Add ANGLE to GLFW (#1321)

Author: cyraid

src/Windowing/Silk.NET.GLFW/Enums/AnglePlatformType.cs

@@ -0,0 +1,47 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+namespace Silk.NET.GLFW
+{
+    /// <summary>
+    /// Values for the Initialization Hint AnglePlatformType used in <see cref="InitHint" />
+    /// which sets the rendering backend when using ANGLE.
+    /// </summary>
+    public enum AnglePlatformType
+    {
+        /// <summary>
+        /// No Rendering Backend.
+        /// </summary>
+        None = 0x00037001,
+
+        /// <summary>
+        /// Use OpenGL ANGLE Platform Type.
+        /// </summary>
+        OpenGL = 0x00037002,
+
+        /// <summary>
+        /// Use OpenGLES ANGLE Platform Type.
+        /// </summary>
+        OpenGLES = 0x00037003,
+
+        /// <summary>
+        /// Use Direct3D 9 ANGLE Platform Type.
+        /// </summary>
+        D3D9 = 0x00037004,
+
+        /// <summary>
+        /// Use Direct3D 11 ANGLE Platform Type.
+        /// </summary>
+        D3D11 = 0x00037005,
+
+        /// <summary>
+        /// Use Vulkan ANGLE Platform Type.
+        /// </summary>
+        Vulkan = 0x00037007,
+
+        /// <summary>
+        /// Use Metal (Apple Devices like Mac/iOS, etc) ANGLE Platform Type.
+        /// </summary>
+        Metal = 0x00037008
+    }
+}

src/Windowing/Silk.NET.GLFW/Enums/Bool.cs

@@ -0,0 +1,21 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+namespace Silk.NET.GLFW
+{
+    /// <summary>
+    /// Used where the GLFW Library expects GLFW_FALSE and GLFW_TRUE.
+    /// </summary>
+    public enum Bool
+    {
+        /// <summary>
+        /// Use where the library would expect GLFW_FALSE.
+        /// </summary>
+        False = 0,
+
+        /// <summary>
+        /// Use where the Library would expect GLFW_TRUE.
+        /// </summary>
+        True = 1,
+    }
+}

src/Windowing/Silk.NET.GLFW/Enums/InitHint.cs

@@ -17,6 +17,17 @@ public enum InitHint
         /// </summary>
         JoystickHatButtons = 0x00050001,
 
+        /// <summary>
+        /// Introduced in GLFW 3.4, this enum is used to specify the platform
+        /// type (rendering backend) to request when using OpenGL ES and EGL via
+        /// ANGLE. If the requested platform type is unavailable, ANGLE will use
+        /// its default. Please see <see cref="AnglePlatformType" /> for
+        /// possible values. The ANGLE platform type is specified via the
+        /// EGL_ANGLE_platform_angle extension. This extension is not used if
+        /// this hint is AnglePlatformType.None, which is the default value.
+        /// </summary>
+        AnglePlatformType = 0x00050002,
+
         /// <summary>
         /// Used to specify whether to set the current directory to the application to the Contents/Resources
         /// subdirectory of the application's bundle, if present.
@@ -37,4 +48,4 @@ public enum InitHint
         /// </remarks>
         CocoaMenubar = 0x00051002
     }
-}
+}

src/Windowing/Silk.NET.GLFW/Glfw.cs

@@ -172,6 +172,41 @@ public static void ThrowExceptions()
         /// </remarks>
         public partial void InitHint(InitHint hint, bool value);
 
+        /// <summary>
+        /// <para>
+        /// This function sets hints for the next initialization of GLFW.
+        /// </para>
+        /// <para>
+        /// The values you set hints to are never reset by GLFW, but they only take effect during initialization.
+        /// </para>
+        /// <para>
+        /// Once GLFW has been initialized,
+        /// any values you set will be ignored until the library is terminated and initialized again.
+        /// </para>
+        /// <para>
+        /// Some hints are platform specific.
+        /// These may be set on any platform but they will only affect their specific platform.
+        /// Other platforms will ignore them. Setting these hints requires no platform specific headers or functions.
+        /// </para>
+        /// </summary>
+        /// <param name="hint">The <see cref="NET.GLFW.InitHint" /> to set.</param>
+        /// <param name="value">You may use <see cref="Bool"/> for GL_TRUE
+        /// and GL_FALSE, <see cref="AnglePlatformType"/> for the
+        /// AnglePlatformType enum, or any other GLFW supported integer value.
+        /// </param>
+        /// <remarks>
+        /// <para>
+        /// This function may be called before <see cref="Init" />.
+        /// </para>
+        /// <para>
+        /// This function must only be called from the main thread.
+        /// </para>
+        /// <para>
+        /// Possible errors include <see cref="ErrorCode.InvalidEnum" /> and <see cref="ErrorCode.InvalidValue" />.
+        /// </para>
+        /// </remarks>
+        public partial void InitHint(InitHint hint, int value);
+
         /// <summary>
         /// <para>
         /// This function retrieves the major, minor and revision numbers of the GLFW library.