void CheckInternalLogLut()
{
// Check internal lut state, (re)create it if needed
if (m_InternalLogLut == null || !m_InternalLogLut.IsCreated())
{
RuntimeUtilities.Destroy(m_InternalLogLut);
var format = GetLutFormat();
m_InternalLogLut = new RenderTexture(k_Lut3DSize, k_Lut3DSize, 0, format, RenderTextureReadWrite.Linear)
{
name = "Color Grading Log Lut",
hideFlags = HideFlags.DontSave,
filterMode = FilterMode.Bilinear,
wrapMode = TextureWrapMode.Clamp,
anisoLevel = 0,
enableRandomWrite = true,
volumeDepth = k_Lut3DSize,
dimension = TextureDimension.Tex3D,
autoGenerateMips = false,
useMipMap = false
};
m_InternalLogLut.Create();
}
}
public override void Render(PostProcessRenderContext context)
{
var cmd = context.command;
cmd.BeginSample("AutoExposureLookup");
var sheet = context.propertySheets.Get(context.resources.shaders.autoExposure);
sheet.ClearKeywords();
// Prepare autoExpo texture pool
CheckTexture(0);
CheckTexture(1);
// Make sure filtering values are correct to avoid apocalyptic consequences
float lowPercent = settings.filtering.value.x;
float highPercent = settings.filtering.value.y;
const float kMinDelta = 1e-2f;
highPercent = Mathf.Clamp(highPercent, 1f + kMinDelta, 99f);
lowPercent = Mathf.Clamp(lowPercent, 1f, highPercent - kMinDelta);
// Compute auto exposure
sheet.properties.SetBuffer(Uniforms._HistogramBuffer, context.logHistogram.data);
sheet.properties.SetVector(Uniforms._Params, new Vector4(lowPercent * 0.01f, highPercent * 0.01f, RuntimeUtilities.Exp2(settings.minLuminance.value), RuntimeUtilities.Exp2(settings.maxLuminance.value)));
sheet.properties.SetVector(Uniforms._Speed, new Vector2(settings.speedDown.value, settings.speedUp.value));
sheet.properties.SetVector(Uniforms._ScaleOffsetRes, context.logHistogram.GetHistogramScaleOffsetRes(context));
sheet.properties.SetFloat(Uniforms._ExposureCompensation, settings.keyValue.value);
if (m_FirstFrame || !Application.isPlaying)
{
// We don't want eye adaptation when not in play mode because the GameView isn't
// animated, thus making it harder to tweak. Just use the final audo exposure value.
m_CurrentAutoExposure = m_AutoExposurePool[0];
cmd.BlitFullscreenTriangle(BuiltinRenderTextureType.None, m_CurrentAutoExposure, sheet, (int)EyeAdaptation.Fixed);
// Copy current exposure to the other pingpong target to avoid adapting from black
RuntimeUtilities.CopyTexture(cmd, m_AutoExposurePool[0], m_AutoExposurePool[1]);
}
else
{
int pp = m_AutoExposurePingPong;
var src = m_AutoExposurePool[++pp % 2];
var dst = m_AutoExposurePool[++pp % 2];
cmd.BlitFullscreenTriangle(src, dst, sheet, (int)settings.eyeAdaptation.value);
m_AutoExposurePingPong = ++pp % 2;
m_CurrentAutoExposure = dst;
}
cmd.EndSample("AutoExposureLookup");
context.autoExposureTexture = m_CurrentAutoExposure;
context.autoExposure = settings;
m_FirstFrame = false;
}
public override void Render(PostProcessRenderContext context)
{
// Setup compute
if (m_EyeCompute == null)
{
m_EyeCompute = Resources.Load <ComputeShader>("Shaders/Builtins/ExposureHistogram");
}
var cmd = context.command;
cmd.BeginSample("AutoExposureLookup");
var sheet = context.propertySheets.Get("Hidden/PostProcessing/AutoExposure");
sheet.ClearKeywords();
if (m_HistogramBuffer == null)
{
m_HistogramBuffer = new ComputeBuffer(k_HistogramBins, sizeof(uint));
}
// Downscale the framebuffer, we don't need an absolute precision for auto exposure and it
// helps making it more stable
var scaleOffsetRes = GetHistogramScaleOffsetRes(context);
cmd.GetTemporaryRT(Uniforms._AutoExposureCopyTex,
