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[Win] More robust pixel format selection

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This patch adds more robust checks for WGL_ARB_pixel_format and
WGL_ARB_multisample before using the relevant extensions, and adds
checks whether Wgl.Arb.ChoosePixelFormat() returns a valid pixel format
before trying to use it (thanks to Repetier for catching this edge
case.)

Additionally, the ChoosePixelFormatPFD code-path now heavily penalizes
single-buffered modes when the user requests a double-buffered mode.

Affects issues #42 and #45
This commit is contained in:
Stefanos A. 2014-01-10 15:41:57 +01:00
parent ef5aedba6f
commit bdfcf43e0b
1 changed files with 9 additions and 10 deletions
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19
Source/OpenTK/Platform/Windows/WinGraphicsMode.cs
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@ -99,7 +99,8 @@ namespace OpenTK.Platform.Windows
GraphicsMode ChoosePixelFormatARB(IntPtr device, GraphicsMode mode)
{
GraphicsMode created_mode = null;
if (Wgl.Delegates.wglChoosePixelFormatARB != null)
if (Wgl.SupportsExtension("WGL_ARB_pixel_format") &&
Wgl.Delegates.wglChoosePixelFormatARB != null)
{
List<int> attributes = new List<int>();
attributes.Add((int)WGL_ARB_pixel_format.AccelerationArb);
@ -168,7 +169,8 @@ namespace OpenTK.Platform.Windows
attributes.Add(mode.AccumulatorFormat.Alpha);
}
if (mode.Samples > 0)
if (mode.Samples > 0 &&
Wgl.SupportsExtension("WGL_ARB_multisample"))
{
attributes.Add((int)WGL_ARB_multisample.SampleBuffersArb);
attributes.Add(1);
@ -193,7 +195,8 @@ namespace OpenTK.Platform.Windows
int[] format = new int[1];
int count;
if (Wgl.Arb.ChoosePixelFormat(device, attributes.ToArray(), null, format.Length, format, out count))
if (Wgl.Arb.ChoosePixelFormat(device, attributes.ToArray(), null, format.Length, format, out count)
&& count > 0)
{
created_mode = DescribePixelFormatARB(device, format[0]);
}
@ -271,13 +274,6 @@ namespace OpenTK.Platform.Windows
{
flags |= PixelFormatDescriptorFlags.STEREO;
}
if (mode.Buffers > 1)
{
// On Win7 64bit + Nvidia 650M, no pixel format advertises DOUBLEBUFFER.
// Adding this check here causes mode selection to fail.
// Does not appear to be supported by DescribePixelFormat
//flags |= PixelFormatDescriptorFlags.DOUBLEBUFFER;
}
if (System.Environment.OSVersion.Version.Major >= 6 &&
requested_acceleration_type != AccelerationType.None)
@ -304,6 +300,9 @@ namespace OpenTK.Platform.Windows
valid &= GetAccelerationType(ref pfd) == requested_acceleration_type;
valid &= (pfd.Flags & flags) == flags;
valid &= pfd.PixelType == PixelType.RGBA; // indexed modes not currently supported
// heavily penalize single-buffered modes when the user requests double buffering
if ((pfd.Flags & PixelFormatDescriptorFlags.DOUBLEBUFFER) == 0 && mode.Buffers > 1)
dist += 1000;
valid &= Compare(pfd.ColorBits, mode.ColorFormat.BitsPerPixel, ref dist);
valid &= Compare(pfd.RedBits, mode.ColorFormat.Red, ref dist);
valid &= Compare(pfd.GreenBits, mode.ColorFormat.Green, ref dist);