public UniformBuffer(int size, int stride, Type type)
{
if (stride % 16 != 0)
{
throw new Exception("Must be aligned to minimum 16");
}
this.stride = stride;
this.size = size;
storageType = type;
ID = GL.GenBuffer();
GLBind.UniformBuffer(ID);
GL.BufferData(GL.GL_UNIFORM_BUFFER, new IntPtr(size * stride), IntPtr.Zero, GL.GL_STREAM_DRAW);
GL.GetIntegerv(GL.GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT, out int align);
var lval = stride % align;
if (lval == 0)
{
gAlignment = 0;
}
else
{
gAlignment = align;
}
#if DEBUG
if (align < 256 && 256 % align != 0)
{
gAlignment = 256; //Set larger alignment on debug for testing
}
#endif
if (align < stride && lval != 0)
{
throw new Exception("Platform has incompatible alignment");
}
}
public UniformBuffer(int size, int stride, Type type)
{
this.stride = stride;
this.size = size;
storageType = type;
ID = GL.GenBuffer();
GLBind.UniformBuffer(ID);
GL.BufferData(GL.GL_UNIFORM_BUFFER, new IntPtr(size * stride), IntPtr.Zero, GL.GL_STREAM_DRAW);
}
public void SetData <T>(T[] array, int start = 0, int length = -1) where T : struct
{
if (typeof(T) != storageType)
{
throw new InvalidOperationException();
}
var len = length < 0 ? array.Length : length;
GLBind.UniformBuffer(ID);
var handle = GCHandle.Alloc(array, GCHandleType.Pinned);
GL.BufferSubData(GL.GL_UNIFORM_BUFFER, (IntPtr)(start * stride), (IntPtr)(len * stride), handle.AddrOfPinnedObject());
handle.Free();
}
