D3D 部分功能测试结论

　　写了个测试程序，方便个人在使用中查询，不当之处请指出（以下结论均为三角形数为20000，一个批次中完成渲染）

1 在三角形数量不超过20000时，DrawIndexedPrimitive和DrawIndexedPrimitiveUP效率没有明显差别，
  前提是创建buffer时没有使用D3DUSAGE_DYNAMIC，否则DrawIndexedPrimitive的性能不如DrawIndexedPrimitiveUP
2 创建buffer时，如果D3DUSAGE使用的是0，DrawIndexedPrimitive的性能不如DrawIndexedPrimitiveUP,
  而且0和D3DUSAGE_WRITEONLY在三角形数量为20000时，性能差别比较大（差不多有100帧的差距）
3 尽量不要使用DrawPrimitive和DrawPrimitiveUP，尤其是DrawPrimitiveUP，效率比起前面两个函数，差很多
4 使用DrawIndexedPrimitive和DrawIndexedPrimitiveUP两个函数测试D3DPOOL_DEFAULT，D3DPOOL_MANAGED，
  D3DPOOL_SYSTEMMEM。发现D3DPOOL_DEFAULT，D3DPOOL_MANAGED的效率差不多，D3DPOOL_DEFAULT表现稍好。
  当使用D3DPOOL_SYSTEMMEM时，效率相对前面两个参数，DrawIndexedPrimitive有明显下降。
  而DrawIndexedPrimitiveUP的速度稍有下降，而且DrawIndexedPrimitiveUP比DrawIndexedPrimitive要快

以下是测试程序：


代码
#include <d3dx9.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_Index  = NULL;    //顶点缓冲区对象
LPDIRECT3DINDEXBUFFER9  g_pIB_Index  = NULL;
LPDIRECT3DVERTEXBUFFER9 g_pVB        = NULL;    //顶点缓冲区对象
LPDIRECT3DINDEXBUFFER9  g_pIB        = NULL;
//-----------------------------------------------------------------------------
// Desc: 顶点结构
//-----------------------------------------------------------------------------
struct CUSTOMVERTEX
{
    FLOAT x, y, z;    //顶点位置  
    DWORD diffuse;

//public:
//    CUSTOMVERTEX():diffuse(0xffffffff){}
};
#define D3DFVF_CUSTOMVERTEX   (D3DFVF_XYZ|D3DFVF_DIFFUSE)


const int g_edgeVertexCnts = 101;  //每边顶点数目
CUSTOMVERTEX *g_pVertex_Index;     //顶点
int *g_pIndexes_Index;             //索引

CUSTOMVERTEX *g_pVertex;           //顶点
//-----------------------------------------------------------------------------
// Desc: 渲染类型
//-----------------------------------------------------------------------------
enum Draw_Prim_Type
{
    DPT_INDEX = 0,//drawindexedprimitive
    DPT_INDEX_UP, //drawindexedprimitiveup
    DPT_PRIM,     //drawprimitive
    DPT_PRIM_UP,  //drawprimitiveup
};
Draw_Prim_Type g_kDrawType = DPT_INDEX;

//-----------------------------------------------------------------------------
// Desc: 设置变换矩阵
//-----------------------------------------------------------------------------
VOID SetupMatrices()
{
    D3DXMATRIX matWorld;
    D3DXMatrixIdentity(&matWorld);
    g_pd3dDevice->SetTransform(D3DTS_WORLD,&matWorld);

    D3DXMATRIX matView;
    D3DXVECTOR3 vecEyeat(0,100,-100);
    D3DXVECTOR3 vecLookat(0,0,10);
    D3DXVECTOR3 vecUp(0,1,0);
    D3DXMatrixLookAtLH(&matView, &vecEyeat, &vecLookat, &vecUp);
    g_pd3dDevice->SetTransform(D3DTS_VIEW, &matView);

    D3DXMATRIX matProj;
    D3DXMatrixPerspectiveFovLH(&matProj, D3DX_PI/2, 4.0f/3.0f, 1.0f, 1000.0f);
    g_pd3dDevice->SetTransform(D3DTS_PROJECTION, &matProj);
}


//-----------------------------------------------------------------------------
// Desc: 初始化Direct3D
//-----------------------------------------------------------------------------
HRESULT InitD3D( HWND hWnd )
{
    //创建d3d对象
    g_pD3D = Direct3DCreate9(D3D_SDK_VERSION);

