public static IOSurface Create(Size <Pixels> size)
{
var width = (int)size.Width;
var height = (int)size.Height;
if (width == 0 || height == 0)
{
throw new ArgumentOutOfRangeException("size", "IOSurface dimensions must be greater or equal to 1");
}
using (var properties = NSDictionary.FromObjectsAndKeys(
new object[] {
width, // IOSurfaceWidth
height, // IOSurfaceHeight
4, // IOSurfaceBytesPerElement
true // IOSurfaceIsGlobal
},
new object[] {
"IOSurfaceWidth",
"IOSurfaceHeight",
"IOSurfaceBytesPerElement",
"IOSurfaceIsGlobal"
}))
{
var surface = new IOSurface(IOSurfaceCreate(properties.Handle));
return(surface);
}
}
public static TextureHandle Create(Size <Pixels> size, IOSurface surface)
{
GL.ActiveTexture(TextureUnit.Texture0);
var texture = new TextureHandle(GL.GenTexture());
GL.BindTexture(TextureTarget.TextureRectangle, texture);
GL.TexParameter(TextureTarget.TextureRectangle, TextureParameterName.TextureMagFilter, (int)(TextureMagFilter.Nearest));
GL.TexParameter(TextureTarget.TextureRectangle, TextureParameterName.TextureMinFilter, (int)(TextureMinFilter.Linear));
GL.TexParameter(TextureTarget.TextureRectangle, TextureParameterName.TextureWrapS, (int)(TextureWrapMode.ClampToEdge));
GL.TexParameter(TextureTarget.TextureRectangle, TextureParameterName.TextureWrapT, (int)(TextureWrapMode.ClampToEdge));
Resize(texture, size, surface);
return(texture);
}
public static void Resize(TextureHandle texture, Size <Pixels> size, IOSurface surface)
{
GL.BindTexture(TextureTarget.TextureRectangle, texture);
CGLTexImageIOSurface2D(
CGLContext.CurrentContext.Handle,
(int)TextureTarget.TextureRectangle,
(int)PixelInternalFormat.Rgba,
(int)size.Width,
(int)size.Height,
(int)PixelFormat.Bgra,
(int)PixelType.UnsignedInt8888Reversed,
surface.Handle,
0);
GL.BindTexture(TextureTarget.TextureRectangle, 0);
}
public static FramebufferInfo CreateFramebuffer(this IOSurface surface)
{
var size = surface.Size.Max(1, 1);
var handles = new int[1];
GL.GenFramebuffers(1, handles);
var handle = new FramebufferHandle(handles[0]);
GL.BindFramebuffer(FramebufferTarget.Framebuffer, handle);
var depthbuffer = CreateDepthBuffer(size);
GL.FramebufferRenderbuffer(FramebufferTarget.Framebuffer, FramebufferAttachment.DepthAttachment, RenderbufferTarget.Renderbuffer, depthbuffer);
var colorbuffer = IOSurfaceTexture.Create(size, surface);
GL.FramebufferTexture2D(FramebufferTarget.Framebuffer, FramebufferAttachment.ColorAttachment0, TextureTarget.TextureRectangle, colorbuffer, 0);
CheckStatus();
return(new FramebufferInfo(handle, depthbuffer, Optional.None(), colorbuffer));
}
public static TextureHandle CreateTexture(this IOSurface surface)
{
return(IOSurfaceTexture.Create(surface.Size, surface));
}
public IOSurfaceRenderTargetBuffer(Size <Pixels> size)
{
Size = size;
Surface = IOSurface.Create(new Size <Pixels>(size.Width, size.Height));
}