public static void PackChannels(this Texture2D mask, Texture2D[] textures, TexturePackingSettings[] settings = null, bool generateOnGPU = true)
{
if (textures == null || textures.Length != 4)
{
Debug.LogError("Invalid parameter to PackChannels. An array of 4 textures is expected");
}
if (settings == null)
{
settings = new TexturePackingSettings[4];
for (int i = 0; i < settings.Length; ++i)
{
settings[i].invertColor = false;
}
}
int width = mask.width;
int height = mask.height;
int pixelCount = width * height;
bool invalidTextures = false;
for (int i = 0; i < textures.Length; i++)
{
var t = textures[i];
if (t != null)
{
if (!generateOnGPU && !t.isReadable)
{
Debug.LogError($"SmartTexture Aborting: {t.name} texture is not readable so we cannot import on CPU. Toogle Read/Write Enable in texture importer. ", t);
invalidTextures = true;
}
if (t.width != width || t.height != height)
{
Debug.LogWarning($"SmartTexture: {t.name} does not match expected size. This can cause artfacts as the texture will be sampled onto a different size target, mismatches are not advised", t);
}
if (CompressedTextureFormat(t.format))
{
Debug.LogWarning($"SmartTexture: {t.name} is already compressed, channel {i} will be double compressed. Please use an uncompressed format, input texture size isn't relevant to the build", t);
}
}
}
if (invalidTextures)
{
return;
}
if (generateOnGPU)
{
float[] invertColor =
{
settings[0].invertColor ? 1.0f : 0.0f,
settings[1].invertColor ? 1.0f : 0.0f,
settings[2].invertColor ? 1.0f : 0.0f,
settings[3].invertColor ? 1.0f : 0.0f,
};
packChannelMaterial.SetTexture("_RedChannel", textures[0] != null ? textures[0] : Texture2D.blackTexture);
packChannelMaterial.SetTexture("_GreenChannel", textures[1] != null ? textures[1] : Texture2D.blackTexture);
packChannelMaterial.SetTexture("_BlueChannel", textures[2] != null ? textures[2] : Texture2D.blackTexture);
packChannelMaterial.SetTexture("_AlphaChannel", textures[3] != null ? textures[3] : Texture2D.blackTexture);
packChannelMaterial.SetVector("_InvertColor", new Vector4(invertColor[0], invertColor[1], invertColor[2], invertColor[3]));
var rt = RenderTexture.GetTemporary(width, height, 0, RenderTextureFormat.ARGB32,
RenderTextureReadWrite.Linear);
RenderTexture previous = RenderTexture.active;
RenderTexture.active = rt;
CommandBuffer cmd = new CommandBuffer();
cmd.Blit(null, rt, packChannelMaterial);
cmd.SetRenderTarget(BuiltinRenderTextureType.CameraTarget);
Graphics.ExecuteCommandBuffer(cmd);
mask.ReadPixels(new Rect(0, 0, width, height), 0, 0);
mask.Apply();
RenderTexture.active = previous;
RenderTexture.ReleaseTemporary(rt);
}
else
{
Color[][] pixels =
{
textures[0] != null ? textures[0].GetPixels(0) : null,
textures[1] != null ? textures[1].GetPixels(0) : null,
textures[2] != null ? textures[2].GetPixels(0) : null,
textures[3] != null ? textures[3].GetPixels(0) : null,
};
Color[] maskPixels = new Color[pixelCount];
for (int i = 0; i < pixelCount; ++i)
{
float r = (textures[0] != null) ? pixels[0][i].r : 0.0f;
float g = (textures[1] != null) ? pixels[1][i].r : 0.0f;
float b = (textures[2] != null) ? pixels[2][i].r : 0.0f;
float a = (textures[3] != null) ? pixels[3][i].r : 0.0f;
if (settings[0].invertColor)
{
r = 1.0f - r;
}
if (settings[1].invertColor)
{
g = 1.0f - g;
}
if (settings[2].invertColor)
{
b = 1.0f - b;
}
if (settings[3].invertColor)
{
a = 1.0f - a;
}
maskPixels[i] = new Color(r, g, b, a);
