/// <summary>
/// Creates a framebuffer object and its associated resources (depth and frame buffers).
/// </summary>
/// <param name="size">Specifies the size (in pixels) of the framebuffer and its associated buffers.</param>
/// <param name="attachments">Specifies the attachments to use for the frame buffer.</param>
/// <param name="format">Specifies the internal pixel format for the frame buffer.</param>
/// <param name="mipmaps">Specifies whether to build mipmaps after the frame buffer is unbound.</param>
/// <param name="filterType">Specifies the type of filtering to apply to the frame buffer when bound as a texture.</param>
/// <param name="pixelType">Specifies the pixel type to use for the underlying format of the frame buffer.</param>
public FBO(Sizei size, FramebufferAttachment[] attachments, PixelInternalFormat format, bool mipmaps = false, TextureParameter filterType = TextureParameter.Linear, PixelType pixelType = PixelType.UnsignedByte, bool renderbuffer = true, bool multisampled = false)
{
Size = size;
Attachments = attachments;
Format = format;
MipMaps = mipmaps;
Multisampled = multisampled;
// First create the framebuffer
BufferID = GL.GenFramebuffer();
GL.BindFramebuffer(FramebufferTarget.Framebuffer, BufferID);
_attachementMap = new Dictionary <FramebufferAttachment, uint>();
TextureTarget textureTarget = Multisampled ? TextureTarget.Texture2DMultisample : TextureTarget.Texture2D;
if (Attachments.Length == 1 && Attachments[0] == FramebufferAttachment.DepthAttachment)
{
// if this is a depth attachment only
TextureID = new uint[] { GL.GenTexture() };
GL.BindTexture(textureTarget, TextureID[0]);
if (Multisampled)
{
GL.TexImage2DMultisample(textureTarget, GameSettings.MultisampleLevel, Format, Size.Width, Size.Height, true);
}
else
{
GL.TexImage2D(textureTarget, 0, Format, Size.Width, Size.Height, 0, PixelFormat.DepthComponent, PixelType.Float, IntPtr.Zero);
GL.TexParameteri(textureTarget, TextureParameterName.TextureMagFilter, TextureParameter.Nearest);
GL.TexParameteri(textureTarget, TextureParameterName.TextureMinFilter, TextureParameter.Nearest);
GL.TexParameteri(textureTarget, TextureParameterName.TextureWrapS, TextureParameter.ClampToEdge);
GL.TexParameteri(textureTarget, TextureParameterName.TextureWrapT, TextureParameter.ClampToEdge);
}
GL.BindTexture(textureTarget, 0);
GL.FramebufferTexture2D(FramebufferTarget.Framebuffer, FramebufferAttachment.DepthAttachment, textureTarget, TextureID[0], 0);
GL.DrawBuffer(DrawBufferMode.None);
GL.ReadBuffer(ReadBufferMode.None);
_attachementMap.Add(FramebufferAttachment.DepthAttachment, 0);
}
else
{
// Create n texture buffers (known by the number of attachments)
TextureID = new uint[Attachments.Length];
GL.GenTextures(Attachments.Length, TextureID);
// Bind the n texture buffers to the framebuffer
for (int i = 0; i < Attachments.Length; i++)
{
GL.BindTexture(textureTarget, TextureID[i]);
if (Multisampled)
{
GL.TexImage2DMultisample(textureTarget, GameSettings.MultisampleLevel, Format, Size.Width, Size.Height, true);
}
else
{
