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//=============================================================================
// Desc: 基于范圍的霧化效果
//=============================================================================
#include <d3dx9.h>
//-----------------------------------------------------------------------------
// 全局變量
//-----------------------------------------------------------------------------
LPDIRECT3D9 g_pD3D = NULL; //Direct3D對象
LPDIRECT3DDEVICE9 g_pd3dDevice = NULL; //Direct3D設備對象
LPD3DXMESH g_pMesh = NULL; //網(wǎng)格模型對象
D3DMATERIAL9* g_pMeshMaterials = NULL; //網(wǎng)格模型材料
LPDIRECT3DTEXTURE9* g_pMeshTextures = NULL; //網(wǎng)格模型紋理
DWORD g_dwNumMaterials = 0L; //網(wǎng)格模型子塊數(shù)量
//----------------------------------------------------------------------------
// Desc:
//----------------------------------------------------------------------------
inline FLOAT HeightField( FLOAT x, FLOAT z )
{
FLOAT y = 0.0f;
y += 10.0f * cosf( 0.051f*x + 0.0f ) * sinf( 0.055f*x + 0.0f );
y += 10.0f * cosf( 0.053f*z + 0.0f ) * sinf( 0.057f*z + 0.0f );
y += 2.0f * cosf( 0.101f*x + 0.0f ) * sinf( 0.105f*x + 0.0f );
y += 2.0f * cosf( 0.103f*z + 0.0f ) * sinf( 0.107f*z + 0.0f );
y += 2.0f * cosf( 0.251f*x + 0.0f ) * sinf( 0.255f*x + 0.0f );
y += 2.0f * cosf( 0.253f*z + 0.0f ) * sinf( 0.257f*z + 0.0f );
return y;
}
//-----------------------------------------------------------------------------
// Desc: 初始化Direct3D
//-----------------------------------------------------------------------------
HRESULT InitD3D( HWND hWnd )
{
//創(chuàng)建Direct3D對象, 該對象用來創(chuàng)建Direct3D設備對象
if( NULL == ( g_pD3D = Direct3DCreate9( D3D_SDK_VERSION ) ) )
return E_FAIL;
//設置D3DPRESENT_PARAMETERS結(jié)構(gòu), 準備創(chuàng)建Direct3D設備對象
D3DPRESENT_PARAMETERS d3dpp;
ZeroMemory( &d3dpp, sizeof(d3dpp) );
d3dpp.Windowed = TRUE;
d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
d3dpp.BackBufferFormat = D3DFMT_UNKNOWN;
d3dpp.EnableAutoDepthStencil = TRUE;
d3dpp.AutoDepthStencilFormat = D3DFMT_D16;
//創(chuàng)建Direct3D設備對象
if( FAILED( g_pD3D->CreateDevice( D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWnd,
D3DCREATE_SOFTWARE_VERTEXPROCESSING,
&d3dpp, &g_pd3dDevice ) ) )
{
return E_FAIL;
}
//檢查是否支持基于范圍的霧化
D3DCAPS9 stCaps;
g_pd3dDevice->GetDeviceCaps(&stCaps);
if(!(stCaps.RasterCaps & D3DPRASTERCAPS_FOGRANGE))
return E_FAIL;
//設置環(huán)境光
g_pd3dDevice->SetRenderState( D3DRS_AMBIENT, 0xffffffff );
//霧化設置
g_pd3dDevice->SetRenderState(D3DRS_FOGENABLE, true);
g_pd3dDevice->SetRenderState(D3DRS_FOGCOLOR, 0xff0000ff);
g_pd3dDevice->SetRenderState(D3DRS_FOGVERTEXMODE, D3DFOG_LINEAR);
float fogStart = 50; //線性霧化開始位置
float fogEnd = 200; //線性霧化結(jié)束位置
g_pd3dDevice->SetRenderState(D3DRS_FOGSTART, *(DWORD*)&fogStart);
g_pd3dDevice->SetRenderState(D3DRS_FOGEND, *(DWORD*)&fogEnd);
g_pd3dDevice->SetRenderState(D3DRS_RANGEFOGENABLE, true); //啟用基于范圍的霧化
//設置紋理過濾狀態(tài)
g_pd3dDevice->SetTextureStageState( 0, D3DTSS_COLORARG1, D3DTA_TEXTURE );
g_pd3dDevice->SetTextureStageState( 0, D3DTSS_COLOROP, D3DTOP_SELECTARG1 );
g_pd3dDevice->SetSamplerState( 0, D3DSAMP_MINFILTER, D3DTEXF_LINEAR );
