Compare commits
11 Commits
granade/cl
...
ma/rainbow
| Author | SHA1 | Date | |
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c410acb69f | ||
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cb9eba3b3e | ||
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dcf51ba20e | ||
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73e6ccad96 | ||
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ad5c409317 | ||
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db597af272 | ||
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4a46955bfb | ||
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864bc3c1c1 | ||
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2da395caf8 |
@@ -822,6 +822,7 @@ if (IS_HOST_PLATFORM)
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endif()
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add_subdirectory(${TOOLS}/mipgen)
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add_subdirectory(${TOOLS}/normal-blending)
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add_subdirectory(${TOOLS}/rainbowgen)
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add_subdirectory(${TOOLS}/resgen)
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add_subdirectory(${TOOLS}/rgb-to-lmsr)
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add_subdirectory(${TOOLS}/roughness-prefilter)
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30
tools/rainbowgen/CMakeLists.txt
Normal file
30
tools/rainbowgen/CMakeLists.txt
Normal file
@@ -0,0 +1,30 @@
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cmake_minimum_required(VERSION 3.19)
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project(rainbowgen)
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set(TARGET rainbowgen)
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# ==================================================================================================
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# Source files
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# ==================================================================================================
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set(SRCS src/rainbowgen.cpp
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src/RainbowGenerator.cpp)
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# ==================================================================================================
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# Target definitions
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# ==================================================================================================
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add_executable(${TARGET} ${SRCS})
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target_link_libraries(${TARGET} PRIVATE math utils getopt image imageio)
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set_target_properties(${TARGET} PROPERTIES FOLDER Tools)
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# =================================================================================================
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# Licenses
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# ==================================================================================================
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set(MODULE_LICENSES getopt)
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set(GENERATION_ROOT ${CMAKE_CURRENT_BINARY_DIR}/generated)
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list_licenses(${GENERATION_ROOT}/licenses/licenses.inc ${MODULE_LICENSES})
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target_include_directories(${TARGET} PRIVATE ${GENERATION_ROOT})
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# ==================================================================================================
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# Installation
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# ==================================================================================================
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install(TARGETS ${TARGET} RUNTIME DESTINATION bin)
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596
tools/rainbowgen/src/CIE.h
Normal file
596
tools/rainbowgen/src/CIE.h
Normal file
@@ -0,0 +1,596 @@
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/*
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* Copyright (C) 2024 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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#ifndef TNT_CIE_H
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#define TNT_CIE_H
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#include <math/vec3.h>
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#include <stddef.h>
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using namespace filament::math;
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// CIE 2006 10-deg color matching functions (CMFs), from 390nm to 830nm, at 1nm intervals
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//
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// Data source:
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// http://www.cvrl.org/ciexyzpr.htm
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const size_t CIE_XYZ_START = 390;
