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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
using OpenTK.Graphics.OpenGL;
namespace Microsoft.Xna.Framework.Graphics
{
public class VertexBuffer : IDisposable
{
private GraphicsDevice Graphics;
internal Type _type;
private int _vertexCount;
private BufferUsage _bufferUsage;
internal object _buffer = null;
internal IntPtr _bufferPtr;
internal int _bufferIndex = 0;
internal int _size;
internal static int _bufferCount = 0;
internal uint _bufferStore;
// allow for 50 buffers initially
internal static VertexBuffer[] _allBuffers = new VertexBuffer[50];
internal static List<Action> _delayedBufferDelegates = new List<Action> ();
public VertexBuffer (GraphicsDevice Graphics,Type type,int vertexCount,BufferUsage bufferUsage)
{
this.Graphics = Graphics;
this._type = type;
this._vertexCount = vertexCount;
this._bufferUsage = bufferUsage;
}
public VertexBuffer (GraphicsDevice Graphics,VertexDeclaration vertexDecs,int vertexCount,BufferUsage bufferUsage)
: this (Graphics, vertexDecs.GetType(), vertexCount, bufferUsage)
{
}
public int VertexCount { get; set; }
internal static void CreateFrameBuffers ()
{
foreach (var action in _delayedBufferDelegates)
action.Invoke ();
_delayedBufferDelegates.Clear ();
}
//internal void GenerateBuffer<T>() where T : struct, IVertexType
internal void GenerateBuffer<T> () where T : struct
{
var vd = VertexDeclaration.FromType (_type);
_size = vd.VertexStride * ((T[])_buffer).Length;
BufferUsageHint bufferUsage = (_bufferUsage == BufferUsage.WriteOnly) ? BufferUsageHint.StaticDraw : BufferUsageHint.DynamicDraw;
GL.GenBuffers (1, out _bufferStore);
GL.BindBuffer (BufferTarget.ArrayBuffer, _bufferStore);
GL.BufferData<T> (BufferTarget.ArrayBuffer, (IntPtr)_size, (T[])_buffer, bufferUsage);
}
public unsafe void GetData<T> (T[] vertices) where T : IVertexType
{
if (_buffer == null)
throw new Exception ("Can't get data on an empty buffer");
var _tbuff = (T[])_buffer;
for (int i = 0; i < _tbuff.Length; i++)
vertices [i] = _tbuff [i];
}
//public unsafe void SetData<T>(T[] vertices) where T : struct, IVertexType
public unsafe void SetData<T> (T[] vertices) where T : struct
{
//the creation of the buffer should mb be moved to the constructor and then glMapBuffer and Unmap should be used to update it
//glMapBuffer - sets data
//glUnmapBuffer - finished setting data
_buffer = vertices;
_bufferPtr = GCHandle.Alloc (_buffer, GCHandleType.Pinned).AddrOfPinnedObject ();
_bufferIndex = _bufferCount + 1;
_allBuffers [_bufferIndex] = this;
_delayedBufferDelegates.Add (GenerateBuffer<T>);
_bufferCount++;
// TODO: Kill buffers in PhoneOSGameView.DestroyFrameBuffer()
}
public void Dispose ()
{
GL.GenBuffers (0, out _bufferStore);
}
public bool IsContentLost {
get {
return Graphics.IsContentLost;
}
}
}
public class DynamicVertexBuffer : VertexBuffer
{
public DynamicVertexBuffer (GraphicsDevice graphics, Type type, int vertexCount, BufferUsage bufferUsage)
: base(graphics, type, vertexCount, bufferUsage)
{
}
public DynamicVertexBuffer (GraphicsDevice graphics, VertexDeclaration vertexDecs, int vertexCount, BufferUsage bufferUsage)
: base (graphics,vertexDecs.GetType(), vertexCount,bufferUsage)
{
}
}
}
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