Direct3D 索引缓存-白红宇

Direct3D 索引缓存

阅读量：4570 次

发布时间：2019-06-08

本文共 7843 字，大约阅读时间需要 26 分钟。

小学的时候我们知道3个顶点组成一个三角形,那么四个顶点我们会说有4个三角形.这就是一个顶点同时参与了四次绘制三角形的结果. 在程序中也一样,比如我们绘制的两个三角形是挨着一起的,总有几个顶点是重合的. 这个顶点是可以重复使用,可以使用顶点缓存来记录如何绘制顶点的顺序,多次使用同一个顶点.到达内存的节省. 下面我们就是用四个顶点绘制出2个三角形

创建索引缓存:

LPDIRECT3DINDEXBUFFER9 g_pIndexBuffer = NULL;            //索引缓存    //创建索引缓存if(FAILED(g_pd3dDevice->CreateIndexBuffer(6 * sizeof(WORD),D3DUSAGE_WRITEONLY,D3DFMT_INDEX16,D3DPOOL_MANAGED,&g_pIndexBuffer,0))){    return E_FAIL;}

访问索引缓存:

WORD * indices = 0;g_pIndexBuffer->Lock(0,0,(void**)&indices,0);//第一个三角形由0,1,3顶点组成indices[0] = 0;indices[1] = 1;indices[2] = 3;    //第二个三角形由1,2,3顶点组成indices[3] = 1;indices[4] = 2;indices[5] = 3;g_pIndexBuffer->Unlock();

绘制图形:

g_pd3dDevice->SetStreamSource(0,g_pVertexBuffer,0,sizeof(CUSTOMVERTEX));        //设置绘制的顶点数据g_pd3dDevice->SetIndices(g_pIndexBuffer);                                       //设置索引缓存g_pd3dDevice->SetFVF(D3DFVF_CUSTOMVERTEX);                                      //设置灵活顶点格式g_pd3dDevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST,0,0,4,0,2);               //根据索引绘制图形,4代表使用4个顶点,2代表两个三角形,其他查询API了解吧

效果图:

全部代码:

