/// <summary>
/// Initializes a new instance of the <see cref="FBO"/> class.
/// </summary>
/// <param name="size"></param>
/// <exception cref="FBOException">
/// Given texture is null or texture dimensions do not match primary texture
/// </exception>
public CubeMapFBO(int size)
{
_size = size;
// Create an FBO object
GL.GenFramebuffers(1, out _fboHandle);
Texture = new Texture(TextureTarget.TextureCubeMap);
//Initialize empty textures in texture
Texture.Activate();
for (int i = 0; i < 6; i++)
{
GL.TexImage2D(TextureTarget.TextureCubeMapPositiveX + i, 0, PixelInternalFormat.Rgba32f, size, size, 0, PixelFormat.Rgba, PixelType.Float, IntPtr.Zero);
}
Texture.Deactivate();
//Bind texture to framebuffer
Activate();
for (int i = 0; i < 6; i++)
{
GL.FramebufferTexture2D(FramebufferTarget.Framebuffer, FramebufferAttachment.ColorAttachment0 + i, TextureTarget.TextureCubeMapPositiveX + i, Texture.ID, 0);
}
string status = GetStatusMessage();
Deactivate();
if (!string.IsNullOrEmpty(status))
{
throw new FBOException(status);
}
//Attach depth
Activate();
_depth = new RenderBuffer(RenderbufferStorage.DepthComponent32, _size, _size);
_depth.Attach(FramebufferAttachment.DepthAttachment);
status = GetStatusMessage();
Deactivate();
if (!string.IsNullOrEmpty(status))
{
throw new FBOException(status);
}
int linMin = (int)TextureMinFilter.LinearMipmapLinear;
int linMag = (int)TextureMagFilter.Linear;
int clampToEdge = (int)TextureWrapMode.ClampToEdge;
Texture.Activate();
GL.TexParameterI(TextureTarget.TextureCubeMap, TextureParameterName.TextureMinFilter, ref linMin);
GL.TexParameterI(TextureTarget.TextureCubeMap, TextureParameterName.TextureMagFilter, ref linMag);
GL.TexParameterI(TextureTarget.TextureCubeMap, TextureParameterName.TextureWrapS, ref clampToEdge);
GL.TexParameterI(TextureTarget.TextureCubeMap, TextureParameterName.TextureWrapT, ref clampToEdge);
GL.TexParameterI(TextureTarget.TextureCubeMap, TextureParameterName.TextureWrapR, ref clampToEdge);
Texture.Deactivate();
}