void GenerateLut()
{
var settings = model.settings;
if (!IsLogLutValid(model.bakedLut))
{
GraphicsUtils.Destroy(model.bakedLut);
model.bakedLut = new RenderTexture(k_InternalLogLutSize * k_InternalLogLutSize, k_InternalLogLutSize, 0, GetLutFormat())
{
name = "Color Grading Log LUT",
hideFlags = HideFlags.DontSave,
filterMode = FilterMode.Bilinear,
wrapMode = TextureWrapMode.Clamp,
anisoLevel = 0
};
}
var lutMaterial = context.materialFactory.Get("Hidden/Post FX/Lut Generator");
lutMaterial.SetVector(Uniforms._LutParams, new Vector4(
k_InternalLogLutSize,
0.5f / (k_InternalLogLutSize * k_InternalLogLutSize),
0.5f / k_InternalLogLutSize,
k_InternalLogLutSize / (k_InternalLogLutSize - 1f))
);
// Tonemapping
lutMaterial.shaderKeywords = null;
var tonemapping = settings.tonemapping;
switch (tonemapping.tonemapper)
{
case ColorGradingModel.Tonemapper.Neutral:
{
lutMaterial.EnableKeyword("TONEMAPPING_NEUTRAL");
const float scaleFactor = 20f;
const float scaleFactorHalf = scaleFactor * 0.5f;
float inBlack = tonemapping.neutralBlackIn * scaleFactor + 1f;
float outBlack = tonemapping.neutralBlackOut * scaleFactorHalf + 1f;
float inWhite = tonemapping.neutralWhiteIn / scaleFactor;
float outWhite = 1f - tonemapping.neutralWhiteOut / scaleFactor;
float blackRatio = inBlack / outBlack;
float whiteRatio = inWhite / outWhite;
const float a = 0.2f;
float b = Mathf.Max(0f, Mathf.LerpUnclamped(0.57f, 0.37f, blackRatio));
float c = Mathf.LerpUnclamped(0.01f, 0.24f, whiteRatio);
float d = Mathf.Max(0f, Mathf.LerpUnclamped(0.02f, 0.20f, blackRatio));
const float e = 0.02f;
const float f = 0.30f;
lutMaterial.SetVector(Uniforms._NeutralTonemapperParams1, new Vector4(a, b, c, d));
lutMaterial.SetVector(Uniforms._NeutralTonemapperParams2, new Vector4(e, f, tonemapping.neutralWhiteLevel, tonemapping.neutralWhiteClip / scaleFactorHalf));
break;
}
case ColorGradingModel.Tonemapper.ACES:
{
lutMaterial.EnableKeyword("TONEMAPPING_FILMIC");
break;
}
}
// Color balance & basic grading settings
lutMaterial.SetFloat(Uniforms._HueShift, settings.basic.hueShift / 360f);
lutMaterial.SetFloat(Uniforms._Saturation, settings.basic.saturation);
lutMaterial.SetFloat(Uniforms._Contrast, settings.basic.contrast);
lutMaterial.SetVector(Uniforms._Balance, CalculateColorBalance(settings.basic.temperature, settings.basic.tint));
// Lift / Gamma / Gain
Vector3 lift, gamma, gain;
CalculateLiftGammaGain(
settings.colorWheels.linear.lift,
settings.colorWheels.linear.gamma,
settings.colorWheels.linear.gain,
out lift, out gamma, out gain
);
lutMaterial.SetVector(Uniforms._Lift, lift);
lutMaterial.SetVector(Uniforms._InvGamma, gamma);
lutMaterial.SetVector(Uniforms._Gain, gain);
// Slope / Power / Offset
Vector3 slope, power, offset;
CalculateSlopePowerOffset(
settings.colorWheels.log.slope,
settings.colorWheels.log.power,
settings.colorWheels.log.offset,
out slope, out power, out offset
);
lutMaterial.SetVector(Uniforms._Slope, slope);
lutMaterial.SetVector(Uniforms._Power, power);
lutMaterial.SetVector(Uniforms._Offset, offset);
// Channel mixer
lutMaterial.SetVector(Uniforms._ChannelMixerRed, settings.channelMixer.red);
lutMaterial.SetVector(Uniforms._ChannelMixerGreen, settings.channelMixer.green);
lutMaterial.SetVector(Uniforms._ChannelMixerBlue, settings.channelMixer.blue);
// Selective grading & YRGB curves
lutMaterial.SetTexture(Uniforms._Curves, GetCurveTexture());
// Generate the lut
Graphics.Blit(null, model.bakedLut, lutMaterial, 0);
}
public override void OnDisable()
{
GraphicsUtils.Destroy(m_SpectrumLut);
m_SpectrumLut = null;
}
public void Release()
{
GraphicsUtils.Destroy(mesh);
mesh = null;
}
public override void OnDisable()
{
GraphicsUtils.Destroy(m_GrainLookupRT);
m_GrainLookupRT = null;
}