#include 
     
      #include 
      
       #include 
       
        #pragma comment(lib,"winmm.lib")#pragma comment(lib,"d3d9.lib")#pragma comment(lib,"d3dx9.lib")#define WINDOW_WIDTH 800#define WINDOW_HEIGHT 600#define WINDOW_TITLE L"盘子脸的程序"#define SAFE_RELEASE(p) { if(p) { (p) -> Release();(p)=NULL;} }struct  CUSTOMVERTEX{    float x,y,z,rhw;    DWORD color;};#define D3DFVF_CUSTOMVERTEX (D3DFVF_XYZRHW | D3DFVF_DIFFUSE) //声明变量LPDIRECT3DDEVICE9 g_pd3dDevice = NULL;ID3DXFont* g_pFont = NULL;                    float g_FPS = 0.0f;wchar_t g_strFPS[50];                                    //包含帧速率的字符LPDIRECT3DVERTEXBUFFER9 g_pVertexBuffer = NULL;            //顶点缓冲区对象LPDIRECT3DINDEXBUFFER9 g_pIndexBuffer = NULL;            //索引缓存//全局函数声明部分LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam);HRESULT Direct3DInit(HWND hwnd);HRESULT ObjectsInit(HWND hwnd);VOID Direct3DRender(HWND hwnd);VOID Direct3DCleanUp();//主函数int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nShowCmd){    //设置一个完整的窗口类,没有设置图标    WNDCLASSEX wndClass = {
   0};    wndClass.cbSize = sizeof(WNDCLASSEX);    wndClass.style = CS_HREDRAW | CS_VREDRAW;            //设置窗口样式    wndClass.lpfnWndProc = WndProc;    wndClass.cbClsExtra = 0;    wndClass.cbWndExtra = 0;    wndClass.hInstance = hInstance;    wndClass.hCursor = LoadCursor(NULL,IDC_ARROW);    wndClass.hbrBackground = (HBRUSH)GetStockObject(GRAY_BRUSH);    wndClass.lpszMenuName = NULL;    wndClass.lpszClassName = L"GameDevelop";    //注册窗口类    if(!RegisterClassEx(&wndClass))    {        return -1;    }    //正式创建窗口    HWND hwnd = CreateWindow(L"GameDevelop",WINDOW_TITLE,WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,CW_USEDEFAULT,WINDOW_WIDTH,        WINDOW_HEIGHT,NULL,NULL,hInstance,NULL);    //初始化Direct3D资源    if(!(S_OK == Direct3DInit(hwnd)))    {        MessageBox(hwnd,_T("初始化Direct3D失败"),_T("盘子脸的消息窗口"),0);    }    MoveWindow(hwnd,250,80,WINDOW_WIDTH,WINDOW_HEIGHT,true);    ShowWindow(hwnd,nShowCmd);    UpdateWindow(hwnd);    //消息循环过程    MSG msg = {
   0};            while(msg.message != WM_QUIT)    {        if(PeekMessage(&msg,0,0,0,PM_REMOVE))        {            TranslateMessage(&msg);            DispatchMessage(&msg);        }else        {            Direct3DRender(hwnd);        }    }    //窗口类的注销    UnregisterClass(L"GameDevelop",wndClass.hInstance);    return 0;}//消息处理函数LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam){    switch (message)    {    case WM_PAINT:        Direct3DRender(hwnd);        ValidateRect(hwnd,NULL);        break;    case WM_KEYDOWN:        if(wParam == VK_ESCAPE)        {            DestroyWindow(hwnd);        }        break;    case WM_DESTROY:        Direct3DCleanUp();                //失败Direct3D资源        PostQuitMessage(0);        break;    default:        return DefWindowProc(hwnd,message,wParam,lParam);    }    return 0;}HRESULT Direct3DInit(HWND hwnd){    //创建Direct3D接口对象    LPDIRECT3D9 pD3D = NULL;    if(NULL == (pD3D = Direct3DCreate9(D3D_SDK_VERSION)))    {        return E_FAIL;    }    //获取硬件消息    D3DCAPS9 caps;    int vp = 0;    if(FAILED(pD3D->GetDeviceCaps(D3DADAPTER_DEFAULT,D3DDEVTYPE_HAL,&caps)))    {        return E_FAIL;    }    if(caps.DevCaps & D3DDEVCAPS_HWTRANSFORMANDLIGHT)    {        //支出硬件顶点运算        vp = D3DCREATE_HARDWARE_VERTEXPROCESSING;    }    else    {        vp = D3DCREATE_SOFTWARE_VERTEXPROCESSING;    }    //填充Direct3Dpresent参数    D3DPRESENT_PARAMETERS