/// <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);
}
}
/// <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>
/// Bind this RenderSurface for reading.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> to wich associate its read result to this RenderSurface.
/// </param>
public override void BindRead(GraphicsContext ctx)
{
// Eventually unbind a framebuffer
if (ctx.Caps.GlExtensions.FramebufferObject_ARB)
{
Gl.BindFramebuffer(Gl.READ_FRAMEBUFFER, InvalidObjectName);
}
}
/// <summary>
/// Actually create this GraphicsResource resources.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for allocating resources.
/// </param>
protected override void CreateObject(GraphicsContext ctx)
{
int currentBinding;
Gl.Get(Gl.READ_FRAMEBUFFER_BINDING, out currentBinding);
Gl.BindFramebuffer(Gl.READ_FRAMEBUFFER, ObjectName);
// Restore previous Framebuffer bound
Gl.BindFramebuffer(Gl.READ_FRAMEBUFFER, (uint)currentBinding);
}
/// <summary>
/// Unbinds the framebuffer and then generates the mipmaps of each renderbuffer.
/// </summary>
public void Disable()
{
Gl.BindFramebuffer(FramebufferTarget.Framebuffer, 0);
// have to generate mipmaps here
for (int i = 0; i < Attachments.Length && mipmaps; i++)
{
Gl.BindTexture(TextureTarget.Texture2D, TextureID[i]);
Gl.GenerateMipmap(GenerateMipmapTarget.Texture2D);
}
}
/// <summary>
/// Unbinds the framebuffer and then generates the mipmaps of each renderbuffer.
/// </summary>
public void Disable()
{
// unbind this framebuffer (does not guarantee the correct framebuffer is bound)
Gl.BindFramebuffer(FramebufferTarget.Framebuffer, 0);
// have to generate mipmaps here
for (int i = 0; i < Attachments.Length && MipMaps; i++)
{
Gl.BindTexture(TextureTarget.Texture2D, TextureID[i]);
Gl.GenerateMipmap(GenerateMipmapTarget.Texture2D);
}
}
/// <summary>
/// Bind this GraphicsSurface for reading.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> to wich associate its read result to this GraphicsSurface.
/// </param>
public override void BindRead(GraphicsContext ctx)
{
// Bind this framebuffer
Gl.BindFramebuffer(Gl.READ_FRAMEBUFFER, ObjectName);
// Reset dirty binding points
for (uint i = 0; i < GraphicsContext.CurrentCaps.Limits.MaxColorAttachments; i++)
{
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;
}
}
}
/// <summary>
/// Unbind this GraphicsSurface for drawing.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> to wich disassociate its rendering result from this GraphicsSurface.
/// </param>
public override void UnbindDraw(GraphicsContext ctx)
{
// Switch to default framebuffer
Gl.BindFramebuffer(Gl.DRAW_FRAMEBUFFER, InvalidObjectName);
}
/// <summary>
/// Creates a framebuffer object and its associated resources (depth and pbuffers).
/// </summary>
/// <param name="Size">Specifies the size (in pixels) of the framebuffer and it's 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">Specified whether to build mipmaps after the frame buffer is unbound.</param>
public FBO(Size Size, FramebufferAttachment[] Attachments, PixelInternalFormat Format, bool Mipmaps)
{
this.Size = Size;
this.Attachments = Attachments;
this.Format = Format;
this.mipmaps = Mipmaps;
// First create the framebuffer
BufferID = Gl.GenFramebuffer();
Gl.BindFramebuffer(FramebufferTarget.Framebuffer, BufferID);
if (Attachments.Length == 1 && Attachments[0] == FramebufferAttachment.DepthAttachment)
{
TextureID = new uint[] { Gl.GenTexture() };
Gl.BindTexture(TextureTarget.Texture2D, TextureID[0]);
Gl.TexImage2D(TextureTarget.Texture2D, 0, Format, Size.Width, Size.Height, 0, PixelFormat.DepthComponent, PixelType.Float, IntPtr.Zero);
Gl.TexParameteri(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, TextureParameter.Nearest);
Gl.TexParameteri(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, TextureParameter.Nearest);
Gl.TexParameteri(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, TextureParameter.ClampToEdge);
Gl.TexParameteri(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, TextureParameter.ClampToEdge);
Gl.FramebufferTexture(FramebufferTarget.Framebuffer, FramebufferAttachment.DepthAttachment, TextureID[0], 0);
Gl.DrawBuffer(DrawBufferMode.None);
Gl.ReadBuffer(ReadBufferMode.None);
}
else
{
// Create and attach a 24-bit depth buffer to the framebuffer
DepthID = Gl.GenRenderbuffer();
Gl.BindRenderbuffer(RenderbufferTarget.Renderbuffer, DepthID);
Gl.RenderbufferStorage(RenderbufferTarget.Renderbuffer, RenderbufferStorage.DepthComponent24, Size.Width, Size.Height);
// 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.Texture2D, TextureID[i]);
Gl.TexImage2D(TextureTarget.Texture2D, 0, Format, Size.Width, Size.Height, 0, PixelFormat.Rgba, PixelType.UnsignedByte, IntPtr.Zero);
if (Mipmaps)
{
Gl.TexParameteri(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, TextureParameter.Linear);
Gl.TexParameteri(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, TextureParameter.LinearMipMapLinear);
Gl.GenerateMipmap(GenerateMipmapTarget.Texture2D);
}
Gl.FramebufferTexture(FramebufferTarget.Framebuffer, Attachments[i], TextureID[i], 0);
}
// Build the framebuffer and check for errors
Gl.FramebufferRenderbuffer(FramebufferTarget.Framebuffer, FramebufferAttachment.DepthAttachment, RenderbufferTarget.Renderbuffer, DepthID);
}
FramebufferErrorCode status = Gl.CheckFramebufferStatus(FramebufferTarget.Framebuffer);
if (status != FramebufferErrorCode.FramebufferComplete)
{
Console.WriteLine("Frame buffer did not compile correctly. Returned {0}, glError: {1}", status.ToString(), Gl.GetError().ToString());
}
Gl.BindFramebuffer(FramebufferTarget.Framebuffer, 0);
}
public void Use() => Gl.BindFramebuffer(Gl.FrameBuffer, _hdc);
public static void UseDefault() => Gl.BindFramebuffer(Gl.FrameBuffer, 0);
