private uint CheckFramebufferStatus(BindFramebufferTarget target)
{
if (!Enum.IsDefined(typeof(BindFramebufferTarget), target))
{
SetLastError(ErrorCode.InvalidEnum); return(0);
}
// TODO: check this framebuffer.
return(GL.GL_FRAMEBUFFER_COMPLETE);
}
private void BindFramebuffer(BindFramebufferTarget target, uint name)
{
if (!Enum.IsDefined(typeof(BindFramebufferTarget), target))
{
SetLastError(ErrorCode.InvalidEnum); return;
}
if ((name != 0) && (!this.framebufferNameList.Contains(name)))
{
SetLastError(ErrorCode.InvalidOperation); return;
}
Dictionary <uint, Framebuffer> dict = this.nameFramebufferDict;
if (!dict.ContainsKey(name)) // for the first time the name is binded, we create a framebuffer object.
{
var obj = new Framebuffer(name);
dict.Add(name, obj);
}
Framebuffer fbo = dict[name];
fbo.Target = target;
this.currentFramebuffer = fbo;
}
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;
}
}