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const size_t CIE_XYZ_COUNT = 441;
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const float3 CIE_XYZ[CIE_XYZ_COUNT] = { // NOLINT
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{ 2.952420E-03f, 4.076779E-04f, 1.318752E-02f },
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{ 3.577275E-03f, 4.977769E-04f, 1.597879E-02f },
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||||
{ 4.332146E-03f, 6.064754E-04f, 1.935758E-02f },
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||||
{ 5.241609E-03f, 7.370040E-04f, 2.343758E-02f },
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||||
{ 6.333902E-03f, 8.929388E-04f, 2.835021E-02f },
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||||
{ 7.641137E-03f, 1.078166E-03f, 3.424588E-02f },
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||||
{ 9.199401E-03f, 1.296816E-03f, 4.129467E-02f },
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||||
{ 1.104869E-02f, 1.553159E-03f, 4.968641E-02f },
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||||
{ 1.323262E-02f, 1.851463E-03f, 5.962964E-02f },
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||||
{ 1.579791E-02f, 2.195795E-03f, 7.134926E-02f },
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||||
{ 1.879338E-02f, 2.589775E-03f, 8.508254E-02f },
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||||
{ 2.226949E-02f, 3.036799E-03f, 1.010753E-01f },
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||||
{ 2.627978E-02f, 3.541926E-03f, 1.195838E-01f },
|
||||
{ 3.087862E-02f, 4.111422E-03f, 1.408647E-01f },
|
||||
{ 3.611890E-02f, 4.752618E-03f, 1.651644E-01f },
|
||||
{ 4.204986E-02f, 5.474207E-03f, 1.927065E-01f },
|
||||
{ 4.871256E-02f, 6.285034E-03f, 2.236782E-01f },
|
||||
{ 5.612868E-02f, 7.188068E-03f, 2.582109E-01f },
|
||||
{ 6.429866E-02f, 8.181786E-03f, 2.963632E-01f },
|
||||
{ 7.319818E-02f, 9.260417E-03f, 3.381018E-01f },
|
||||
{ 8.277331E-02f, 1.041303E-02f, 3.832822E-01f },
|
||||
{ 9.295327E-02f, 1.162642E-02f, 4.316884E-01f },
|
||||
{ 1.037137E-01f, 1.289884E-02f, 4.832440E-01f },
|
||||
{ 1.150520E-01f, 1.423442E-02f, 5.379345E-01f },
|
||||
{ 1.269771E-01f, 1.564080E-02f, 5.957740E-01f },
|
||||
{ 1.395127E-01f, 1.712968E-02f, 6.568187E-01f },
|
||||
{ 1.526661E-01f, 1.871265E-02f, 7.210459E-01f },
|
||||
{ 1.663054E-01f, 2.038394E-02f, 7.878635E-01f },
|
||||
{ 1.802197E-01f, 2.212935E-02f, 8.563391E-01f },
|
||||
{ 1.941448E-01f, 2.392985E-02f, 9.253017E-01f },
|
||||
{ 2.077647E-01f, 2.576133E-02f, 9.933444E-01f },
|
||||
{ 2.207911E-01f, 2.760156E-02f, 1.059178E+00f },
|
||||
{ 2.332355E-01f, 2.945513E-02f, 1.122832E+00f },
|
||||
{ 2.452462E-01f, 3.133884E-02f, 1.184947E+00f },
|
||||
{ 2.570397E-01f, 3.327575E-02f, 1.246476E+00f },
|
||||
{ 2.688989E-01f, 3.529554E-02f, 1.308674E+00f },
|
||||
{ 2.810677E-01f, 3.742705E-02f, 1.372628E+00f },
|
||||
{ 2.933967E-01f, 3.967137E-02f, 1.437661E+00f },
|
||||
{ 3.055933E-01f, 4.201998E-02f, 1.502449E+00f },
|
||||
{ 3.173165E-01f, 4.446166E-02f, 1.565456E+00f },
|
||||
{ 3.281798E-01f, 4.698226E-02f, 1.624940E+00f },
|
||||
{ 3.378678E-01f, 4.956742E-02f, 1.679488E+00f },
|
||||
{ 3.465097E-01f, 5.221219E-02f, 1.729668E+00f },
|
||||
{ 3.543953E-01f, 5.491387E-02f, 1.776755E+00f },
|
||||
{ 3.618655E-01f, 5.766919E-02f, 1.822228E+00f },
|
||||
{ 3.693084E-01f, 6.047429E-02f, 1.867751E+00f },
|
||||
{ 3.770107E-01f, 6.332195E-02f, 1.914504E+00f },
|
||||
{ 3.846850E-01f, 6.619271E-02f, 1.961055E+00f },
|
||||
{ 3.918591E-01f, 6.906185E-02f, 2.005136E+00f },
|
||||
{ 3.980192E-01f, 7.190190E-02f, 2.044296E+00f },
|
||||
{ 4.026189E-01f, 7.468288E-02f, 2.075946E+00f },
|
||||
{ 4.052637E-01f, 7.738452E-02f, 2.098231E+00f },
|
||||
{ 4.062482E-01f, 8.003601E-02f, 2.112591E+00f },
|
||||
{ 4.060660E-01f, 8.268524E-02f, 2.121427E+00f },
|
||||
{ 4.052283E-01f, 8.538745E-02f, 2.127239E+00f },
|
||||
{ 4.042529E-01f, 8.820537E-02f, 2.132574E+00f },
|
||||
{ 4.034808E-01f, 9.118925E-02f, 2.139093E+00f },
|
||||
{ 4.025362E-01f, 9.431041E-02f, 2.144815E+00f },
|
||||
{ 4.008675E-01f, 9.751346E-02f, 2.146832E+00f },
|
||||
{ 3.979327E-01f, 1.007349E-01f, 2.142250E+00f },
|
||||
{ 3.932139E-01f, 1.039030E-01f, 2.128264E+00f },
|
||||
{ 3.864108E-01f, 1.069639E-01f, 2.103205E+00f },
|
||||
{ 3.779513E-01f, 1.099676E-01f, 2.069388E+00f },
|
||||
{ 3.684176E-01f, 1.129992E-01f, 2.030030E+00f },
|
||||
{ 3.583473E-01f, 1.161541E-01f, 1.988178E+00f },
|
||||
{ 3.482214E-01f, 1.195389E-01f, 1.946651E+00f },
|
||||
{ 3.383830E-01f, 1.232503E-01f, 1.907521E+00f },
|
||||
{ 3.288309E-01f, 1.273047E-01f, 1.870689E+00f },
|
||||
{ 3.194977E-01f, 1.316964E-01f, 1.835578E+00f },
|
||||
{ 3.103345E-01f, 1.364178E-01f, 1.801657E+00f },
|
||||
{ 3.013112E-01f, 1.414586E-01f, 1.768440E+00f },
|
||||
{ 2.923754E-01f, 1.468003E-01f, 1.735338E+00f },
|
||||
{ 2.833273E-01f, 1.524002E-01f, 1.701254E+00f },
|
||||
{ 2.739463E-01f, 1.582021E-01f, 1.665053E+00f },
|
||||
{ 2.640352E-01f, 1.641400E-01f, 1.625712E+00f },
|
||||
{ 2.534221E-01f, 1.701373E-01f, 1.582342E+00f },
|
||||
{ 2.420135E-01f, 1.761233E-01f, 1.534439E+00f },
|
||||
{ 2.299346E-01f, 1.820896E-01f, 1.482544E+00f },
|
||||
{ 2.173617E-01f, 1.880463E-01f, 1.427438E+00f },
|
||||
{ 2.044672E-01f, 1.940065E-01f, 1.369876E+00f },
|
||||
{ 1.914176E-01f, 1.999859E-01f, 1.310576E+00f },
