public static void StencilBilinearSample(this Serializable2DFloatArray array, Vector2 normalizedCoord, out float strength, bool ignoreNegativeKeys = true)
{
if (normalizedCoord.x < 0 || normalizedCoord.x > 1 || normalizedCoord.y < 0 || normalizedCoord.y > 1)
{
strength = 0;
return;
}
normalizedCoord = new Vector2(normalizedCoord.x * array.Width, normalizedCoord.y * array.Height);
int xMin = Mathf.FloorToInt(normalizedCoord.x);
int xMax = Mathf.CeilToInt(normalizedCoord.x);
int yMin = Mathf.FloorToInt(normalizedCoord.y);
int yMax = Mathf.CeilToInt(normalizedCoord.y);
xMin = Mathf.Clamp(xMin, 0, array.Width - 1);
xMax = Mathf.Clamp(xMax, 0, array.Width - 1);
yMin = Mathf.Clamp(yMin, 0, array.Height - 1);
yMax = Mathf.Clamp(yMax, 0, array.Height - 1);
float v1 = array[xMin, yMin];
float v2 = array[xMin, yMax];
float v3 = array[xMax, yMin];
float v4 = array[xMax, yMax];
int v1Index;
int v2Index;
int v3Index;
int v4Index;
MiscUtilities.DecompressStencil(v1, out v1Index, out v1);
MiscUtilities.DecompressStencil(v2, out v2Index, out v2);
MiscUtilities.DecompressStencil(v3, out v3Index, out v3);
MiscUtilities.DecompressStencil(v4, out v4Index, out v4);
if (ignoreNegativeKeys)
{
v1 = v1Index > 0 ? v1 : 0;
v2 = v1Index > 0 ? v2 : 0;
v3 = v1Index > 0 ? v3 : 0;
v4 = v1Index > 0 ? v4 : 0;
}
if (Math.Abs(v1 + v2 + v3 + v4) < .01f)
{
strength = 0;
return;
}
float xFrac = normalizedCoord.x.Frac();
float yFrac = normalizedCoord.y.Frac();
v1 *= (1 - xFrac) * (1 - yFrac);
v2 *= (1 - xFrac) * (/*1 - */ yFrac);
v3 *= (/*1 - */ xFrac) * (1 - yFrac);
v4 *= (/*1 - */ xFrac) * (/*1 -*/ yFrac);
strength = Mathf.Clamp01(v1 + v2 + v3 + v4);
}
public static void ColoriseStencil(Serializable2DFloatArray stencil)
{
for (var u = 0; u < stencil.Width; ++u)
{
for (var v = 0; v < stencil.Height; ++v)
{
int key;
float strength;
DecompressStencil(stencil[u, v], out key, out strength);
if (strength > 0 && key > 0)
{
stencil[u, v] = MiscUtilities.CompressStencil(key, 1);
}
else
{
stencil[u, v] = 0;
}
}
}
}
