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#include "camera.hpp"

using namespace CGLA;

camera::camera(const CGLA::Vec3f& eye, 
                           const CGLA::Vec3f& cnt, 
                           const CGLA::Vec3f& up,
                           float focal)
{
        eye_ = eye;

        z_ = normalize(eye - cnt);
        
        x_ = normalize(cross(up, z_));
        y_ = cross(z_, x_);

        x_ *= 0.012f;
        y_ *= 0.012f;

        focal_ = focal;
}

ray camera::generate(const Vec2f& uv) const
{
        Vec2f xy = 2.f * uv - Vec2f(1.f);

        ray r;
        r.origin = eye_;
        r.direction = normalize(-focal_*z_ + xy[0]*x_ + xy[1]*y_);
        r.depth = 0;
        r.distance = std::numeric_limits<float>::infinity();
        return r;
}

//02566 framework, Anders Wang Kristensen, awk@imm.dtu.dk, 2007