|
||||
{ 1.783672E-01f, 2.060054E-01f, 1.250226E+00f },
|
||||
{ 1.654407E-01f, 2.120981E-01f, 1.189511E+00f },
|
||||
{ 1.527391E-01f, 2.183041E-01f, 1.129050E+00f },
|
||||
{ 1.403439E-01f, 2.246686E-01f, 1.069379E+00f },
|
||||
{ 1.283167E-01f, 2.312426E-01f, 1.010952E+00f },
|
||||
{ 1.167124E-01f, 2.380741E-01f, 9.541809E-01f },
|
||||
{ 1.056121E-01f, 2.451798E-01f, 8.995253E-01f },
|
||||
{ 9.508569E-02f, 2.525682E-01f, 8.473720E-01f },
|
||||
{ 8.518206E-02f, 2.602479E-01f, 7.980093E-01f },
|
||||
{ 7.593120E-02f, 2.682271E-01f, 7.516389E-01f },
|
||||
{ 6.733159E-02f, 2.765005E-01f, 7.082645E-01f },
|
||||
{ 5.932018E-02f, 2.850035E-01f, 6.673867E-01f },
|
||||
{ 5.184106E-02f, 2.936475E-01f, 6.284798E-01f },
|
||||
{ 4.486119E-02f, 3.023319E-01f, 5.911174E-01f },
|
||||
{ 3.836770E-02f, 3.109438E-01f, 5.549619E-01f },
|
||||
{ 3.237296E-02f, 3.194105E-01f, 5.198843E-01f },
|
||||
{ 2.692095E-02f, 3.278683E-01f, 4.862772E-01f },
|
||||
{ 2.204070E-02f, 3.365263E-01f, 4.545497E-01f },
|
||||
{ 1.773951E-02f, 3.456176E-01f, 4.249955E-01f },
|
||||
{ 1.400745E-02f, 3.554018E-01f, 3.978114E-01f },
|
||||
{ 1.082291E-02f, 3.660893E-01f, 3.730218E-01f },
|
||||
{ 8.168996E-03f, 3.775857E-01f, 3.502618E-01f },
|
||||
{ 6.044623E-03f, 3.896960E-01f, 3.291407E-01f },
|
||||
{ 4.462638E-03f, 4.021947E-01f, 3.093356E-01f },
|
||||
{ 3.446810E-03f, 4.148227E-01f, 2.905816E-01f },
|
||||
{ 3.009513E-03f, 4.273539E-01f, 2.726773E-01f },
|
||||
{ 3.090744E-03f, 4.398206E-01f, 2.555143E-01f },
|
||||
{ 3.611221E-03f, 4.523360E-01f, 2.390188E-01f },
|
||||
{ 4.491435E-03f, 4.650298E-01f, 2.231335E-01f },
|
||||
{ 5.652072E-03f, 4.780482E-01f, 2.078158E-01f },
|
||||
{ 7.035322E-03f, 4.915173E-01f, 1.930407E-01f },
|
||||
{ 8.669631E-03f, 5.054224E-01f, 1.788089E-01f },
|
||||
{ 1.060755E-02f, 5.197057E-01f, 1.651287E-01f },
|
||||
{ 1.290468E-02f, 5.343012E-01f, 1.520103E-01f },
|
||||
{ 1.561956E-02f, 5.491344E-01f, 1.394643E-01f },
|
||||
{ 1.881640E-02f, 5.641302E-01f, 1.275353E-01f },
|
||||
{ 2.256923E-02f, 5.792416E-01f, 1.163771E-01f },
|
||||
{ 2.694456E-02f, 5.944264E-01f, 1.061161E-01f },
|
||||
{ 3.199910E-02f, 6.096388E-01f, 9.682266E-02f },
|
||||
{ 3.778185E-02f, 6.248296E-01f, 8.852389E-02f },
|
||||
{ 4.430635E-02f, 6.399656E-01f, 8.118263E-02f },
|
||||
{ 5.146516E-02f, 6.550943E-01f, 7.463132E-02f },
|
||||
{ 5.912224E-02f, 6.702903E-01f, 6.870644E-02f },
|
||||
{ 6.714220E-02f, 6.856375E-01f, 6.327834E-02f },
|
||||
{ 7.538941E-02f, 7.012292E-01f, 5.824484E-02f },
|
||||
{ 8.376697E-02f, 7.171103E-01f, 5.353812E-02f },
|
||||
{ 9.233581E-02f, 7.330917E-01f, 4.914863E-02f },
|
||||
{ 1.011940E-01f, 7.489041E-01f, 4.507511E-02f },
|
||||
{ 1.104362E-01f, 7.642530E-01f, 4.131175E-02f },
|
||||
{ 1.201511E-01f, 7.788199E-01f, 3.784916E-02f },
|
||||
{ 1.303960E-01f, 7.923410E-01f, 3.467234E-02f },
|
||||
{ 1.411310E-01f, 8.048510E-01f, 3.175471E-02f },
|
||||
{ 1.522944E-01f, 8.164747E-01f, 2.907029E-02f },
|
||||
{ 1.638288E-01f, 8.273520E-01f, 2.659651E-02f },
|
||||
{ 1.756832E-01f, 8.376358E-01f, 2.431375E-02f },
|
||||
{ 1.878114E-01f, 8.474653E-01f, 2.220677E-02f },
|
||||
{ 2.001621E-01f, 8.568868E-01f, 2.026852E-02f },
|
||||
{ 2.126822E-01f, 8.659242E-01f, 1.849246E-02f },
|
||||
{ 2.253199E-01f, 8.746041E-01f, 1.687084E-02f },
|
||||
{ 2.380254E-01f, 8.829552E-01f, 1.539505E-02f },
|
||||
{ 2.507787E-01f, 8.910274E-01f, 1.405450E-02f },
|
||||
{ 2.636778E-01f, 8.989495E-01f, 1.283354E-02f },
|
||||
{ 2.768607E-01f, 9.068753E-01f, 1.171754E-02f },
|
||||
{ 2.904792E-01f, 9.149652E-01f, 1.069415E-02f },
|
||||
{ 3.046991E-01f, 9.233858E-01f, 9.753000E-03f },
|
||||
{ 3.196485E-01f, 9.322325E-01f, 8.886096E-03f },
|
||||
{ 3.352447E-01f, 9.412862E-01f, 8.089323E-03f },
|
||||
{ 3.513290E-01f, 9.502378E-01f, 7.359131E-03f },
|
||||
{ 3.677148E-01f, 9.587647E-01f, 6.691736E-03f },
|
||||
{ 3.841856E-01f, 9.665325E-01f, 6.083223E-03f },
|
||||
{ 4.005312E-01f, 9.732504E-01f, 5.529423E-03f },
|
||||
{ 4.166669E-01f, 9.788415E-01f, 5.025504E-03f },
|
||||
{ 4.325420E-01f, 9.832867E-01f, 4.566879E-03f },
|
||||
{ 4.481063E-01f, 9.865720E-01f, 4.149405E-03f },
|
||||
{ 4.633109E-01f, 9.886887E-01f, 3.769336E-03f },
|
||||
{ 4.781440E-01f, 9.897056E-01f, 3.423302E-03f },
|
||||
{ 4.927483E-01f, 9.899849E-01f, 3.108313E-03f },
|
||||
{ 5.073315E-01f, 9.899624E-01f, 2.821650E-03f },
|
||||
{ 5.221315E-01f, 9.900731E-01f, 2.560830E-03f },
|
||||
{ 5.374170E-01f, 9.907500E-01f, 2.323578E-03f },
|
||||
{ 5.534217E-01f, 9.922826E-01f, 2.107847E-03f },
|
||||
{ 5.701242E-01f, 9.943837E-01f, 1.911867E-03f },
|
||||
{ 5.874093E-01f, 9.966221E-01f, 1.734006E-03f },
|
||||
{ 6.051269E-01f, 9.985649E-01f, 1.572736E-03f },
|
||||
{ 6.230892E-01f, 9.997775E-01f, 1.426627E-03f },
|
||||
{ 6.410999E-01f, 9.999440E-01f, 1.294325E-03f },
|
||||
{ 6.590659E-01f, 9.992200E-01f, 1.174475E-03f },
|
||||
{ 6.769436E-01f, 9.978793E-01f, 1.065842E-03f },
|
||||
{ 6.947143E-01f, 9.961934E-01f, 9.673215E-04f },
|
||||
{ 7.123849E-01f, 9.944304E-01f, 8.779264E-04f },
|
||||
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|
||||
{ 3.874992E-05f, 1.520262E-05f, 0.000000E+00f },
|
||||
{ 3.633762E-05f, 1.426169E-05f, 0.000000E+00f },
|
||||
{ 3.407653E-05f, 1.337946E-05f, 0.000000E+00f },
|
||||
{ 3.195242E-05f, 1.255038E-05f, 0.000000E+00f },
|
||||
{ 2.995808E-05f, 1.177169E-05f, 0.000000E+00f },
|
||||
