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switcher/switcher.c

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#include <sys/keycodes.h>
#include <assert.h>
#include <display.h>
#include <err.h>
#include <errno.h>
#include <pixel.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <timespec.h>
#define STAGES 2
enum game_mode { TITLESCREEN, STAGE };
enum game_mode game_mode = TITLESCREEN;
bool stages_beat[STAGES];
#define PLAYFIELD_SIDE 100
#define TILE_SIDE 10
#define TILES (PLAYFIELD_SIDE / TILE_SIDE)
enum palette {
BG = 0,
TEXT,
PLAYER_OUTLINE,
PLAYER_SKIN,
PLAYER_EYE,
GRASS_TOP,
GRASS_BROWN,
GRASS_DARK,
FLAG_STEM,
FLAG_FLAG,
SWITCH_SWITCH,
SWITCH1_HIGHLIGHT,
TILE1,
STAR_STAR,
ERROR,
};
static enum palette playfield[PLAYFIELD_SIDE * PLAYFIELD_SIDE];
#include "player_stand_tile.inc"
#include "player_walk1_tile.inc"
#include "player_walk2_tile.inc"
#include "player_walk1_tile_reversed.inc"
#include "player_walk2_tile_reversed.inc"
#include "grass_tile.inc"
#include "dirt_tile.inc"
#include "flag_tile.inc"
#include "switch1_off_tile.inc"
#include "switch1_on_tile.inc"
#include "tile1_off_tile.inc"
#include "tile1_on_tile.inc"
#include "stage1_tile.inc"
#include "stage2_tile.inc"
#include "star_tile.inc"
static char tilemap[TILES * TILES + 1];
static char *stages[] = {
" "
" "
" "
"! g "
"gg g "
" g"
" g "
" g "
"@ gdg "
"gg dddgg ",
" "
" "
" "
" "
" "
" "
" A "
" 11g "
"@ !"
"ggg gg"
};
enum switches_state { ALL_OFF, SWITCH1 };
enum switches_state switches_state;
static uint32_t main_window = 0;
static uint32_t window_width = 500;
static uint32_t window_height = 500;
static bool game_running = true;
static void on_disconnect(void *context) {
(void) context;
game_running = false;
}
static bool left_held, right_held, jump_held;
static double jump_maxheight = 21;
static double jump_duration = 0.4;
static void on_keyboard(void *context, uint32_t window, uint32_t codepoint) {
(void) context;
if (window != main_window)
return;
int key = KBKEY_DECODE(codepoint);
switch (key) {
// TODO: rebinding
case KBKEY_LEFT: left_held = true; break;
case -KBKEY_LEFT: left_held = false; break;
case KBKEY_RIGHT: right_held = true; break;
case -KBKEY_RIGHT: right_held = false; break;
case KBKEY_SPACE: jump_held = true; break;
case -KBKEY_SPACE: jump_held = false; break;
}
}
static void on_quit(void *context, uint32_t window) {
(void) context;
if (window != main_window)
return;
game_running = false;
}
static void on_resize(void *context, uint32_t window, uint32_t width, uint32_t height) {
(void) context;
if (window != main_window)
return;
window_width = width;
window_height = height;
}
static double timespec2double(struct timespec ts) {
return ts.tv_sec + ts.tv_nsec / 1000.0 / 1000.0 / 1000.0;
}
static char sample_tilemap(size_t x, size_t y) {
size_t tx = x / TILE_SIDE;
size_t ty = y / TILE_SIDE;
if (tx >= TILES || ty >= TILES) return ' ';
return tilemap[ty * TILES + tx];
}
static bool solid_tile(size_t x, size_t y) {
char tile = sample_tilemap(x, y);
return tile != ' ' && tile != '!' && tile != '@' && tile != 'A' &&
(tile != '1' || switches_state == SWITCH1);
}
static bool jumping = false;
static bool on_ground = false;
static double jump_start_y;
static double in_jump;
static double player_x, player_y;
static double player_dx, player_dy;
static size_t selection_index = 0;
static void initialize_stage(void) {
strcpy(tilemap, stages[selection_index]);
switches_state = ALL_OFF;
jumping = false;
on_ground = false;
player_dx = 0;
player_x = 0;
player_y = 0;
