osci-render/Source/audio/PerspectiveEffect.h

#pragma once
#include "EffectApplication.h"
#include "../shape/Point.h"
#include "../audio/Effect.h"
#include "../lua/LuaParser.h"

class PerspectiveEffect : public EffectApplication {
public:
	PerspectiveEffect(int versionHint, std::function<void(int, juce::String, juce::String)> errorCallback);
	~PerspectiveEffect();

	// arbitrary UUID
	static const juce::String FILE_NAME;

	Point apply(int index, Point input, const std::vector<double>& values, double sampleRate) override;
	void updateCode(const juce::String& newCode);
	void setVariable(juce::String variableName, double value);

	juce::String getCode();

	BooleanParameter* fixedRotateX;
	BooleanParameter* fixedRotateY;
	BooleanParameter* fixedRotateZ;

private:
	const juce::String DEFAULT_SCRIPT = "return { x, y, z }";
	juce::String code = DEFAULT_SCRIPT;
	std::function<void(int, juce::String, juce::String)> errorCallback;
	std::unique_ptr<LuaParser> parser = std::make_unique<LuaParser>(FILE_NAME, code, errorCallback);
	juce::SpinLock codeLock;

	bool defaultScript = true;

	float currentRotateX = 0;
	float currentRotateY = 0;
	float currentRotateZ = 0;

	lua_State *L = nullptr;
    
    int versionHint;

	long step = 1;
	double phase = 0;

    double linearSpeedToActualSpeed(double rotateSpeed) {
        double actualSpeed = (std::exp(3 * juce::jmin(10.0, std::abs(rotateSpeed))) - 1) / 50000;
        if (rotateSpeed < 0) {
            actualSpeed *= -1;
        }
        return actualSpeed;
    }
};