{ 2.808781E-05f, 1.104118E-05f, 0.000000E+00f },
|
||||
{ 2.633581E-05f, 1.035662E-05f, 0.000000E+00f },
|
||||
{ 2.469630E-05f, 9.715798E-06f, 0.000000E+00f },
|
||||
{ 2.316311E-05f, 9.116316E-06f, 0.000000E+00f },
|
||||
{ 2.172855E-05f, 8.555201E-06f, 0.000000E+00f },
|
||||
{ 2.038519E-05f, 8.029561E-06f, 0.000000E+00f },
|
||||
{ 1.912625E-05f, 7.536768E-06f, 0.000000E+00f },
|
||||
{ 1.794555E-05f, 7.074424E-06f, 0.000000E+00f },
|
||||
{ 1.683776E-05f, 6.640464E-06f, 0.000000E+00f },
|
||||
{ 1.579907E-05f, 6.233437E-06f, 0.000000E+00f },
|
||||
{ 1.482604E-05f, 5.852035E-06f, 0.000000E+00f },
|
||||
{ 1.391527E-05f, 5.494963E-06f, 0.000000E+00f },
|
||||
{ 1.306345E-05f, 5.160948E-06f, 0.000000E+00f },
|
||||
{ 1.226720E-05f, 4.848687E-06f, 0.000000E+00f },
|
||||
{ 1.152279E-05f, 4.556705E-06f, 0.000000E+00f },
|
||||
{ 1.082663E-05f, 4.283580E-06f, 0.000000E+00f },
|
||||
{ 1.017540E-05f, 4.027993E-06f, 0.000000E+00f },
|
||||
{ 9.565993E-06f, 3.788729E-06f, 0.000000E+00f },
|
||||
{ 8.995405E-06f, 3.564599E-06f, 0.000000E+00f },
|
||||
{ 8.460253E-06f, 3.354285E-06f, 0.000000E+00f },
|
||||
{ 7.957382E-06f, 3.156557E-06f, 0.000000E+00f },
|
||||
{ 7.483997E-06f, 2.970326E-06f, 0.000000E+00f },
|
||||
{ 7.037621E-06f, 2.794625E-06f, 0.000000E+00f },
|
||||
{ 6.616311E-06f, 2.628701E-06f, 0.000000E+00f },
|
||||
{ 6.219265E-06f, 2.472248E-06f, 0.000000E+00f },
|
||||
{ 5.845844E-06f, 2.325030E-06f, 0.000000E+00f },
|
||||
{ 5.495311E-06f, 2.186768E-06f, 0.000000E+00f },
|
||||
{ 5.166853E-06f, 2.057152E-06f, 0.000000E+00f },
|
||||
{ 4.859511E-06f, 1.935813E-06f, 0.000000E+00f },
|
||||
{ 4.571973E-06f, 1.822239E-06f, 0.000000E+00f },
|
||||
{ 4.302920E-06f, 1.715914E-06f, 0.000000E+00f },
|
||||
{ 4.051121E-06f, 1.616355E-06f, 0.000000E+00f },
|
||||
{ 3.815429E-06f, 1.523114E-06f, 0.000000E+00f },
|
||||
{ 3.594719E-06f, 1.435750E-06f, 0.000000E+00f },
|
||||
{ 3.387736E-06f, 1.353771E-06f, 0.000000E+00f },
|
||||
{ 3.193301E-06f, 1.276714E-06f, 0.000000E+00f },
|
||||
{ 3.010363E-06f, 1.204166E-06f, 0.000000E+00f },
|
||||
{ 2.837980E-06f, 1.135758E-06f, 0.000000E+00f },
|
||||
{ 2.675365E-06f, 1.071181E-06f, 0.000000E+00f },
|
||||
{ 2.522020E-06f, 1.010243E-06f, 0.000000E+00f },
|
||||
{ 2.377511E-06f, 9.527779E-07f, 0.000000E+00f },
|
||||
{ 2.241417E-06f, 8.986224E-07f, 0.000000E+00f },
|
||||
{ 2.113325E-06f, 8.476168E-07f, 0.000000E+00f },
|
||||
{ 1.992830E-06f, 7.996052E-07f, 0.000000E+00f },
|
||||
{ 1.879542E-06f, 7.544361E-07f, 0.000000E+00f },
|
||||
{ 1.773083E-06f, 7.119624E-07f, 0.000000E+00f },
|
||||
{ 1.673086E-06f, 6.720421E-07f, 0.000000E+00f },
|
||||
{ 1.579199E-06f, 6.345380E-07f, 0.000000E+00f }
|
||||
};
|
||||
|
||||
// CIE Standard Illuminant D65 relative spectral power distribution,
|
||||
// from 300nm to 830, at 5nm intervals
|
||||
//
|
||||
// Data source:
|
||||
// https://en.wikipedia.org/wiki/Illuminant_D65
|
||||
// https://cielab.xyz/pdf/CIE_sel_colorimetric_tables.xls
|
||||
const size_t CIE_D65_INTERVAL = 5;
|
||||
const size_t CIE_D65_START = 300;
|
||||
const size_t CIE_D65_END = 830;
|
||||
const size_t CIE_D65_COUNT = 107;
|
||||
const float CIE_D65[CIE_D65_COUNT] = {
|
||||
0.0341f,
|
||||
1.6643f,
|
||||
3.2945f,
|
||||
11.7652f,
|
||||
20.2360f,
|
||||
28.6447f,
|
||||
37.0535f,
|
||||
38.5011f,
|
||||
39.9488f,
|
||||
42.4302f,
|
||||
44.9117f,
|
||||
45.7750f,
|
||||
46.6383f,
|
||||
49.3637f,
|
||||
52.0891f,
|
||||
51.0323f,
|
||||
49.9755f,
|
||||
52.3118f,
|
||||
54.6482f,
|
||||
68.7015f,
|
||||
82.7549f,
|
||||
87.1204f,
|
||||
91.4860f,
|
||||
92.4589f,
|
||||
93.4318f,
|
||||
90.0570f,
|
||||
86.6823f,
|
||||
95.7736f,
|
||||
104.865f,
|
||||
110.936f,
|
||||
117.008f,
|
||||
117.410f,
|
||||
117.812f,
|
||||
116.336f,
|
||||
114.861f,
|
||||
115.392f,
|
||||
115.923f,
|
||||
112.367f,
|
||||
108.811f,
|
||||
109.082f,
|
||||
109.354f,
|
||||
108.578f,
|
||||
107.802f,
|
||||
106.296f,
|
||||
104.790f,
|
||||
106.239f,
|
||||
107.689f,
|
||||
106.047f,
|
||||
104.405f,
|
||||
104.225f,
|
||||
104.046f,
|
||||
102.023f,
|
||||
100.000f,
|
||||
98.1671f,
|
||||
96.3342f,
|
||||
96.0611f,
|
||||
95.7880f,
|
||||
92.2368f,
|
||||
88.6856f,
|
||||
89.3459f,
|
||||
90.0062f,
|
||||
89.8026f,
|
||||
89.5991f,
|
||||
88.6489f,
|
||||
87.6987f,
|
||||
85.4936f,
|
||||
83.2886f,
|
||||
83.4939f,
|
||||
83.6992f,
|
||||
81.8630f,
|
||||
80.0268f,
|
||||
80.1207f,
|
||||
80.2146f,
|
||||
81.2462f,
|
||||
82.2778f,
|
||||
80.2810f,
|
||||
78.2842f,
|
||||
74.0027f,
|
||||
69.7213f,
|
||||
70.6652f,
|
||||
71.6091f,
|
||||
72.9790f,
|
||||
74.3490f,
|
||||
67.9765f,
|
||||
61.6040f,
|
||||
65.7448f,
|
||||
69.8856f,
|
||||
72.4863f,
|
||||
75.0870f,
|
||||
69.3398f,
|
||||
63.5927f,
|
||||
55.0054f,
|
||||
46.4182f,
|
||||
56.6118f,
|
||||
66.8054f,
|
||||
65.0941f,
|
||||
63.3828f,
|
||||
63.8434f,
|
||||
64.3040f,
|
||||
61.8779f,
|
||||
59.4519f,
|
||||
55.7054f,
|
||||
51.9590f,
|
||||
54.6998f,
|
||||
57.4406f,
|
||||
58.8765f,
|
||||
60.3125f
|
||||
};
|
||||
|
||||
#endif //TNT_CIE_H
|
||||
181
tools/rainbowgen/src/RainbowGenerator.cpp
Normal file
181
tools/rainbowgen/src/RainbowGenerator.cpp
Normal file
@@ -0,0 +1,181 @@
|
||||
/*
|
||||
* Copyright (C) 2024 The Android Open Source Project
|
||||
*
|
||||
* Licensed under the Apache License, Version 2.0 (the "License");
|
||||
* you may not use this file except in compliance with the License.
