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[SDL2] Use RelaxGraphicsMode to find optimal mode

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For SDL2, RelaxGraphicsMode requires us to clear context attributes
between consecutive attempts. This is implemented by calling
ClearGLAttributes().
This commit is contained in:
thefiddler 2014-01-22 11:37:37 +01:00
parent 0575e63a27
commit 417a6bedc1
1 changed files with 39 additions and 2 deletions
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37
Source/OpenTK/Platform/SDL2/Sdl2GraphicsContext.cs
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@ -62,9 +62,21 @@ namespace OpenTK.Platform.SDL2
: this(win)
{
lock (SDL.Sync)
{
bool retry = false;
do
{
SetGLAttributes(mode, shareContext, major, minor, flags);
SdlContext = new ContextHandle(SDL.GL.CreateContext(Window.Handle));
// If we failed to create a valid context, relax the GraphicsMode
// and try again.
retry =
SdlContext == ContextHandle.Zero &&
Utilities.RelaxGraphicsMode(ref mode);
}
while (retry);
if (SdlContext == ContextHandle.Zero)
{
var error = SDL.GetError();
@ -152,12 +164,37 @@ namespace OpenTK.Platform.SDL2
stereo != 0 ? true : false);
}
static void ClearGLAttributes()
{
SDL.GL.SetAttribute(ContextAttribute.ACCUM_ALPHA_SIZE, 0);
SDL.GL.SetAttribute(ContextAttribute.ACCUM_RED_SIZE, 0);
SDL.GL.SetAttribute(ContextAttribute.ACCUM_GREEN_SIZE, 0);
SDL.GL.SetAttribute(ContextAttribute.ACCUM_BLUE_SIZE, 0);
SDL.GL.SetAttribute(ContextAttribute.DOUBLEBUFFER, 0);
SDL.GL.SetAttribute(ContextAttribute.ALPHA_SIZE, 0);
SDL.GL.SetAttribute(ContextAttribute.RED_SIZE, 0);
SDL.GL.SetAttribute(ContextAttribute.GREEN_SIZE, 0);
SDL.GL.SetAttribute(ContextAttribute.BLUE_SIZE, 0);
SDL.GL.SetAttribute(ContextAttribute.DEPTH_SIZE, 0);
SDL.GL.SetAttribute(ContextAttribute.MULTISAMPLEBUFFERS, 0);
SDL.GL.SetAttribute(ContextAttribute.MULTISAMPLESAMPLES, 0);
SDL.GL.SetAttribute(ContextAttribute.STENCIL_SIZE, 0);
SDL.GL.SetAttribute(ContextAttribute.STEREO, 0);
SDL.GL.SetAttribute(ContextAttribute.CONTEXT_MAJOR_VERSION, 1);
SDL.GL.SetAttribute(ContextAttribute.CONTEXT_MINOR_VERSION, 0);
SDL.GL.SetAttribute(ContextAttribute.CONTEXT_FLAGS, 0);
SDL.GL.SetAttribute(ContextAttribute.CONTEXT_EGL, 0);
SDL.GL.SetAttribute(ContextAttribute.CONTEXT_PROFILE_MASK, 0);
SDL.GL.SetAttribute(ContextAttribute.SHARE_WITH_CURRENT_CONTEXT, 0);
}
static void SetGLAttributes(GraphicsMode mode,
IGraphicsContext shareContext,
int major, int minor,
GraphicsContextFlags flags)
{
ContextProfileFlags cpflags = 0;
ClearGLAttributes();
if (mode.AccumulatorFormat.BitsPerPixel > 0)
{