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106 lines
4.2 KiB
C#
106 lines
4.2 KiB
C#
#region License
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//
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// The Open Toolkit Library License
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//
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// Copyright (c) 2006 - 2009 the Open Toolkit library.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights to
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// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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// the Software, and to permit persons to whom the Software is furnished to do
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// so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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// OTHER DEALINGS IN THE SOFTWARE.
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//
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#endregion
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using System;
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using System.Runtime.InteropServices;
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namespace OpenTK.Graphics
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{
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/// <summary>
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/// Implements BindingsBase for the OpenTK.Graphics namespace (OpenGL and OpenGL|ES).
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/// </summary>
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public abstract class GraphicsBindingsBase : BindingsBase
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{
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/// <summary>
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/// Contains the list of API entry points (function pointers).
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/// This field must be set by an inheriting class.
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/// </summary>
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[Obsolete("Not used - this field remains for 1.1 API compatibility")]
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protected IntPtr[] EntryPointsInstance;
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/// <summary>
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/// with the 1.1 API.
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/// Contains the list of API entry point names.
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/// This field must be set by an inheriting class.
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/// </summary>
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[Obsolete("Not used - this field remains for 1.1 API compatibility")]
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protected string[] EntryPointNamesInstance;
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internal IntPtr[] _EntryPointsInstance;
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internal byte[] _EntryPointNamesInstance;
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internal int[] _EntryPointNameOffsetsInstance;
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/// <summary>
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/// Retrieves an unmanaged function pointer to the specified function.
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/// </summary>
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/// <param name="funcname">
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/// A <see cref="System.String"/> that defines the name of the function.
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/// </param>
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/// <returns>
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/// A <see cref="IntPtr"/> that contains the address of funcname or IntPtr.Zero,
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/// if the function is not supported by the drivers.
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/// </returns>
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/// <remarks>
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/// Note: some drivers are known to return non-zero values for unsupported functions.
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/// Typical values include 1 and 2 - inheritors are advised to check for and ignore these
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/// values.
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/// </remarks>
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protected override IntPtr GetAddress(string funcname)
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{
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var context = GraphicsContext.CurrentContext as IGraphicsContextInternal;
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if (context == null)
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throw new GraphicsContextMissingException();
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return context != null ? context.GetAddress(funcname) : IntPtr.Zero;
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}
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// Loads all available entry points for the current API.
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// Note: we prefer IGraphicsContextInternal.GetAddress over
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// this.GetAddress to improve loading performance (less
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// validation necessary.)
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internal override void LoadEntryPoints()
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{
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IGraphicsContext context = GraphicsContext.CurrentContext;
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if (context == null)
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throw new GraphicsContextMissingException();
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IGraphicsContextInternal context_internal = context as IGraphicsContextInternal;
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unsafe
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{
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fixed (byte* name = _EntryPointNamesInstance)
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{
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for (int i = 0; i < _EntryPointsInstance.Length; i++)
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{
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_EntryPointsInstance[i] = context_internal.GetAddress(
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new IntPtr(name + _EntryPointNameOffsetsInstance[i]));
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}
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}
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}
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}
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}
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}
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