|
||||
* You may obtain a copy of the License at
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
*/
|
||||
|
||||
#include "RainbowGenerator.h"
|
||||
#include "CIE.h"
|
||||
#include "rainbow.h"
|
||||
#include "srgb.h"
|
||||
|
||||
#include <utils/JobSystem.h>
|
||||
|
||||
#include <math/vec3.h>
|
||||
|
||||
#include <algorithm>
|
||||
#include <cmath>
|
||||
#include <random>
|
||||
#include <vector>
|
||||
#include <iostream>
|
||||
|
||||
#include <stdint.h>
|
||||
#include <stddef.h>
|
||||
|
||||
using namespace utils;
|
||||
using namespace filament::math;
|
||||
using namespace rainbow;
|
||||
|
||||
RainbowGenerator::RainbowGenerator() = default;
|
||||
|
||||
RainbowGenerator::~RainbowGenerator() = default;
|
||||
|
||||
RainbowGenerator& RainbowGenerator::lut(uint32_t count) noexcept {
|
||||
mLutSize = count;
|
||||
return *this;
|
||||
}
|
||||
|
||||
RainbowGenerator& RainbowGenerator::cosine(bool enabled) noexcept {
|
||||
mCosine = enabled;
|
||||
return *this;
|
||||
}
|
||||
|
||||
RainbowGenerator& RainbowGenerator::minDeviation(radian_t min) noexcept {
|
||||
mMinDeviation = min;
|
||||
return *this;
|
||||
}
|
||||
|
||||
RainbowGenerator& RainbowGenerator::maxDeviation(radian_t max) noexcept {
|
||||
mMaxDeviation = max;
|
||||
return *this;
|
||||
}
|
||||
|
||||
RainbowGenerator& RainbowGenerator::samples(uint32_t count) noexcept {
|
||||
mSampleCount = count;
|
||||
return *this;
|
||||
}
|
||||
|
||||
RainbowGenerator& RainbowGenerator::temperature(celcius_t t) noexcept {
|
||||
mAirTemperature = t;
|
||||
return *this;
|
||||
}
|
||||
|
||||
RainbowGenerator& RainbowGenerator::sunArc(radian_t arc) noexcept {
|
||||
mSunArc = arc;
|
||||
return *this;
|
||||
}
|
||||
|
||||
Rainbow RainbowGenerator::build(JobSystem&) {
|
||||
uint32_t const lutsize = mLutSize;
|
||||
float const minDeviation = mMinDeviation;
|
||||
float const maxDeviation = mMaxDeviation;
|
||||
|
||||
// The sun appears as about a degree in the sky
|
||||
std::default_random_engine rng{ std::random_device{}() };
|
||||
std::uniform_real_distribution<float> distImpactAngle{ -mSunArc * 0.5f, mSunArc * 0.5f };
|
||||
std::uniform_real_distribution<float> distImpact{ -1.0f, 1.0f };
|
||||
std::uniform_int_distribution<int> distWavelengthIndex{ 0, CIE_XYZ_COUNT - 1 };
|
||||
|
||||
int32_t const count = int32_t(mSampleCount);
|
||||
|
||||
float C0, C1;
|
||||
if (mCosine) {
|
||||
float const min = 1.0f - std::cos(minDeviation);
|
||||
float const max = 1.0f - std::cos(maxDeviation);
|
||||
C0 = -1.0f / (max - min);
|
||||
C1 = (1.0f - min) / (max - min);
|
||||
} else {
|
||||
C0 = 1.0f / (maxDeviation - minDeviation);
|
||||
C1 = -minDeviation * C0;
|
||||
}
|
||||
|
||||
Rainbow rainbow{
|
||||
.s = C0,
|
||||
.o = C1,
|
||||
.scale = 0.0f,
|
||||
.data = std::vector<Rainbow::linear_sRGB_t>(lutsize, Rainbow::linear_sRGB_t{})
|
||||
};
|
||||
|
||||
for (size_t i = 0; i < count; i++) {
|
||||
// pick a random ray
|
||||
float const impact = distImpact(rng);
|
||||
radian_t const impactAngle = distImpactAngle(rng);
|
||||
size_t const j = distWavelengthIndex(rng);
|
||||
float const w = float(CIE_XYZ_START + j);
|
||||
float const n = indexOfRefraction(w);
|
||||
|
||||
// incident = asin(impact) - impactAngle. However, because we're integrating
|
||||
// over all impact values at all impact-angles, we don't need to subtract
|
||||
// the impactAngle, because there will always be another {impact, impact-angle}
|
||||
// that will produce the same result
|
||||
radian_t const incident = std::asin(impact);
|
||||
radian_t const refracted = refractFromImpact(n, impact);
|
||||
// water-air fresnel is equal to 1 - air-water fresnel, so we only need to
|
||||
// air-water non-polarized fresnel
|
||||
|
||||
// intensity reflected upon entering the droplet (air-water)
|
||||
float const Raw = fresnel(incident, refracted);
|
||||
|
||||
// intensity reflected upon exiting the droplet (water-air)
|
||||
float const Rwa = fresnel(refracted, incident);
|
||||
|
||||
// intensity transmitted at air-water interface
|
||||
float const Taw = 1 - Raw;
|
||||
|
||||
// intensity transmitted at water-air interface
|
||||
float const Twa = 1 - Rwa;
|
||||
|
||||
for (int const bounces: { 1, 2 }) {
|
||||
radian_t const phi = rainbow::deviation(bounces, incident, refracted) - impactAngle;
