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/************************************************************************
Support code for handling various tasks under Win32
$Id: wintools.cxx 427 2004-09-27 04:45:31Z garland $
************************************************************************/
#include <gfx/win/wintools.h>
namespace gfx
{
HGLRC create_glcontext(HDC dc)
{
HGLRC context = wglCreateContext(dc);
if( context )
{
if( !wglMakeCurrent(dc, context) )
{
// Destroy context if it fails to bind
wglDeleteContext(context);
context = NULL;
}
}
return context;
}
int set_pixel_format(HDC dc)
{
PIXELFORMATDESCRIPTOR pixelDesc;
//
// These are the important fields of the PFD
//
pixelDesc.nSize = sizeof(PIXELFORMATDESCRIPTOR);
pixelDesc.nVersion = 1;
pixelDesc.dwFlags =
PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL |
PFD_DOUBLEBUFFER | PFD_STEREO_DONTCARE;
pixelDesc.iPixelType = PFD_TYPE_RGBA;
pixelDesc.cColorBits = 24;
pixelDesc.iLayerType = PFD_MAIN_PLANE;
//
// According to the docs, these can be/are ignored.
//
pixelDesc.cRedBits = 8;
pixelDesc.cRedShift = 16;
pixelDesc.cGreenBits = 8;
pixelDesc.cGreenShift = 8;
pixelDesc.cBlueBits = 8;
pixelDesc.cBlueShift = 0;
pixelDesc.cAlphaBits = 0;
pixelDesc.cAlphaShift = 0;
pixelDesc.cAccumBits = 0;
pixelDesc.cAccumRedBits = 0;
pixelDesc.cAccumGreenBits = 0;
pixelDesc.cAccumBlueBits = 0;
pixelDesc.cAccumAlphaBits = 0;
pixelDesc.cDepthBits = 32;
pixelDesc.cStencilBits = 0;
pixelDesc.cAuxBuffers = 0;
pixelDesc.bReserved = 0;
pixelDesc.dwLayerMask = 0;
pixelDesc.dwVisibleMask = 0;
pixelDesc.dwDamageMask = 0;
int pixel_format = ChoosePixelFormat(dc, &pixelDesc);
if( !pixel_format )
{
// Try and guess a decent default pixel format
pixel_format = 1;
if( !DescribePixelFormat(dc, pixel_format,
sizeof(PIXELFORMATDESCRIPTOR), &pixelDesc) )
return NULL;
}
if( !SetPixelFormat(dc, pixel_format, &pixelDesc) )
return NULL;
return pixel_format;
}
} // namespace gfx
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