orthographic_camera.cpp

#include "orthographic_camera.h"

OrthographicCamera::OrthographicCamera( void )
{}

OrthographicCamera::OrthographicCamera( const float min_x,
                                        const float max_x,
                                        const float min_y,
                                        const float max_y,
                                        const glm::ivec2 &resolution,
                                        const glm::vec3 &position,
                                        const glm::vec3 &up_vector,
                                        const glm::vec3 &look_at ) :
        Camera::Camera{ resolution, 
                        position,
                        up_vector,
                        look_at },
        min_x_{ min_x },
        max_x_{ max_x },
        min_y_{ min_y },
        max_y_{ max_y }
{}

Ray OrthographicCamera::getWorldSpaceRay( const glm::vec2 &pixel_coord ) const
{
    float width = max_x_ - min_x_;
    float height = max_y_ - min_y_;

    glm::vec3 origin{ ( pixel_coord[0]+0.5f ) / static_cast< float >( resolution_[0] ) * width + min_x_,
                      ( pixel_coord[1]+0.5f ) / static_cast< float >( resolution_[1] ) * -height + max_y_,
                      0.0f };

    return Ray{ onb_.getBasisMatrix() * origin + position_,
                glm::normalize( onb_.getBasisMatrix() * glm::vec3{ 0.0f, 0.0f, -1.0f } ) };
}