camera.h

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#pragma once
 
#include "eu/render/space.h"
 
namespace eu::render
{

 
// todo(Gustav): rename to PerspectiveCamera? or PerspCamera?
struct Camera
{
    An fov = 45.0_deg;
    float near = 0.1f;
    float far = 100.0f;
 
    v3 position = v3{0.0f, 0.0f, 0.0f};
 
    Ypr rotation = Ypr
    {
        .yaw = 0.0_rad,
        .pitch = 0.0_rad,
        .roll = 0.0_rad
    };
};

struct OrthoCamera
{
    float size = 100.0f;
 
    float near = 0.1f;
    float far = 100.0f;
 
    v3 position = v3{0.0f, 0.0f, 0.0f};
 
    Ypr rotation = Ypr
    {
        .yaw = 0.0_rad,
        .pitch = 0.0_rad,
        .roll = 0.0_rad
    };
};

struct CompiledCamera
{
    m4 clip_from_view;

    m4 view_from_world;
    v3 position;
    n3 in;
};

// Functions

CameraVectors create_vectors(const Camera& camera);
 
// todo(Gustav): the meaning of this function is unclear... move closer to usage or remove?
m4 create_view_from_world_mat(const v3& pos, const CameraVectors& cv);

CompiledCamera compile(const Camera&, const Size& window_size);

CompiledCamera compile(const OrthoCamera&, const Size& window_size);
 
// todo(Gustav): also include depth, what happens if the position is behind?
v2 screen_from_world(const CompiledCamera& cam, const v3& world_pos, const v2& resolution);

}  //  namespace eu::render