441 lines
15 KiB
C++
441 lines
15 KiB
C++
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <cstdlib>
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#include <fstream>
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#include <iostream>
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#include <math/mat3.h>
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#include <math/scalar.h>
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#include <math/vec3.h>
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#include <image/ColorTransform.h>
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#include <image/LinearImage.h>
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#include <imageio/ImageEncoder.h>
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#include <utils/JobSystem.h>
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#include <utils/Path.h>
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#include <getopt/getopt.h>
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extern "C" {
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#include <ArHosekSkyModel.h>
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}
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using namespace filament::math;
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using namespace image;
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using namespace utils;
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static const uint32_t DEFAULT_ENV_MAP_WIDTH = 4096;
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static ImageEncoder::Format g_format = ImageEncoder::Format::PNG_LINEAR;
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static bool g_formatSpecified = false;
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static std::string g_compression;
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static uint32_t g_outputWidth = DEFAULT_ENV_MAP_WIDTH;
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static float g_turbidity = 4.0f; // between 1 and 32
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static float g_elevation = 0.785398f; // sun elevation in radians (45 degrees)
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static float g_azimuth = 0.0f; // sun azimuth in radians (0.0 degrees)
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static float3 g_groundAlbedo = float3{0.25f}; // ground albedo
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static bool g_normalize = false;
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static bool g_tonemap = false;
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static bool g_gammaCorrect = false;
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float luminance(const float3 linear) {
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// Luminance coefficients from Rec. 709
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return dot(linear, float3(0.2126, 0.7152, 0.0722));
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}
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static float3 tonemapACES(const float3& x) {
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const float a = 2.51;
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const float b = 0.03;
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const float c = 2.43;
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const float d = 0.59;
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const float e = 0.14;
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return (x * (a * x + b)) / (x * (c * x + d) + e);
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}
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static inline float3 XYZ_to_sRGB(float3 const& v) {
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// XYZ to linear sRGB
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const mat3f XYZ_sRGB{
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3.2404542f, -0.9692660f, 0.0556434f,
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-1.5371385f, 1.8760108f, -0.2040259f,
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-0.4985314f, 0.0415560f, 1.0572252f
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};
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return XYZ_sRGB * v;
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}
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static float angleBetween(float thetav, float phiv, float theta, float phi) {
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float cosGamma = sinf(thetav) * sinf(theta) * cosf(phi - phiv) + cosf(thetav) * cosf(theta);
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return acosf(cosGamma);
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}
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static void generateSky(LinearImage image) {
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printf("Sky parameters\n");
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printf(" Elevation: %.2f°\n", g_elevation * 180.0 * M_1_PI);
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printf(" Azimuth: %.2f°\n", g_azimuth * 180.0 * M_1_PI);
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printf(" Turbidity: %.2f\n", g_turbidity);
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printf("\n");
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struct {
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std::vector<float> maximas;
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std::mutex maximasMutex;
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float solarElevation = clamp(g_elevation, 0.0f, float(M_PI_2));
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float sunTheta = float(M_PI_2 - solarElevation);
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float sunPhi = 0.0f;
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float3 integral = 0.0f;
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ArHosekSkyModelState* skyState[9] = {
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arhosek_xyz_skymodelstate_alloc_init(g_turbidity, g_groundAlbedo.r, solarElevation),
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arhosek_xyz_skymodelstate_alloc_init(g_turbidity, g_groundAlbedo.g, solarElevation),
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arhosek_xyz_skymodelstate_alloc_init(g_turbidity, g_groundAlbedo.b, solarElevation)
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};
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} jobData{};
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jobData.maximas.reserve(256);
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// init the job system for parallel_for
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static JobSystem js;
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js.adopt();
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// generate the sky
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auto job = jobs::parallel_for<char>(js, nullptr, nullptr, uint32_t(image.getHeight()),
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[&image, &jobData](const char* d, size_t c) {
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const size_t w = image.getWidth();
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const size_t h = image.getHeight();
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float maxSample = 0.00001f;
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float3 integral{0.0f};
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size_t y0 = size_t(d);
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for (size_t y = y0; y < y0 + c; y++) {
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float3* UTILS_RESTRICT data = image.get<float3>(0, (uint32_t) y);
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float v = (y + 0.5f) / h;
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float theta = float(M_PI * v);
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if (theta > M_PI_2) return;
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float integralDelta = sin(theta) / (w * h / 2.0f);
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for (size_t x = 0; x < w; x++, data++) {
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float u = (x + 0.5f) / w;
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float phi = float(-2.0 * M_PI * u + M_PI + g_azimuth);
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float gamma = angleBetween(theta, phi, jobData.sunTheta, jobData.sunPhi);
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float3 sample{
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arhosek_tristim_skymodel_radiance(jobData.skyState[0], theta, gamma, 0),
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arhosek_tristim_skymodel_radiance(jobData.skyState[1], theta, gamma, 1),
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arhosek_tristim_skymodel_radiance(jobData.skyState[2], theta, gamma, 2)
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};
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if (g_normalize) {
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sample *= float(4.0 * M_PI / 683.0);
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}
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maxSample = std::max(maxSample, sample.y);
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*data = XYZ_to_sRGB(sample);
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integral += *data * integralDelta;
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}
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}
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std::lock_guard<std::mutex> guard(jobData.maximasMutex);
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jobData.maximas.push_back(maxSample);
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jobData.integral += integral;
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},
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jobs::CountSplitter<1, 8>()
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);
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js.runAndWait(job);
