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* Source/OpenTK/BlittableValueType.cs: Removed struct constraint. Sometimes consumers of this class may not be able to use struct generic constraints - the class is now usable in this case.

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* Source/Examples/OpenTK/Test/BlittableValueTypes.cs: Test BlittableValueType class using several different types.
This commit is contained in:
the_fiddler 2009-11-11 18:21:45 +00:00
parent 1f9c9eac44
commit 5991bee09f
2 changed files with 112 additions and 13 deletions
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93
Source/Examples/OpenTK/Test/BlittableValueTypes.cs Normal file
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@ -0,0 +1,93 @@
#region License
//
// The Open Toolkit Library License
//
// Copyright (c) 2006 - 2008 the Open Toolkit library, except where noted.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do
// so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
//
#endregion
using System;
using System.Diagnostics;
using System.Reflection;
using OpenTK;
namespace Examples.Tests
{
struct Simple { public int Value; }
struct Generic<T> { public T Value; }
enum Enum { First, Second }
struct Complex { public Simple Value; }
struct Complex<T> { public Generic<T> Value; }
struct Complex2 { public Enum Value; }
struct Complex3 { public Class Value; }
struct Complex4 : Interface { public Class Value; }
class Class { public int Value; }
class Class<T> { public T Value; }
interface Interface { }
[Example("Blittable Value Types", ExampleCategory.OpenTK, "Test", Documentation="BlittableValueTypes")]
public class BlittableValueTypes
{
public static void Main()
{
PrintType(new Simple());
PrintType(new Generic<Simple>());
PrintType(new Generic<Enum>());
PrintType(new Complex());
PrintType(new Complex<Enum>());
PrintType(new Complex2());
PrintType(new Complex3());
PrintType(new Complex4());
PrintType(new Class());
PrintType(new Class<Simple>());
}
static bool CheckBlittable<T>(T type)
{
return BlittableValueType.Check(type);
}
static int GetStride<T>(T type)
{
return BlittableValueType.StrideOf(type);
}
static void PrintType<T>(T instance)
{
Type type = typeof(T);
string typename = type.GetFields()[0].FieldType.ToString();
Trace.Write(type.IsClass ? "class " : type.IsEnum ? "enum " : type.IsInterface ? "interface " : "struct ");
Trace.Write(type.Name);
if (type.IsGenericType)
Trace.Write(String.Format("<{0}>", type.GetGenericArguments()[0].Name));
Trace.Write(" { ");
Trace.Write(typename.Substring(typename.LastIndexOf('.') + 1));
Trace.Write(" } ");
Trace.Write(CheckBlittable(instance) ? "is blittable " : "is not blittable ");
try { Trace.Write(String.Format("({0} bytes)", GetStride(instance))); }
catch (Exception e) { Trace.Write(String.Format("({0})", e.GetType().Name)); }
Trace.WriteLine("");
}
}
}

32
Source/OpenTK/BlittableValueType.cs
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@ -1,4 +1,4 @@
#region License
#region License
//
// The Open Toolkit Library License
//
@ -43,11 +43,12 @@ namespace OpenTK
/// A blittable value type is a struct that only references other value types recursively,
/// which allows it to be passed to unmanaged code directly.
/// </remarks>
public static class BlittableValueType<T> where T : struct
public static class BlittableValueType<T>
{
#region Fields
static readonly Type Type;
static readonly int stride;
#endregion
@ -56,6 +57,12 @@ namespace OpenTK
static BlittableValueType()
{
Type = typeof(T);
if (Type.IsValueType)
{
// Does this support generic types? On Mono 2.4.3 it does
// http://msdn.microsoft.com/en-us/library/5s4920fa.aspx
stride = Marshal.SizeOf(typeof(T));
}
}
#endregion
@ -65,7 +72,7 @@ namespace OpenTK
/// <summary>
/// Gets the size of the type in bytes.
/// </summary>
public static readonly int Stride = Marshal.SizeOf(typeof(T));
public static int Stride { get { return stride; } }
#region Check
@ -103,6 +110,9 @@ namespace OpenTK
if (type.IsPrimitive)
return true;
if (!type.IsValueType)
return false;
FieldInfo[] fields = type.GetFields(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
Debug.Indent();
foreach (FieldInfo field in fields)
@ -151,7 +161,7 @@ namespace OpenTK
/// Checks whether type is a blittable value type.
/// </summary>
/// <param name="type">An instance of the type to check.</param>
public static bool Check<T>(T type) where T : struct
public static bool Check<T>(T type)
{
return BlittableValueType<T>.Check();
}
@ -160,7 +170,7 @@ namespace OpenTK
/// Checks whether type is a blittable value type.
/// </summary>
/// <param name="type">An instance of the type to check.</param>
public static bool Check<T>(T[] type) where T : struct
public static bool Check<T>(T[] type)
{
return BlittableValueType<T>.Check();
}
@ -169,7 +179,7 @@ namespace OpenTK
/// Checks whether type is a blittable value type.
/// </summary>
/// <param name="type">An instance of the type to check.</param>
public static bool Check<T>(T[,] type) where T : struct
public static bool Check<T>(T[,] type)
{
return BlittableValueType<T>.Check();
}
@ -178,7 +188,7 @@ namespace OpenTK
/// Checks whether type is a blittable value type.
/// </summary>
/// <param name="type">An instance of the type to check.</param>
public static bool Check<T>(T[, ,] type) where T : struct
public static bool Check<T>(T[, ,] type)
{
return BlittableValueType<T>.Check();
}
@ -188,14 +198,14 @@ namespace OpenTK
/// </summary>
/// <param name="type">An instance of the type to check.</param>
[CLSCompliant(false)]
public static bool Check<T>(T[][] type) where T : struct
public static bool Check<T>(T[][] type)
{
return BlittableValueType<T>.Check();
}
#endregion
#region From
#region StrideOf
/// <summary>
/// Returns the size of the specified value type in bytes.
@ -205,7 +215,6 @@ namespace OpenTK
/// <returns>An integer, specifying the size of the type in bytes.</returns>
/// <exception cref="System.ArgumentException">Occurs when type is not blittable.</exception>
public static int StrideOf<T>(T type)
where T : struct
{
if (!Check(type))
throw new ArgumentException("type");
@ -221,7 +230,6 @@ namespace OpenTK
/// <returns>An integer, specifying the size of the type in bytes.</returns>
/// <exception cref="System.ArgumentException">Occurs when type is not blittable.</exception>
public static int StrideOf<T>(T[] type)
where T : struct
{
if (!Check(type))
throw new ArgumentException("type");
@ -237,7 +245,6 @@ namespace OpenTK
/// <returns>An integer, specifying the size of the type in bytes.</returns>
/// <exception cref="System.ArgumentException">Occurs when type is not blittable.</exception>
public static int StrideOf<T>(T[,] type)
where T : struct
{
if (!Check(type))
throw new ArgumentException("type");
@ -253,7 +260,6 @@ namespace OpenTK
/// <returns>An integer, specifying the size of the type in bytes.</returns>
/// <exception cref="System.ArgumentException">Occurs when type is not blittable.</exception>
public static int StrideOf<T>(T[, ,] type)
where T : struct
{
if (!Check(type))
throw new ArgumentException("type");