|
||||
if (phi >= minDeviation && phi < maxDeviation) {
|
||||
float const v = mCosine ? std::cos(phi) : phi;
|
||||
size_t const index = size_t(std::floor(float(lutsize) * (v * C0 + C1)));
|
||||
if (index < lutsize) {
|
||||
float const T = Taw * std::pow(Rwa, float(bounces)) * Twa;
|
||||
rainbow.data[index] += T * CIE_XYZ[j];
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// convert to sRGB linear and find the largest value
|
||||
for (float3& c : rainbow.data) {
|
||||
c = srgb::XYZ_to_sRGB(c);
|
||||
rainbow.scale = std::max({ rainbow.scale, c.r, c.g, c.b });
|
||||
}
|
||||
|
||||
// rescale everything to the [0, 1] range
|
||||
for (float3& c : rainbow.data) {
|
||||
c *= 1.0f / rainbow.scale;
|
||||
}
|
||||
|
||||
// integration scale factor (118.518 comes from CIE_XYZ[])
|
||||
double const s = (double(2 * lutsize) /
|
||||
(double(maxDeviation - minDeviation) * double(count * CIE_XYZ_COUNT))) / 118.518;
|
||||
|
||||
rainbow.scale *= float(s);
|
||||
//std::cout << 1/rainbow.scale << std::endl;
|
||||
|
||||
return rainbow;
|
||||
}
|
||||
|
||||
//vec3 sun = frameUniforms.lightColorIntensity.rgb *
|
||||
// (frameUniforms.lightColorIntensity.a * (4.0 * PI));
|
||||
//vec3 direction = normalize(variable_eyeDirection.xyz);
|
||||
//float cosAngle = dot(direction, -frameUniforms.lightDirection);
|
||||
//float angle = acos(cosAngle) * 180.0 / 3.14159;
|
||||
//float first = 35.0;
|
||||
//float range = (60.0 - 35.0);
|
||||
//float s = saturate((angle - first)/range);
|
||||
//int index = int(s * 255);
|
||||
//fragColor.rgb += rainbow[index]*sun;
|
||||
82
tools/rainbowgen/src/RainbowGenerator.h
Normal file
82
tools/rainbowgen/src/RainbowGenerator.h
Normal file
@@ -0,0 +1,82 @@
|
||||
/*
|
||||
* Copyright (C) 2024 The Android Open Source Project
|
||||
*
|
||||
* Licensed under the Apache License, Version 2.0 (the "License");
|
||||
* you may not use this file except in compliance with the License.
|
||||
* You may obtain a copy of the License at
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
*/
|
||||
|
||||
#ifndef TNT_RAINBOWGENERATOR_H
|
||||
#define TNT_RAINBOWGENERATOR_H
|
||||
|
||||
#include <stdint.h>
|
||||
#include <stddef.h>
|
||||
|
||||
#include <math/vec3.h>
|
||||
#include <math/scalar.h>
|
||||
|
||||
#include <vector>
|
||||
|
||||
namespace utils {
|
||||
class JobSystem;
|
||||
};
|
||||
|
||||
struct Rainbow {
|
||||
using linear_sRGB_t = filament::math::float3;
|
||||
float s; // input parameter scale factor
|
||||
float o; // input parameter offset
|
||||
float scale; // output scale factor
|
||||
std::vector<linear_sRGB_t> data;
|
||||
};
|
||||
|
||||
class RainbowGenerator {
|
||||
public:
|
||||
using radian_t = float;
|
||||
using celcius_t = float;
|
||||
|
||||
RainbowGenerator();
|
||||
~RainbowGenerator();
|
||||
|
||||
// LUT size
|
||||
RainbowGenerator& lut(uint32_t count) noexcept;
|
||||
|
||||
// LUT indexed by cosine
|
||||
RainbowGenerator& cosine(bool enabled) noexcept;
|
||||
|
||||
// min deviation
|
||||
RainbowGenerator& minDeviation(radian_t min) noexcept;
|
||||
|
||||
// max deviation
|
||||
RainbowGenerator& maxDeviation(radian_t max) noexcept;
|
||||
|
||||
// number of samples for the calculation
|
||||
RainbowGenerator& samples(uint32_t count) noexcept;
|
||||
|
||||
// air temperature
|
||||
RainbowGenerator& temperature(celcius_t t) noexcept;
|
||||
|
||||
// sun arc
|
||||
RainbowGenerator& sunArc(radian_t arc) noexcept;
|
||||
|
||||
// bulid the rainbow LUT
|
||||
Rainbow build(utils::JobSystem& js);
|
||||
|
||||
private:
|
||||
size_t mLutSize = 256;
|
||||
radian_t mMinDeviation = 30.0f * filament::math::f::DEG_TO_RAD;
|
||||
radian_t mMaxDeviation = 60.0f * filament::math::f::DEG_TO_RAD;
|
||||
radian_t mSunArc = 1.0f * filament::math::f::DEG_TO_RAD;
|
||||
uint32_t mSampleCount = 10'000'000;
|
||||
float mAirTemperature = 20.0f;
|
||||
bool mCosine = false;
|
||||
};
|
||||
|
||||
#endif //TNT_RAINBOWGENERATOR_H
|
||||
98
tools/rainbowgen/src/rainbow.h
Normal file
98
tools/rainbowgen/src/rainbow.h
Normal file
@@ -0,0 +1,98 @@
|
||||
/*
|
||||
* Copyright (C) 2024 The Android Open Source Project
|
||||
*
|
||||
* Licensed under the Apache License, Version 2.0 (the "License");
|
||||
* you may not use this file except in compliance with the License.