    //初始化设置参数
    D3DPRESENT_PARAMETERS parm;
    ZeroMemory(&parm, sizeof(D3DPRESENT_PARAMETERS));
    parm.BackBufferWidth = 800;
    parm.BackBufferHeight = 600;
    parm.BackBufferCount = 2;
    parm.BackBufferFormat = D3DFMT_UNKNOWN;
    parm.MultiSampleType = D3DMULTISAMPLE_NONE;
    parm.SwapEffect = D3DSWAPEFFECT_DISCARD;
    parm.Windowed = true;
    parm.hDeviceWindow = hWnd;
    parm.EnableAutoDepthStencil = false;
    parm.PresentationInterval = D3DPRESENT_INTERVAL_IMMEDIATE;

    //创建设备
    HRESULT hr = g_pD3D->CreateDevice(D3DADAPTER_DEFAULT,D3DDEVTYPE_HAL,hWnd,
        D3DCREATE_HARDWARE_VERTEXPROCESSING, &parm, &g_pd3dDevice);
    if (FAILED(hr))
    {
        return S_FALSE;
    }

    //禁用light
    g_pd3dDevice->SetRenderState(D3DRS_LIGHTING, false);
    g_pd3dDevice->SetRenderState(D3DRS_FILLMODE, D3DFILL_SOLID);

    SetupMatrices();

    return S_OK;
}


//-----------------------------------------------------------------------------
// Desc: 创建场景图形
//-----------------------------------------------------------------------------
HRESULT InitGriphics()
{
    //--------------vertex buffer for index
    const float fGridLenth = 0.10f;
    g_pVertex_Index = new CUSTOMVERTEX[g_edgeVertexCnts * g_edgeVertexCnts];

    for (int j = 0; j < g_edgeVertexCnts; j+=1)
    {
        for (int i = 0; i < g_edgeVertexCnts; i+=1)
        {
            g_pVertex_Index[j * g_edgeVertexCnts + i].x = fGridLenth * i;
            g_pVertex_Index[j * g_edgeVertexCnts + i].y = 0;
            g_pVertex_Index[j * g_edgeVertexCnts + i].z = 0.5f*fGridLenth*(g_edgeVertexCnts-1) - fGridLenth * j;
        }
    }

    HRESULT hr = g_pd3dDevice->CreateVertexBuffer(
        g_edgeVertexCnts * g_edgeVertexCnts*sizeof(CUSTOMVERTEX),
        D3DUSAGE_WRITEONLY,//非常影响新能
        D3DFVF_CUSTOMVERTEX,
        D3DPOOL_DEFAULT,
        &g_pVB_Index,
        NULL);
    if (FAILED(hr))
    {
        return S_FALSE;
    }

    //写入数据
    void *pData;
    g_pVB_Index->Lock(0, g_edgeVertexCnts * g_edgeVertexCnts*sizeof(CUSTOMVERTEX), (void**)&pData, D3DLOCK_DISCARD);
    memcpy(pData, g_pVertex_Index, g_edgeVertexCnts * g_edgeVertexCnts*sizeof(CUSTOMVERTEX));
    g_pVB_Index->Unlock();


    //--------------index buffer for index
    int iIndexCount = (g_edgeVertexCnts-1) * (g_edgeVertexCnts-1) * 6;
    g_pIndexes_Index = new int[iIndexCount];

    for(int j=0;j<g_edgeVertexCnts-1;j+=1)
    {
        for(int i=0;i<g_edgeVertexCnts-1;i+=1)
        {
            g_pIndexes_Index[j*(g_edgeVertexCnts-1)*6+i*6+0] =(int)(j*g_edgeVertexCnts+i);
            g_pIndexes_Index[j*(g_edgeVertexCnts-1)*6+i*6+1] =(int)(j*g_edgeVertexCnts+i+g_edgeVertexCnts+1);
            g_pIndexes_Index[j*(g_edgeVertexCnts-1)*6+i*6+2] =(int)(j*g_edgeVertexCnts+i+g_edgeVertexCnts);
            g_pIndexes_Index[j*(g_edgeVertexCnts-1)*6+i*6+3] =(int)(j*g_edgeVertexCnts+i);
            g_pIndexes_Index[j*(g_edgeVertexCnts-1)*6+i*6+4] =(int)(j*g_edgeVertexCnts+i+1);
            g_pIndexes_Index[j*(g_edgeVertexCnts-1)*6+i*6+5] =(int)(j*g_edgeVertexCnts+i+g_edgeVertexCnts+1);
        }
    }

