/// <summary>
/// Bind this GraphicsSurface for drawing.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> to wich associate its rendering result to this GraphicsSurface.
/// </param>
public override void BindDraw(GraphicsContext ctx)
{
// Bind this framebuffer
Gl.BindFramebuffer(Gl.DRAW_FRAMEBUFFER, ObjectName);
List <int> drawBuffers = new List <int>();
for (uint i = 0; i < GraphicsContext.CurrentCaps.Limits.MaxColorAttachments; i++)
{
// Reset dirty binding points
if ((_ColorBuffers[i] != null) && _ColorBuffers[i].Dirty)
{
// Ensure created buffer
_ColorBuffers[i].Create(ctx);
// Ensure attached buffer
_ColorBuffers[i].Attach(Gl.DRAW_FRAMEBUFFER, Gl.COLOR_ATTACHMENT0 + (int)i);
_ColorBuffers[i].Dirty = false;
}
// Collect draw buffers
if (_ColorBuffers[i] != null)
{
drawBuffers.Add(Gl.COLOR_ATTACHMENT0 + (int)i);
}
}
// Validate completeness status
Validate(ctx);
// Update draw buffers
Gl.DrawBuffers(drawBuffers.ToArray());
}
/// <summary>
/// Binds the framebuffer and all of the renderbuffers.
/// Clears the buffer bits and sets viewport size.
/// Perform all rendering after this call.
/// </summary>
public void Enable()
{
Gl.BindFramebuffer(FramebufferTarget.Framebuffer, BufferID);
if (Attachments.Length == 1)
{
Gl.BindTexture(TextureTarget.Texture2D, TextureID[0]);
Gl.FramebufferTexture(FramebufferTarget.Framebuffer, Attachments[0], TextureID[0], 0);
}
else
{
DrawBuffersEnum[] buffers = new DrawBuffersEnum[Attachments.Length];
for (int i = 0; i < Attachments.Length; i++)
{
Gl.BindTexture(TextureTarget.Texture2D, TextureID[i]);
Gl.FramebufferTexture(FramebufferTarget.Framebuffer, Attachments[i], TextureID[i], 0);
buffers[i] = (DrawBuffersEnum)Attachments[i];
}
if (Attachments.Length > 1)
{
Gl.DrawBuffers(Attachments.Length, buffers);
}
}
Gl.Viewport(0, 0, Size.Width, Size.Height);
if (Attachments.Length == 1 && Attachments[0] == FramebufferAttachment.DepthAttachment)
{
Gl.Clear(ClearBufferMask.DepthBufferBit);
}
else
{
Gl.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
}
}