(int)scaleOffsetRes.z,
(int)scaleOffsetRes.w,
0,
FilterMode.Bilinear,
context.sourceFormat);
cmd.BlitFullscreenTriangle(context.source, Uniforms._AutoExposureCopyTex);
// Prepare autoExpo texture pool
CheckTexture(0);
CheckTexture(1);
// Clear the buffer on every frame as we use it to accumulate luminance values on each frame
m_HistogramBuffer.SetData(s_EmptyHistogramBuffer);
// Get a log histogram
int kernel = m_EyeCompute.FindKernel("KEyeHistogram");
cmd.SetComputeBufferParam(m_EyeCompute, kernel, "_HistogramBuffer", m_HistogramBuffer);
cmd.SetComputeTextureParam(m_EyeCompute, kernel, "_Source", Uniforms._AutoExposureCopyTex);
cmd.SetComputeVectorParam(m_EyeCompute, "_ScaleOffsetRes", scaleOffsetRes);
cmd.DispatchCompute(m_EyeCompute, kernel,
Mathf.CeilToInt(scaleOffsetRes.z / (float)k_HistogramThreadX),
Mathf.CeilToInt(scaleOffsetRes.w / (float)k_HistogramThreadY),
1);
// Cleanup
cmd.ReleaseTemporaryRT(Uniforms._AutoExposureCopyTex);
// Make sure filtering values are correct to avoid apocalyptic consequences
float lowPercent = settings.filtering.value.x;
float highPercent = settings.filtering.value.y;
const float kMinDelta = 1e-2f;
highPercent = Mathf.Clamp(highPercent, 1f + kMinDelta, 99f);
lowPercent = Mathf.Clamp(lowPercent, 1f, highPercent - kMinDelta);
// Compute auto exposure
sheet.properties.SetBuffer(Uniforms._HistogramBuffer, m_HistogramBuffer);
sheet.properties.SetVector(Uniforms._Params, new Vector4(lowPercent * 0.01f, highPercent * 0.01f, RuntimeUtilities.Exp2(settings.minLuminance.value), RuntimeUtilities.Exp2(settings.maxLuminance.value)));
sheet.properties.SetVector(Uniforms._Speed, new Vector2(settings.speedDown.value, settings.speedUp.value));
sheet.properties.SetVector(Uniforms._ScaleOffsetRes, scaleOffsetRes);
sheet.properties.SetFloat(Uniforms._ExposureCompensation, settings.keyValue.value);
if (settings.dynamicKeyValue)
{
sheet.EnableKeyword("AUTO_KEY_VALUE");
}
if (m_FirstFrame || !Application.isPlaying)
{
// We don't want eye adaptation when not in play mode because the GameView isn't
// animated, thus making it harder to tweak. Just use the final audo exposure value.
m_CurrentAutoExposure = m_AutoExposurePool[0];
cmd.BlitFullscreenTriangle((Texture)null, m_CurrentAutoExposure, sheet, (int)EyeAdaptation.Fixed);
// Copy current exposure to the other pingpong target to avoid adapting from black
RuntimeUtilities.CopyTexture(cmd, m_AutoExposurePool[0], m_AutoExposurePool[1]);
}
else
{
int pp = m_AutoExposurePingPong;
var src = m_AutoExposurePool[++pp % 2];
var dst = m_AutoExposurePool[++pp % 2];
cmd.BlitFullscreenTriangle(src, dst, sheet, (int)settings.eyeAdaptation.value);
m_AutoExposurePingPong = ++pp % 2;
m_CurrentAutoExposure = dst;
}
cmd.EndSample("AutoExposureLookup");
context.autoExposureTexture = m_CurrentAutoExposure;
m_FirstFrame = false;
}
public override void Release()
{
RuntimeUtilities.Destroy(m_GrainLookupRT);
m_GrainLookupRT = null;
m_SampleIndex = 0;
}
public override void Release()
{
RuntimeUtilities.Destroy(m_InternalSpectralLut);
m_InternalSpectralLut = null;
}
// HDR color pipeline is rendered to a 3D lut; it requires Texture3D & compute shaders
// support - Desktop / Consoles / Some high-end mobiles
void RenderHDRPipeline(PostProcessRenderContext context)
{
// Unfortunately because AnimationCurve doesn't implement GetHashCode and we don't have
// any reliable way to figure out if a curve data is different from another one we can't
// skip regenerating the Lut if nothing has changed. So it has to be done on every
// frame...
