/// <summary>
/// Creates a FrameBuffer that wraps a given Texture2D object. This Texture2D will not be disposed when the
/// FrameBuffer itself is disposed, unlike other constructors.
/// </summary>
public FrameBuffer(RenderContext renderContext, Texture2D wrappedTexture)
: base(renderContext)
{
Width = wrappedTexture._width;
Height = wrappedTexture._height;
Flags = FrameBufferFlags.Color;
Handle = GLHelper.CreateFrameBuffer();
GLHelper.EnsureValid(Handle);
GLHandle prevFrameBuffer = (GLHandle)GL.GetInteger(GetPName.FramebufferBinding);
GL.BindFramebuffer(FramebufferTarget.Framebuffer, Handle);
GL.FramebufferTexture2D(FramebufferTarget.Framebuffer,
FramebufferAttachment.ColorAttachment0,
TextureTarget.Texture2D,
wrappedTexture.Handle,
0);
GL.BindFramebuffer(FramebufferTarget.Framebuffer, prevFrameBuffer);
if (!IsComplete())
{
throw new InvalidOperationException();
}
}
/// <summary>
/// Creates a FrameBuffer with components depending on the FrameBufferFlags given.
/// </summary>
public FrameBuffer(RenderContext renderContext, int width, int height, FrameBufferFlags flags)
: base(renderContext)
{
Width = width;
Height = height;
Flags = flags;
Handle = GLHelper.CreateFrameBuffer();
GLHelper.EnsureValid(Handle);
// Initialize Color Component (Texture2D)
if ((Flags & FrameBufferFlags.Color) != 0)
{
ColorTexture = Texture2D.CreateEmpty(renderContext, width, height);
GLHandle prevFrameBuffer = (GLHandle)GL.GetInteger(GetPName.FramebufferBinding);
GL.BindFramebuffer(FramebufferTarget.Framebuffer, Handle);
GL.FramebufferTexture2D(FramebufferTarget.Framebuffer,
FramebufferAttachment.ColorAttachment0,
TextureTarget.Texture2D,
ColorTexture.Handle,
0);
GL.BindFramebuffer(FramebufferTarget.Framebuffer, prevFrameBuffer);
}
// Initialize Depth Component (Renderbuffer)
if ((Flags & FrameBufferFlags.Depth) != 0)
{
DepthHandle = (GLHandle)GL.GenRenderbuffer();
GLHandle prevFrameBuffer = (GLHandle)GL.GetInteger(GetPName.FramebufferBinding);
GL.BindFramebuffer(FramebufferTarget.Framebuffer, Handle);
GLHandle prevRenderBuffer = (GLHandle)GL.GetInteger(GetPName.RenderbufferBinding);
GL.BindRenderbuffer(RenderbufferTarget.Renderbuffer, DepthHandle);
GL.RenderbufferStorage(RenderbufferTarget.Renderbuffer,
RenderbufferStorage.DepthComponent,
width,
height);
GL.FramebufferRenderbuffer(FramebufferTarget.Framebuffer,
FramebufferAttachment.DepthAttachment,
RenderbufferTarget.Renderbuffer,
DepthHandle);
GL.BindFramebuffer(FramebufferTarget.Framebuffer, prevFrameBuffer);
GL.BindRenderbuffer(RenderbufferTarget.Renderbuffer, prevRenderBuffer);
}
if (!IsComplete())
{
throw new InvalidOperationException();
}
}