static private int GetAAPixelFormat(ref int samples)
{
PIXELFORMATDESCRIPTOR pfd = new PIXELFORMATDESCRIPTOR();
pfd.nSize = (ushort)Marshal.SizeOf(typeof(PIXELFORMATDESCRIPTOR));
pfd.nVersion = 1;
pfd.dwFlags = PixelFlag.PFD_DRAW_TO_WINDOW | PixelFlag.PFD_SUPPORT_OPENGL | PixelFlag.PFD_DOUBLEBUFFER;
pfd.iPixelType = PixelType.PFD_TYPE_RGBA;
pfd.cColorBits = 32;
IntPtr dummyHWnd = GDI.CreateWindowEx(0, s_dummyClass, "", GDI.WindowStyles.WS_OVERLAPPEDWINDOW, 0, 0, 0, 0, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero);
IntPtr dummyHDc = GDI.GetDC(dummyHWnd);
int dummyPF = GDI.ChoosePixelFormat(dummyHDc, ref pfd);
GDI.SetPixelFormat(dummyHDc, dummyPF, ref pfd);
IntPtr dummyHRc = WGL.wglCreateContext(dummyHDc);
WGL.wglMakeCurrent(dummyHDc, dummyHRc);
int[] iattrs = new int[] {
WGL.WGL_DRAW_TO_WINDOW_ARB, 1,
WGL.WGL_ACCELERATION_ARB, WGL.WGL_FULL_ACCELERATION_ARB,
WGL.WGL_COLOR_BITS_ARB, 24,
WGL.WGL_ALPHA_BITS_ARB, 8,
WGL.WGL_DEPTH_BITS_ARB, 24,
WGL.WGL_STENCIL_BITS_ARB, 8,
WGL.WGL_DOUBLE_BUFFER_ARB, 1,
WGL.WGL_SAMPLE_BUFFERS_ARB, 1,
WGL.WGL_SAMPLES_ARB, 0,
0, 0
};
WGL.wglChoosePixelFormatARBHandler wglChoosePixelFormatARB = (WGL.wglChoosePixelFormatARBHandler)WGL.GetProc <WGL.wglChoosePixelFormatARBHandler>("wglChoosePixelFormatARB");
int pixelFormat = 0;
if (wglChoosePixelFormatARB != null)
{
int reqSamples;
for (reqSamples = samples; reqSamples > 0; reqSamples /= 2)
{
iattrs[17] = reqSamples;
int[] pixelFormats = new int[16];
int numFormats;
unsafe
{
fixed(int *pPixelFormats = pixelFormats)
{
fixed(int *pIAttrs = iattrs)
{
int success = wglChoosePixelFormatARB(
dummyHDc,
pIAttrs, (float *)0, 16,
pPixelFormats, &numFormats);
if (success != 0 && numFormats > 0)
{
pixelFormat = pixelFormats[0];
samples = reqSamples;
break;
}
}
}
}
}
}
else
{
samples = 1;
pixelFormat = GDI.ChoosePixelFormat(dummyHDc, ref pfd);
}
WGL.wglMakeCurrent(dummyHDc, dummyHRc);
WGL.wglDeleteContext(dummyHRc);
GDI.ReleaseDC(dummyHWnd, dummyHDc);
GDI.DestroyWindow(dummyHWnd);
return(pixelFormat);
}
protected void OnScroll(ScrollEventArgs se)
{
bool hasViewChanged = false;
if (se.ScrollOrientation == ScrollOrientation.HorizontalScroll)
{
GDI.SCROLLINFO si = new GDI.SCROLLINFO();
si.cbSize = System.Runtime.InteropServices.Marshal.SizeOf(typeof(GDI.SCROLLINFO));
si.fMask = (int)(GDI.ScrollInfoMask.SIF_TRACKPOS | GDI.ScrollInfoMask.SIF_PAGE | GDI.ScrollInfoMask.SIF_POS);
GDI.GetScrollInfo(Handle, (int)GDI.ScrollBarDirection.SB_HORZ, ref si);
switch (se.Type)
{
case ScrollEventType.LargeDecrement:
m_view = new RectD(m_view.Left - m_view.Width, m_view.Top, m_view.Right - m_view.Width, m_view.Bottom);
break;
case ScrollEventType.LargeIncrement:
m_view = new RectD(m_view.Left + m_view.Width, m_view.Top, m_view.Right + m_view.Width, m_view.Bottom);
break;
case ScrollEventType.SmallDecrement:
m_view = new RectD(m_view.Left - m_view.Width * 0.1f, m_view.Top, m_view.Right - m_view.Width * 0.1f, m_view.Bottom);
break;
case ScrollEventType.SmallIncrement:
m_view = new RectD(m_view.Left + m_view.Width * 0.1f, m_view.Top, m_view.Right + m_view.Width * 0.1f, m_view.Bottom);
break;
case ScrollEventType.ThumbTrack:
{
double tp = si.nTrackPos / ScrollScale * m_physExtents.Width + m_physExtents.Left;
m_view = new RectD(tp, m_view.Top, tp + m_view.Width, m_view.Bottom);
}
break;
}
ClampView();
UpdateScroll();
Invalidate();
hasViewChanged = true;
}
else if (se.ScrollOrientation == ScrollOrientation.VerticalScroll)
{
GDI.SCROLLINFO si = new GDI.SCROLLINFO();
si.cbSize = System.Runtime.InteropServices.Marshal.SizeOf(typeof(GDI.SCROLLINFO));
si.fMask = (int)(GDI.ScrollInfoMask.SIF_TRACKPOS | GDI.ScrollInfoMask.SIF_PAGE | GDI.ScrollInfoMask.SIF_POS);
GDI.GetScrollInfo(Handle, (int)GDI.ScrollBarDirection.SB_VERT, ref si);
switch (se.Type)
{
case ScrollEventType.LargeDecrement:
m_view = new RectD(m_view.Left, m_view.Top - m_view.Height, m_view.Right, m_view.Bottom - m_view.Height);
break;
case ScrollEventType.LargeIncrement:
m_view = new RectD(m_view.Left, m_view.Top + m_view.Height, m_view.Right, m_view.Bottom + m_view.Height);
break;
case ScrollEventType.SmallDecrement:
m_view = new RectD(m_view.Left, m_view.Top - m_view.Height * 0.1f, m_view.Right, m_view.Bottom - m_view.Height * 0.1f);
break;
case ScrollEventType.SmallIncrement:
m_view = new RectD(m_view.Left, m_view.Top + m_view.Height * 0.1f, m_view.Right, m_view.Bottom + m_view.Height * 0.1f);
break;
case ScrollEventType.ThumbTrack:
{
double tp = si.nTrackPos / ScrollScale * m_physExtents.Height + m_physExtents.Top;
m_view = new RectD(m_view.Left, tp, m_view.Right, tp + m_view.Height);
}
break;
}
ClampView();
UpdateScroll();
Invalidate();
hasViewChanged = true;
}
if (hasViewChanged)
{
OnViewChanged();
}
}