public static T BilinearSample <T>(T[,] data, float u, float v) where T : Software.Texel.ITexel
{
int width = data.GetLength(0), height = data.GetLength(1);
int iu = (int)(u * width - 0.5);
int iv = (int)(v * height - 0.5);
T[] samples = new T[4];
for (int i = 0; i < 4; i++)
{
samples[i] = PointSampleT(data, iu + iuvOffsets[i].X, iv + iuvOffsets[i].Y);
}
Vector2[] sampleIUVs = new Vector2[4];
for (int i = 0; i < 4; i++)
{
sampleIUVs[i] = new Vector2(
(iu + iuvOffsets[i].X + 0.5f),
(iv + iuvOffsets[i].Y + 0.5f));
}
float totalWeight = 0;
for (int i = 0; i < 4; i++)
{
float udist = Math.Max(Math.Min(Math.Abs(sampleIUVs[i].X - u * (float)width), 1), 0);
float vdist = Math.Max(Math.Min(Math.Abs(sampleIUVs[i].Y - v * (float)height), 1), 0);
float weight = Math.Min(udist, vdist);
totalWeight += weight;
samples[i] = Op.Mul(samples[i], weight);
}
return(Op.Div(Op.Add(Op.Add(samples[0], samples[1]), Op.Add(samples[2], samples[3])), totalWeight));
}