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// cleanup sky data
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arhosekskymodelstate_free(jobData.skyState[0]);
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arhosekskymodelstate_free(jobData.skyState[1]);
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arhosekskymodelstate_free(jobData.skyState[2]);
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float maxValue = *std::max_element(jobData.maximas.cbegin(), jobData.maximas.cend());
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// remap to the range 0..16 to fit in our RGBM format
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float hdrScale = 1.0f / (g_normalize ? maxValue : maxValue / 16.0f);
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switch (g_format) {
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case ImageEncoder::Format::PNG: break;
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case ImageEncoder::Format::PNG_LINEAR: break;
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case ImageEncoder::Format::HDR: break;
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case ImageEncoder::Format::RGBM: break;
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case ImageEncoder::Format::RGB_10_11_11_REV: break;
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case ImageEncoder::Format::PSD:
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if (g_compression != "32") {
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hdrScale = 1.0f / maxValue;
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} else {
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hdrScale = g_normalize ? 1.0f / maxValue : 1.0f;
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}
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break;
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case ImageEncoder::Format::EXR:
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hdrScale = g_normalize ? 1.0f / maxValue : 1.0f;
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break;
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case ImageEncoder::Format::DDS:
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case ImageEncoder::Format::DDS_LINEAR:
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if (g_compression != "8") {
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hdrScale = g_normalize ? 1.0f / maxValue : 1.0f;
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}
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break;
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}
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if (g_normalize) maxValue /= float(4.0 * M_PI / 683.0);
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const size_t w = image.getWidth();
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const size_t h = image.getHeight();
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for (size_t y = 0; y < h; y++) {
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float3* UTILS_RESTRICT data = image.get<float3>(0, (uint32_t) y);
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for (size_t x = 0; x < w; x++, data++) {
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if (y >= h / 2) {
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*data = g_groundAlbedo * jobData.integral;
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}
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*data *= hdrScale;
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if (g_tonemap) {
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*data = tonemapACES(*data);
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}
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if (g_gammaCorrect) {
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*data = image::sRGBToLinear(*data);
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}
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}
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}
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printf("Information\n");
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printf(" Max radiance: %.2f W/(m^2.sr.nm)\n", maxValue);
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printf(" Max luminance: %.2f nt\n", maxValue * 683.0f);
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printf(" Max illuminance: %.2f lx\n", maxValue * 683.0f * 2.0 * M_PI);
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printf("\n");
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printf("Rendering parameters\n");
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printf(" Luminance multiplier: %.2f\n", (1.0f / hdrScale) * 683.0f);
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printf("\n");
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}
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static void printUsage(const char* name) {
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std::string execName(Path(name).getName());
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std::string usage(
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"SKYGEN generates an environment map of a simulated sky\n"
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"Usage:\n"
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" SKYGEN [options] <output>\n"
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"\n"
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"Options:\n"
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" --help, -h\n"
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" print this message\n\n"
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" --license\n"
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" Print copyright and license information\n\n"
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" --format=[exr|hdr|rgbm|rgb32f|psd|png|dds], -f [exr|hdr|rgbm|rgb32f|psd|png|dds]\n"
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" specify output file format, inferred from file name if omitted\n\n"
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" --compression=COMPRESSION, -c COMPRESSION\n"
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" format specific compression:\n"
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" PNG: Ignored\n"
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" Radiance: Ignored\n"
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" Photoshop: 16 (default), 32\n"
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" OpenEXR: RAW, RLE, ZIPS, ZIP, PIZ (default)\n"
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" DDS: 8, 16 (default), 32\n\n"
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" --width=WIDTH, -w WIDTH\n"
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" specify the width in pixels of the generated environment map\n"
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" the default width is 4096px\n\n"
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" --turbidity=[1.0..11.0], -t [1.0..11.0]\n"
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" specify the atmospheric turbidity, default is 4.0\n\n"
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" --elevation=ELEVATION, -e ELEVATION\n"
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" specify the sun elevation in degrees, default is 45.0\n\n"
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" --azimuth=AZIMUTH, -a AZIMUTH\n"
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" specify the sun azimuth in degrees, default is 0.0 (-Z)\n\n"
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" --ground=ALBEDO, -g ALBEDO\n"
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" specify the ground albedo, between 0.0 and 1.0, default is 0.25\n\n"
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" --normalize, -n\n"
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" normalizes output values between 0.0 and 1.0 (implied with PNG)\n\n"
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" --tonemap, -m\n"
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" tone-mapped output (implied with PNG)\n\n"
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" --srgb, -s\n"
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" applies sRGB gamma correction (implies --normalize, implied with PNG)\n\n"
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);
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const std::string from("SKYGEN");
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for (size_t pos = usage.find(from); pos != std::string::npos; pos = usage.find(from, pos)) {
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usage.replace(pos, from.length(), execName);
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}
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printf("%s", usage.c_str());
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}
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static void license() {
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std::cout <<
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#include "licenses/licenses.inc"
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;
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}
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static int handleArguments(int argc, char* argv[]) {
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static constexpr const char* OPTSTR = "hf:c:w:t:e:a:sg:mns";
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static const struct option OPTIONS[] = {
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{ "help", no_argument, nullptr, 'h' },
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{ "license", no_argument, nullptr, 'l' },
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{ "format", required_argument, nullptr, 'f' },
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{ "compression", required_argument, nullptr, 'c' },
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{ "width", required_argument, nullptr, 'w' },
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{ "turbidity", required_argument, nullptr, 't' },
