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297 lines
10 KiB
C#
297 lines
10 KiB
C#
#region --- License ---
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/* Copyright (c) 2006, 2007 Stefanos Apostolopoulos
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* Contributions by Andy Gill.
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* See license.txt for license info
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*/
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#endregion
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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Reflection;
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using OpenTK.Platform;
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using OpenTK.Math;
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using OpenTK.OpenGL.Enums;
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namespace OpenTK.OpenGL
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{
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public static partial class Glu
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{
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private const string Library = "glu32.dll";
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private static Dictionary<string, bool> AvailableExtensions = new Dictionary<string, bool>();
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private static bool rebuildExtensionList = true;
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private static Assembly assembly;
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private static Type glClass;
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private static Type delegatesClass;
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private static Type importsClass;
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static Glu()
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{
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assembly = Assembly.GetExecutingAssembly();//Assembly.Load("OpenTK.OpenGL");
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glClass = assembly.GetType("OpenTK.OpenGL.Glu");
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delegatesClass = glClass.GetNestedType("Delegates", BindingFlags.Static | BindingFlags.NonPublic);
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importsClass = glClass.GetNestedType("Imports", BindingFlags.Static | BindingFlags.NonPublic);
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}
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#region private static Delegate GetDelegate(string name, Type signature)
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/// <summary>
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/// Creates a System.Delegate that can be used to call a GLU function, core or extension.
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/// </summary>
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/// <param name="name">The name of the GLU function (eg. "gluBuild2DMipmaps")</param>
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/// <param name="signature">The signature of the GLU function.</param>
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/// <returns>
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/// A System.Delegate that can be used to call this GLU function, or null if the specified
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/// function name did not correspond to an GLU function.
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/// </returns>
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private static Delegate GetDelegate(string name, Type signature)
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{
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MethodInfo m = importsClass.GetMethod(name.Substring(3), BindingFlags.Static | BindingFlags.NonPublic);
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return
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GL.GetExtensionDelegate(name, signature) ??
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(m != null ? Delegate.CreateDelegate(signature, m) : null);
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}
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#endregion
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#region public static void LoadAll()
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/// <summary>
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/// Loads all GLU functions (core and extensions).
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/// </summary>
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/// <remarks>
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/// <para>
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/// Call this function manually whenever you need to update GLU entry points.
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/// This need will never arise under normal usage patterns.
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/// </para>
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/// </remarks>
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public static void LoadAll()
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{
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FieldInfo[] v = delegatesClass.GetFields(BindingFlags.Static | BindingFlags.NonPublic);
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foreach (FieldInfo f in v)
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{
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f.SetValue(null, GetDelegate(f.Name, f.FieldType));
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}
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AvailableExtensions.Clear();
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rebuildExtensionList = true;
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}
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#endregion
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#region public static bool Load(string function)
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/// <summary>
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/// Tries to reload the given GLU function (core or extension).
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/// </summary>
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/// <param name="name">The name of the GLU function.</param>
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/// <returns>True if the function was found and reloaded, false otherwise.</returns>
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/// <remarks>
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/// <para>
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/// While the automatic initialisation will load all GLU entry points, in some cases
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/// the initialization can take place before a render context has been established.
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/// In this case, use this function to load the entry points for the GLU functions
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/// you will need, or use LoadAll() to load all available entry points.
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/// </para>
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/// <para>
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/// This function returns true if the given GLU function is supported, false otherwise.
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/// </para>
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/// <para>
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/// To query for supported extensions use the IsExtensionSupported() function instead.
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/// </para>
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/// </remarks>
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public static bool Load(string function)
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{
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FieldInfo f = delegatesClass.GetField(function);
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if (f == null)
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return false;
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f.SetValue(null, GetDelegate(f.Name, f.FieldType));
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rebuildExtensionList = true;
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return f.GetValue(null) != null;
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}
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#endregion
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#region public static bool SupportsExtension(string name)
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/// <summary>
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/// Determines whether the specified GLU extension is available in
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/// the current GLU context.
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/// </summary>
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/// <param name="name">The string for the GLU extension.</param>
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/// <returns>True if the specified extension is available, false otherwise.</returns>
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public static bool SupportsExtension(string name)
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{
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if (rebuildExtensionList)
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{
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BuildExtensionList();
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}
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// Search the cache for the string. Note that the cache substitutes
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// strings "1.0" to "2.1" with "GL_VERSION_1_0" to "GL_VERSION_2_1"
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if (AvailableExtensions.ContainsKey(name))
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{
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return AvailableExtensions[name];
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}
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return false;
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}
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#endregion
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#region private static void BuildExtensionList()
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/// <summary>
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/// Builds a cache of the supported extensions to speed up searches.
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/// </summary>
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private static void BuildExtensionList()
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{
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// Assumes there is an opengl context current.
