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Anyone has simple samplecode for a directX cursor available?


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#1 lnd   Members   -  Reputation: 122

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Posted 16 June 2006 - 12:01 AM

Hi, i'm quite new to directX, could anyone post a sample program here that just displays a directX cursor loaded from for example a bitmap or so? Thanks in advance

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#2 exorcist_bob   Members   -  Reputation: 187

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Posted 16 June 2006 - 01:45 AM

If this helps any, here is the source on how to load a directx cursor from a HCURSOR, straight from the DXUT source:


//--------------------------------------------------------------------------------------
// Gives the D3D device a cursor with image and hotspot from hCursor.
//--------------------------------------------------------------------------------------
HRESULT DXUTSetDeviceCursor( IDirect3DDevice9* pd3dDevice, HCURSOR hCursor, bool bAddWatermark )
{
HRESULT hr = E_FAIL;
ICONINFO iconinfo;
bool bBWCursor;
LPDIRECT3DSURFACE9 pCursorSurface = NULL;
HDC hdcColor = NULL;
HDC hdcMask = NULL;
HDC hdcScreen = NULL;
BITMAP bm;
DWORD dwWidth;
DWORD dwHeightSrc;
DWORD dwHeightDest;
COLORREF crColor;
COLORREF crMask;
UINT x;
UINT y;
BITMAPINFO bmi;
COLORREF* pcrArrayColor = NULL;
COLORREF* pcrArrayMask = NULL;
DWORD* pBitmap;
HGDIOBJ hgdiobjOld;

ZeroMemory( &iconinfo, sizeof(iconinfo) );
if( !GetIconInfo( hCursor, &iconinfo ) )
goto End;

if (0 == GetObject((HGDIOBJ)iconinfo.hbmMask, sizeof(BITMAP), (LPVOID)&bm))
goto End;
dwWidth = bm.bmWidth;
dwHeightSrc = bm.bmHeight;

if( iconinfo.hbmColor == NULL )
{
bBWCursor = TRUE;
dwHeightDest = dwHeightSrc / 2;
}
else
{
bBWCursor = FALSE;
dwHeightDest = dwHeightSrc;
}

// Create a surface for the fullscreen cursor
if( FAILED( hr = pd3dDevice->CreateOffscreenPlainSurface( dwWidth, dwHeightDest,
D3DFMT_A8R8G8B8, D3DPOOL_SCRATCH, &pCursorSurface, NULL ) ) )
{
goto End;
}

pcrArrayMask = new DWORD[dwWidth * dwHeightSrc];

ZeroMemory(&bmi, sizeof(bmi));
bmi.bmiHeader.biSize = sizeof(bmi.bmiHeader);
bmi.bmiHeader.biWidth = dwWidth;
bmi.bmiHeader.biHeight = dwHeightSrc;
bmi.bmiHeader.biPlanes = 1;
bmi.bmiHeader.biBitCount = 32;
bmi.bmiHeader.biCompression = BI_RGB;

hdcScreen = GetDC( NULL );
hdcMask = CreateCompatibleDC( hdcScreen );
if( hdcMask == NULL )
{
hr = E_FAIL;
goto End;
}
hgdiobjOld = SelectObject(hdcMask, iconinfo.hbmMask);
GetDIBits(hdcMask, iconinfo.hbmMask, 0, dwHeightSrc,
pcrArrayMask, &bmi, DIB_RGB_COLORS);
SelectObject(hdcMask, hgdiobjOld);

if (!bBWCursor)
{
pcrArrayColor = new DWORD[dwWidth * dwHeightDest];
hdcColor = CreateCompatibleDC( hdcScreen );
if( hdcColor == NULL )
{
hr = E_FAIL;
goto End;
}
SelectObject(hdcColor, iconinfo.hbmColor);
GetDIBits(hdcColor, iconinfo.hbmColor, 0, dwHeightDest,
pcrArrayColor, &bmi, DIB_RGB_COLORS);
}

// Transfer cursor image into the surface
D3DLOCKED_RECT lr;
pCursorSurface->LockRect( &lr, NULL, 0 );
pBitmap = (DWORD*)lr.pBits;
for( y = 0; y < dwHeightDest; y++ )
{
for( x = 0; x < dwWidth; x++ )
{
if (bBWCursor)
{
crColor = pcrArrayMask[dwWidth*(dwHeightDest-1-y) + x];
crMask = pcrArrayMask[dwWidth*(dwHeightSrc-1-y) + x];
}
else
{
crColor = pcrArrayColor[dwWidth*(dwHeightDest-1-y) + x];
crMask = pcrArrayMask[dwWidth*(dwHeightDest-1-y) + x];
}
if (crMask == 0)
pBitmap[dwWidth*y + x] = 0xff000000 | crColor;
else
pBitmap[dwWidth*y + x] = 0x00000000;

// It may be helpful to make the D3D cursor look slightly
// different from the Windows cursor so you can distinguish
// between the two when developing/testing code. When
// bAddWatermark is TRUE, the following code adds some
// small grey "D3D" characters to the upper-left corner of
// the D3D cursor image.
if( bAddWatermark && x < 12 && y < 5 )
{
// 11.. 11.. 11.. .... CCC0
// 1.1. ..1. 1.1. .... A2A0
// 1.1. .1.. 1.1. .... A4A0
// 1.1. ..1. 1.1. .... A2A0
// 11.. 11.. 11.. .... CCC0

const WORD wMask[5] = { 0xccc0, 0xa2a0, 0xa4a0, 0xa2a0, 0xccc0 };
if( wMask[y] & (1 << (15 - x)) )
{
pBitmap[dwWidth*y + x] |= 0xff808080;
}
}
}
}
pCursorSurface->UnlockRect();

// Set the device cursor
if( FAILED( hr = pd3dDevice->SetCursorProperties( iconinfo.xHotspot,
iconinfo.yHotspot, pCursorSurface ) ) )
{
goto End;
}

hr = S_OK;

End:
if( iconinfo.hbmMask != NULL )
DeleteObject( iconinfo.hbmMask );
if( iconinfo.hbmColor != NULL )
DeleteObject( iconinfo.hbmColor );
if( hdcScreen != NULL )
ReleaseDC( NULL, hdcScreen );
if( hdcColor != NULL )
DeleteDC( hdcColor );
if( hdcMask != NULL )
DeleteDC( hdcMask );
SAFE_DELETE_ARRAY( pcrArrayColor );
SAFE_DELETE_ARRAY( pcrArrayMask );
SAFE_RELEASE( pCursorSurface );
return hr;
}



Hope this helps,
exorcist_bob

#3 streamer   Members   -  Reputation: 415

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Posted 16 June 2006 - 05:07 AM

you can do this:
1.load bitmap as texture (your cursor) and hide windows cursor at start

ShowCursor(false);


2. in WM_MOUSEMOVE handle mouse movement and set two global variables for mouse cordinates (ex:

POINT g_Mouse;

...
case WM_MOUSEMOVE:
g_Mouse.x = LOWORD (lParam);
g_Mouse.y = HIWORD (lParam);
break;


...

3. Use sprite to show your DX cursor.

D3DXVECTOR3 vPosition(0,0,0);
vPosition.x = (float)g_Mouse.x;
vPosition.y = (float)g_Mouse.y;
pSprite->Begin(D3DXSPRITE_ALPHABLEND );
pSprite->Draw( g_pCursor, 0, 0,&vPosition, 0xffffffff);
pSprite->End();





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