    g_pd3dDevice->CreateIndexBuffer(iIndexCount*sizeof(int), 
        D3DUSAGE_WRITEONLY,
        D3DFMT_INDEX32,
        D3DPOOL_DEFAULT,
        &g_pIB_Index,
        NULL);
    void *pp;
    if(FAILED(g_pIB_Index->Lock(0, iIndexCount*sizeof(int), (void**)&pp, 0)))
    {
        //add code
        return S_FALSE;
    }
    memcpy(pp, g_pIndexes_Index, iIndexCount*sizeof(int));
    g_pIB_Index->Unlock();

    //--------------vertex buffer
    int prim_list_vertex_cnts = (g_edgeVertexCnts-1)*(g_edgeVertexCnts-1)*6;
    g_pVertex = new CUSTOMVERTEX[prim_list_vertex_cnts];

    for (int j = 0; j < g_edgeVertexCnts-1; j+=1)
    {
        for (int i = 0; i < g_edgeVertexCnts-1; i+=1)
        {
            g_pVertex[j*(g_edgeVertexCnts-1)*6+i*6+0].x = i*fGridLenth;
            g_pVertex[j*(g_edgeVertexCnts-1)*6+i*6+0].y = 0;
            g_pVertex[j*(g_edgeVertexCnts-1)*6+i*6+0].z = 0.5f*fGridLenth*(g_edgeVertexCnts-1)-j*fGridLenth;
            g_pVertex[j*(g_edgeVertexCnts-1)*6+i*6+1].x = (i+1)*fGridLenth;
            g_pVertex[j*(g_edgeVertexCnts-1)*6+i*6+1].y = 0;
            g_pVertex[j*(g_edgeVertexCnts-1)*6+i*6+1].z = 0.5f*fGridLenth*(g_edgeVertexCnts-1)-j*fGridLenth;
            g_pVertex[j*(g_edgeVertexCnts-1)*6+i*6+2].x = (i+1)*fGridLenth;
            g_pVertex[j*(g_edgeVertexCnts-1)*6+i*6+2].y = 0;
            g_pVertex[j*(g_edgeVertexCnts-1)*6+i*6+2].z = 0.5f*fGridLenth*(g_edgeVertexCnts-1)-(j+1)*fGridLenth;
            g_pVertex[j*(g_edgeVertexCnts-1)*6+i*6+3].x = i*fGridLenth;
            g_pVertex[j*(g_edgeVertexCnts-1)*6+i*6+3].y = 0;
            g_pVertex[j*(g_edgeVertexCnts-1)*6+i*6+3].z = 0.5f*fGridLenth*(g_edgeVertexCnts-1)-j*fGridLenth;
            g_pVertex[j*(g_edgeVertexCnts-1)*6+i*6+4].x = (i+1)*fGridLenth;
            g_pVertex[j*(g_edgeVertexCnts-1)*6+i*6+4].y = 0;
            g_pVertex[j*(g_edgeVertexCnts-1)*6+i*6+4].z = 0.5f*fGridLenth*(g_edgeVertexCnts-1)-(j+1)*fGridLenth;
            g_pVertex[j*(g_edgeVertexCnts-1)*6+i*6+5].x = i*fGridLenth;
            g_pVertex[j*(g_edgeVertexCnts-1)*6+i*6+5].y = 0;
            g_pVertex[j*(g_edgeVertexCnts-1)*6+i*6+5].z = 0.5f*fGridLenth*(g_edgeVertexCnts-1)-(j+1)*fGridLenth;
        }
    }

    if( FAILED( g_pd3dDevice->CreateVertexBuffer( 
        prim_list_vertex_cnts*sizeof(CUSTOMVERTEX),
        D3DUSAGE_WRITEONLY, 
        D3DFVF_CUSTOMVERTEX,
        D3DPOOL_DEFAULT, 
        &g_pVB,
        NULL ) ) )
    {
        return E_FAIL;
    }

