void RenderHDRPipeline2D()

in unity/Assets/PostProcessingV2/Runtime/Effects/ColorGrading.cs [308:384]
62 lines of code
4 McCabe index (conditional complexity)

        void RenderHDRPipeline2D(PostProcessRenderContext context)
        {
            // For the same reasons as in RenderHDRPipeline3D, regen LUT on evey frame
            {
                CheckInternalStripLut();

                // Lut setup
                var lutSheet = context.propertySheets.Get(context.resources.shaders.lut2DBaker);
                lutSheet.ClearKeywords();

                lutSheet.properties.SetVector(ShaderIDs.Lut2D_Params, new Vector4(k_Lut2DSize, 0.5f / (k_Lut2DSize * k_Lut2DSize), 0.5f / k_Lut2DSize, k_Lut2DSize / (k_Lut2DSize - 1f)));

                var colorBalance = ColorUtilities.ComputeColorBalance(settings.temperature.value, settings.tint.value);
                lutSheet.properties.SetVector(ShaderIDs.ColorBalance, colorBalance);
                lutSheet.properties.SetVector(ShaderIDs.ColorFilter, settings.colorFilter.value);

                float hue = settings.hueShift.value / 360f;         // Remap to [-0.5;0.5]
                float sat = settings.saturation.value / 100f + 1f;  // Remap to [0;2]
                float con = settings.contrast.value / 100f + 1f;    // Remap to [0;2]
                lutSheet.properties.SetVector(ShaderIDs.HueSatCon, new Vector3(hue, sat, con));

                var channelMixerR = new Vector3(settings.mixerRedOutRedIn, settings.mixerRedOutGreenIn, settings.mixerRedOutBlueIn);
                var channelMixerG = new Vector3(settings.mixerGreenOutRedIn, settings.mixerGreenOutGreenIn, settings.mixerGreenOutBlueIn);
                var channelMixerB = new Vector3(settings.mixerBlueOutRedIn, settings.mixerBlueOutGreenIn, settings.mixerBlueOutBlueIn);
                lutSheet.properties.SetVector(ShaderIDs.ChannelMixerRed, channelMixerR / 100f);            // Remap to [-2;2]
                lutSheet.properties.SetVector(ShaderIDs.ChannelMixerGreen, channelMixerG / 100f);
                lutSheet.properties.SetVector(ShaderIDs.ChannelMixerBlue, channelMixerB / 100f);

                var lift = ColorUtilities.ColorToLift(settings.lift.value * 0.2f);
                var gain = ColorUtilities.ColorToGain(settings.gain.value * 0.8f);
                var invgamma = ColorUtilities.ColorToInverseGamma(settings.gamma.value * 0.8f);
                lutSheet.properties.SetVector(ShaderIDs.Lift, lift);
                lutSheet.properties.SetVector(ShaderIDs.InvGamma, invgamma);
                lutSheet.properties.SetVector(ShaderIDs.Gain, gain);

                lutSheet.properties.SetTexture(ShaderIDs.Curves, GetCurveTexture(false));

                var tonemapper = settings.tonemapper.value;
                if (tonemapper == Tonemapper.Custom)
                {
                    lutSheet.EnableKeyword("TONEMAPPING_CUSTOM");

                    m_HableCurve.Init(
                        settings.toneCurveToeStrength.value,
                        settings.toneCurveToeLength.value,
                        settings.toneCurveShoulderStrength.value,
                        settings.toneCurveShoulderLength.value,
                        settings.toneCurveShoulderAngle.value,
                        settings.toneCurveGamma.value
                    );

                    lutSheet.properties.SetVector(ShaderIDs.CustomToneCurve, m_HableCurve.uniforms.curve);
                    lutSheet.properties.SetVector(ShaderIDs.ToeSegmentA, m_HableCurve.uniforms.toeSegmentA);
                    lutSheet.properties.SetVector(ShaderIDs.ToeSegmentB, m_HableCurve.uniforms.toeSegmentB);
                    lutSheet.properties.SetVector(ShaderIDs.MidSegmentA, m_HableCurve.uniforms.midSegmentA);
                    lutSheet.properties.SetVector(ShaderIDs.MidSegmentB, m_HableCurve.uniforms.midSegmentB);
                    lutSheet.properties.SetVector(ShaderIDs.ShoSegmentA, m_HableCurve.uniforms.shoSegmentA);
                    lutSheet.properties.SetVector(ShaderIDs.ShoSegmentB, m_HableCurve.uniforms.shoSegmentB);
                }
                else if (tonemapper == Tonemapper.ACES)
                    lutSheet.EnableKeyword("TONEMAPPING_ACES");
                else if (tonemapper == Tonemapper.Neutral)
                    lutSheet.EnableKeyword("TONEMAPPING_NEUTRAL");

                // Generate the lut
                context.command.BeginSample("HdrColorGradingLut2D");
                context.command.BlitFullscreenTriangle(BuiltinRenderTextureType.None, m_InternalLdrLut, lutSheet, (int)Pass.LutGenHDR2D);
                context.command.EndSample("HdrColorGradingLut2D");
            }

            var lut = m_InternalLdrLut;
            var uberSheet = context.uberSheet;
            uberSheet.EnableKeyword("COLOR_GRADING_HDR_2D");
            uberSheet.properties.SetVector(ShaderIDs.Lut2D_Params, new Vector3(1f / lut.width, 1f / lut.height, lut.height - 1f));
            uberSheet.properties.SetTexture(ShaderIDs.Lut2D, lut);
            uberSheet.properties.SetFloat(ShaderIDs.PostExposure, RuntimeUtilities.Exp2(settings.postExposure.value));
        }