/// <summary>
/// Standard constructor for vertex buffers
/// </summary>
/// <param name="desc">VertexBufferDescriptor which describes each element in the structure T</param>
/// <exception cref="InvalidCastException">Throws InvalidCastException if VertexBufferDescriptor describes anything other that T
/// </exception>
public VertexBuffer(VertexBufferDescriptor desc)
: base()
{
uint[] arr = new uint[1];
OpenGL.glGenVertexArrays(1, arr);
vertex_array = arr[0];
target = (uint)VboTarget.GL_ARRAY_BUFFER;
if (typeof(T) != desc.Type)
{
throw new InvalidCastException("Vertex buffer descriptor does not describe contained type");
}
this.desc = desc;
int offset = 0;
int tot_size = desc.Types.Count() == 1 ? 0 : desc.TotalSize;
initialize = new List <Action <VertexBuffer <T> .ElementInfo> >();
elements = new List <VertexBuffer <T> .ElementInfo>();
types = new List <uint>();
uint gl_datatype = 0;
foreach (var el in desc.Types)
{
int tt = (int)el;
ElementType type;
int size;
ElementType data_type;
data_type = (ElementType)(tt & 0x00003000);
type = (ElementType)(tt & 0xf);
int dim = (tt & 0x00000ff0) >> 4;
int bits = ((tt & 0x00ff0000) >> 16);
size = dim * bits;
uint ch = ((uint)el & 0xff000000) >> 24;
if (bits == 2 && data_type == ElementType.Integer)
{
gl_datatype = (uint)OpenGL.Const.GL_SHORT;
}
else if (bits == 4 && data_type == ElementType.Integer)
{
gl_datatype = (uint)OpenGL.Const.GL_INT;
}
else if (bits == 2 && data_type == ElementType.Float)
{
gl_datatype = OpenGL.Const.GL_HALF_FLOAT;
}
else if (bits == 4 && data_type == ElementType.Float)
{
gl_datatype = (uint)OpenGL.Const.GL_FLOAT;
}
else if (bits == 8 && data_type == ElementType.Float)
{
gl_datatype = (uint)OpenGL.Const.GL_DOUBLE;
}
elements.Add(new VertexBuffer <T> .ElementInfo()
{
dimensions = dim,
gl_type = gl_datatype,
offset_value = new IntPtr(offset),
channel = ch,
attribute = 0xffffffff
});
/*switch (type)
* {
* case ElementType.Position:
* initialize.Add(new Action<ElementInfo>(SetVertexPointer));
* types.Add(OpenGL.Const.GL_VERTEX_ARRAY);
* break;
* case ElementType.Normals:
* initialize.Add(new Action<ElementInfo>(SetNormalPointer));
* types.Add(OpenGL.Const.GL_NORMAL_ARRAY);
* break;
* case ElementType.TexCoord:
* initialize.Add(new Action<ElementInfo>(SetTexCoordPointer));
* types.Add(OpenGL.Const.GL_TEXTURE_COORD_ARRAY);
* break;
* case ElementType.Color:
* initialize.Add(new Action<ElementInfo>(SetColorPointer));
* types.Add(OpenGL.Const.GL_COLOR_ARRAY);
* break;
* default:
* initialize.Add(null);
* types.Add(0);
* break;
*
* }*/
offset += size;
}
}
