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using System;
using System.Runtime.InteropServices;
#if MONOMAC
using MonoMac.OpenGL;
#else
using OpenTK.Graphics.OpenGL;
#endif
namespace Microsoft.Xna.Framework.Graphics
{
public class VertexDeclaration : GraphicsResource
{
// Fields
internal VertexElement[] _elements;
internal int _vertexStride;
public VertexDeclaration(params VertexElement[] elements)
{
if ((elements == null) || (elements.Length == 0))
{
throw new ArgumentNullException("elements", "Elements cannot be empty");
}
else
{
VertexElement[] elementArray = (VertexElement[]) elements.Clone();
this._elements = elementArray;
this._vertexStride = getVertexStride(elementArray);
}
}
private static int getVertexStride(VertexElement[] elements)
{
int max = 0;
for (int i = 0; i < elements.Length; i++)
{
int start = elements[i].Offset + elements[i].VertexElementFormat.GetTypeSize();
if (max < start)
{
max = start;
}
}
return max;
}
public VertexDeclaration(int vertexStride, params VertexElement[] elements)
{
if ((elements == null) || (elements.Length == 0))
{
throw new ArgumentNullException("elements", "Elements cannot be empty");
}
else
{
VertexElement[] elementArray = (VertexElement[]) elements.Clone();
this._elements = elementArray;
this._vertexStride = vertexStride;
}
}
internal static VertexDeclaration FromType(Type vertexType)
{
if (vertexType == null)
{
throw new ArgumentNullException("vertexType", "Cannot be null");
}
if (!vertexType.IsValueType)
{
object[] args = new object[] { vertexType };
throw new ArgumentException("vertexType", "Must be value type");
}
IVertexType type = Activator.CreateInstance(vertexType) as IVertexType;
if (type == null)
{
object[] objArray3 = new object[] { vertexType };
throw new ArgumentException("vertexData does not inherit IVertexType");
}
VertexDeclaration vertexDeclaration = type.VertexDeclaration;
if (vertexDeclaration == null)
{
object[] objArray2 = new object[] { vertexType };
throw new Exception("VertexDeclaration cannot be null");
}
return vertexDeclaration;
}
public static void PrepareForUse(VertexDeclaration vd)
{
GLStateManager.VertexArray(true);
bool normal = false;
bool color = false;
bool texcoord = false;
foreach (var ve in vd.GetVertexElements())
{
switch (ve.VertexElementUsage)
{
case VertexElementUsage.Position:
GL.VertexPointer(
ve.VertexElementFormat.OpenGLNumberOfElements(),
ve.VertexElementFormat.OpenGLVertexPointerType(),
vd.VertexStride,
(IntPtr)ve.Offset
);
break;
case VertexElementUsage.Color:
GL.ColorPointer(
ve.VertexElementFormat.OpenGLNumberOfElements(),
ve.VertexElementFormat.OpenGLColorPointerType(),
vd.VertexStride,
(IntPtr)ve.Offset
);
color = true;
break;
case VertexElementUsage.Normal:
GL.NormalPointer(
ve.VertexElementFormat.OpenGLNormalPointerType(),
vd.VertexStride,
(IntPtr)ve.Offset
);
normal = true;
break;
case VertexElementUsage.TextureCoordinate:
GL.TexCoordPointer(
ve.VertexElementFormat.OpenGLNumberOfElements(),
ve.VertexElementFormat.OpenGLTexCoordPointerType(),
vd.VertexStride,
(IntPtr)ve.Offset
);
texcoord = true;
break;
default:
throw new NotImplementedException();
}
}
GLStateManager.TextureCoordArray(texcoord);
GLStateManager.ColorArray(color);
GLStateManager.NormalArray(normal);
}
public VertexElement[] GetVertexElements()
{
return (VertexElement[]) this._elements.Clone();
}
// Properties
public int VertexStride
{
get
{
return this._vertexStride;
}
}
}
}
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