static public Texture2D LoadBitmap(string imageName, int w, int h)
{
//
// Load a bitmap image through writeablebitmap so that we can populate our device
// texture
//
StreamResourceInfo sr = Application.GetResourceStream(new Uri(imageName, UriKind.Relative));
BitmapImage bs = new BitmapImage();
bs.SetSource(sr.Stream);
var wb = new WriteableBitmap(w, h);
ScaleTransform t = new ScaleTransform();
t.ScaleX = (double)w / (double)bs.PixelWidth;
t.ScaleY = (double)h / (double)bs.PixelHeight;
Image image = new Image();
image.Source = bs;
wb.Render(image, t);
wb.Invalidate();
Texture2D tex = new Texture2D(GraphicsDeviceManager.Current.GraphicsDevice, wb.PixelWidth, wb.PixelHeight, false, SurfaceFormat.Color);
wb.CopyTo(tex);
return tex;
}
private static Texture2D LoadBitmapAndMip(Stream stream)
{
var bs = new BitmapImage();
bs.SetSource(stream);
// Get dimensions
int w = bs.PixelWidth;
int h = bs.PixelHeight;
if ((w % 2 != 0 && w != 1) || (h % 2 != 0 && h != 1))
throw new InvalidOperationException("Bitmap must be power of 2.");
// Calculate mip levels
int mipLevels = 1;
int maxDimension = Math.Max(w, h);
while (maxDimension > 1)
{
mipLevels++;
maxDimension /= 2;
}
// Create the chain
Texture2D tex = new Texture2D(GraphicsDeviceManager.Current.GraphicsDevice, w, h, true, SurfaceFormat.Color);
// Put bitmap into a renderable image
Image image = new Image();
image.Source = bs;
// Generate mip level data
for (int level = 0; level < mipLevels; level++)
{
var wb = new WriteableBitmap(w, h);
// Scale to current mip level
ScaleTransform t = new ScaleTransform();
t.ScaleX = (double)w / (double)bs.PixelWidth;
t.ScaleY = (double)h / (double)bs.PixelHeight;
// Black out the image
for (int c = 0; c < w * h; c++)
wb.Pixels[c] = 0;
// Small mip levels are rendering as white, so don't render
if (w > 1 && h > 1)
wb.Render(image, t);
// Update WB
wb.Invalidate();
// Grab pixel data
wb.CopyTo(tex, level, null, 0, 0);
// Shrink for the next level
if (w != 1)
w /= 2;
if (h != 1)
h /= 2;
}
return tex;
}
