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(ShaderIDs.HistogramBuffer, context.logHistogram.data);
sheet.properties.SetVector(ShaderIDs.Params, new Vector4(lowPercent * 0.01f, highPercent * 0.01f, RuntimeUtilities.Exp2(settings.minLuminance.value), RuntimeUtilities.Exp2(settings.maxLuminance.value)));
sheet.properties.SetVector(ShaderIDs.Speed, new Vector2(settings.speedDown.value, settings.speedUp.value));
sheet.properties.SetVector(ShaderIDs.ScaleOffsetRes, context.logHistogram.GetHistogramScaleOffsetRes(context));
sheet.properties.SetFloat(ShaderIDs.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)
{
var cmd = context.command;
cmd.BeginSample("AutoExposureLookup");
// Prepare autoExpo texture pool
CheckTexture(context.xrActiveEye, 0);
CheckTexture(context.xrActiveEye, 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);
// Clamp min/max adaptation values as well
float minLum = settings.minLuminance.value;
float maxLum = settings.maxLuminance.value;
settings.minLuminance.value = Mathf.Min(minLum, maxLum);
settings.maxLuminance.value = Mathf.Max(minLum, maxLum);
// Compute average luminance & auto exposure
bool firstFrame = m_ResetHistory || !Application.isPlaying;
string adaptation = null;
if (firstFrame || settings.eyeAdaptation.value == EyeAdaptation.Fixed)
{
adaptation = "KAutoExposureAvgLuminance_fixed";
}
else
{
adaptation = "KAutoExposureAvgLuminance_progressive";
}
var compute = context.resources.computeShaders.autoExposure;
int kernel = compute.FindKernel(adaptation);
cmd.SetComputeBufferParam(compute, kernel, "_HistogramBuffer", context.logHistogram.data);
cmd.SetComputeVectorParam(compute, "_Params1", new Vector4(lowPercent * 0.01f, highPercent * 0.01f, RuntimeUtilities.Exp2(settings.minLuminance.value), RuntimeUtilities.Exp2(settings.maxLuminance.value)));
cmd.SetComputeVectorParam(compute, "_Params2", new Vector4(settings.speedDown.value, settings.speedUp.value, settings.keyValue.value, Time.deltaTime));
cmd.SetComputeVectorParam(compute, "_ScaleOffsetRes", context.logHistogram.GetHistogramScaleOffsetRes(context));
if (firstFrame)
{
// 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[context.xrActiveEye][0];
cmd.SetComputeTextureParam(compute, kernel, "_Destination", m_CurrentAutoExposure);
cmd.DispatchCompute(compute, kernel, 1, 1, 1);
// Copy current exposure to the other pingpong target to avoid adapting from black
RuntimeUtilities.CopyTexture(cmd, m_AutoExposurePool[context.xrActiveEye][0], m_AutoExposurePool[context.xrActiveEye][1]);
m_ResetHistory = false;
}
else
{
int pp = m_AutoExposurePingPong[context.xrActiveEye];
var src = m_AutoExposurePool[context.xrActiveEye][++pp % 2];
var dst = m_AutoExposurePool[context.xrActiveEye][++pp % 2];
cmd.SetComputeTextureParam(compute, kernel, "_Source", src);
cmd.SetComputeTextureParam(compute, kernel, "_Destination", dst);
cmd.DispatchCompute(compute, kernel, 1, 1, 1);
m_AutoExposurePingPong[context.xrActiveEye] = ++pp % 2;
m_CurrentAutoExposure = dst;
}
cmd.EndSample("AutoExposureLookup");
context.autoExposureTexture = m_CurrentAutoExposure;
context.autoExposure = settings;
}
