interference/src/player.c

#include "player.h"
#include "conf.h"
#include "draw.h"
#include "input.h"
#include "level.h"
#include "tools.h"

static int k_up, k_down, k_left, k_right, k_jump, k_jumpdown;
static struct Player player;
static void player_get_input(void);
static void player_move(struct Vec2 spd);
static struct Vec2 player_update_rem();
static int player_collide_pixel(int x, int y, tile_t id);
static int player_collide(struct Vec2 pos, tile_t id, int h);

void
player_init(void)
{
	player.pos = (struct Vec2){160, 100};
	player.spd = (struct FVec2){0.0f, 0.0f};
	player.rem = (struct FVec2){0.0f, 0.0f};
	player.jumping = 1;
	player.airbreak = 1;
}

void
player_update(void)
{
	player_get_input();
	const int dir = k_right - k_left;

	if (player.jumping && (!k_jumpdown || player.spd.y > 0)) {
		player.airbreak = 1;
	}

	if (k_jump && !player.jumping) {
		player.spd.y = -PLAYER_JUMP;
		player.jumping = 1;
		player.airbreak = 0;
	}

	player.spd.x *= (1 - PLAYER_FRIC);
	player.spd.x += dir * PLAYER_ACC;
	player.spd.y += GRAVITY + GRAVITY * player.airbreak;

	player_move(player_update_rem());

	if (player_collide((struct Vec2){player.pos.x, player.pos.y + 1}, 1,
	                   0)) {
		player.jumping = 0;
	}
}

void
player_draw(void)
{
	draw_rectangle(player.pos.x, player.pos.y, PLAYER_S, PLAYER_S, C_BLACK);
	dprint(10, 10, C_BLACK, "%d", player_collide(player.pos, 1, 0));
}

static void
player_get_input(void)
{
	k_up = input_down(K_UP);
	k_down = input_down(K_DOWN);
	k_left = input_down(K_LEFT);
	k_right = input_down(K_RIGHT);
	k_jump = input_pressed(K_A);
	k_jumpdown = input_down(K_A);
}

static struct Vec2
player_update_rem(void)
{
	struct FVec2 spdrem = (struct FVec2){player.spd.x + player.rem.x,
	                                     player.spd.y + player.rem.y};
	struct Vec2 ispd = (struct Vec2){spdrem.x, spdrem.y};

	player.rem.x = spdrem.x - (float)ispd.x;
	player.rem.y = spdrem.y - (float)ispd.y;
	return ispd;
}

static void
player_move(struct Vec2 spd)
{
	if (player_collide(player.pos, 1, 0)) {
		return;
	}

	player_update_rem();

	if (spd.x) {
		const int sign_x = sign(spd.x);
		player.pos.x += spd.x;
		if (player_collide(player.pos, 1, 0)) {
			player.spd.x = 0.0f;
			player.rem.x = 0.0f;
			while (player_collide(player.pos, 1, 0)) {
				player.pos.x -= sign_x;
			}
		}
	}

	if (spd.y) {
		const int sign_y = sign(spd.y);
		player.pos.y += spd.y;
		if (player_collide(player.pos, 1, 0)) {
			player.spd.y = 0.0f;
			player.rem.y = 0.0f;
			while (player_collide(player.pos, 1, 0)) {
				player.pos.y -= sign_y;
			}
		}
	}
}

static int
player_collide_pixel(int x, int y, tile_t id)
{
	const tile_t tile = level_get_px(x, y);

	if (!tile) {
		return 0;
	}

	if (id == 1) {
		return (tile - 1) % TILESET_W < 8;
	}

	return tile == id;
}

static int
player_collide(struct Vec2 pos, tile_t id, int h)
{

	const struct Vec2 pos_tl = (struct Vec2){pos.x + h, pos.y + h};
	const struct Vec2 pos_br =
	    (struct Vec2){pos.x + PLAYER_S - h - 1, pos.y + PLAYER_S - h - 1};
	const struct Vec2 middle =
	    (struct Vec2){pos.x + PLAYER_S / 2, pos.y + PLAYER_S / 2};

	if (player_collide_pixel(pos_tl.x, pos_tl.y, id) ||
	    player_collide_pixel(pos_br.x, pos_br.y, id) ||
	    player_collide_pixel(pos_tl.x, pos_br.y, id) ||
	    player_collide_pixel(pos_br.x, pos_tl.y, id) ||
	    player_collide_pixel(middle.x, pos_tl.y, id) ||
	    player_collide_pixel(middle.x, pos_br.y, id) ||
	    player_collide_pixel(pos_tl.x, middle.y, id) ||
	    player_collide_pixel(pos_br.x, middle.y, id)) {
		return 1;
	}
	return 0;
}