/// <summary>
/// Creates a new TextureCubemap instance with faces compatible to the given bitmap.
/// </summary>
/// <param name="bitmap">Specifies the bitmap to which the new texture will be compatible.</param>
/// <param name="texture">Outputs the newly created texture.</param>
/// <param name="levels">Specifies the number of mipmap levels.</param>
public static void CreateCompatible(Bitmap bitmap, out TextureCubemap texture, int levels = 0)
{
if (bitmap.Width != bitmap.Height)
{
throw new ArgumentException("The faces of cube map textures must be square.");
}
texture = new TextureCubemap(BitmapFormat.Get(bitmap).InternalFormat, bitmap.Width, levels);
}
/// <summary>
/// Uploads the contents of the bitmaps to all faces of the given cube map level.<br/>
/// Will result in an OpenGL error if any of the given bitmaps is incompatible with the textures storage.
/// </summary>
public static void LoadBitmap(this TextureCubemap texture, Bitmap[] bitmaps, int level = 0)
{
if (bitmaps.Length != 6)
{
throw new ArgumentException("Expected exactly 6 bitmaps for a cube map.");
}
// load all six faces
for (var face = 0; face < 6; face++)
{
texture.LoadBitmap(bitmaps[face], face, level);
}
}
/// <summary>
/// Uploads the contents of a bitmap to a single face of the given cube map level.<br/>
/// Will result in an OpenGL error if the given bitmap is incompatible with the textures storage.
/// </summary>
public static void LoadBitmap(this TextureCubemap texture, Bitmap bitmap, int face, int level = 0)
{
const TextureTarget firstFace = TextureTarget.TextureCubeMapPositiveX;
texture.Bind();
var data = LockBits(bitmap);
try
{
var map = BitmapFormat.Get(bitmap);
GL.TexSubImage2D(firstFace + face, level, 0, 0, data.Width, data.Height,
map.PixelFormat, map.PixelType, data.Scan0);
}
finally
{
bitmap.UnlockBits(data);
}
CheckError();
}
/// <summary>
/// Attaches a single face of the given cube map texture level to the an attachment point.
/// </summary>
/// <param name="target">The framebuffer target to bind to.</param>
/// <param name="attachment">The attachment point to attach to.</param>
/// <param name="texture">The texture to attach.</param>
/// <param name="face">The cube map face of the texture to attach.</param>
/// <param name="level">The level of the texture to attach.</param>
public void Attach(FramebufferTarget target, FramebufferAttachment attachment, TextureCubemap texture, int face, int level = 0)
{
Attach(target, attachment, (LayeredTexture)texture, face, level);
}