for (size_t ty = 0; ty < TILES; ty++) {
for (size_t tx = 0; tx < TILES; tx++) {
if (tilemap[ty * TILES + tx] == '@') {
player_x = tx * TILE_SIDE;
player_y = ty * TILE_SIDE;
}
}
}
}
static bool keys_released;
static bool stage_selected;
static void initialize_titlescreen(void) {
keys_released = false; stage_selected = false;
}
static void initialize(void) {
switch (game_mode) {
case TITLESCREEN: initialize_titlescreen(); break;
case STAGE: initialize_stage(); break;
default: printf("%i\n", game_mode); break;
}
}
static void update_stage(struct timespec now, struct timespec dt_timespec) {
(void) now;
double dt = timespec2double(dt_timespec);
player_x += player_dx * dt;
if (left_held) player_dx = -30;
else if (right_held) player_dx = 30;
else player_dx = 0;
if (on_ground && jump_held && !jumping) {
jumping = true;
in_jump = 0;
jump_start_y = player_y;
}
if (!on_ground && !jumping) {
jumping = true;
in_jump = jump_duration;
jump_start_y = player_y + jump_maxheight;
}
if (jumping) {
in_jump += dt;
// Jump is a quadratic arc
// h = at^2 + bt + c
//
// Beginning of jump, zero height
// t = 0, h = 0
// 0 = a0^2 + b0 + c
// c = 0
//
// At 2*duration, zero height
// t = 2T, h = 0
// 0 = a(2T)^2 + b(2T) + 0
// 0 = 4aT^2 + 2bT
// 0 = 2aT^2 + bT
// 0 = 2aT + b
// b = -2aT
//
// At duration, maximum height
// t = T, h = H
// H = aT^2 + bT + 0
// H = aT^2 - 2aT^2
// H = -aT^2
// a = -H / (T^2)
// b
double a = -jump_maxheight / (jump_duration * jump_duration);
double b = -2 * a * jump_duration;
double jump_height = a * in_jump * in_jump + b * in_jump;
player_y = jump_start_y - jump_height;
// player_dy is negative of derivative of jump_height
// H = a*t^2 + b*t
// H' = 2*a*t + b
player_dy = -2 * a * in_jump - b;
}
// Collision against walls of the map
if (player_x < 0) {
player_x = 0;
player_dx = 0;
} else if (player_x > PLAYFIELD_SIDE - TILE_SIDE) {
player_x = PLAYFIELD_SIDE - TILE_SIDE;
player_dx = 0;
}
if (player_y < 0) {
player_y = 0;
player_dy = 0;
} else if (player_y > PLAYFIELD_SIDE - TILE_SIDE) {
player_y = PLAYFIELD_SIDE - TILE_SIDE;
player_dy = 0;
game_mode = TITLESCREEN;
initialize();
return;
}
// Collision against tiles
size_t px = player_x;
size_t py = player_y;
size_t left_cx = px - 1;
size_t right_cx = px + TILE_SIDE;
size_t leftright_top_cy = py;
size_t leftright_bottom_cy = py + TILE_SIDE - 3; //XXX: proper handling of snapping
if ((solid_tile(left_cx, leftright_top_cy) ||
solid_tile(left_cx, leftright_bottom_cy)) &&
player_dx < 0) {
size_t snapped_px = (px + TILE_SIDE - 1) / TILE_SIDE * TILE_SIDE;
player_x = snapped_px;
player_dx = 0;
}
if ((solid_tile(right_cx, leftright_top_cy) ||
solid_tile(right_cx, leftright_bottom_cy)) &&
player_dx > 0) {
size_t snapped_px = px / TILE_SIDE * TILE_SIDE;
player_x = snapped_px;
player_dx = 0;
}
px = player_x;
py = player_y;
size_t topbottom_left_cx = px;
size_t topbottom_right_cx = px + TILE_SIDE - 1;
size_t top_cy = py - 1;
size_t bottom_cy = py + TILE_SIDE;
on_ground = false;
if (solid_tile(topbottom_left_cx, bottom_cy) ||
solid_tile(topbottom_right_cx, bottom_cy)) {
on_ground = true;
if (player_dy > 0) {
jumping = false;
size_t snapped_py = py / TILE_SIDE * TILE_SIDE;
player_y = snapped_py;
}
}
if ((solid_tile(topbottom_left_cx, top_cy) ||
solid_tile(topbottom_right_cx, top_cy)) &&
player_dy < 0) {
size_t snapped_py = (py + TILE_SIDE - 1) / TILE_SIDE * TILE_SIDE;
player_y = snapped_py;
in_jump = jump_duration;
jump_start_y = player_y + jump_maxheight;
}
// Touching tiles
size_t midpoint_x = player_x + TILE_SIDE / 2;
