25 lines
1.1 KiB
C++
25 lines
1.1 KiB
C++
#include "light/light.h"
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#include "scene/scene.h"
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#include "shader/phongshader.h"
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PhongShader::PhongShader(Color const &diffuseColor, float diffuseCoefficient, Color const &specularColor,
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float specularCoefficient, float shininessExponent)
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: diffuseColor(diffuseColor), diffuseCoefficient(diffuseCoefficient), specularColor(specularColor),
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specularCoefficient(specularCoefficient), shininessExponent(shininessExponent) {}
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Color PhongShader::shade(Scene const &scene, Ray const &ray) const {
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Color fragmentColor;
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for (auto &light: scene.lights()) {
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auto illum = light->illuminate(scene, ray);
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Vector3d reflection = illum.direction - 2 * dotProduct(illum.direction, ray.normal) * ray.normal;
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Color diffuse = diffuseCoefficient * dotProduct(illum.direction, -ray.normal) * diffuseColor;
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Color specular = specularCoefficient * specularColor
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* std::pow(dotProduct(ray.direction, -reflection), shininessExponent);
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fragmentColor += illum.color * diffuse + illum.color * specular;
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}
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return fragmentColor;
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}
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