public TrilinearTextureFilter(BitmapSource texture)
: base(texture)
{
ImageBrush brush = new ImageBrush(texture);
// Create MipMap levels - force power of two texture size
int currentHeight = MathEx.RoundUpToNextPowerOfTwo(height);
int currentWidth = MathEx.RoundUpToNextPowerOfTwo(width);
levels = new List <MipMapLevel>();
while (currentHeight > 0 && currentWidth > 0)
{
// cannonical uv length of 1 pixel
double pixelLength = 1.0 / Math.Max(currentHeight, currentWidth);
BitmapSource nextLevelTexture = TextureGenerator.RenderBrushToImageData(
brush, currentWidth, currentHeight);
// create mip map level
MipMapLevel level = new MipMapLevel(nextLevelTexture, pixelLength);
level.HasErrorEstimation = true;
levels.Add(level);
// reuse this texture brush so that filtering is recursive
brush = new ImageBrush(nextLevelTexture);
// reduce size for next level
currentHeight /= 2;
currentWidth /= 2;
}
mipmapFactor = 0;
}
/// <summary>
/// Render a brush to a buffer of given size at the current DPI setting
/// </summary>
public static Color[,] RenderBrushToColorArray(Brush b, int width, int height)
{
return(ColorOperations.ToColorArray(TextureGenerator.RenderBrushToImageData(b, width, height, Const.DpiX, Const.DpiY)));
}