g_pd3dDevice->SetSamplerState( 0, D3DSAMP_MAGFILTER, D3DTEXF_LINEAR );
return S_OK;
}
//-----------------------------------------------------------------------------
// Desc: 從絕對路徑中提取紋理文件名
//-----------------------------------------------------------------------------
void RemovePathFromFileName(LPSTR fullPath, LPWSTR fileName)
{
//先將fullPath的類型變換為LPWSTR
WCHAR wszBuf[MAX_PATH];
MultiByteToWideChar( CP_ACP, 0, fullPath, -1, wszBuf, MAX_PATH );
wszBuf[MAX_PATH-1] = L'\0';
WCHAR* wszFullPath = wszBuf;
//從絕對路徑中提取文件名
LPWSTR pch=wcsrchr(wszFullPath,'\\');
if (pch)
lstrcpy(fileName, ++pch);
else
lstrcpy(fileName, wszFullPath);
}
//-----------------------------------------------------------------------------
// Desc: 創(chuàng)建場景圖形
//-----------------------------------------------------------------------------
HRESULT InitGeometry()
{
LPD3DXBUFFER pD3DXMtrlBuffer; //存儲模型材料的緩沖區(qū)對象
//從磁盤文件加載網(wǎng)格模型
if( FAILED( D3DXLoadMeshFromX( L"seafloor.x", D3DXMESH_SYSTEMMEM,
g_pd3dDevice, NULL,
&pD3DXMtrlBuffer, NULL, &g_dwNumMaterials,
&g_pMesh ) ) )
{
MessageBox(NULL, L"Could not find seafloor.x", L"Fog", MB_OK);
return E_FAIL;
}
//從網(wǎng)格模型中提取材料屬性和紋理文件名
D3DXMATERIAL* d3dxMaterials = (D3DXMATERIAL*)pD3DXMtrlBuffer->GetBufferPointer();
g_pMeshMaterials = new D3DMATERIAL9[g_dwNumMaterials]; //材料結(jié)構(gòu)數(shù)組
if( g_pMeshMaterials == NULL )
return E_OUTOFMEMORY;
g_pMeshTextures = new LPDIRECT3DTEXTURE9[g_dwNumMaterials];
if( g_pMeshTextures == NULL )
return E_OUTOFMEMORY;
//逐塊提取網(wǎng)格模型材料屬性和紋理文件名
for( DWORD i=0; i<g_dwNumMaterials; i++ )
{
//復制材料屬性
g_pMeshMaterials[i] = d3dxMaterials[i].MatD3D;
g_pMeshMaterials[i].Ambient = g_pMeshMaterials[i].Diffuse;
g_pMeshTextures[i] = NULL;
if( d3dxMaterials[i].pTextureFilename != NULL &&
strlen(d3dxMaterials[i].pTextureFilename) > 0 )
{
//獲取紋理文件名
WCHAR filename[256];
RemovePathFromFileName(d3dxMaterials[i].pTextureFilename, filename);
//創(chuàng)建紋理
if( FAILED( D3DXCreateTextureFromFile( g_pd3dDevice, filename,
&g_pMeshTextures[i] ) ) )
{
MessageBox(NULL, L"Could not find texture map", L"Fog", MB_OK);
}
}
}
//釋放在加載模型文件時創(chuàng)建的保存模型材質(zhì)和紋理信息的緩沖區(qū)對象
pD3DXMtrlBuffer->Release();
//修改網(wǎng)格模型
LPDIRECT3DVERTEXBUFFER9 pVB;
if( SUCCEEDED( g_pMesh->GetVertexBuffer( &pVB ) ) )
{
struct VERTEX { FLOAT x,y,z,tu,tv;};
VERTEX* pVertices;
DWORD dwNumVertices = g_pMesh->GetNumVertices();
pVB->Lock( 0, 0, (void**)&pVertices, 0 );
for( DWORD i=0; i<dwNumVertices; i++ )
pVertices[i].y = HeightField( pVertices[i].x, pVertices[i].z );
pVB->Unlock();
pVB->Release();
}
return S_OK;
}
//-----------------------------------------------------------------------------
// Desc: 釋放創(chuàng)建對象
//-----------------------------------------------------------------------------
VOID Cleanup()
{
//釋放網(wǎng)格模型材料
if( g_pMeshMaterials != NULL )
delete[] g_pMeshMaterials;
//釋放網(wǎng)格模型紋理
if( g_pMeshTextures )
{
for( DWORD i = 0; i < g_dwNumMaterials; i++ )
{
if( g_pMeshTextures[i] )
g_pMeshTextures[i]->Release();
}
delete[] g_pMeshTextures;
}
//釋放網(wǎng)格模型對象
if( g_pMesh != NULL )
g_pMesh->Release();
//釋放Direct3D設備對象
if( g_pd3dDevice != NULL)
g_pd3dDevice->Release();
//釋放Direct3D對象
if( g_pD3D != NULL)
g_pD3D->Release();
