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using System;
using OpenTK;
using OpenTK.Graphics.OpenGL;
namespace Crow
{
public class VertexArrayObject : IDisposable
{
public int vaoHandle,
positionVboHandle,
texVboHandle,
eboHandle;
Vector2[] positionVboData;
public int[] indicesVboData;
Vector2[] texVboData;
public VertexArrayObject (Vector2[] _positions, Vector2[] _texCoord, int[] _indices)
{
positionVboData = _positions;
texVboData = _texCoord;
indicesVboData = _indices;
CreateVBOs ();
CreateVAOs ();
}
void deleteVAOs()
{
GL.DeleteBuffer (positionVboHandle);
GL.DeleteBuffer (texVboHandle);
GL.DeleteBuffer (eboHandle);
GL.DeleteVertexArray (vaoHandle);
}
void CreateVBOs()
{
positionVboHandle = GL.GenBuffer();
GL.BindBuffer(BufferTarget.ArrayBuffer, positionVboHandle);
GL.BufferData<Vector2>(BufferTarget.ArrayBuffer,
new IntPtr(positionVboData.Length * Vector2.SizeInBytes),
positionVboData, BufferUsageHint.StaticDraw);
texVboHandle = GL.GenBuffer();
GL.BindBuffer(BufferTarget.ArrayBuffer, texVboHandle);
GL.BufferData<Vector2>(BufferTarget.ArrayBuffer,
new IntPtr(texVboData.Length * Vector2.SizeInBytes),
texVboData, BufferUsageHint.StaticDraw);
//
eboHandle = GL.GenBuffer();
GL.BindBuffer(BufferTarget.ElementArrayBuffer, eboHandle);
GL.BufferData(BufferTarget.ElementArrayBuffer,
new IntPtr(sizeof(uint) * indicesVboData.Length),
indicesVboData, BufferUsageHint.StaticDraw);
GL.BindBuffer(BufferTarget.ArrayBuffer, 0);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, 0);
}
void CreateVAOs()
{
vaoHandle = GL.GenVertexArray();
GL.BindVertexArray(vaoHandle);
GL.EnableVertexAttribArray(0);
GL.BindBuffer(BufferTarget.ArrayBuffer, positionVboHandle);
GL.VertexAttribPointer(0, 2, VertexAttribPointerType.Float, true, Vector2.SizeInBytes, 0);
GL.EnableVertexAttribArray(1);
GL.BindBuffer(BufferTarget.ArrayBuffer, texVboHandle);
GL.VertexAttribPointer(1, 2, VertexAttribPointerType.Float, true, Vector2.SizeInBytes, 0);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, eboHandle);
GL.BindVertexArray(0);
}
public void Render(PrimitiveType _primitiveType){
GL.BindVertexArray(vaoHandle);
GL.DrawElements(_primitiveType, indicesVboData.Length,
DrawElementsType.UnsignedInt, IntPtr.Zero);
GL.BindVertexArray (0);
}
#region IDisposable implementation
public void Dispose ()
{
deleteVAOs ();
}
#endregion
}
}
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