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using Gdk;
using System;
using System.Runtime.InteropServices;
using System.Runtime.Versioning;
namespace Ryujinx.UI.Helper
{
public delegate void UpdateBoundsCallbackDelegate(Window window);
[SupportedOSPlatform("macos")]
static partial class MetalHelper
{
private const string LibObjCImport = "/usr/lib/libobjc.A.dylib";
private readonly struct Selector
{
public readonly IntPtr NativePtr;
public unsafe Selector(string value)
{
int size = System.Text.Encoding.UTF8.GetMaxByteCount(value.Length);
byte* data = stackalloc byte[size];
fixed (char* pValue = value)
{
System.Text.Encoding.UTF8.GetBytes(pValue, value.Length, data, size);
}
NativePtr = sel_registerName(data);
}
public static implicit operator Selector(string value) => new(value);
}
private static unsafe IntPtr GetClass(string value)
{
int size = System.Text.Encoding.UTF8.GetMaxByteCount(value.Length);
byte* data = stackalloc byte[size];
fixed (char* pValue = value)
{
System.Text.Encoding.UTF8.GetBytes(pValue, value.Length, data, size);
}
return objc_getClass(data);
}
private struct NsPoint
{
public double X;
public double Y;
public NsPoint(double x, double y)
{
X = x;
Y = y;
}
}
private struct NsRect
{
public NsPoint Pos;
public NsPoint Size;
public NsRect(double x, double y, double width, double height)
{
Pos = new NsPoint(x, y);
Size = new NsPoint(width, height);
}
}
public static IntPtr GetMetalLayer(Display display, Window window, out IntPtr nsView, out UpdateBoundsCallbackDelegate updateBounds)
{
nsView = gdk_quartz_window_get_nsview(window.Handle);
// Create a new CAMetalLayer.
IntPtr layerClass = GetClass("CAMetalLayer");
IntPtr metalLayer = IntPtr_objc_msgSend(layerClass, "alloc");
objc_msgSend(metalLayer, "init");
// Create a child NSView to render into.
IntPtr nsViewClass = GetClass("NSView");
IntPtr child = IntPtr_objc_msgSend(nsViewClass, "alloc");
objc_msgSend(child, "init", new NsRect());
// Add it as a child.
objc_msgSend(nsView, "addSubview:", child);
// Make its renderer our metal layer.
objc_msgSend(child, "setWantsLayer:", (byte)1);
objc_msgSend(child, "setLayer:", metalLayer);
objc_msgSend(metalLayer, "setContentsScale:", (double)display.GetMonitorAtWindow(window).ScaleFactor);
// Set the frame position/location.
updateBounds = (Window window) =>
{
window.GetPosition(out int x, out int y);
int width = window.Width;
int height = window.Height;
objc_msgSend(child, "setFrame:", new NsRect(x, y, width, height));
};
updateBounds(window);
return metalLayer;
}
[LibraryImport(LibObjCImport)]
private static unsafe partial IntPtr sel_registerName(byte* data);
[LibraryImport(LibObjCImport)]
private static unsafe partial IntPtr objc_getClass(byte* data);
[LibraryImport(LibObjCImport)]
private static partial void objc_msgSend(IntPtr receiver, Selector selector);
[LibraryImport(LibObjCImport)]
private static partial void objc_msgSend(IntPtr receiver, Selector selector, byte value);
[LibraryImport(LibObjCImport)]
private static partial void objc_msgSend(IntPtr receiver, Selector selector, IntPtr value);
[LibraryImport(LibObjCImport)]
private static partial void objc_msgSend(IntPtr receiver, Selector selector, NsRect point);
[LibraryImport(LibObjCImport)]
private static partial void objc_msgSend(IntPtr receiver, Selector selector, double value);
[LibraryImport(LibObjCImport, EntryPoint = "objc_msgSend")]
private static partial IntPtr IntPtr_objc_msgSend(IntPtr receiver, Selector selector);
[LibraryImport("libgdk-3.0.dylib")]
private static partial IntPtr gdk_quartz_window_get_nsview(IntPtr gdkWindow);
}
}
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