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LPDIRECT3DTEXTURE9 m_pTexture;
// Create an alpha texture
D3DXCreateTexture(m_d3dDevice, 128, 128, 0, D3DUSAGE_RENDERTARGET,
D3DFMT_A8R8G8B8, D3DPOOL_MANAGED, &m_pTexture);
// Initialize the alpha channel
int yGrad, xGrad;
D3DLOCKED_RECT lockedRect;
if(SUCCEEDED(pTexture->LockRect(0, &lockedRect, NULL, D3DLOCK_DISCARD ))
{
m_pRGBAData = new DWORD[128*128];
if( m_pRGBAData != NULL )
{
for( DWORD y=0; y < m_dwHeight; y++ )
{
DWORD dwOffset = y*m_dwWidth;
yGrad = (int)(((float)y/(float)m_dwWidth) * 255.0f);
for( DWORD x=0; x < m_dwWidth; x )
{
xGrad = (int)(((float)x/(float)m_dwWidth) * 255.0f);
DWORD b = (DWORD)(xGrad + (255 - yGrad))/2 & 0xFF;
DWORD g = (DWORD)((255 - xGrad) + yGrad)/2 & 0xFF;
DWORD r = (DWORD)(xGrad + yGrad)/2 & 0xFF;
DWORD a = (DWORD)(xGrad + yGrad)/2 & 0xFF;
lockedRect.pBits[dwOffset+x] = ((a<<24L)+(r<<16L)+(g<<8L)+(b));
x++;
}
pTexture->UnlockRect(&lockedRect);
}
}
} |
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