void EnumerateSupportedSamples(DummyWindow dummyWindow)
{
NativeAPI.wglGetPixelFormatAttribiARB GetPixelFormatAttribi;
NativeAPI.wglGetPixelFormatAttribivARB GetPixelFormatAttribiv;
dummyWindow.GetNativeProc("wglGetPixelFormatAttribivARB", out GetPixelFormatAttribi);
dummyWindow.GetNativeProc("wglGetPixelFormatAttribivARB", out GetPixelFormatAttribiv);
int num_format_attr = NativeAPI.WGL_NUMBER_PIXEL_FORMATS_ARB;
int num_formats;
if (GetPixelFormatAttribi(dummyWindow.dc, 0, 0, 1, ref num_format_attr, out num_formats))
{
int[] attr =
{
NativeAPI.WGL_DRAW_TO_WINDOW_ARB, // 0
NativeAPI.WGL_ACCELERATION_ARB, // 1
NativeAPI.WGL_SUPPORT_OPENGL_ARB, // 2
NativeAPI.WGL_DOUBLE_BUFFER_ARB, // 3
NativeAPI.WGL_PIXEL_TYPE_ARB, // 4
NativeAPI.WGL_COLOR_BITS_ARB, // 5
NativeAPI.WGL_ALPHA_BITS_ARB, // 6
NativeAPI.WGL_DEPTH_BITS_ARB, // 7
NativeAPI.WGL_STENCIL_BITS_ARB, // 8
NativeAPI.WGL_SAMPLE_BUFFERS_ARB, // 9
NativeAPI.WGL_SAMPLES_ARB, // 10
};
int[] values = new int[attr.Length];
for (int i = 1; i <= num_formats; i++)
{
if (GetPixelFormatAttribiv(dummyWindow.dc, i, 0, attr.Length, attr, values))
{
if (values[0] == 1 && // WGL_DRAW_TO_WINDOW_ARB
values[1] == NativeAPI.WGL_FULL_ACCELERATION_ARB && // WGL_ACCELERATION_ARB
values[2] == 1 && // WGL_SUPPORT_OPENGL_ARB
values[3] == 1 && // WGL_DOUBLE_BUFFER_ARB
values[4] == NativeAPI.WGL_TYPE_RGBA_ARB && // WGL_PIXEL_TYPE_ARB
values[5] >= 24 && // WGL_COLOR_BITS_ARB
values[6] >= 8 && // WGL_ALPHA_BITS_ARB
values[7] == 24 && // WGL_DEPTH_BITS_ARB
values[8] == 8 && // WGL_STENCIL_BITS_ARB
values[9] == 1) // WGL_SAMPLE_BUFFERS_ARB
{
SupportedSamples |= (long)1 << values[10]; // WGL_SAMPLES_ARB
}
}
}
}
}
int ChoosePixelFormat(ref NativeAPI.PixelFormatDescriptor pfd)
{
try
{
using (DummyWindow dummyWindow = new DummyWindow(ref pfd))
{
EnumerateSupportedSamples(dummyWindow);
if (dummyWindow.Extensions.Contains("WGL_EXT_swap_control"))
{
dummyWindow.GetNativeProc("wglSwapIntervalEXT", out SwapInterval);
}
if (dummyWindow.Extensions.Contains("WGL_ARB_pixel_format"))
{
NativeAPI.wglChoosePixelFormatARB ChoosePixelFormatARB;
dummyWindow.GetNativeProc("wglChoosePixelFormatARB", out ChoosePixelFormatARB);
if (dummyWindow.Extensions.Contains("WGL_ARB_multisample") == false)
{
Samples = 0;
}
int[] attrib =
{
NativeAPI.WGL_DRAW_TO_WINDOW_ARB, 1,
NativeAPI.WGL_ACCELERATION_ARB, NativeAPI.WGL_FULL_ACCELERATION_ARB,
NativeAPI.WGL_SUPPORT_OPENGL_ARB, 1,
NativeAPI.WGL_DOUBLE_BUFFER_ARB, 1,
NativeAPI.WGL_COLOR_BITS_ARB, 24,
NativeAPI.WGL_RED_BITS_ARB, 8,
NativeAPI.WGL_GREEN_BITS_ARB, 8,
NativeAPI.WGL_BLUE_BITS_ARB, 8,
NativeAPI.WGL_ALPHA_BITS_ARB, 0,
NativeAPI.WGL_DEPTH_BITS_ARB, 24,
NativeAPI.WGL_STENCIL_BITS_ARB, 8,
0, 0,
0, 0,
0
};
if (Samples > 0)
{
attrib[attrib.Length - 5 + 0] = NativeAPI.WGL_SAMPLE_BUFFERS_ARB;
attrib[attrib.Length - 5 + 1] = 1;
attrib[attrib.Length - 5 + 2] = NativeAPI.WGL_SAMPLES_ARB;
attrib[attrib.Length - 5 + 3] = Samples;
}
int count;
bool validpf = false;
int[] piFormats = new int[1];
do
{
if (!ChoosePixelFormatARB(dummyWindow.dc, attrib, null, 1, piFormats, out count))
{
return 0;
}
if (count == 0)
{
if (Samples != 0)
{
Samples--;
attrib[attrib.Length - 5 + 3] = Samples;
}
else
{
break;
}
}
else
{
validpf = true;
}
}
while (!validpf && count == 0);
if (validpf)
{
return piFormats[0];
}
}
}
}
catch (ApplicationException)
{
}
return NativeAPI.ChoosePixelFormat(this.dc, ref pfd);
}