GL.TexImage2D(textureTarget, 0, Format, Size.Width, Size.Height, 0, PixelFormat.Rgba, pixelType, IntPtr.Zero);
if (MipMaps)
{
GL.TexParameteri(textureTarget, TextureParameterName.TextureMagFilter, TextureParameter.Linear);
GL.TexParameteri(textureTarget, TextureParameterName.TextureMinFilter, TextureParameter.LinearMipMapLinear);
GL.GenerateMipmap(Multisampled ? GenerateMipmapTarget.Texture2DMultisample : GenerateMipmapTarget.Texture2D);
}
else
{
GL.TexParameteri(textureTarget, TextureParameterName.TextureMagFilter, filterType);
GL.TexParameteri(textureTarget, TextureParameterName.TextureMinFilter, filterType);
}
}
GL.BindTexture(textureTarget, 0);
GL.FramebufferTexture2D(FramebufferTarget.Framebuffer, Attachments[i], textureTarget, TextureID[i], 0);
_attachementMap.Add(Attachments[i], TextureID[i]);
}
if (renderbuffer)
{
// Create and attach a 24-bit depth buffer to the framebuffer
DepthID = GL.GenRenderbuffer();
GL.BindRenderbuffer(RenderbufferTarget.Renderbuffer, DepthID);
if (Multisampled)
{
GL.RenderbufferStorageMultisample(RenderbufferTarget.Renderbuffer, GameSettings.MultisampleLevel, PixelInternalFormat.Depth32fStencil8, Size.Width, Size.Height);
}
else
{
GL.RenderbufferStorage(RenderbufferTarget.Renderbuffer, PixelInternalFormat.Depth24Stencil8, Size.Width, Size.Height);
}
GL.BindRenderbuffer(RenderbufferTarget.Renderbuffer, 0);
GL.FramebufferRenderbuffer(FramebufferTarget.Framebuffer, FramebufferAttachment.DepthStencilAttachment, RenderbufferTarget.Renderbuffer, DepthID);
//GL.TexParameteri(textureTarget, TextureParameterName.TextureMagFilter, TextureParameter.Nearest);
//GL.TexParameteri(textureTarget, TextureParameterName.TextureMinFilter, TextureParameter.Nearest);
//GL.TexParameteri(textureTarget, TextureParameterName.TextureWrapS, TextureParameter.ClampToEdge);
//GL.TexParameteri(textureTarget, TextureParameterName.TextureWrapT, TextureParameter.ClampToEdge);
//GL.FramebufferTexture2D(FramebufferTarget.Framebuffer, FramebufferAttachment.DepthAttachment, textureTarget, DepthID, 0);
//GL.FramebufferTexture2D(FramebufferTarget.Framebuffer, FramebufferAttachment.StencilAttachment, textureTarget, DepthID, 0);
_attachementMap.Add(FramebufferAttachment.DepthStencilAttachment, DepthID);
//_attachementMap.Add(FramebufferAttachment.StencilAttachment, DepthID);
}
}
// Build the framebuffer and check for errors
FramebufferStatus status = GL.CheckFramebufferStatus(FramebufferTarget.Framebuffer);
if (status != FramebufferStatus.FramebufferComplete)
{
Console.WriteLine("Frame buffer did not compile correctly. Returned {0}, glError: {1}", status.ToString(), GL.GetError().ToString());
}
// Make sure this framebuffer is not modified from outside
GL.BindFramebuffer(FramebufferTarget.Framebuffer, 0);
// Register this framebuffer as a disposable object
ResourcesManager.AddDisposableResource(this);
}
/// <summary>
/// Validate this Framebuffer.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for validating this Framebuffer.
/// </param>
/// <exception cref="InvalidOperationException">
/// Exception thrown whenever this Framebuffer is not valid.
