/// <summary>
/// Allocate this RenderBuffer.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for allocation.
/// </param>
/// <param name="w">
/// A <see cref="Int32"/> that specify the width of the renderbuffer.
/// </param>
/// <param name="h">
/// A <see cref="Int32"/> that specify the height of the renderbuffer.
/// </param>
public void Allocate(GraphicsContext ctx, uint w, uint h)
{
// Allocate buffer
Gl.BindRenderbuffer(Gl.RENDERBUFFER, ObjectName);
// Define buffer storage
Gl.RenderbufferStorage(Gl.RENDERBUFFER, Pixel.GetGlInternalFormat(_InternalFormat, ctx), (int)w, (int)h);
}
/// <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.RENDERBUFFER_BINDING, out currentBinding);
Gl.BindRenderbuffer(Gl.RENDERBUFFER, ObjectName);
// Define buffer storage
Gl.RenderbufferStorage(Gl.RENDERBUFFER, Pixel.GetGlInternalFormat(_InternalFormat, ctx), (int)_Width, (int)_Height);
// Restore previous RenderBuffer binding
Gl.BindRenderbuffer(Gl.RENDERBUFFER, (uint)currentBinding);
}
/// <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);
}