32 lines
1.5 KiB
C++
32 lines
1.5 KiB
C++
#pragma once
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#include "FluidSim/AudioProcessing.hpp"
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#include <algorithm>
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#include <cmath>
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namespace fluidsim::port::desktop {
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// Keep the established absolute vacuum palette. Above atmosphere, use a
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// narrower positive range so modest pulses stand out from the green baseline.
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inline Vec3 pressure_tint(float pressure, bool exhaust=false, float temperature=300.f) {
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if(pressure<=101325) {float t=std::clamp(pressure/101325,0.f,1.f);return {.05f,.15f+.70f*t,1-.95f*t};}
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const float temperature_boost=std::sqrt(std::clamp(temperature/300.f,.25f,9.f));
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const float pulse=(pressure-101325.f)*temperature_boost;
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// Exhaust reaches the warm colors sooner, while using the same continuous
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// ramp so the atmosphere boundary and pulse edges stay smooth.
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const float scale=exhaust?45000.f:150000.f;
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const float t=pulse/(pulse+scale);
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const auto mix=[](Vec3 a,Vec3 b,float u) {
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u=u*u*(3.f-2.f*u);
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return Vec3{a.x+(b.x-a.x)*u,a.y+(b.y-a.y)*u,a.z+(b.z-a.z)*u};
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};
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constexpr Vec3 green{.05f,.85f,.05f},yellow{1.f,1.f,.03f},orange{1.f,.52f,.02f},red{1.f,0.f,0.f};
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if(t<.35f)return mix(green,yellow,t/.35f);
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if(t<.68f)return mix(yellow,orange,(t-.35f)/.33f);
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return mix(orange,red,(t-.68f)/.32f);
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}
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inline float pressure_expansion(float pressure,float temperature=300.f) {
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if(pressure<=101325.f)return 0.f;
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const float temperature_boost=std::sqrt(std::clamp(temperature/300.f,.25f,9.f));
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const float pulse=(pressure-101325.f)*temperature_boost;
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return .10f*pulse/(pulse+80000.f);
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}
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}
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