|
||||
* You may obtain a copy of the License at
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
*/
|
||||
|
||||
#pragma once
|
||||
|
||||
#include <cmath>
|
||||
|
||||
namespace rainbow {
|
||||
|
||||
using namespace filament::math;
|
||||
|
||||
using radian_t = float;
|
||||
using nanometer_t = float;
|
||||
using celcius_t = float;
|
||||
|
||||
// fresnel at water droplet interface
|
||||
inline float fresnel(radian_t Bi, radian_t Bt) noexcept {
|
||||
float const r_pe = std::sin(Bi - Bt) / std::sin(Bi + Bt);
|
||||
float const r_pa = std::tan(Bi - Bt) / std::tan(Bi + Bt);
|
||||
float const r = 0.5f * (r_pe * r_pe + r_pa * r_pa);
|
||||
return r;
|
||||
}
|
||||
|
||||
// refraction angle
|
||||
inline radian_t refract(float n, radian_t incident) noexcept {
|
||||
return std::asin(std::sin(incident) / n);
|
||||
}
|
||||
|
||||
inline radian_t refractFromImpact(float n, float impact) noexcept {
|
||||
return std::asin(impact / n);
|
||||
}
|
||||
|
||||
// max incident angle for a given index of refraction
|
||||
inline radian_t maxIncidentAngle(float n) noexcept {
|
||||
return std::acos(std::sqrt((n * n - 1.0f) / 3.0f));
|
||||
}
|
||||
|
||||
// deviation: angle between the ray exiting the droplet and the ground
|
||||
// impactAngle: angle between the ground and the incident ray
|
||||
inline radian_t deviation(int bounces, radian_t incident, radian_t refracted) noexcept {
|
||||
// each bounce adds 180 degrees as well as 2*refracted
|
||||
return ((bounces & 1) ? 0.0f : f::PI) +
|
||||
float(2 + 2 * bounces) * refracted - 2.0f * incident;
|
||||
}
|
||||
|
||||
// index of refraction for a wavelength
|
||||
inline float indexOfRefraction(nanometer_t wavelength) noexcept {
|
||||
celcius_t const temperature = 20;
|
||||
constexpr float a0 = 0.244257733;
|
||||
constexpr float a1 = 0.00974634476;
|
||||
constexpr float a2 = -0.00373234996;
|
||||
constexpr float a3 = 0.000268678472;
|
||||
constexpr float a4 = 0.0015892057;
|
||||
constexpr float a5 = 0.00245934259;
|
||||
constexpr float a6 = 0.90070492;
|
||||
constexpr float a7 = -0.0166626219;
|
||||
constexpr float Ts = 273.15; // [K]
|
||||
constexpr float Ps = 1000; // [kg/m3]
|
||||
constexpr float Ls = 589; // [nm]
|
||||
constexpr float Lir = 5.432937;
|
||||
constexpr float Luv = 0.229202;
|
||||
|
||||
float const T = Ts + temperature; // temperature
|
||||
float const P = 998.2; // FIXME: this also depends on the temperature (20)
|
||||
float const L = wavelength;
|
||||
float const T_ = T / Ts;
|
||||
float const P_ = P / Ps;
|
||||
float const L_ = L / Ls;
|
||||
|
||||
float const R =
|
||||
a0 +
|
||||
a1 * P_ +
|
||||
a2 * T_ +
|
||||
a3 * L_ * L_ * T_ +
|
||||
a4 / (L_ * L_) +
|
||||
a5 / ((L_ * L_) - (Luv * Luv)) +
|
||||
a6 / ((L_ * L_) - (Lir * Lir)) +
|
||||
a7 * P_ * P_;
|
||||
|
||||
float const n = std::sqrt((1.0f + 2.0f * R * P_) / (1.0f - R * P_));
|
||||
|
||||
return n;
|
||||
}
|
||||
|
||||
} // namespace rainbow
|
||||
222
tools/rainbowgen/src/rainbowgen.cpp
Normal file
222
tools/rainbowgen/src/rainbowgen.cpp
Normal file
@@ -0,0 +1,222 @@
|
||||
/*
|
||||
* Copyright (C) 2024 The Android Open Source Project
|
||||
*
|
||||
* Licensed under the Apache License, Version 2.0 (the "License");
|
||||
* you may not use this file except in compliance with the License.
|
||||
* You may obtain a copy of the License at
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
*/
|
||||
|
||||
#include "RainbowGenerator.h"
|
||||
|
||||
#include <image/LinearImage.h>
|
||||
#include <imageio/ImageEncoder.h>
|
||||
|
||||
#include <utils/Path.h>
|
||||
#include <utils/JobSystem.h>
|
||||
|
||||
#include <math/vec3.h>
|
||||
#include <math/scalar.h>
|
||||
|
||||
#include <getopt/getopt.h>
|
||||
|
||||
#include <fstream>
|
||||
#include <iostream>
|
||||
#include <string>
|
||||
#include <optional>
|
||||
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
|
||||
using namespace filament::math;
|
||||
using namespace image;
|
||||
|
||||
static const char* USAGE = R"TXT(
|
||||
RAINBOWGEN generates a rainbow:
|
||||
|
||||
Usage:
|
||||
RAINBOWGEN [options] output
|
||||
|
||||
Options:
|
||||
--help, -h
|
||||
Print this message
|
||||
|
||||
--license, -L
|
||||
Print copyright and license information
|
||||
|
||||
--format=[exr|hdr|psd|rgbm|rgb32f|png|dds], -f [format]
|
||||
Specify output file format.
|
||||
|
||||
--cosine, -c
|
||||
LUT indexed by 1-cos(deviation)
|
||||
|
||||
--size=integer, -s integer
|
||||
Size of the output rainbow texture, 256 by default.
|
||||
|
||||
--min-deviation=float, -m float
|
||||
Minimum deviation in degrees encoded in the texture, 30 by default.
|
||||
|
||||
--max-deviation=float, -M float
|
||||
Maximum deviation in degrees encoded in the texture, 60 by default.
|
||||
|
||||
--samples=integer, -S integer
|
||||
Number of samples for the simulation, 10,000,000 by default.
|
||||
|
||||
Private use only:
|
||||
--debug, -d
|
||||
Increases the height of the output texture.
