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using System;
using System.IO;
using Drawing2D;
using Glfw;
namespace Crow.CairoBackend
{
public class EglBackend : CairoBackendBase {
EGLDevice device;
/// <summary>
/// Create a new generic backend bound to the application surface
/// </summary>
/// <param name="width">backend surface width</param>
/// <param name="height">backend surface height</param>
public EglBackend (ref IntPtr nativeWindoPointer, out bool ownGlfwWinHandle, int width, int height) : base () {
if (nativeWindoPointer == IntPtr.Zero) {
Glfw3.Init ();
Glfw3.WindowHint (WindowAttribute.ClientApi, Constants.OpenglEsApi);
Glfw3.WindowHint (WindowAttribute.ContextVersionMajor, 3);
Glfw3.WindowHint (WindowAttribute.ContextVersionMinor, 2);
Glfw3.WindowHint (WindowAttribute.ContextCreationApi, Constants.EglContextApi);
Glfw3.WindowHint (WindowAttribute.Resizable, 1);
Glfw3.WindowHint (WindowAttribute.Decorated, 1);
hWin = Glfw3.CreateWindow (width, height, "win name", MonitorHandle.Zero, IntPtr.Zero);
if (hWin == IntPtr.Zero)
throw new Exception ("[GLFW3] Unable to create Window");
nativeWindoPointer = hWin;
ownGlfwWinHandle = true;
} else {
hWin = nativeWindoPointer;
ownGlfwWinHandle = false;
}
Glfw3.MakeContextCurrent (hWin);
Glfw3.SwapInterval (0);
device = new EGLDevice (Glfw3.GetEGLDisplay (), Glfw3.GetEGLContext (hWin));
surf = new GLSurface (device, Glfw3.GetEGLSurface (hWin), width, height);
}
/// <summary>
/// Create a new offscreen backend, used in perfTests
/// </summary>
/// <param name="width">backend surface width</param>
/// <param name="height">backend surface height</param>
public EglBackend (int width, int height) : base () {
device = new EGLDevice (Glfw3.GetEGLDisplay (), IntPtr.Zero);
surf = new GLTextureSurface (device, width, height);
}
public override ISurface CreateSurface(int width, int height)
//=> new GLTextureSurface (device, width, height);
=> new ImageSurface (Format.ARGB32, width, height);
public override ISurface CreateSurface(byte[] data, int width, int height)
=> new ImageSurface (data, Format.ARGB32, width, height, 4 * width);
public override IContext PrepareUIFrame(IContext existingContext, IRegion clipping)
{
Glfw3.MakeContextCurrent (hWin);
IContext ctx = base.PrepareUIFrame (existingContext, clipping);
clear (ctx);
return ctx;
}
public override void FlushUIFrame(IContext ctx)
{
base.FlushUIFrame (ctx);
(surf as GLSurface).SwapBuffers ();
}
}
}
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