d3dpp;    ZeroMemory(&d3dpp,sizeof(d3dpp));    d3dpp.BackBufferWidth = WINDOW_WIDTH;    d3dpp.BackBufferHeight = WINDOW_HEIGHT;    d3dpp.BackBufferFormat = D3DFMT_A8R8G8B8;    d3dpp.BackBufferCount = 1;    d3dpp.MultiSampleType = D3DMULTISAMPLE_NONE;    d3dpp.MultiSampleQuality = 0;    d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;    d3dpp.hDeviceWindow = hwnd;    d3dpp.Windowed = true;    d3dpp.EnableAutoDepthStencil = true;    d3dpp.AutoDepthStencilFormat = D3DFMT_D24S8;    d3dpp.Flags = 0;    d3dpp.FullScreen_RefreshRateInHz = 0;    d3dpp.PresentationInterval = D3DPRESENT_INTERVAL_IMMEDIATE;    //创建Direct3D设备接口    if(FAILED(pD3D->CreateDevice(D3DADAPTER_DEFAULT,D3DDEVTYPE_HAL,hwnd,vp,&d3dpp,&g_pd3dDevice)))    {        return E_FAIL;    }    SAFE_RELEASE(pD3D);    if(!(S_OK == ObjectsInit(hwnd)))    {        return E_FAIL;    }    return S_OK;}HRESULT ObjectsInit(HWND hwnd){    //创建字体    if(FAILED(D3DXCreateFont(g_pd3dDevice,36,0,0,1,false,DEFAULT_CHARSET,OUT_DEFAULT_PRECIS,DEFAULT_QUALITY,0,_T("微软雅黑"),&g_pFont)))    {        return E_FAIL;    }    //创建顶点缓存    if(FAILED(g_pd3dDevice->CreateVertexBuffer(4*sizeof(CUSTOMVERTEX),0,D3DFVF_CUSTOMVERTEX,D3DPOOL_DEFAULT,&g_pVertexBuffer,NULL)))    {        return E_FAIL;    }    //创建索引缓存    if(FAILED(g_pd3dDevice->CreateIndexBuffer(6 * sizeof(WORD),D3DUSAGE_WRITEONLY,D3DFMT_INDEX16,D3DPOOL_MANAGED,&g_pIndexBuffer,0)))    {        return E_FAIL;    }    //创建顶点数据    CUSTOMVERTEX vertices [] =     {        { 100.0f, 100.0f, 0.0f, 1.0f,  D3DCOLOR_XRGB(36, 45,0), },        { 300.0f, 400.0f, 0.0f, 1.0f,  D3DCOLOR_XRGB(255, 255, 255), },         { 500.0f, 100.0f, 0.0f, 1.0f,  D3DCOLOR_XRGB(0,44,0), },        { 300.0f, 100.0f, 0.0f, 1.0f,  D3DCOLOR_XRGB(0,0,0), },    };    //填充顶点缓冲区    VOID *pVertices;    if(FAILED(g_pVertexBuffer->Lock(0,sizeof(vertices),(void**)&pVertices,0)))        //加锁    {        return E_FAIL;    }    memcpy(pVertices,vertices,sizeof(vertices));        //把顶点数据保存到顶点缓存中    g_pVertexBuffer->Unlock();                            //解锁    //这是索引缓存数据    WORD * indices = 0;    g_pIndexBuffer->Lock(0,0,(void**)&indices,0);    indices[0] = 0;    indices[1] = 1;    indices[2] = 3;        indices[3] = 1;    indices[4] = 2;    indices[5] = 3;    g_pIndexBuffer->Unlock();    g_pd3dDevice->SetRenderState(D3DRS_CULLMODE,false);    return S_OK;}void Direct3DRender(HWND hwnd){    g_pd3dDevice->Clear(0,NULL,D3DCLEAR_TARGET,D3DCOLOR_XRGB(0,0,0),1.0f,0);        //定义一个矩形    RECT formatRect;    GetClientRect(hwnd,&formatRect);    g_pd3dDevice->BeginScene();    g_pd3dDevice->SetRenderState(D3DRS_SHADEMODE,D3DSHADE_GOURAUD);    //绘制图形    g_pd3dDevice->SetStreamSource(0,g_pVertexBuffer,0,sizeof(CUSTOMVERTEX));        //设置绘制的顶点数据    g_pd3dDevice->SetIndices(g_pIndexBuffer);    g_pd3dDevice->SetFVF(D3DFVF_CUSTOMVERTEX);                                        //设置灵活顶点格式    //g_pd3dDevice->DrawPrimitive(D3DPT_TRIANGLELIST,0,1);        g_pd3dDevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST,0,0,4,0,2);    //绘制文本信息    g_pFont->DrawTextW(NULL,L"盘子脸",3,&formatRect,DT_TOP | DT_RIGHT , D3DCOLOR_XRGB(255,39,136));    g_pd3dDevice->EndScene();    g_pd3dDevice->Present(NULL,NULL,NULL,NULL);}void Direct3DCleanUp(){    SAFE_RELEASE(g_pVertexBuffer);    SAFE_RELEASE(g_pFont);    SAFE_RELEASE(g_pd3dDevice);}

转载于:https://www.cnblogs.com/plateFace/p/4967883.html

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