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// Copyright 2009 Intel Corporation
// SPDX-License-Identifier: Apache-2.0
#include "ToneMapper.h"
#include "fb/FrameBufferView.h"
DECLARE_FRAMEOP_KERNEL_LAUNCHER(ToneMapper_kernelLauncher);
namespace ospray {
ToneMapperFrameOp::ToneMapperFrameOp(devicert::Device &device) : FrameOp(device)
{}
void ToneMapperFrameOp::commit()
{
FrameOp::commit();
exposure = getParam<float>("exposure", 1.f);
// Default parameters fitted to the ACES 1.0 grayscale curve
// (RRT.a1.0.3 + ODT.Academy.Rec709_100nits_dim.a1.0.3)
// We included exposure adjustment to match 18% middle gray
// (ODT(RRT(0.18)) = 0.18)
const float aces_contrast = 1.6773f;
const float aces_shoulder = 0.9714f;
const float aces_midIn = 0.18f;
const float aces_midOut = 0.18f;
const float aces_hdrMax = 11.0785f;
a = max(getParam<float>("contrast", aces_contrast), 0.0001f);
d = clamp(getParam<float>("shoulder", aces_shoulder), 0.0001f, 1.f);
float m = clamp(getParam<float>("midIn", aces_midIn), 0.0001f, 1.f);
float n = clamp(getParam<float>("midOut", aces_midOut), 0.0001f, 1.f);
float w = max(getParam<float>("hdrMax", aces_hdrMax), 1.f);
acesColor = getParam<bool>("acesColor", true);
// Solve b and c
b = -((powf(m, -a * d)
* (-powf(m, a)
+ (n
* (powf(m, a * d) * n * powf(w, a)
- powf(m, a) * powf(w, a * d)))
/ (powf(m, a * d) * n - n * powf(w, a * d))))
/ n);
// avoid discontinuous curve by clamping to 0
c = max((powf(m, a * d) * n * powf(w, a) - powf(m, a) * powf(w, a * d))
/ (powf(m, a * d) * n - n * powf(w, a * d)),
0.f);
}
std::unique_ptr<LiveFrameOpInterface> ToneMapperFrameOp::attach(
FrameBufferView &fbView)
{
return rkcommon::make_unique<LiveToneMapperFrameOp>(
device, fbView, exposure, a, b, c, d, acesColor);
}
std::string ToneMapperFrameOp::toString() const
{
return "ospray::ToneMapperFrameOp";
}
LiveToneMapperFrameOp::LiveToneMapperFrameOp(devicert::Device &device,
FrameBufferView &fbView,
float exposure,
float a,
float b,
float c,
float d,
bool acesColor)
: AddStructShared(device, device, fbView)
{
// Pass tone mapping parameters
getSh()->exposure = exposure;
getSh()->a = a;
getSh()->b = b;
getSh()->c = c;
getSh()->d = d;
getSh()->acesColor = acesColor;
}
devicert::AsyncEvent LiveToneMapperFrameOp::process()
{
const vec2ui &itemDims = getSh()->super.viewDims;
return device.launchFrameOpKernel(
itemDims, ispc::ToneMapper_kernelLauncher, &getSh()->super);
}
} // namespace ospray
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