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//=============================================================================
// Desc: 使用顶点缓冲区绘制三角形
//=============================================================================

#include 
<d3d9.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


//-----------------------------------------------------------------------------
// Desc: 顶点结构
//-----------------------------------------------------------------------------
struct CUSTOMVERTEX
{
    FLOAT x, y, z, rhw;
    DWORD color;
};
#define D3DFVF_CUSTOMVERTEX (D3DFVF_XYZRHW|D3DFVF_DIFFUSE)  //顶点格式


//-----------------------------------------------------------------------------
// 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_UNKNOWN;

    
//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;
    }

    
//启用Alpha混合, 设置混合系数
    g_pd3dDevice->SetRenderState( D3DRS_ALPHABLENDENABLE,   true );
    g_pd3dDevice
->SetRenderState( D3DRS_SRCBLEND,  D3DBLEND_SRCALPHA );
    g_pd3dDevice
->SetRenderState( D3DRS_DESTBLEND, D3DBLEND_INVSRCALPHA );

    
return S_OK;
}


//-----------------------------------------------------------------------------
// Desc: 创建并填充顶点缓冲区
//-----------------------------------------------------------------------------
HRESULT InitVB()
{
    
//顶点数据
    CUSTOMVERTEX vertices[] =
    {
        { 
100.0f400.0f0.5f1.0f0x50ff0000, },
        { 
300.0f,  50.0f0.5f1.0f0x50ff0000, }, 
        { 
500.0f400.0f0.5f1.0f0x50ff0000, },
    };

    
//创建顶点缓冲区
    if( FAILED( g_pd3dDevice->CreateVertexBuffer( 3*sizeof(CUSTOMVERTEX),
                                                  
0, D3DFVF_CUSTOMVERTEX,
                                                  D3DPOOL_DEFAULT, 
&g_pVB, NULL ) ) )
    {
        
return E_FAIL;
    }

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

    
return S_OK;
}


//-----------------------------------------------------------------------------
// Desc: 释放创建的对象
//-----------------------------------------------------------------------------
VOID Cleanup()
{
    
//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() ) )
    {
        
//在后台缓冲区绘制图形
        g_pd3dDevice->SetStreamSource( 0, g_pVB, 0sizeof(CUSTOMVERTEX) );
        g_pd3dDevice
->SetFVF( D3DFVF_CUSTOMVERTEX );
        g_pd3dDevice
->DrawPrimitive( D3DPT_TRIANGLELIST, 01 );

        
//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;

    
case WM_KEYDOWN:
        
switch(wParam)
        {
        
case 48:  //"0"键, 禁用Alpha混合
            g_pd3dDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, false);
            
break;

        
case 49//"1"键, 激活Alpha混合
            g_pd3dDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, true);
            
break;
        }
    }

    
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"顶点Alpha",
                              WS_OVERLAPPEDWINDOW, 
200100600500,
                              GetDesktopWindow(), NULL, wc.hInstance, NULL );

    
//初始化Direct3D
    if( SUCCEEDED( InitD3D( hWnd ) ) )
    {
        
//创建并填充顶点缓冲区
        if( SUCCEEDED( InitVB() ) )
        {
            
//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;
}














posted on 2008-03-25 21:20 七星重剑 阅读(363) 评论(0)  编辑 收藏 引用 所属分类: Game Graphics

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