, wc.hInstance, NULL );

    //初始化Direct3D
    if( SUCCEEDED( InitD3D( hWnd ) ) )
    {
        
//创建场景图形
        if( SUCCEEDED( InitGriphics() ) )
        {
            
//显示窗口
            ShowWindow( hWnd, SW_SHOWDEFAULT );
            UpdateWindow( hWnd );

            //进入消息循环
            MSG msg;
            ZeroMemory( 
&msg, sizeof(msg) );
            
while( msg.message!=WM_QUIT )
            {
                
if( PeekMessage( &msg, NULL, 0U0U, PM_REMOVE ) )
                {
                    TranslateMessage( 
&msg );
                    DispatchMessage( 
&msg );
                }
                
else
                {
                    Render();  
//渲染图形
                }
            }
        }
    }

    UnregisterClass(  L"ClassName", wc.hInstance );
    
return 0;
}

 

最后编辑:
作者:搬运工
这个作者貌似有点懒,什么都没有留下。