/// <summary>
/// Creates the OpenGL contexts.
/// </summary>
public void InitializeContexts()
{
int pixelFormat; // Holds the selected pixel format
windowHandle = this.Handle; // Get window handle
if (windowHandle == IntPtr.Zero) // No window handle means something is wrong
{
MessageBox.Show("Window creation error. No window handle.", "Fatal Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
Environment.Exit(-1);
}
Gdi.PIXELFORMATDESCRIPTOR pfd = new Gdi.PIXELFORMATDESCRIPTOR(); // The pixel format descriptor
pfd.nSize = (short)Marshal.SizeOf(pfd); // Size of the pixel format descriptor
pfd.nVersion = 1; // Version number (always 1)
pfd.dwFlags = Gdi.PFD_DRAW_TO_WINDOW | // Format must support windowed mode
Gdi.PFD_SUPPORT_OPENGL | // Format must support OpenGL
Gdi.PFD_DOUBLEBUFFER; // Must support double buffering
pfd.iPixelType = (byte)Gdi.PFD_TYPE_RGBA; // Request an RGBA format
pfd.cColorBits = (byte)colorBits; // Select our color depth
pfd.cRedBits = 0; // Individual color bits ignored
pfd.cRedShift = 0;
pfd.cGreenBits = 0;
pfd.cGreenShift = 0;
pfd.cBlueBits = 0;
pfd.cBlueShift = 0;
pfd.cAlphaBits = 0; // No alpha buffer
pfd.cAlphaShift = 0; // Alpha shift bit ignored
pfd.cAccumBits = accumBits; // Accumulation buffer
pfd.cAccumRedBits = 0; // Individual accumulation bits ignored
pfd.cAccumGreenBits = 0;
pfd.cAccumBlueBits = 0;
pfd.cAccumAlphaBits = 0;
pfd.cDepthBits = depthBits; // Z-buffer (depth buffer)
pfd.cStencilBits = stencilBits; // No stencil buffer
pfd.cAuxBuffers = 0; // No auxiliary buffer
pfd.iLayerType = (byte)Gdi.PFD_MAIN_PLANE; // Main drawing layer
pfd.bReserved = 0; // Reserved
pfd.dwLayerMask = 0; // Layer masks ignored
pfd.dwVisibleMask = 0;
pfd.dwDamageMask = 0;
deviceContext = User.GetDC(windowHandle); // Attempt to get the device context
if (deviceContext == IntPtr.Zero) // Did we not get a device context?
{
MessageBox.Show("Can not create a GL device context.", "Fatal Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
Environment.Exit(-1);
}
pixelFormat = Gdi.ChoosePixelFormat(deviceContext, ref pfd); // Attempt to find an appropriate pixel format
if (pixelFormat == 0) // Did windows not find a matching pixel format?
{
MessageBox.Show("Can not find a suitable PixelFormat.", "Fatal Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
Environment.Exit(-1);
}
if (!Gdi.SetPixelFormat(deviceContext, pixelFormat, ref pfd)) // Are we not able to set the pixel format?
{
MessageBox.Show("Can not set the chosen PixelFormat. Chosen PixelFormat was " + pixelFormat + ".", "Fatal Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
Environment.Exit(-1);
}
renderingContext = Wgl.wglCreateContext(deviceContext); // Attempt to get the rendering context
if (renderingContext == IntPtr.Zero) // Are we not able to get a rendering context?
{
MessageBox.Show("Can not create a GL rendering context.", "Fatal Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
Environment.Exit(-1);
}
MakeCurrent(); // Attempt to activate the rendering context
// Force A Reset On The Working Set Size
Kernel.SetProcessWorkingSetSize(Process.GetCurrentProcess().Handle, -1, -1);
}