用Directx 3D画三角形!

lihuijie

作者：HuiHui

本节主要的目的就是要学习如何在D3D中画一个三角形，主要用到渲染方面的知识，下面我就直接给出源代码：



#include <d3d8.h>

#include <D3dx8math.h>



LPDIRECT3D8                  g_pD3D=NULL;

LPDIRECT3DDEVICE8            g_pD3DDevice=NULL;

LPDIRECT3DVERTEXBUFFER8      g_pVertextBuffer=NULL;



HWND hWnd;

HINSTANCE  hInstance;





struct  CUSTOMVERTEX

{

  D3DXVECTOR3  position;

  D3DCOLOR      color;

};

                                             



#define    SafeRelease(pObject)    if(pObject!=NULL) {pObject->Release();pObject=NULL;}

#define    D3DFVF_CUSTOMVER        (D3DFVF_XYZ|D3DFVF_DIFFUSE)



//Function  Declaration

LRESULT WINAPI WinProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);

bool  CreatWindow();

HRESULT InitialD3D(HWND hWnd);

HRESULT InitialVB();

void Render();

void CleanUp();

void GameLoop();







//Application entry point

INT WINAPI WinMain(HINSTANCE hInst, HINSTANCE, LPSTR, INT)

{

     

   if(!CreatWindow())

   {

        return false;

   }

    //Initialize Direct3D

    if(SUCCEEDED(InitialD3D(hWnd)))

    {  

        //Initialize Vertex Buffer

         if(SUCCEEDED(InitialVB()))

         {

             ShowWindow(hWnd, SW_SHOWDEFAULT);

             UpdateWindow(hWnd);         

              //Start game running: Enter the game loop

              GameLoop();

         }

    }

   

    CleanUp();



    UnregisterClass("HUIHUI WorkGroup2", hInstance);

   

    return 0;

}







//The windows message handler

LRESULT WINAPI WinProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)

{

    switch(msg)

    {

        case WM_DESTROY:

            PostQuitMessage(0);

            return 0;      



        case WM_KEYUP:

           if (wParam==VK_ESCAPE)

            {

                    //User has pressed the escape key, so quit

                    DestroyWindow(hWnd);               

            }



            return 0;

    }



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

}





bool  CreatWindow()

{   

    //Register the window class

   WNDCLASSEX wc = {sizeof(WNDCLASSEX), CS_CLASSDC, WinProc, 0L, 0L,

                     GetModuleHandle(NULL), NULL, NULL, NULL, NULL,

                     "HUIHUI WorkGroup2", NULL};

    if(!RegisterClassEx(&wc))

     {

       MessageBox(NULL,"Register  Window  Error!","ERROR!",MB_OK);

       return false;

      

     }



    //Create the application's window

     hWnd = CreateWindow("HUIHUI WorkGroup2", "HUIHUI WorkGroup: routine 2",

                              WS_OVERLAPPEDWINDOW, 50, 50, 500, 500,

                              GetDesktopWindow(), NULL, wc.hInstance, NULL);

     

     return true;



}

//initialiseD3D

HRESULT InitialD3D(HWND hWnd)

{  

  g_pD3D=Direct3DCreate8(D3D_SDK_VERSION);

  if(g_pD3D==NULL)

  {   

       return E_FAIL;

  }

  

  D3DDISPLAYMODE   d3ddm;

  if(FAILED(g_pD3D->GetAdapterDisplayMode(D3DADAPTER_DEFAULT, &d3ddm)))

    {

        return E_FAIL;

    }



  D3DPRESENT_PARAMETERS d3dpp;

  ZeroMemory(&d3dpp,sizeof(d3dpp));



  d3dpp.Windowed=TRUE;

  d3dpp.SwapEffect=D3DSWAPEFFECT_DISCARD;

  d3dpp.BackBufferFormat=d3ddm.Format;



  if(FAILED(g_pD3D->CreateDevice(D3DADAPTER_DEFAULT,D3DDEVTYPE_HAL,hWnd,

                                  D3DCREATE_SOFTWARE_VERTEXPROCESSING,&d3dpp,

                                      &g_pD3DDevice)))

       return E_FAIL;



     g_pD3DDevice->SetRenderState( D3DRS_CULLMODE, D3DCULL_NONE );