// It's not a very expensive operation anyway (we're talking about filling a 33x33x33
// Lut on the GPU) but every little thing helps, especially on mobile.
{
CheckInternalLogLut();
// Lut setup
var compute = context.resources.computeShaders.lut3DBaker;
int kernel = 0;
switch (settings.tonemapper.value)
{
case Tonemapper.None: kernel = compute.FindKernel("KGenLut3D_NoTonemap");
break;
case Tonemapper.Neutral: kernel = compute.FindKernel("KGenLut3D_NeutralTonemap");
break;
case Tonemapper.ACES: kernel = compute.FindKernel("KGenLut3D_AcesTonemap");
break;
case Tonemapper.Custom: kernel = compute.FindKernel("KGenLut3D_CustomTonemap");
break;
}
int groupSize = Mathf.CeilToInt(k_Lut3DSize / 8f);
var cmd = context.command;
cmd.SetComputeTextureParam(compute, kernel, "_Output", m_InternalLogLut);
cmd.SetComputeVectorParam(compute, "_Size", new Vector4(k_Lut3DSize, 1f / (k_Lut3DSize - 1f), 0f, 0f));
var colorBalance = ColorUtilities.ComputeColorBalance(settings.temperature.value, settings.tint.value);
cmd.SetComputeVectorParam(compute, "_ColorBalance", colorBalance);
cmd.SetComputeVectorParam(compute, "_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]
cmd.SetComputeVectorParam(compute, "_HueSatCon", new Vector4(hue, sat, con, 0f));
var channelMixerR = new Vector4(settings.mixerRedOutRedIn, settings.mixerRedOutGreenIn, settings.mixerRedOutBlueIn, 0f);
var channelMixerG = new Vector4(settings.mixerGreenOutRedIn, settings.mixerGreenOutGreenIn, settings.mixerGreenOutBlueIn, 0f);
var channelMixerB = new Vector4(settings.mixerBlueOutRedIn, settings.mixerBlueOutGreenIn, settings.mixerBlueOutBlueIn, 0f);
cmd.SetComputeVectorParam(compute, "_ChannelMixerRed", channelMixerR / 100f); // Remap to [-2;2]
cmd.SetComputeVectorParam(compute, "_ChannelMixerGreen", channelMixerG / 100f);
cmd.SetComputeVectorParam(compute, "_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);
cmd.SetComputeVectorParam(compute, "_Lift", new Vector4(lift.x, lift.y, lift.z, 0f));
cmd.SetComputeVectorParam(compute, "_InvGamma", new Vector4(invgamma.x, invgamma.y, invgamma.z, 0f));
cmd.SetComputeVectorParam(compute, "_Gain", new Vector4(gain.x, gain.y, gain.z, 0f));
cmd.SetComputeTextureParam(compute, kernel, "_Curves", GetCurveTexture(true));
if (settings.tonemapper.value == Tonemapper.Custom)
{
m_HableCurve.Init(
settings.toneCurveToeStrength.value,
settings.toneCurveToeLength.value,
settings.toneCurveShoulderStrength.value,
settings.toneCurveShoulderLength.value,
settings.toneCurveShoulderAngle.value,
settings.toneCurveGamma.value
);
var curve = new Vector4(m_HableCurve.inverseWhitePoint, m_HableCurve.x0, m_HableCurve.x1, 0f);
cmd.SetComputeVectorParam(compute, "_CustomToneCurve", curve);
var toe = m_HableCurve.segments[0];
var mid = m_HableCurve.segments[1];
var sho = m_HableCurve.segments[2];
var toeSegmentA = new Vector4(toe.offsetX, toe.offsetY, toe.scaleX, toe.scaleY);
var toeSegmentB = new Vector4(toe.lnA, toe.B, 0f, 0f);
var midSegmentA = new Vector4(mid.offsetX, mid.offsetY, mid.scaleX, mid.scaleY);
var midSegmentB = new Vector4(mid.lnA, mid.B, 0f, 0f);
var shoSegmentA = new Vector4(sho.offsetX, sho.offsetY, sho.scaleX, sho.scaleY);
var shoSegmentB = new Vector4(sho.lnA, sho.B, 0f, 0f);
