ch5p1_xfileloader.cpp

游戏开发特殊技巧-special.effects.game.programming

/*
#############################################################################

  Ch5p1_XFileLoader.cpp: a program that demonstrates how to load a .X file
  using DirectX 8.0.

  This program is based on a Direct3D sample program (tutorial).

#############################################################################
*/

// include files ////////////////////////////////////////////////////////////

#include <d3dx8.h>
#include <mmsystem.h>

//-----------------------------------------------------------------------------
// Global variables
//-----------------------------------------------------------------------------
LPDIRECT3D8             g_pD3D           = NULL; // Used to create the D3DDevice
LPDIRECT3DDEVICE8       g_pd3dDevice     = NULL; // Our rendering device

LPD3DXMESH              g_pMesh          = NULL; // Our mesh object in sysmem
D3DMATERIAL8*           g_pMeshMaterials = NULL; // Materials for our mesh
LPDIRECT3DTEXTURE8*     g_pMeshTextures  = NULL; // Textures for our mesh
DWORD                   g_dwNumMaterials = 0L;   // Number of mesh materials

//-----------------------------------------------------------------------------
// Name: InitD3D()
// Desc: Initializes Direct3D
//-----------------------------------------------------------------------------
HRESULT InitD3D( HWND hWnd )
{
    // Create the D3D object.
    if( NULL == ( g_pD3D = Direct3DCreate8( D3D_SDK_VERSION ) ) )
        return E_FAIL;

    // Get the current desktop display mode, so we can set up a back
    // buffer of the same format
    D3DDISPLAYMODE d3ddm;
    if( FAILED( g_pD3D->GetAdapterDisplayMode( D3DADAPTER_DEFAULT, &d3ddm ) ) )
        return E_FAIL;

    // Set up the structure used to create the D3DDevice. Since we are now
    // using more complex geometry, we will create a device with a zbuffer.
    D3DPRESENT_PARAMETERS d3dpp; 
    ZeroMemory( &d3dpp, sizeof(d3dpp) );
    d3dpp.Windowed = TRUE;
    d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
    d3dpp.BackBufferFormat = d3ddm.Format;
    d3dpp.EnableAutoDepthStencil = TRUE;
    d3dpp.AutoDepthStencilFormat = D3DFMT_D16;

    // Create the D3DDevice
    if( FAILED( g_pD3D->CreateDevice( D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWnd,
                                      D3DCREATE_SOFTWARE_VERTEXPROCESSING,
                                      &d3dpp, &g_pd3dDevice ) ) )
    {
        return E_FAIL;
    }

    // Turn on the zbuffer
    g_pd3dDevice->SetRenderState( D3DRS_ZENABLE, TRUE );

    // Turn on ambient lighting 
    g_pd3dDevice->SetRenderState( D3DRS_AMBIENT, 0xffffffff );

    return S_OK;
}

//-----------------------------------------------------------------------------
// Name: InitGeometry()
// Desc: Load the mesh and build the material and texture arrays
//-----------------------------------------------------------------------------
HRESULT InitGeometry(char *strFilename)
{
    LPD3DXBUFFER pD3DXMtrlBuffer;

    // Load the mesh from the specified file
    if( FAILED( D3DXLoadMeshFromX( strFilename, D3DXMESH_SYSTEMMEM, 
                                   g_pd3dDevice, NULL, 
                                   &pD3DXMtrlBuffer, &g_dwNumMaterials, 
                                   &g_pMesh ) ) )
    {
        return E_FAIL;
    }

    // We need to extract the material properties and texture names from the 
    // pD3DXMtrlBuffer
    D3DXMATERIAL* d3dxMaterials = (D3DXMATERIAL*)pD3DXMtrlBuffer->GetBufferPointer();
    g_pMeshMaterials = new D3DMATERIAL8[g_dwNumMaterials];
    g_pMeshTextures  = new LPDIRECT3DTEXTURE8[g_dwNumMaterials];

    for( DWORD i=0; i<g_dwNumMaterials; i++ )
    {
        // Copy the material
        g_pMeshMaterials[i] = d3dxMaterials[i].MatD3D;

        // Set the ambient color for the material (D3DX does not do this)
        g_pMeshMaterials[i].Ambient = g_pMeshMaterials[i].Diffuse;
     
        // Create the texture
        if( FAILED( D3DXCreateTextureFromFile( g_pd3dDevice, 
                                               d3dxMaterials[i].pTextureFilename, 
                                               &g_pMeshTextures[i] ) ) )
        {
            g_pMeshTextures[i] = NULL;
        }
    }

