/// <summary>
/// Unbinds the renderbuffer.
/// <para>The renderbuffer will remain internally attached to the framebuffer.</para>
/// </summary>
internal void Unbind()
{
if (info == null)
{
return;
}
// Return the renderbuffer to the cache
renderBufferCache[Format].Push(info);
info = null;
}
/// <summary>
/// Binds the renderbuffer to the specfied framebuffer.
/// </summary>
/// <param name="frameBuffer">The framebuffer this renderbuffer should be bound to.</param>
internal void Bind(int frameBuffer)
{
// Check if we're already bound
if (info != null)
{
return;
}
if (!renderBufferCache.ContainsKey(Format))
{
renderBufferCache[Format] = new Stack <RenderBufferInfo>();
}
// Make sure we have renderbuffers available
if (renderBufferCache[Format].Count == 0)
{
renderBufferCache[Format].Push(new RenderBufferInfo()
{
RenderBufferID = GL.GenRenderbuffer(), FrameBufferID = -1
});
}
// Get a renderbuffer from the cache
info = renderBufferCache[Format].Pop();
// Check if we need to update the size
if (info.Size != Size)
{
GL.BindRenderbuffer(RenderbufferTarget.Renderbuffer, info.RenderBufferID);
GL.RenderbufferStorage(RenderbufferTarget.Renderbuffer, Format, (int)Math.Ceiling(Size.X), (int)Math.Ceiling(Size.Y));
info.Size = Size;
}
// For performance reasons, we only need to re-bind the renderbuffer to
// the framebuffer if it is not already attached to it
if (info.FrameBufferID != frameBuffer)
{
// Make sure the framebuffer we want to attach to is bound
int lastFrameBuffer = GLWrapper.BindFrameBuffer(frameBuffer);
switch (Format)
{
case RenderbufferInternalFormat.DepthComponent16:
GL.FramebufferRenderbuffer(FramebufferTarget.Framebuffer, FramebufferSlot.DepthAttachment, RenderbufferTarget.Renderbuffer, info.RenderBufferID);
break;
case RenderbufferInternalFormat.Rgb565:
case RenderbufferInternalFormat.Rgb5A1:
case RenderbufferInternalFormat.Rgba4:
GL.FramebufferRenderbuffer(FramebufferTarget.Framebuffer, FramebufferSlot.ColorAttachment0, RenderbufferTarget.Renderbuffer, info.RenderBufferID);
break;
case RenderbufferInternalFormat.StencilIndex8:
GL.FramebufferRenderbuffer(FramebufferTarget.Framebuffer, FramebufferSlot.DepthAttachment, RenderbufferTarget.Renderbuffer, info.RenderBufferID);
break;
}
GLWrapper.BindFrameBuffer(lastFrameBuffer);
}
info.FrameBufferID = frameBuffer;
}
