C++ coding exercise about Lighting Equations (GLM)

/**************************************************** * 2016-2020 Eric Bachmann and Mike Zmuda * All Rights Reserved. * NOTICE: * Dissemination of this information or reproduction * of this material is prohibited unless prior written * permission is granted.. ****************************************************/ #pragma once #include <iostream> #include <vector> #include "Defs.h" #include "HitRecord.h" /** * @struct LightATParams * @brief A light attenuation parameters. */ struct LightATParams { double constant, linear, quadratic; //!< Parameters controlling attenuation. LightATParams(double C, double L, double Q) { constant = C; linear = L; quadratic = Q; } double factor(double distance) const { return 1.0 / (constant + linear * distance + quadratic * distance * distance); } friend ostream &operator << (ostream &os, const LightATParams &at); }; /** * @struct LightColor * @brief Represents the colors of each light component. */ struct LightColor { color ambient, diffuse, specular; //!< The three light components. LightColor(const color &amb, const color &dif, const color &spec) : ambient(amb), diffuse(dif), specular(spec) { } LightColor(const color &oneColor) : ambient(oneColor), diffuse(oneColor), specular(oneColor) { } LightColor(const vector<double> &C) : LightColor(color(C[0], C[1], C[2]), color(C[3], C[4], C[5]), color(C[6], C[7], C[8])) { } }; /** * @struct LightSource * @brief A generic light source. */ struct LightSource { bool isOn; //!< True if the light is active; otherwise, has no effect. LightSource() { isOn = true; } virtual color illuminate(const dvec3 &interceptWorldCoords, const dvec3 &normal, const Material &material, const Frame &eyeFrame, bool inShadow) const = 0; }; /** * @struct PositionalLight * @brief Represents a simple positional light source. */ struct PositionalLight : public LightSource { dvec3 pos; //!< The position of the light. bool attenuationIsTurnedOn; //!< true if attenuation is active. bool isTiedToWorld; //!< true if the position is in world (or eye) coordinates. LightATParams atParams; LightColor lightColor; PositionalLight(const dvec3 &position, const LightColor &color) : LightSource(), lightColor(color), pos(position), atParams(1.0, 0.0, 0.0) { attenuationIsTurnedOn = false; isTiedToWorld = true; } void setAttenuation(bool isOn) { attenuationIsTurnedOn = isOn; } void setAttenuationParams(const LightATParams &params) { atParams = params; } virtual color illuminate(const dvec3 &interceptWorldCoords, const dvec3 &normal, const Material &material, const Frame &eyeFrame, bool inShadow) const; friend ostream &operator << (ostream &os, const PositionalLight &pl); }; /** * @struct SpotLight * @brief A spot light. */ struct SpotLight : public PositionalLight { double fov; //!< Field of view of the light. dvec3 spotDir; //!< Direction of spotlight. SpotLight(const dvec3 &position, const dvec3 &dir, double angleInRadians, const LightColor &lightColor) : PositionalLight(position, lightColor), spotDir(dir), fov(angleInRadians) { } virtual color illuminate(const dvec3 &interceptWorldCoords, const dvec3 &normal, const Material &material, const Frame &eyeFrame, bool inShadow) const; friend ostream &operator << (ostream &os, const SpotLight &pl); }; const LightColor pureWhiteLight(vector<double>{1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0}); color ambientColor(const color &matAmbient, const color &lightAmbient); color diffuseColor(const color &matDiffuse, const color &lightDiffuse, const dvec3 &l, const dvec3 &n); color specularColor(const color &mat, const color &light, double shininess, const dvec3 &r, const dvec3 &v); color totalColor(const Material &mat, const LightColor &lightColor, const dvec3 &v, const dvec3 &n, const dvec3 &lightPos, const dvec3 &intersectionPt, bool attenuationOn, const LightATParams &ATparams); typedef LightSource *LightSourcePtr; typedef PositionalLight *PositionalLightPtr; typedef SpotLight *SpotLightPtr; ostream &operator << (ostream &os, const LightColor &light);