cmd.SetComputeVectorParam(compute, "_ToeSegmentA", toeSegmentA);
cmd.SetComputeVectorParam(compute, "_ToeSegmentB", toeSegmentB);
cmd.SetComputeVectorParam(compute, "_MidSegmentA", midSegmentA);
cmd.SetComputeVectorParam(compute, "_MidSegmentB", midSegmentB);
cmd.SetComputeVectorParam(compute, "_ShoSegmentA", shoSegmentA);
cmd.SetComputeVectorParam(compute, "_ShoSegmentB", shoSegmentB);
}
// Generate the lut
context.command.BeginSample("HdrColorGradingLut");
cmd.DispatchCompute(compute, kernel, groupSize, groupSize, groupSize);
context.command.EndSample("HdrColorGradingLut");
}
var lut = m_InternalLogLut;
var uberSheet = context.uberSheet;
uberSheet.EnableKeyword("COLOR_GRADING_HDR");
uberSheet.properties.SetTexture(Uniforms._Lut3D, lut);
uberSheet.properties.SetVector(Uniforms._Lut3D_Params, new Vector2(1f / lut.width, lut.width - 1f));
uberSheet.properties.SetFloat(Uniforms._PostExposure, RuntimeUtilities.Exp2(settings.postExposure.value));
context.logLut = lut;
}
public override void Render(PostProcessRenderContext context)
{
var cmd = context.command;
cmd.BeginSample("BloomPyramid");
var sheet = context.propertySheets.Get(context.resources.shaders.bloom);
// Apply auto exposure adjustment in the prefiltering pass
sheet.properties.SetTexture(Uniforms._AutoExposureTex, context.autoExposureTexture);
// Determine the iteration count
float logh = Mathf.Log(context.height, 2f) + settings.diffusion.value - 10f;
int logh_i = Mathf.FloorToInt(logh);
int iterations = Mathf.Clamp(logh_i, 1, k_MaxPyramidSize);
float sampleScale = 0.5f + logh - logh_i;
sheet.properties.SetFloat(Uniforms._SampleScale, sampleScale);
// Do bloom on a half-res buffer, full-res doesn't bring much and kills performances on
// fillrate limited platforms
int tw = context.width / 2;
int th = context.height / 2;
// Prefiltering parameters
float lthresh = Mathf.GammaToLinearSpace(settings.threshold.value);
float knee = lthresh * settings.softKnee.value + 1e-5f;
var threshold = new Vector4(lthresh, lthresh - knee, knee * 2f, 0.25f / knee);
sheet.properties.SetVector(Uniforms._Threshold, threshold);
int qualityOffset = settings.mobileOptimized ? 1 : 0;
// Downsample
var last = context.source;
for (int i = 0; i < iterations; i++)
{
int mipDown = m_Pyramid[i].down;
int mipUp = m_Pyramid[i].up;
int pass = i == 0
? (int)Pass.Prefilter13 + qualityOffset
: (int)Pass.Downsample13 + qualityOffset;
cmd.GetTemporaryRT(mipDown, tw, th, 0, FilterMode.Bilinear, context.sourceFormat);
cmd.GetTemporaryRT(mipUp, tw, th, 0, FilterMode.Bilinear, context.sourceFormat);
cmd.BlitFullscreenTriangle(last, mipDown, sheet, pass);
last = mipDown;
tw /= 2; th /= 2;
}
// Upsample
last = m_Pyramid[iterations - 1].down;
for (int i = iterations - 2; i >= 0; i--)
{
int mipDown = m_Pyramid[i].down;
int mipUp = m_Pyramid[i].up;
cmd.SetGlobalTexture(Uniforms._BloomTex, mipDown);
cmd.BlitFullscreenTriangle(last, mipUp, sheet, (int)Pass.UpsampleTent + qualityOffset);
last = mipUp;
}
var shaderSettings = new Vector4(
sampleScale,
RuntimeUtilities.Exp2(settings.intensity.value / 10f) - 1f,
settings.lensIntensity.value,
iterations
);
var dirtTexture = settings.lensTexture.value == null
? RuntimeUtilities.blackTexture