     // turn off light

     g_pD3DDevice->SetRenderState( D3DRS_LIGHTING, FALSE );



  return  S_OK;

        

}





HRESULT InitialVB()

{

     CUSTOMVERTEX * pVertices;



     //Create the vertex buffer from our device

     if(FAILED(g_pD3DDevice->CreateVertexBuffer(3* sizeof(CUSTOMVERTEX),

                                               0,  D3DFVF_CUSTOMVER ,

                                               D3DPOOL_DEFAULT, &g_pVertextBuffer)))

     {

         return E_FAIL;

     }



     //Get a pointer to the vertex buffer vertices and lock the vertex buffer

     if(FAILED(g_pVertextBuffer->Lock(0, 0, (BYTE **)&pVertices, 0)))

     {

         return E_FAIL;

     }



     //Copy our stored vertices values into the vertex buffer



     pVertices[0].position=D3DXVECTOR3(-1.0f,-1.0f, 0.0f);

     pVertices[0].color=D3DCOLOR_XRGB(255,0,0);



     pVertices[1].position=D3DXVECTOR3(1.0f,-1.0f, 0.0f);

     pVertices[1].color=D3DCOLOR_XRGB(0,255,0);



     pVertices[2].position=D3DXVECTOR3( 0.0f, 1.0f, 0.0f);

     pVertices[2].color=D3DCOLOR_XRGB(0,0,255);





     //Unlock the vertex buffer

     g_pVertextBuffer->Unlock();



    return S_OK;

}





void Render()

{

    if(g_pD3DDevice == NULL)

    {

        return;

    }



    //Clear the backbuffer to black

    g_pD3DDevice->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0,0, 0), 1.0f, 0);

   

    //Begin the scene

    g_pD3DDevice->BeginScene();

   



    //Rendering our triangle

     g_pD3DDevice->SetStreamSource(0, g_pVertextBuffer, sizeof(CUSTOMVERTEX));

     g_pD3DDevice->SetVertexShader( D3DFVF_CUSTOMVER );

     g_pD3DDevice->DrawPrimitive(D3DPT_TRIANGLELIST, 0, 1);





    //End the scene

    g_pD3DDevice->EndScene();

   

    //Filp the back and front buffers so that whatever has been rendered on the back buffer

    //will now be visible on screen (front buffer).

    g_pD3DDevice-&gtresent(NULL, NULL, NULL, NULL);

}





void CleanUp()

{

     SafeRelease(g_pVertextBuffer);

     SafeRelease(g_pD3DDevice);

     SafeRelease(g_pD3D);

}



void GameLoop()

{

    //Enter the game loop

    MSG msg;

    BOOL fMessage;



    PeekMessage(&msg, NULL, 0U, 0U, PM_NOREMOVE);

   

    while(msg.message != WM_QUIT)

    {

        fMessage = PeekMessage(&msg, NULL, 0U, 0U, PM_REMOVE);



        if(fMessage)

        {

            //Process message

            TranslateMessage(&msg);

            DispatchMessage(&msg);

        }

        else

        {

            //No message to process, so render the current scene

            Render();

        }



    }

}

效果图是：


在本文本中，你可以注意到我已经没有在每行代码后面作注释了，因为那样的编程风格是不好的，至少我认为是那样的，呵呵！＊注：本程序中还要在Project－＞Setting－＞Link的　L object/Module中加入：d3d8.lib、dxguid.lib文件,因为这样不会出现连接错误，不信！你试试看吧！呵呵！因为我写的文章很少，有什么不好的地方请给我留言，我一定会看的。下次见，拜拜！！！！(本文出自HuiHui WorkGruop)