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{ "elevation", required_argument, nullptr, 'e' },
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{ "azimuth", required_argument, nullptr, 'a' },
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{ "ground", required_argument, nullptr, 'g' },
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{ "tonemap", no_argument, nullptr, 'm' },
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{ "normalize", no_argument, nullptr, 'n' },
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{ "srgb", no_argument, nullptr, 's' },
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{ nullptr, 0, nullptr, 0 } // termination of the option list
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};
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int opt;
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int optionIndex = 0;
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while ((opt = getopt_long(argc, argv, OPTSTR, OPTIONS, &optionIndex)) >= 0) {
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std::string arg(optarg ? optarg : "");
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switch (opt) {
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default:
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case 'h':
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printUsage(argv[0]);
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exit(0);
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// break;
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case 'l':
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license();
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exit(0);
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// break;
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case 'f':
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if (arg == "png") {
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g_format = ImageEncoder::Format::PNG;
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g_formatSpecified = true;
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}
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if (arg == "hdr") {
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g_format = ImageEncoder::Format::HDR;
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g_formatSpecified = true;
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}
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if (arg == "rgbm") {
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g_format = ImageEncoder::Format::RGBM;
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g_formatSpecified = true;
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}
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if (arg == "rgb32f") {
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g_format = ImageEncoder::Format::RGB_10_11_11_REV;
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g_formatSpecified = true;
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}
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if (arg == "exr") {
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g_format = ImageEncoder::Format::EXR;
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g_formatSpecified = true;
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}
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if (arg == "psd") {
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g_format = ImageEncoder::Format::PSD;
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g_formatSpecified = true;
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}
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if (arg == "dds") {
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g_format = ImageEncoder::Format::DDS_LINEAR;
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g_formatSpecified = true;
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}
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break;
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case 'c':
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g_compression = arg;
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break;
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case 'w': {
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long width = strtol(arg.c_str(), nullptr, 10);
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if (width > 2) {
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g_outputWidth = (uint32_t) width;
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}
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break;
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}
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case 't':
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g_turbidity = clamp(strtof(arg.c_str(), nullptr), 1.0f, 11.0f);
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break;
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case 'e':
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g_elevation = (float) (strtof(arg.c_str(), nullptr) * M_PI / 180.0);
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break;
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case 'a':
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g_azimuth = (float) (strtof(arg.c_str(), nullptr) * M_PI / 180.0);
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break;
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case 'g':
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g_groundAlbedo = clamp(strtof(arg.c_str(), nullptr), 0.0f, 1.0f);
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break;
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case 'm':
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g_tonemap = true;
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break;
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case 'n':
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g_normalize = true;
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break;
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case 's':
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g_gammaCorrect = true;
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break;
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}
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}
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return optind;
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}
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int main(int argc, char* argv[]) {
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int optionIndex = handleArguments(argc, argv);
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int numArgs = argc - optionIndex;
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if (numArgs < 1) {
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printUsage(argv[0]);
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return 1;
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}
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Path outputMap(argv[optionIndex]);
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// guess the format from the file name
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if (!g_formatSpecified) {
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g_format = ImageEncoder::chooseFormat(outputMap, false);
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}
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// normalize output for formats that can only encode data between 0 and 1
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if (g_format == ImageEncoder::Format::PNG
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|| (g_format == ImageEncoder::Format::DDS && g_compression == "8")) {
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g_normalize = true;
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}
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// tonemap 8 bit formats
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if (g_format == ImageEncoder::Format::PNG) {
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g_tonemap = true;
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}
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if (g_gammaCorrect) {
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g_normalize = true;
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}
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// the aspect ratio is always 2:1 for equirectangular environment maps
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const uint32_t width = g_outputWidth;
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const uint32_t height = std::max(1u, g_outputWidth >> 1);
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// allocate map
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LinearImage image(width, height, 3);
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// render the sky and sun disk
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generateSky(image);
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// write the environment map to disk
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std::ofstream outputStream(outputMap, std::ios::binary | std::ios::trunc);
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if (!outputStream.good()) {
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std::cerr << "The output file cannot be opened: " << outputMap << std::endl;
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} else {
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ImageEncoder::encode(outputStream, g_format, image, g_compression, outputMap.getPath());
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outputStream.close();
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if (!outputStream.good()) {
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std::cerr << "An error occurred while writing the output file: " << outputMap <<
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std::endl;
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}
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}
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}
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