/// </exception>
private static void Validate(GraphicsContext ctx)
{
// Check frambuffer completeness
FramebufferStatus status = Gl.CheckFramebufferStatus(FramebufferTarget.Framebuffer);
if (status != FramebufferStatus.FramebufferComplete)
{
switch (status)
{
case FramebufferStatus.FramebufferComplete:
return; // No error
case FramebufferStatus.FramebufferUndefined:
throw new InvalidOperationException("framebuffer undefined");
case FramebufferStatus.FramebufferIncompleteAttachment:
throw new InvalidOperationException("framebuffer incomplete attachment");
case FramebufferStatus.FramebufferIncompleteMissingAttachment:
throw new InvalidOperationException("framebuffer incomplete missing attachment");
#if !MONODROID
case FramebufferStatus.FramebufferIncompleteReadBuffer:
throw new InvalidOperationException("framebuffer incomplete read buffer");
#endif
case FramebufferStatus.FramebufferUnsupported:
throw new InvalidOperationException("framebuffer unsupported");
case FramebufferStatus.FramebufferIncompleteMultisample:
throw new InvalidOperationException("framebuffer incomplete multisample");
case FramebufferStatus.FramebufferIncompleteLayerTargets:
throw new InvalidOperationException("framebuffer incomplete layer targets");
default:
throw new InvalidOperationException(String.Format("unknown error code 0x{0}", status.ToString("X8")));
}
}
}
/// <summary>
/// initializes the Fbo with <b>with</b> and <b>height</b>. You have to call that, when <see cref="FboHandle"/> less than 0 or when the size of the fbo has changed.
/// </summary>
/// <param name="Width">is the width.</param>
/// <param name="Height">is the height.</param>
public virtual void Init(int Width, int Height)
{
if (FboHandle > 0)
{
Dispose();
}
width = Width; height = Height;
ActiveTexture = GL.GetInteger(GetPName.TextureBinding2D);
if (FboHandle < 0)
{
_GenFramebuffers(1, out _Fbo[0]);
}
if (FboHandle < 0)
{
throw new System.Exception("Can not create a frame buffer");
}
_BindFramebuffer(FramebufferTarget.Framebuffer, FboHandle);
if (Depthbuffer < 0)
{
_GenRenderbuffers(1, out _Depth[0]);
}
_BindRenderbuffer(RenderbufferTarget.Renderbuffer, Depthbuffer);
GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.DepthComponent, width, height, 0, PixelFormat.DepthComponent, PixelType.UnsignedInt, IntPtr.Zero);
if (GL.GetError() != OpenTK.Graphics.OpenGL.ErrorCode.NoError)
{
Dispose();
throw new Exception("OutOf Memory");
}
// GL.RenderbufferStorage(RenderbufferTarget.Renderbuffer, RenderbufferStorage.DepthComponent16, Width, Height);
_RenderbufferStorage(RenderbufferTarget.Renderbuffer, RenderbufferStorage.DepthComponent16, Width, Height);
_BindFramebuffer(FramebufferTarget.DrawFramebuffer, FboHandle);
if (FboTexture < 0)
{
GL.GenTextures(1, _Texture);
}
GL.BindTexture(TextureTarget.Texture2D, FboTexture);
GL.TexParameterI(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, ref GL_NEAREST);
GL.TexParameterI(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, ref GL_NEAREST);
{
GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba, Width, Height, 0, PixelFormat.Rgba, PixelType.UnsignedByte, IntPtr.Zero);
_FramebufferTexture2D(FramebufferTarget.Framebuffer, FramebufferAttachment.ColorAttachment0, TextureTarget.Texture2D, FboTexture, 0);
_FramebufferRenderbuffer(FramebufferTarget.Framebuffer, FramebufferAttachment.DepthAttachment, RenderbufferTarget.Renderbuffer, Depthbuffer);
}
int status = (int)GL.CheckFramebufferStatus(FramebufferTarget.Framebuffer);
FramebufferStatus FS = (FramebufferStatus)(status - 0x8CD5);
if (FS != FramebufferStatus.FRAMEBUFFER_COMPLETE)
{
int[] FB = new int[] { 1 };
Dispose();
throw new System.Exception(FS.ToString());
}
_BindFramebuffer(FramebufferTarget.Framebuffer, 0);
_BindFramebuffer(FramebufferTarget.DrawFramebuffer, 0);
_BindRenderbuffer(RenderbufferTarget.Renderbuffer, 0);
GL.BindTexture(TextureTarget.Texture2D, ActiveTexture);
;
}