    // Done with the material buffer
    pD3DXMtrlBuffer->Release();

    return S_OK;
}

//-----------------------------------------------------------------------------
// Name: Render()
// Desc: Draws the scene
//-----------------------------------------------------------------------------
VOID Render()
{
    // Clear the backbuffer and the zbuffer
    g_pd3dDevice->Clear( 0, NULL, D3DCLEAR_TARGET|D3DCLEAR_ZBUFFER, 
                         D3DCOLOR_XRGB(0,0,64), 1.0f, 0 );
    
    // Begin the scene
    g_pd3dDevice->BeginScene();

    // For our world matrix, we will just leave it as the identity
    D3DXMATRIX matWorld;
    D3DXMatrixRotationY( &matWorld, timeGetTime()/1000.0f );
    g_pd3dDevice->SetTransform( D3DTS_WORLD, &matWorld );

    D3DXMATRIX matView;
    D3DXMatrixLookAtLH( &matView, &D3DXVECTOR3( 0.0f, 3.0f,-5.0f ), 
                                  &D3DXVECTOR3( 0.0f, 0.0f, 0.0f ), 
                                  &D3DXVECTOR3( 0.0f, 1.0f, 0.0f ) );
    g_pd3dDevice->SetTransform( D3DTS_VIEW, &matView );

    D3DXMATRIX matProj;
    D3DXMatrixPerspectiveFovLH( &matProj, D3DX_PI/4, 1.0f, 1.0f, 100.0f );
    g_pd3dDevice->SetTransform( D3DTS_PROJECTION, &matProj );

    // Meshes are divided into subsets, one for each material. Render them in
    // a loop
    for( DWORD i=0; i<g_dwNumMaterials; i++ )
    {
        // Set the material and texture for this subset
        g_pd3dDevice->SetMaterial( &g_pMeshMaterials[i] );
        g_pd3dDevice->SetTexture( 0, g_pMeshTextures[i] );
        
        // Draw the mesh subset
        g_pMesh->DrawSubset( i );
    }

    // End the scene
    g_pd3dDevice->EndScene();
    
    // Present the backbuffer contents to the display
    g_pd3dDevice->Present( NULL, NULL, NULL, NULL );
}

//-----------------------------------------------------------------------------
// Name: MsgProc()
// Desc: The window's message handler
//-----------------------------------------------------------------------------
LRESULT WINAPI MsgProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam )
{
    switch( msg )
    {
        case WM_DESTROY:
            PostQuitMessage( 0 );
            return 0;
    }

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

//-----------------------------------------------------------------------------
// Name: WinMain()
// Desc: The application's entry point
//-----------------------------------------------------------------------------
INT WINAPI WinMain( HINSTANCE hInst, HINSTANCE, LPSTR, INT )
{
    // Register the window class
    WNDCLASSEX wc = { sizeof(WNDCLASSEX), CS_CLASSDC, MsgProc, 0L, 0L, 
                      GetModuleHandle(NULL), NULL, NULL, NULL, NULL,
                      "Ch5p1_XFileLoader", NULL };
    RegisterClassEx( &wc );

    // Create the application's window
    HWND hWnd = CreateWindow( "Ch5p1_XFileLoader", "Ch5p1_XFileLoader", 
                              WS_OVERLAPPEDWINDOW, 100, 100, 300, 300,
                              GetDesktopWindow(), NULL, wc.hInstance, NULL );

    // Initialize Direct3D
    if( SUCCEEDED( InitD3D( hWnd ) ) )
    { 
        // Create the scene geometry
        if( SUCCEEDED( InitGeometry("Ch5p1_Tiger.x") ) )
        {
            // Show the window
            ShowWindow( hWnd, SW_SHOWDEFAULT );
            UpdateWindow( hWnd );

            // Enter the message loop
            MSG msg; 
            ZeroMemory( &msg, sizeof(msg) );
            while( msg.message!=WM_QUIT )
            {
                if( PeekMessage( &msg, NULL, 0U, 0U, PM_REMOVE ) )
                {
                    TranslateMessage( &msg );
                    DispatchMessage( &msg );
                }
                else
                    Render();
            }
        }
    }

    // clean up
    if( g_pMeshMaterials != NULL ) 
        delete[] g_pMeshMaterials;

    if( g_pMeshTextures )
    {
        for( DWORD i = 0; i < g_dwNumMaterials; i++ )
        {
            if( g_pMeshTextures[i] )
                g_pMeshTextures[i]->Release();
        }
        delete[] g_pMeshTextures;
    }
    if( g_pMesh != NULL )
        g_pMesh->Release();
    
    if( g_pd3dDevice != NULL )
        g_pd3dDevice->Release();

    if( g_pD3D != NULL )
        g_pD3D->Release();
    UnregisterClass( "Ch5p1_XFileLoader", wc.hInstance );
    return 0;
}