red cube and jump jo engine

main.c

/*
 *  Cubo 3‑D com pulo correto  –  JoEngine
 *  Controles: D‑Pad move   |   Botão A pula
 */

#include <jo/jo.h>
#include <stdbool.h>

/* ---------- parâmetros ---------- */
#define CUBE_SIZE      32
#define MOVE_SPEED      3
#define GRAVITY         1     /* puxa para baixo ( +Y )            */
#define JUMP_START    -14     /* impulso para cima ( –Y )          */

/* câmera */
#define CAM_DIST     -520
#define CAM_HEIGHT     40
#define FOV_DEGREE     35

/* geometria */
static jo_camera   cam;
static jo_vertice  cube_vertices[]  = JO_3D_CUBE_VERTICES(CUBE_SIZE);
static jo_3d_quad  cube_quads[6];
static jo_vertice  floor_vertices[] = JO_3D_PLANE_VERTICES(256);
static jo_3d_quad  floor_quad;

/* estado */
static int  pos_x = 0, pos_y = 0, pos_z = 0;
static int  vel_y = 0;
static bool jumping = false;

/* ---------- criação ---------- */
static void create_cube(void)
{
    jo_3d_create_cube(cube_quads, cube_vertices);
    for (int i = 0; i < 6; ++i)
        jo_3d_set_color(&cube_quads[i], JO_COLOR_Red);
}
static void create_floor(void)
{
    jo_3d_create_plane(&floor_quad, floor_vertices);
    jo_3d_set_color(&floor_quad, JO_COLOR_Gray);
}

/* ---------- entrada + física ---------- */
static void update_physics(void)
{
    /* mover */
    if (jo_is_pad1_key_pressed(JO_KEY_LEFT))  pos_x -= MOVE_SPEED;
    if (jo_is_pad1_key_pressed(JO_KEY_RIGHT)) pos_x += MOVE_SPEED;
    if (jo_is_pad1_key_pressed(JO_KEY_UP))    pos_z += MOVE_SPEED;
    if (jo_is_pad1_key_pressed(JO_KEY_DOWN))  pos_z -= MOVE_SPEED;

    /* pular */
    if (!jumping && jo_is_pad1_key_pressed(JO_KEY_A))
    {
        jumping = true;
        vel_y   = JUMP_START;      /* valor negativo sobe */
    }

    if (jumping)
    {
        pos_y += vel_y;
        vel_y += GRAVITY;          /* acelera para baixo */
        if (pos_y >= 0)            /* tocou o “chão” */
        {
            pos_y = 0;
            vel_y = 0;
            jumping = false;
        }
    }
}

/* ---------- desenho ---------- */
static void draw_floor(void)
{
    jo_3d_push_matrix();
        jo_3d_rotate_matrix_x(-90);   /* deita o plano */
        jo_3d_draw(&floor_quad);
    jo_3d_pop_matrix();
}
static void draw_cube(void)
{
    jo_3d_push_matrix();
        jo_3d_translate_matrix(pos_x, pos_y, pos_z);
        jo_3d_draw_array(cube_quads, 6);
    jo_3d_pop_matrix();
}

/* ---------- loop ---------- */
static void game_loop(void)
{
    update_physics();

    jo_3d_camera_look_at(&cam);

    draw_floor();
    draw_cube();

    jo_printf(2, 1, "X:%d Y:%d Z:%d   ", pos_x, pos_y, pos_z);
    jo_printf(2, 2, "Poly: %d         ", jo_3d_get_polygon_count());
}

/* ---------- entrada do programa ---------- */
void jo_main(void)
{
    jo_core_init(JO_COLOR_Black);

    jo_3d_perspective_angle(FOV_DEGREE);
    jo_3d_camera_init(&cam);
    jo_3d_camera_set_viewpoint(&cam, 0, CAM_HEIGHT, CAM_DIST);
    jo_3d_camera_set_target(&cam, 0, 0, 0);

    create_cube();
    create_floor();

    jo_core_add_callback(game_loop);
    jo_core_run();
}