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AvailableExtensions.Clear();
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string version_string = Glu.GetString(GluStringName.Version);
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if (String.IsNullOrEmpty(version_string))
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{
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throw new ApplicationException("Failed to build extension list. Is there an opengl context current?");
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}
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string version = version_string.Trim(' ');
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if (version.StartsWith("1.0"))
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{
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AvailableExtensions.Add("VERSION_1_0", true);
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}
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else if (version.StartsWith("1.1"))
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{
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AvailableExtensions.Add("VERSION_1_0", true);
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AvailableExtensions.Add("VERSION_1_1", true);
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}
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else if (version.StartsWith("1.2"))
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{
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AvailableExtensions.Add("VERSION_1_0", true);
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AvailableExtensions.Add("VERSION_1_1", true);
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AvailableExtensions.Add("VERSION_1_2", true);
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}
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else if (version.StartsWith("1.3"))
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{
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AvailableExtensions.Add("VERSION_1_0", true);
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AvailableExtensions.Add("VERSION_1_1", true);
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AvailableExtensions.Add("VERSION_1_2", true);
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AvailableExtensions.Add("VERSION_1_3", true);
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}
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string extension_string = Glu.GetString(GluStringName.Extensions);
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if (String.IsNullOrEmpty(extension_string))
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{ // no extensions are available
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return;
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}
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string[] extensions = extension_string.Split(' ');
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foreach (string ext in extensions)
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{
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AvailableExtensions.Add(ext, true);
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}
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rebuildExtensionList = false;
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}
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#endregion
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public class GLUnurbs
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{
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}
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public class GLUtesselator
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{
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}
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public class GLUquadric
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{
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}
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#region Overloads
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public static void LookAt(Vector3 eye, Vector3 center, Vector3 up)
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{
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Delegates.gluLookAt((double)eye.X, (double)eye.Y, (double)eye.Z, (double)center.X, (double)center.Y, (double)center.Z, (double)up.X, (double)up.Y, (double)up.Z);
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}
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// One token Project overload, I picked this one because it's CLS compliant, and it
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// makes reasonably clear which args are inputs and which are outputs.
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public static Int32 Project(Vector3 obj, double[] model, double[] proj, Int32[] view, out Vector3 win)
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{
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unsafe
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{
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double winX, winY, winZ;
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double* winX_ptr = &winX;
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double* winY_ptr = &winY;
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double* winZ_ptr = &winZ;
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fixed (double* model_ptr = model)
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fixed (double* proj_ptr = proj)
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fixed (Int32* view_ptr = view)
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{
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Int32 retval = Delegates.gluProject((double)obj.X, (double)obj.Y, (double)obj.Z, (double*)model_ptr, (double*)proj_ptr, (Int32*)view_ptr, (double*)winX_ptr, (double*)winY_ptr, (double*)winZ_ptr);
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win = new Vector3((float)*winX_ptr, (float)*winY_ptr, (float)*winZ_ptr);
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return retval;
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}
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}
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}
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public static void TessNormal(int tess, Vector3 normal)
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{
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Delegates.gluTessNormal((int)tess, (double)normal.X, (double)normal.Y, (double)normal.Z);
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}
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public static Int32 UnProject(Vector3 win, double[] model, double[] proj, Int32[] view, out Vector3 obj)
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{
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unsafe
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{
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double objX, objY, objZ;
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double* objX_ptr = &objX;
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double* objY_ptr = &objY;
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double* objZ_ptr = &objZ;
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fixed (double* model_ptr = model)
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fixed (double* proj_ptr = proj)
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fixed (Int32* view_ptr = view)
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{
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Int32 retval = Delegates.gluUnProject((double)win.X, (double)win.Y, (double)win.Z, (double*)model_ptr, (double*)proj_ptr, (Int32*)view_ptr, (double*)objX_ptr, (double*)objY_ptr, (double*)objZ_ptr);
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obj = new Vector3((float)*objX_ptr, (float)*objY_ptr, (float)*objZ_ptr);
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return retval;
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}
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}
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}
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public static Int32 UnProject4(Vector4 win, double[] model, double[] proj, Int32[] view, double near, double far, out Vector4 obj)
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{
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unsafe
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{
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double objX, objY, objZ, objW;
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double* objX_ptr = &objX;
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double* objY_ptr = &objY;
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double* objZ_ptr = &objZ;
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double* objW_ptr = &objW;
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fixed (double* model_ptr = model)
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fixed (double* proj_ptr = proj)
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fixed (Int32* view_ptr = view)
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{
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Int32 retval = Delegates.gluUnProject4((double)win.X, (double)win.Y, (double)win.Z, (double)win.W, (double*)model_ptr, (double*)proj_ptr, (Int32*)view_ptr, (double)near, (double)far, (double*)objX_ptr, (double*)objY_ptr, (double*)objZ_ptr, (double*)objW_ptr);
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obj = new Vector4((float)*objX_ptr, (float)*objY_ptr, (float)*objZ_ptr, (float)*objW_ptr);
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return retval;
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}
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}
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}
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public static string ErrorString(ErrorCode error)
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{
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return ErrorString((GluErrorCode)error);
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}
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#endregion
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}
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}
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