public static RaytracerTexture2d FromUnityMipLayer(Texture2D unityTexture, int mipLevel)
{
if (mipLevel < 0 || mipLevel >= unityTexture.mipmapCount)
{
throw new ArgumentOutOfRangeException(
"mipLevel", mipLevel,
string.Format(
"Mip level for given texture must be in range from 0 to {0} inclusively",
unityTexture.mipmapCount - 1
)
);
}
int width = Math.Max(1, unityTexture.width >> mipLevel);
int height = Math.Max(1, unityTexture.height >> mipLevel);
var texture = new RaytracerTexture2d(width, height);
Color [] pixelsFlat = unityTexture.GetPixels(mipLevel);
int i = 0;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++, i++)
{
texture.pixels [y, x] = pixelsFlat [i];
}
}
texture.WrapMode = unityTexture.wrapMode;
texture.FilterMode = unityTexture.filterMode;
return(texture);
}
public static RaytracerTexture2d FromUnityTexture(Texture2D unityTexture)
{
RaytracerTexture2d texture;
if (!cache.TryGetValue(unityTexture, out texture))
{
texture = RaytracerTexture2d.FromUnityTexture(unityTexture);
cache [unityTexture] = texture;
}
return(texture);
}
public static RaytracerTexture2d FromUnityTexture(Texture2D unityTexture)
{
var mipLayers = new RaytracerTexture2d [unityTexture.mipmapCount];
for (int mipLevel = 0; mipLevel < unityTexture.mipmapCount; mipLevel++)
{
var mipLayer = FromUnityMipLayer(unityTexture, mipLevel);
mipLayers [mipLevel] = mipLayer;
}
var zeroLevelTexture = mipLayers [0];
zeroLevelTexture.mipLayers = mipLayers;
return(zeroLevelTexture);
}