    VOID* pVertices;
    if( FAILED( g_pVB->Lock( 0, prim_list_vertex_cnts*sizeof(CUSTOMVERTEX), (void**)&pVertices, 0 ) ) )
        return E_FAIL;
    memcpy( pVertices, g_pVertex, prim_list_vertex_cnts*sizeof(CUSTOMVERTEX) );
    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_Index != NULL )        
        g_pVB_Index->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()
{
    g_pd3dDevice->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0,0,255),1,0);

    g_pd3dDevice->BeginScene();

    g_pd3dDevice->SetFVF(D3DFVF_CUSTOMVERTEX);

    switch(g_kDrawType)
    {
    case  DPT_INDEX:
        g_pd3dDevice->SetStreamSource(0,g_pVB_Index,0,sizeof(CUSTOMVERTEX));
        g_pd3dDevice->SetIndices(g_pIB_Index);

        g_pd3dDevice->DrawIndexedPrimitive( D3DPT_TRIANGLELIST, 0, 0, 
            g_edgeVertexCnts*g_edgeVertexCnts, 0 ,
            (g_edgeVertexCnts-1)*(g_edgeVertexCnts-1) * 2);
        break;

    case  DPT_INDEX_UP:
        g_pd3dDevice->SetStreamSource(0,g_pVB_Index,0,sizeof(CUSTOMVERTEX));
        g_pd3dDevice->SetIndices(g_pIB_Index);

        g_pd3dDevice->DrawIndexedPrimitiveUP(D3DPT_TRIANGLELIST, 0, g_edgeVertexCnts*g_edgeVertexCnts, 
            (g_edgeVertexCnts-1)*(g_edgeVertexCnts-1) * 2, g_pIndexes_Index,
            D3DFMT_INDEX32, g_pVertex_Index, sizeof(CUSTOMVERTEX));
        break;

    case  DPT_PRIM:
        g_pd3dDevice->SetStreamSource(0,g_pVB,0,sizeof(CUSTOMVERTEX));

        g_pd3dDevice->DrawPrimitive(D3DPT_TRIANGLELIST, 0, (g_edgeVertexCnts-1)*(g_edgeVertexCnts-1) * 2);
        break;

    case  DPT_PRIM_UP:
        g_pd3dDevice->SetStreamSource(0,g_pVB,0,sizeof(CUSTOMVERTEX));

        g_pd3dDevice->DrawPrimitiveUP(D3DPT_TRIANGLELIST, (g_edgeVertexCnts-1)*(g_edgeVertexCnts-1) * 2,
            g_pVertex, sizeof(CUSTOMVERTEX));
        break;
    }

    g_pd3dDevice->EndScene();

    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 );

    case WM_KEYDOWN:
        {
            switch((WORD)wParam)
            {
            case 'W':
                g_pd3dDevice->SetRenderState(D3DRS_FILLMODE, D3DFILL_WIREFRAME);
                break;
            case 'S':
                g_pd3dDevice->SetRenderState(D3DRS_FILLMODE, D3DFILL_SOLID);
                break;

            case '1':
                g_kDrawType = DPT_INDEX;
                break;

            case '2':
                g_kDrawType = DPT_INDEX_UP;
                break;

            case '3':
                g_kDrawType = DPT_PRIM;
                break;

            case '4':
                g_kDrawType = DPT_PRIM_UP;
                break;

            case 'Q':
                exit(0);
                break;
            }
        }

        return 0;
    }

    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, 0L, 0L,
                      GetModuleHandle(NULL), NULL, NULL, NULL, NULL,
                       L"ClassName", NULL };
    RegisterClassEx( &wc );

    RECT rc;
    rc.left = 0;
    rc.top = 0;
    rc.right = 800;
    rc.bottom = 600;
    AdjustWindowRect(&rc,  WS_VISIBLE | WS_CLIPCHILDREN | WS_OVERLAPPEDWINDOW, false);
    //创建窗口
    HWND hWnd = CreateWindow(  L"ClassName", L"纹理影射基础",
                              WS_OVERLAPPEDWINDOW, 
                              200, 
                              100, 
                              rc.right-rc.left, 
                              rc.bottom-rc.top,
                              GetDesktopWindow(), NULL, wc.hInstance, NULL );

    //初始化Direct3D
    if( SUCCEEDED( InitD3D( hWnd ) ) )
    {
        //创建场景图形
        if( SUCCEEDED( InitGriphics() ) )
        {
            //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, 0U, 0U, PM_REMOVE ) )
                {
                    TranslateMessage( &msg );
                    DispatchMessage( &msg );
                }
                else
                {
                    Render();  //渲染图形
                }
            }
        }
    }

    UnregisterClass(  L"ClassName", wc.hInstance );
    return 0;
}
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原文地址：https://www.cnblogs.com/lancidie/p/1848847.html