: settings.lensTexture.value;
var uberSheet = context.uberSheet;
uberSheet.EnableKeyword("BLOOM");
uberSheet.properties.SetVector(Uniforms._Bloom_Settings, shaderSettings);
uberSheet.properties.SetColor(Uniforms._Bloom_Color, settings.color.value.linear);
uberSheet.properties.SetTexture(Uniforms._Bloom_DirtTex, dirtTexture);
cmd.SetGlobalTexture(Uniforms._BloomTex, m_Pyramid[0].up);
// Cleanup
for (int i = 0; i < iterations; i++)
{
cmd.ReleaseTemporaryRT(m_Pyramid[i].down);
cmd.ReleaseTemporaryRT(m_Pyramid[i].up);
}
cmd.EndSample("BloomPyramid");
}
void OnLightMeterGUI(PostProcessRenderContext context)
{
if (m_TickLabelStyle == null)
{
m_TickLabelStyle = new GUIStyle("Label")
{
fontStyle = FontStyle.Bold,
fontSize = 10,
alignment = TextAnchor.MiddleCenter
};
}
var histogram = context.logHistogram;
int kMargin = 8;
int x = kMargin;
int w = (int)(context.width * (3 / 5f) - kMargin * 2);
int h = context.height / 4;
int y = context.height - h - kMargin - 30;
var rect = new Rect(x, y, w, h);
if (Event.current.type == EventType.Repaint)
{
CheckTexture(ref m_LightMeterRT, (int)rect.width, (int)rect.height);
var material = context.propertySheets.Get(context.resources.shaders.lightMeter).material;
material.shaderKeywords = null;
material.SetBuffer(Uniforms._HistogramBuffer, histogram.data);
var scaleOffsetRes = histogram.GetHistogramScaleOffsetRes(context);
scaleOffsetRes.z = 1f / rect.width;
scaleOffsetRes.w = 1f / rect.height;
material.SetVector(Uniforms._ScaleOffsetRes, scaleOffsetRes);
if (context.logLut != null)
{
material.EnableKeyword("COLOR_GRADING_HDR");
material.SetTexture(Uniforms._Lut3D, context.logLut);
}
if (context.autoExposure != null)
{
var settings = context.autoExposure;
// Make sure filtering values are correct to avoid apocalyptic consequences
float lowPercent = settings.filtering.value.x;
float highPercent = settings.filtering.value.y;
const float kMinDelta = 1e-2f;
highPercent = Mathf.Clamp(highPercent, 1f + kMinDelta, 99f);
lowPercent = Mathf.Clamp(lowPercent, 1f, highPercent - kMinDelta);
material.EnableKeyword("AUTO_EXPOSURE");
material.SetVector(Uniforms._Params, new Vector4(lowPercent * 0.01f, highPercent * 0.01f, RuntimeUtilities.Exp2(settings.minLuminance.value), RuntimeUtilities.Exp2(settings.maxLuminance.value)));
}
RuntimeUtilities.BlitFullscreenTriangle(null, m_LightMeterRT, material, 0);
GUI.DrawTexture(rect, m_LightMeterRT);
}
// Labels
rect.y += rect.height;
rect.height = 30;
int maxSize = Mathf.FloorToInt(rect.width / (LogHistogram.rangeMax - LogHistogram.rangeMin + 2));
GUI.DrawTexture(rect, RuntimeUtilities.blackTexture);
GUILayout.BeginArea(rect);
{
GUILayout.BeginHorizontal();
{
GUILayout.Space(4);
for (int i = LogHistogram.rangeMin; i < LogHistogram.rangeMax; i++)
{
GUILayout.Label(i + "\n" + RuntimeUtilities.Exp2(i).ToString("0.###"), m_TickLabelStyle, GUILayout.Width(maxSize));
GUILayout.FlexibleSpace();
}
GUILayout.Label(LogHistogram.rangeMax + "\n" + RuntimeUtilities.Exp2(LogHistogram.rangeMax).ToString("0.###"), m_TickLabelStyle, GUILayout.Width(maxSize));
GUILayout.Space(4);
}
GUILayout.EndHorizontal();
}
GUILayout.EndArea();
}
internal void Release()
{
RuntimeUtilities.Destroy(m_LightMeterRT);
m_LightMeterRT = null;
}