}
mask.SetPixels(maskPixels, 0);
mask.Apply();
}
}
public static void PackChannels(this Texture2D mask, Texture2D[] textures, TexturePackingSettings[] settings = null, bool generateOnGPU = true)
{
if (textures == null || textures.Length != 4)
{
Debug.LogError("Invalid parameter to PackChannels. An array of 4 textures is expected");
}
if (settings == null)
{
settings = new TexturePackingSettings[4];
for (int i = 0; i < settings.Length; ++i)
{
settings[i].invertColor = false;
}
}
int width = mask.width;
int height = mask.height;
int pixelCount = width * height;
foreach (Texture2D t in textures)
{
if (t != null)
{
if (!generateOnGPU && !t.isReadable)
{
Debug.LogError(t + " texture is not readable. Toogle Read/Write Enable in texture importer. ");
return;
}
if (t.width != width || t.height != height)
{
Debug.LogError(t + " input textures must have the same size.");
return;
}
}
}
if (generateOnGPU)
{
float[] invertColor =
{
settings[0].invertColor ? 1.0f : 0.0f,
settings[1].invertColor ? 1.0f : 0.0f,
settings[2].invertColor ? 1.0f : 0.0f,
settings[3].invertColor ? 1.0f : 0.0f,
};
int[] channelSource =
{
settings[0].sourceChannel,
settings[1].sourceChannel,
settings[2].sourceChannel,
settings[3].sourceChannel
};
packChannelMaterial.SetTexture("_RedChannel", textures[0] != null ? textures[0] : Texture2D.blackTexture);
packChannelMaterial.SetTexture("_GreenChannel", textures[1] != null ? textures[1] : Texture2D.blackTexture);
packChannelMaterial.SetTexture("_BlueChannel", textures[2] != null ? textures[2] : Texture2D.blackTexture);
packChannelMaterial.SetTexture("_AlphaChannel", textures[3] != null ? textures[3] : Texture2D.blackTexture);
packChannelMaterial.SetVector("_InvertColor", new Vector4(invertColor[0], invertColor[1], invertColor[2], invertColor[3]));
packChannelMaterial.SetInt("_RedSource", channelSource[0]);
packChannelMaterial.SetInt("_GreenSource", channelSource[1]);
packChannelMaterial.SetInt("_BlueSource", channelSource[2]);
packChannelMaterial.SetInt("_AlphaSource", channelSource[3]);
var rt = RenderTexture.GetTemporary(width, height, 0, RenderTextureFormat.ARGB32,
RenderTextureReadWrite.Linear);
RenderTexture previous = RenderTexture.active;
RenderTexture.active = rt;
CommandBuffer cmd = new CommandBuffer();
cmd.Blit(null, rt, packChannelMaterial);
cmd.SetRenderTarget(BuiltinRenderTextureType.CameraTarget);
Graphics.ExecuteCommandBuffer(cmd);
mask.ReadPixels(new Rect(0, 0, width, height), 0, 0);
mask.Apply();
RenderTexture.active = previous;
RenderTexture.ReleaseTemporary(rt);
}
else
{
Color[][] pixels =
{
textures[0] != null ? textures[0].GetPixels(0) : null,
textures[1] != null ? textures[1].GetPixels(0) : null,
textures[2] != null ? textures[2].GetPixels(0) : null,
textures[3] != null ? textures[3].GetPixels(0) : null,
};
Color[] maskPixels = new Color[pixelCount];
for (int i = 0; i < pixelCount; ++i)
{
float r = (textures[0] != null) ? pixels[0][i].r : 0.0f;
float g = (textures[1] != null) ? pixels[1][i].r : 0.0f;
float b = (textures[2] != null) ? pixels[2][i].r : 0.0f;
float a = (textures[3] != null) ? pixels[3][i].r : 0.0f;
if (settings[0].invertColor)
{
r = 1.0f - r;
}
if (settings[1].invertColor)
{
g = 1.0f - g;
}
if (settings[2].invertColor)
{
b = 1.0f - b;
}
if (settings[3].invertColor)
{
a = 1.0f - a;
}
maskPixels[i] = new Color(r, g, b, a);
}
mask.SetPixels(maskPixels, 0);
mask.Apply();
}
}
