townengine/apps/demos/scenery/scenes/ingame.c

#include "ingame.h"
#include "title.h"
#include "scene.h"

#include "twn_game_api.h"
#include "twn_vec.h"

#define STB_PERLIN_IMPLEMENTATION
#include <stb_perlin.h>
#include <SDL2/SDL.h>

#include <stdlib.h>


static void ingame_tick(State *state) {
    SceneIngame *scn = (SceneIngame *)state->scene;

    input_action("player_left", CONTROL_A);
    input_action("player_right", CONTROL_D);
    input_action("player_forward", CONTROL_W);
    input_action("player_backward", CONTROL_S);
    input_action("player_jump", CONTROL_SPACE);
    input_action("player_run", CONTROL_LSHIFT);
    input_action("mouse_capture_toggle", CONTROL_ESCAPE);

    if (scn->mouse_captured) {
        const float sensitivity = 0.4f * (float)DEG2RAD; /* TODO: put this in a better place */
        scn->yaw += (float)ctx.mouse_movement.x * sensitivity;
        scn->pitch -= (float)ctx.mouse_movement.y * sensitivity;
        scn->pitch = clampf(scn->pitch, (float)-M_PI * 0.49f, (float)M_PI * 0.49f);
    }

    DrawCameraFromPrincipalAxesResult dir_and_up =
        draw_camera_from_principal_axes(scn->pos, (float)M_PI_2, scn->roll, scn->pitch, scn->yaw);

    const Vec3 right = m_vec_norm(m_vec_cross(dir_and_up.direction, dir_and_up.up));
    const float speed = 0.04f; /* TODO: put this in a better place */
    if (input_action_pressed("player_left"))
        scn->pos = vec3_sub(scn->pos, m_vec_scale(right, speed));

    if (input_action_pressed("player_right"))
        scn->pos = vec3_add(scn->pos, m_vec_scale(right, speed));

    if (input_action_pressed("player_forward"))
        scn->pos = vec3_add(scn->pos, m_vec_scale(dir_and_up.direction, speed));

    if (input_action_pressed("player_backward"))
        scn->pos = vec3_sub(scn->pos, m_vec_scale(dir_and_up.direction, speed));

    if (input_action_pressed("player_jump"))
        scn->pos.y += speed;

    if (input_action_pressed("player_run"))
        scn->pos.y -= speed;

    /* toggle mouse capture with end key */
    if (input_action_just_pressed("mouse_capture_toggle"))
        scn->mouse_captured = !scn->mouse_captured;

    input_mouse_captured(scn->mouse_captured);

    #define TERRAIN_FREQUENCY 0.1f

    for (int ly = 128; ly--;) {
        for (int lx = 128; lx--;) {
            float x = SDL_truncf(scn->pos.x + 64 - (float)lx);
            float y = SDL_truncf(scn->pos.z + 64 - (float)ly);

            float d0 = stb_perlin_noise3((float)x       * TERRAIN_FREQUENCY, (float)y       * TERRAIN_FREQUENCY, 0, 0, 0, 0) * 3 - 6;
            float d1 = stb_perlin_noise3((float)(x + 1) * TERRAIN_FREQUENCY, (float)y       * TERRAIN_FREQUENCY, 0, 0, 0, 0) * 3 - 6;
            float d2 = stb_perlin_noise3((float)(x + 1) * TERRAIN_FREQUENCY, (float)(y - 1) * TERRAIN_FREQUENCY, 0, 0, 0, 0) * 3 - 6;
            float d3 = stb_perlin_noise3((float)x       * TERRAIN_FREQUENCY, (float)(y - 1) * TERRAIN_FREQUENCY, 0, 0, 0, 0) * 3 - 6;

            draw_triangle("/assets/grass.png",
                            (Vec3){ (float)x,     d0, (float)y },
                            (Vec3){ (float)x + 1, d1, (float)y },
                            (Vec3){ (float)x,     d3, (float)y - 1 },
                            (Vec2){ 128, 128 },
                            (Vec2){ 128, 0 },
                            (Vec2){ 0, 128 });

            draw_triangle("/assets/grass.png",
                            (Vec3){ (float)x + 1, d1, (float)y },
                            (Vec3){ (float)x + 1, d2, (float)y - 1 },
                            (Vec3){ (float)x,     d3, (float)y - 1 },
                            (Vec2){ 128, 0 },
                            (Vec2){ 0, 0 },
                            (Vec2){ 0, 128 });
        }
    }

    draw_skybox("/assets/miramar/miramar_*.tga");
    draw_fog(0.9f, 1.0f, 0.05f, (Color){ 140, 147, 160, 255 });
}


static void ingame_end(State *state) {
    free(state->scene);
}


Scene *ingame_scene(State *state) {
    (void)state;

    SceneIngame *new_scene = ccalloc(1, sizeof *new_scene);
    new_scene->base.tick = ingame_tick;
    new_scene->base.end = ingame_end;

    new_scene->mouse_captured = true;

    m_audio(m_set(path, "music/mod65.xm"),
            m_opt(channel, "soundtrack"),
            m_opt(repeat, true));

    return (Scene *)new_scene;
}