}
//-------------------------------------------------
// Desc: 設置變換矩陣
//--------------------------------------------------
VOID SetupMatrices()
{
//創(chuàng)建并設置世界矩陣
D3DXMATRIXA16 matWorld;
D3DXMatrixIdentity(&matWorld);
g_pd3dDevice->SetTransform( D3DTS_WORLD, &matWorld );
//創(chuàng)建并設置觀察矩陣
D3DXVECTOR3 vEyePt( 0.0f, 30.0f,-100.0f );
D3DXVECTOR3 vLookatPt( 0.0f, 0.0f, 0.0f );
D3DXVECTOR3 vUpVec( 0.0f, 1.0f, 0.0f );
D3DXMATRIXA16 matView;
D3DXMatrixLookAtLH( &matView, &vEyePt, &vLookatPt, &vUpVec );
g_pd3dDevice->SetTransform( D3DTS_VIEW, &matView );
//創(chuàng)建并設置投影矩陣
D3DXMATRIXA16 matProj;
D3DXMatrixPerspectiveFovLH( &matProj, D3DX_PI/4, 1.0f, 1.0f, 200.0f );
g_pd3dDevice->SetTransform( D3DTS_PROJECTION, &matProj );
}
//-----------------------------------------------------------------------------
// Desc: 渲染圖形
//-----------------------------------------------------------------------------
VOID Render()
{
//清空后臺緩沖區(qū)
g_pd3dDevice->Clear( 0, NULL, D3DCLEAR_TARGET|D3DCLEAR_ZBUFFER,
D3DCOLOR_XRGB(0,0,255), 1.0f, 0 );
//開始在后臺緩沖區(qū)繪制圖形
if( SUCCEEDED( g_pd3dDevice->BeginScene() ) )
{
SetupMatrices(); //設置世界矩陣
//逐塊渲染網(wǎng)格模型
for( DWORD i=0; i<g_dwNumMaterials; i++ )
{
//設置材料和紋理
g_pd3dDevice->SetMaterial( &g_pMeshMaterials[i] );
g_pd3dDevice->SetTexture( 0, g_pMeshTextures[i] );
//渲染模型
g_pMesh->DrawSubset( i );
}
//結(jié)束在后臺緩沖區(qū)渲染圖形
g_pd3dDevice->EndScene();
}
//將在后臺緩沖區(qū)繪制的圖形提交到前臺緩沖區(qū)顯示
g_pd3dDevice->Present( NULL, NULL, NULL, NULL );
}
//-----------------------------------------------------------------------------
// Desc: 消息處理
//-----------------------------------------------------------------------------
LRESULT WINAPI MsgProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam )
{
static bool rangeFog = true;
switch( msg )
{
case WM_DESTROY:
Cleanup();
PostQuitMessage( 0 );
return 0;
case WM_KEYDOWN:
switch(wParam)
{
case 65+'R'-'A': //基于范圍的霧化
rangeFog = !rangeFog;
g_pd3dDevice->SetRenderState(D3DRS_RANGEFOGENABLE, rangeFog);
break;
}
}
return DefWindowProc( hWnd, msg, wParam, lParam );
}
//-----------------------------------------------------------------------------
// Desc: 程序入口
//-----------------------------------------------------------------------------
INT WINAPI WinMain( HINSTANCE hInst, HINSTANCE, LPSTR, INT )
{
//注冊窗口類
WNDCLASSEX wc = { sizeof(WNDCLASSEX), CS_CLASSDC, MsgProc, 0L, 0L,
GetModuleHandle(NULL), NULL, NULL, NULL, NULL,
L"ClassName", NULL };
RegisterClassEx( &wc );
//創(chuàng)建窗口
HWND hWnd = CreateWindow( L"ClassName", L"基于范圍霧化",
WS_OVERLAPPEDWINDOW, 200, 100, 600, 500,
GetDesktopWindow(), NULL, wc.hInstance, NULL );
//初始化Direct3D
if( SUCCEEDED( InitD3D( hWnd ) ) )
{
//創(chuàng)建場景圖形
if( SUCCEEDED( InitGeometry() ) )
{
//顯示窗口
ShowWindow( hWnd, SW_SHOWDEFAULT );
UpdateWindow( hWnd );
//進入消息循環(huán)
MSG msg;
ZeroMemory( &msg, sizeof(msg) );
while( msg.message!=WM_QUIT )
{
if( PeekMessage( &msg, NULL, 0, 0, PM_REMOVE ) )
{
TranslateMessage( &msg );
DispatchMessage( &msg );
}
else
{
Render(); //渲染圖形
}
}
}
}
UnregisterClass( L"ClassName", wc.hInstance );
return 0;
}
posted on 2008-03-27 22:26
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