|
||||
|
||||
Examples:
|
||||
RAINBOWGEN -h
|
||||
RAINBOWGEN rainbow.png
|
||||
)TXT";
|
||||
|
||||
static void printUsage(const char* name) {
|
||||
std::string const execName(utils::Path(name).getName());
|
||||
const std::string from("RAINBOWGEN");
|
||||
std::string usage(USAGE);
|
||||
for (size_t pos = usage.find(from); pos != std::string::npos; pos = usage.find(from, pos)) {
|
||||
usage.replace(pos, from.length(), execName);
|
||||
}
|
||||
puts(usage.c_str());
|
||||
}
|
||||
|
||||
static void license() {
|
||||
static const char *license[] = {
|
||||
#include "licenses/licenses.inc"
|
||||
nullptr
|
||||
};
|
||||
|
||||
const char **p = &license[0];
|
||||
while (*p)
|
||||
std::cout << *p++ << std::endl;
|
||||
}
|
||||
|
||||
static std::optional<image::ImageEncoder::Format> g_format;
|
||||
static bool g_debug = false;
|
||||
|
||||
static int handleArguments(int argc, char* argv[], RainbowGenerator& builder) {
|
||||
static constexpr const char* OPTSTR = "hLs:m:M:S:f:dc";
|
||||
static const struct option OPTIONS[] = {
|
||||
{ "help", no_argument, nullptr, 'h' },
|
||||
{ "license", no_argument, nullptr, 'L' },
|
||||
{ "cosine", no_argument, nullptr, 'c' },
|
||||
{ "format", required_argument, nullptr, 'f' },
|
||||
{ "size", required_argument, nullptr, 's' },
|
||||
{ "min-deviation", required_argument, nullptr, 'm' },
|
||||
{ "max-deviation", required_argument, nullptr, 'M' },
|
||||
{ "samples", required_argument, nullptr, 'S' },
|
||||
{ "debug", no_argument, nullptr, 'd' },
|
||||
{ nullptr, 0, nullptr, 0 } // termination of the option list
|
||||
};
|
||||
|
||||
int opt;
|
||||
int optionIndex = 0;
|
||||
|
||||
while ((opt = getopt_long(argc, argv, OPTSTR, OPTIONS, &optionIndex)) >= 0) {
|
||||
std::string const arg(optarg ? optarg : "");
|
||||
switch (opt) {
|
||||
default:
|
||||
case 'h':
|
||||
printUsage(argv[0]);
|
||||
exit(0);
|
||||
case 'L':
|
||||
license();
|
||||
exit(0);
|
||||
case 'f':
|
||||
if (arg == "png") {
|
||||
g_format = ImageEncoder::Format::PNG_LINEAR;
|
||||
} else if (arg == "hdr") {
|
||||
g_format = ImageEncoder::Format::HDR;
|
||||
} else if (arg == "rgbm") {
|
||||
g_format = ImageEncoder::Format::RGBM;
|
||||
} else if (arg == "rgb32f") {
|
||||
g_format = ImageEncoder::Format::RGB_10_11_11_REV;
|
||||
} else if (arg == "exr") {
|
||||
g_format = ImageEncoder::Format::EXR;
|
||||
} else if (arg == "psd") {
|
||||
g_format = ImageEncoder::Format::PSD;
|
||||
} else if (arg == "dds") {
|
||||
g_format = ImageEncoder::Format::DDS_LINEAR;
|
||||
}
|
||||
break;
|
||||
case 'c':
|
||||
builder.cosine(true);
|
||||
break;
|
||||
case 's':
|
||||
builder.lut(stoul(arg));
|
||||
break;
|
||||
case 'm':
|
||||
builder.minDeviation(stof(arg) * f::DEG_TO_RAD);
|
||||
break;
|
||||
case 'M':
|
||||
builder.maxDeviation(stof(arg) * f::DEG_TO_RAD);
|
||||
break;
|
||||
case 'S':
|
||||
builder.samples(stoul(arg));
|
||||
break;
|
||||
case 'd':
|
||||
g_debug = true;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
return optind;
|
||||
}
|
||||
|
||||
int main(int argc, char* argv[]) {
|
||||
using namespace filament::math;
|
||||
using namespace image;
|
||||
|
||||
// process options
|
||||
RainbowGenerator builder;
|
||||
const int optionIndex = handleArguments(argc, argv, builder);
|
||||
const int numArgs = argc - optionIndex;
|
||||
if (numArgs < 1) {
|
||||
printUsage(argv[0]);
|
||||
return 1;
|
||||
}
|
||||
|
||||
utils::Path const path{ argv[optionIndex] };
|
||||
|
||||
// actual computation
|
||||
utils::JobSystem js;
|
||||
js.adopt();
|
||||
Rainbow const rainbow = builder.build(js);
|
||||
|
||||
// save result
|
||||
size_t const angleCount = rainbow.data.size();
|
||||
size_t const height = g_debug ? 32 : 1;
|
||||
|
||||
LinearImage image(angleCount, height, 3);
|
||||
float3* const pData = reinterpret_cast<float3*>(image.getPixelRef());
|
||||
for (size_t index = 0; index < angleCount; index++) {
|
||||
float3 const c = rainbow.data[index];
|
||||
//printf("vec3( %g, %g, %g ),\n", c.r, c.g, c.b);
|
||||
for (int y = 0; y < height; y++) {
|
||||
pData[angleCount * y + index] = c;
|
||||
}
|
||||
}
|
||||
|
||||
// choose a format, either the one specified or from the name, PNG by default
|
||||
ImageEncoder::Format const format =
|
||||
g_format.has_value() ? g_format.value() :
|
||||
ImageEncoder::chooseFormat(path.getPath(), true);
|
||||
|
||||
// if we don't have an extension, pick one from the format
|
||||
std::string filename = path.getPath();
|
||||
if (path.getExtension().empty()) {
|
||||
std::string const ext = ImageEncoder::chooseExtension(format);
|
||||
filename += ext;
|
||||
}
|
||||
|
||||
std::ofstream outputStream(filename, std::ios::binary | std::ios::trunc);
|
||||
ImageEncoder::encode(outputStream, format, image, "", "");
|
||||
}
|
||||
53
tools/rainbowgen/src/srgb.h
Normal file
53
tools/rainbowgen/src/srgb.h
Normal file
@@ -0,0 +1,53 @@
|
||||
/*
|
||||
* Copyright (C) 2024 The Android Open Source Project
|
||||
*
|
||||
* Licensed under the Apache License, Version 2.0 (the "License");
|
||||
* you may not use this file except in compliance with the License.
|
||||
* You may obtain a copy of the License at
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
*/
|
||||
|
||||
#pragma once
|
||||
|
||||
#include <math/mat3.h>
|
||||
#include <math/vec3.h>
|
||||
|
||||
#include <cmath>
|
||||
|
||||
namespace srgb {
|
||||
|
||||
using namespace filament::math;
|
||||
|
||||
inline constexpr float3 XYZ_to_sRGB(float3 const v) noexcept {
|
||||
constexpr mat3f const XYZ_sRGB{
|
||||
3.2404542f, -0.9692660f, 0.0556434f,
|
||||
-1.5371385f, 1.8760108f, -0.2040259f,
|
||||
-0.4985314f, 0.0415560f, 1.0572252f
|
||||
};
|
||||
return XYZ_sRGB * v;
|
||||
}
|
||||
|
||||
inline float3 linear_to_sRGB(float3 c) noexcept {
|
||||
for (auto i = 0; i < c.size(); i++) {
|
||||
c[i] = (c[i] <= 0.0031308f) ?
|
||||
c[i] * 12.92f : (std::pow(c[i], 1.0f / 2.4f) * 1.055f) - 0.055f;
|
||||
}
|
||||
return c;
|
||||
}
|
||||
|
||||
inline float3 sRGB_to_linear(float3 c) noexcept {
|
||||
for (auto i = 0; i < c.size(); i++) {
|
||||
c[i] = (c[i] <= 0.04045f) ?
|
||||
c[i] / 12.92f : std::pow((c[i] + 0.055f) / 1.055f, 2.4f);
|
||||
}
|
||||
return c;
|
||||
}
|
||||
|
||||
} // namespace rainbow
|
||||
Reference in New Issue
Block a user