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/*
* Copyright (C) 2018 Tomasz Kramkowski <tk@the-tk.com>
* SPDX-License-Identifier: MIT
*/
#include <assert.h>
#include <math.h>
#include <stdlib.h>
#include "camera.h"
#include "math.h"
#define PITCH_LIMIT (PI * 0.99)
// camera_clamp: clamp camera pitch and normalize yaw
void camera_clamp(struct camera *cam)
{
assert(cam != NULL);
cam->yaw = fmod(cam->yaw, 2 * PI);
if (cam->pitch > PITCH_LIMIT / 2)
cam->pitch = PITCH_LIMIT / 2;
else if (cam->pitch < -PITCH_LIMIT / 2)
cam->pitch = -PITCH_LIMIT / 2;
}
// camera_dir: get the camera facing vector
void camera_dir(vec3 out, struct camera *cam)
{
assert(out != NULL);
assert(cam != NULL);
out[0] = cosf(cam->pitch) * cosf(cam->yaw);
out[1] = sinf(cam->pitch);
out[2] = cosf(cam->pitch) * sinf(cam->yaw);
}
// camera_lookat: get the camera view matrix
void camera_lookat(mat4x4 out, struct camera *cam)
{
vec3 at, dir;
assert(out != NULL);
assert(cam != NULL);
camera_dir(dir, cam);
vec3_add(at, cam->pos, dir);
mat4x4_look_at(out, cam->pos, at, (vec3){ 0, 1, 0 });
}
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