- [directx]手工创建纹理并手工填充颜色

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[directx]手工创建纹理并手工填充颜色

clq

浏览(0) + 2010-08-11 13:01:15 发表编辑

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我对这个不熟,代码来自网上的七拼八凑.不过网上确实没有直接的代码,两个 for 循环的位置让我很迷惑,不是 i,j 顺序而是 j,i 顺序,我在操作 opencv 的图像时也发现有这个问题,奇怪原理何在?

///-------------------------------------
///创建纹理
///-------------------------------------
void GraphEngine::CreateGTexture()
{

   //D3DXCreateTextureFromFile(DXUTGetD3DDevice(), (L"Direct3D_2D7.jpg"), &g_Texture);return;

   //--------------------------------------------------
   int width = 100;
   int height = 100;
   //D3DXCreateTexture(device, width, height, 1, 0, D3DFMT_DXT1, D3DPOOL_SYSTEMMEM, &texture);
   Texture texture;
   HRESULT hr = 0;
   //hr = D3DXCreateTexture(DXUTGetD3DDevice(), 200, 200, 0, 0, D3DFMT_A8L8, D3DPOOL_MANAGED, &texture);
   //hr = D3DXCreateTexture(DXUTGetD3DDevice(), 1024, 1024, 0, 0, D3DFMT_R8G8B8, D3DPOOL_SYSTEMMEM, &texture);
   //hr = D3DXCreateTexture(DXUTGetD3DDevice(), 1024, 1024, 0, 0, D3DFMT_A8R8G8B8/*D3DFMT_R8G8B8*/, D3DPOOL_SYSTEMMEM, &texture);
   hr = D3DXCreateTexture(DXUTGetD3DDevice(), width, height, 0, 0, D3DFMT_R8G8B8, D3DPOOL_MANAGED, &texture);

   if(FAILED(hr))
   {
       return;
   }

   Texture _tex;
   //_tex = TexturePool[whichone];
   _tex = texture;

   int t = _tex->Format;
   printf("%d\r\n", t);

   D3DLOCKED_RECT lockedRect;
   _tex->LockRect(0, &lockedRect,0, 0);//D3DPOOL_DEFAULT 创建的在显存中不能 lock
   //使用类型要对应(unsigned short --- D3DFMT_A8L8)
   unsigned char* imageData = (unsigned char*)lockedRect.pBits;

   //D3DCOLOR* pColor = (D3DCOLOR*)lockedRect.pBits;
   unsigned char* pColor = (unsigned char*)lockedRect.pBits;

   //for (int i=0; i<_tex->Width; i++)
   for (int row=0; row<width; row++)
   {
       //for (int j=0; j<_tex->Height; j++)
       for (int col=0; col<height; col++)
       {
           //int index = i * lockedRect.Pitch /3/*D3DFMT_A8L8 二字节*/+ j;
           //imageData[index] = 0x0000ff;
           //int index = i*200*3 + j*3;
           //int index = i * lockedRect.Pitch + j*3;
           //unsigned char * p = &imageData[index];
           //p[0] = 0;
           //p[1] = 0;
           //p[2] = 200;

           //int index = i * lockedRect.Pitch/4 + j;
           //int index = i * lockedRect.Pitch + j*3;//D3DFMT_R8G8B8 一样是每个像素占 4 个字节，可能是为了字节对齐
           //int index = i * lockedRect.Pitch + j*4;
           int index = col* lockedRect.Pitch + row*4;
            //pColor[index] = D3DCOLOR_XRGB(0xff,0,0);

           unsigned char * p = (unsigned char *)(&pColor[index]);
           p[0] = 0;//b
           p[1] = 0;//g
           p[2] = 0xff;//r
           //p[3] = 0xff;//r

       }
   }

   _tex->UnlockRect(0);

   D3DXSaveTextureToFileA("c:\\1.jpg", D3DXIFF_JPG, _tex, NULL);

   g_Texture = _tex;

}

clq

2010-8-11 14:08:59 发表编辑

要注意的是每个像素的大小,d3d 会改动它的.

--------------------------------------------------
http://topic.csdn.net/u/20090909/21/2cf1f92b-cebf-427c-b0e9-0a900ab1fd52.html

Pitch大小不等于每行的字节数（1280*3），那它的用途在什么地方呢

是等于每行字节数阿，一行2048个像素，每个像素4字节。
因为D3DXCreateTexture函数把你的纹理从1280扩充到了2048

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