protected BufferObject InitializeArrayBuffer(uint index, int components, VertexAttribPointerType type, bool normalized,
int stride, int offset, BufferUsageHint hint)
{
if (index < 0 || index >= ArrayBufferObjects.Length)
{
throw new IndexOutOfRangeException(
"Index must be within range of the number of array buffer objects for this vertex buffer!");
}
if (ArrayBufferObjects[index] != null)
{
throw new InvalidOperationException(
string.Format("ArrayBuffer {0} was already initialized for this vertex buffer!", index));
}
GLError.Begin();
BufferObject buffer = new BufferObject(BufferTarget.ArrayBuffer, hint);
buffer.Bind();
GL.VertexAttribPointer(index, components, type, normalized, stride, new IntPtr(offset));
GL.EnableVertexAttribArray(index);
ErrorCode err = GLError.End();
if (err != ErrorCode.NoError)
{
throw new Exception(string.Format("Failed to initialize array buffer: {0}", err));
}
ArrayBufferObjects[index] = buffer;
return(buffer);
}
protected BufferObject InitializeElementBuffer(BufferUsageHint hint)
{
if (ElementBuffer != null)
{
throw new InvalidOperationException("This vertex buffer already has an element buffer!");
}
ElementBuffer = new BufferObject(BufferTarget.ElementArrayBuffer, hint);
ElementBuffer.Bind();
return(ElementBuffer);
}