D3D的第一个例子

最新推荐文章于 2022-04-15 22:11:20 发布

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最新推荐文章于 2022-04-15 22:11:20 发布

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分类专栏： DirectX 文章标签： vb float 框架 up 编程 api

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玩了2天NBA live08，最后一场和网友打了4个加时，还是输了。吃完饭时在想，我玩NBA到底收获了什么，感觉虚度了2天光阴啊～好好学习吧！我如是想到。

今天看书写了第一个D3D的例子,写篇博客以示纪念,一个旋转的立方体,没什么技术含量,无非是调用一些MS的API,可是内部怎么执行的我还是不知道,打算这学期看完LaMothe的<<3D游戏编程大师技巧>>搞清楚相关数学原理,任重而道远啊！

代码清单:

 
 // 
// 
// File: cube.cpp 
// by tianzhihen  
// 2008.10.12 
// MSVC++ 8.0 
// 
#include "d3dUtility.h" 
// 
//  全局变量 
// 
IDirect3DDevice9* Device = 0;
const int Width  = 640;
const int Height = 480;
IDirect3DVertexBuffer9* VB = 0;
IDirect3DIndexBuffer9*  IB = 0;
// 
// 类和结构体 
// 
struct Vertex 
{
    Vertex(){}
    Vertex(float x,float y,float z)
    {
        _x = x; _y = y; _z = z;
    }
    float _x,_y,_z;
    static const DWORD FVF;
};
const DWORD Vertex::FVF = D3DFVF_XYZ;
// 
// 框架函数 
// 
bool Setup()
{
    // 
    // 创建顶点/索引缓存 
    //   
    Device->CreateVertexBuffer(
        8*sizeof(Vertex),
        D3DUSAGE_WRITEONLY, // 只写 
        Vertex::FVF,
        D3DPOOL_MANAGED,
        &VB,
        0);
    Device->CreateIndexBuffer(
        36*sizeof(WORD),
        D3DUSAGE_WRITEONLY,
        D3DFMT_INDEX16,
        D3DPOOL_MANAGED,
        &IB,
        0);
    // 
    // 用立方体数据填充缓存 
    // 
    Vertex* vertices;
    VB->Lock(0,0,(void**)&vertices,0);
        
    vertices[0] = Vertex(-1.0f, -1.0f, -1.0f);
    vertices[1] = Vertex(-1.0f,  1.0f, -1.0f);
    vertices[2] = Vertex( 1.0f,  1.0f, -1.0f);
    vertices[3] = Vertex( 1.0f, -1.0f, -1.0f);
    vertices[4] = Vertex(-1.0f, -1.0f,  1.0f);
    vertices[5] = Vertex(-1.0f,  1.0f,  1.0f);
    vertices[6] = Vertex( 1.0f,  1.0f,  1.0f);
    vertices[7] = Vertex( 1.0f, -1.0f,  1.0f);
    VB->Unlock();
    WORD* indices = 0;
    IB->Lock(0,0,(void**)&indices,0);
    // front side 
    indices[0]  = 0; indices[1]  = 1; indices[2]  = 2;
    indices[3]  = 0; indices[4]  = 2; indices[5]  = 3;
    // back side 
    indices[6]  = 4; indices[7]  = 6; indices[8]  = 5;
    indices[9]  = 4; indices[10] = 7; indices[11] = 6;
    // left side 
    indices[12] = 4; indices[13] = 5; indices[14] = 1;
    indices[15] = 4; indices[16] = 1; indices[17] = 0;
    // right side 
    indices[18] = 3; indices[19] = 2; indices[20] = 6;
    indices[21] = 3; indices[22] = 6; indices[23] = 7;
    // top 
    indices[24] = 1; indices[25] = 5; indices[26] = 6;
    indices[27] = 1; indices[28] = 6; indices[29] = 2;
    // bottom 
    indices[30] = 4; indices[31] = 0; indices[32] = 3;
    indices[33] = 4; indices[34] = 3; indices[35] = 7;
    IB->Unlock();
    // 
    // 创建取景变换矩阵 
    // 
    D3DXVECTOR3 position(0.0f,0.0f,-5.0f);
    D3DXVECTOR3 target(0.0f,0.0f,0.0f);
    D3DXVECTOR3 up(0.0f,1.0f,0.0f);
    D3DXMATRIX V;
    D3DXMatrixLookAtLH(&V,&position,&target,&up);
    Device->SetTransform(D3DTS_VIEW,&V);
    // 
    // 设置投影矩阵 
    // 
    D3DXMATRIX proj;
    D3DXMatrixPerspectiveFovLH(
                &proj,
                D3DX_PI*0.5f,
                (float)Width/(float)Height,
                1.0f,
                1000.0f);
    Device->SetTransform(D3DTS_PROJECTION,&proj);
    // 
    // 选择绘制状态(线框状态) 
    // 
    Device->SetRenderState(D3DRS_FILLMODE,D3DFILL_WIREFRAME);
    return true;
}
void Cleanup()
{
    d3d::Release<IDirect3DVertexBuffer9*>(VB);
    d3d::Release<IDirect3DIndexBuffer9*>(IB);
}
bool Display(float timeDelta)
{
    if (Device)
    {
        // 
        // 旋转矩阵 
        // 
        D3DXMATRIX Rx,Ry;
        // 绕 x 方向每帧转45度 
        D3DXMatrixRotationX(&Rx,3.14f/4.0f);
        // 绕 y 方向每帧递增角度 
        static float y = 0.0f;
        D3DXMatrixRotationY(&Ry,y);
        y += timeDelta;
        // 角度达到360度后归零 
        if (y>=6.28f)
        {
            y = 0.0f;
        }
        // 结合x and y 方向的旋转角度 
        D3DXMATRIX p = Rx * Ry;
        Device->SetTransform(D3DTS_WORLD,&p);
        // 
        // 绘制场景 
        // 
        Device->Clear(0,0,D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER , 0xffffffff,1.0f,0);
        Device->BeginScene();
        Device->SetStreamSource(0,VB,0,sizeof(Vertex));
        Device->SetIndices(IB);
        Device->SetFVF(Vertex::FVF);
        // 绘制立方体 
        Device->DrawIndexedPrimitive(D3DPT_TRIANGLELIST,0,0,8,0,12);
        Device->EndScene();
        Device->Present(0,0,0,0);
    }
    return true;
}
// 
// WndProc 
// 
LRESULT CALLBACK d3d::WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam )
{
    switch(msg)
    {
    case WM_DESTROY:
        ::PostQuitMessage(0);
        break;
    case WM_KEYDOWN:
        if(wParam == VK_ESCAPE)
            ::DestroyWindow(hwnd);
        break;
    }
    return ::DefWindowProc(hwnd,msg,wParam,lParam);
}
// 
//  WinMain 
// 
int WINAPI WinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance, 
                   LPSTR lpCmdLine,
                   int nShowCmd )
{
    //程序入口地址 
    //初始化D3D 
    if (!d3d::InitD3D(hInstance,640,480,true,D3DDEVTYPE_HAL,&Device))
    {
        ::MessageBox(0, "InitD3D() - FAILED", 0, 0);
        return 0;
    }
    //分配资源 
    if (!Setup())
    {
        ::MessageBox(0, "Setup() - FAILED", 0, 0);
        return 0;
    }
    //进入消息循环 
    d3d::EnterMsgLoop(Display);
    //清理资源 
    Cleanup();
    Device->Release();
    return 0;
}
 