private void RenderbufferStorage(uint target, uint internalformat, int width, int height)
{
if (target != GL.GL_RENDERBUFFER)
{
SetLastError(ErrorCode.InvalidEnum); return;
}
if (width < 0 || maxRenderbufferSize < width)
{
SetLastError(ErrorCode.InvalidValue); return;
}
if (height < 0 || maxRenderbufferSize < height)
{
SetLastError(ErrorCode.InvalidValue); return;
}
// TODO: GL_INVALID_ENUM is generated if internalformat is not a color-renderable, depth-renderable, or stencil-renderable format.
// TODO: GL_OUT_OF_MEMORY is generated if the GL is unable to create a data store of the requested size.
Renderbuffer obj = this.currentRenderbuffers[target - GL.GL_RENDERBUFFER];
if (obj != null)
{
int bitSize = InternalFormatHelper.BitSize(internalformat);
int bytes = (bitSize % 8 == 0) ? bitSize / 8 : bitSize / 8 + 1; // TODO: any better solution?
var dataStore = new byte[width * height * bytes];
obj.Storage(internalformat, width, height, dataStore);
}
}
private void BindRenderbuffer(uint target, uint name)
{
if (target != GL.GL_RENDERBUFFER)
{
SetLastError(ErrorCode.InvalidEnum); return;
}
if ((name != 0) && (!this.renderbufferNameList.Contains(name)))
{
SetLastError(ErrorCode.InvalidOperation); return;
}
if (name == 0)
{
this.currentRenderbuffers[target - GL.GL_RENDERBUFFER] = null;
}
else
{
Dictionary <uint, Renderbuffer> dict = this.nameRenderbufferDict;
if (!dict.ContainsKey(name)) // for the first time the name is binded, we create a renderbuffer object.
{
var obj = new Renderbuffer(name);
dict.Add(name, obj);
}
this.currentRenderbuffers[target - GL.GL_RENDERBUFFER] = dict[name];
}
}
private void FramebufferRenderbuffer(BindFramebufferTarget target, uint attachmentPoint, uint renderbufferTarget, uint renderbufferName)
{
if (!Enum.IsDefined(typeof(BindFramebufferTarget), target))
{
SetLastError(ErrorCode.InvalidEnum); return;
}
if (renderbufferTarget != GL.GL_RENDERBUFFER)
{
SetLastError(ErrorCode.InvalidEnum); return;
}
// TODO: GL_INVALID_OPERATION is generated if zero is bound to target.
Dictionary <uint, Renderbuffer> dict = this.nameRenderbufferDict;
if ((renderbufferName != 0) && (!dict.ContainsKey(renderbufferName)))
{
SetLastError(ErrorCode.InvalidOperation); return;
}
Renderbuffer renderbuffer = null;
if (renderbufferName != 0)
{
if (!dict.TryGetValue(renderbufferName, out renderbuffer))
{
SetLastError(ErrorCode.InvalidOperation); return;
}
}
Framebuffer framebuffer = this.currentFramebuffer;
if (framebuffer == null)
{
return;
}
if (framebuffer.Target != target)
{
// TODO: what should I do? Or should multiple current framebufer object exist?
}
if (attachmentPoint == GL.GL_DEPTH_ATTACHMENT)
{
framebuffer.DepthbufferAttachment = renderbuffer;
}
else if (attachmentPoint == GL.GL_STENCIL_ATTACHMENT)
{
framebuffer.StencilbufferAttachment = renderbuffer;
}
else if (attachmentPoint == GL.GL_DEPTH_STENCIL_ATTACHMENT)
{
framebuffer.DepthbufferAttachment = renderbuffer;
framebuffer.StencilbufferAttachment = renderbuffer;
}
else // color attachment points.
{
if (attachmentPoint < GL.GL_COLOR_ATTACHMENT0)
{
SetLastError(ErrorCode.InvalidOperation); return;
}
uint index = attachmentPoint - GL.GL_COLOR_ATTACHMENT0;
if (framebuffer.ColorbufferAttachments.Length <= index)
{
SetLastError(ErrorCode.InvalidOperation); return;
}
framebuffer.ColorbufferAttachments[index] = renderbuffer;
}
}