size_t midpoint_y = player_y + TILE_SIDE / 2;
switch(sample_tilemap(midpoint_x, midpoint_y)) {
case '!':
stages_beat[selection_index] = true;
if (selection_index < STAGES - 1)
selection_index++;
game_mode = TITLESCREEN;
initialize();
return;
case 'A':
switches_state = SWITCH1;
break;
}
}
static void update_titlescreen(struct timespec now, struct timespec dt_timespec) {
(void) now;
(void) dt_timespec;
if (keys_released && left_held && selection_index > 0)
selection_index--;
if (keys_released && right_held && selection_index < STAGES - 1)
selection_index++;
if (keys_released && jump_held)
stage_selected = true;
if (!left_held && !right_held && !jump_held)
keys_released = true;
else
keys_released = false;
if (stage_selected && keys_released) {
game_mode = STAGE;
initialize();
}
}
static void update(struct timespec now, struct timespec dt_timespec) {
switch (game_mode) {
case TITLESCREEN: update_titlescreen(now, dt_timespec); break;
case STAGE: update_stage(now, dt_timespec); break;
default: printf("%i\n", game_mode); break;
}
}
static void draw_tile(enum palette tile[], size_t x, size_t y) {
assert(x + TILE_SIDE <= PLAYFIELD_SIDE);
assert(y + TILE_SIDE <= PLAYFIELD_SIDE);
for (size_t ty = 0; ty < TILE_SIDE; ty++) {
for (size_t tx = 0; tx < TILE_SIDE; tx++) {
enum palette pixel = tile[ty * TILE_SIDE + tx];
playfield[(y + ty) * PLAYFIELD_SIDE + x + tx] = pixel;
}
}
}
static void draw_tiles(void) {
assert(strlen(tilemap) == TILES * TILES);
for (size_t ty = 0; ty < TILES; ty++) {
for (size_t tx = 0; tx < TILES; tx++) {
enum palette *tile = NULL;
switch(tilemap[ty * TILES + tx]) {
case 'g': tile = grass_tile; break;
case 'd': tile = dirt_tile; break;
case '!': tile = flag_tile; break;
case 'A': tile = switches_state == SWITCH1 ? switch1_on_tile : switch1_off_tile; break;
case '1': tile = switches_state == SWITCH1 ? tile1_on_tile : tile1_off_tile; break;
}
if (tile)
draw_tile(tile, tx * TILE_SIDE, ty * TILE_SIDE);
}
}
}
static void draw_stage(struct timespec now) {
memset(playfield, 0, sizeof(playfield));
draw_tiles();
if (player_dx > 0 && now.tv_nsec % 500000000L < 250000000L)
draw_tile(player_walk1_tile, player_x, player_y);
else if (player_dx > 0)
draw_tile(player_walk2_tile, player_x, player_y);
else if (player_dx < 0 && now.tv_nsec % 500000000L < 250000000L)
draw_tile(player_walk1_tile_reversed, player_x, player_y);
else if (player_dx < 0)
draw_tile(player_walk2_tile_reversed, player_x, player_y);
else
draw_tile(player_stand_tile, player_x, player_y);
}
static void draw_titlescreen(struct timespec now) {
(void) now;
memset(playfield, 0, sizeof(playfield));
for (size_t i = 0; i < STAGES; i++) {
size_t x = i * TILE_SIDE + TILE_SIDE;
size_t y = 0;
if (stages_beat[i])
draw_tile(star_tile, x, y);
}
draw_tile(stage1_tile, 1 * TILE_SIDE, TILE_SIDE);
draw_tile(stage2_tile, 2 * TILE_SIDE, TILE_SIDE);
size_t underline_y = 2 * TILE_SIDE + 1;
size_t underline_x = selection_index * TILE_SIDE + TILE_SIDE + 2;
for (size_t x = 0; x < TILE_SIDE - 4; x++)
playfield[underline_y * PLAYFIELD_SIDE + underline_x + x] = TEXT;
}
static void draw(struct timespec now) {
switch (game_mode) {
case TITLESCREEN: draw_titlescreen(now); break;
case STAGE: draw_stage(now); break;
default: printf("%i\n", game_mode); break;
}
}
int main(int argc, char *argv[]) {
struct display_connection *connection = display_connect_default();
if (!connection && errno == ECONNREFUSED)
display_spawn(argc, argv);
if (!connection)
err(1, "Could not connect to display server");
display_create_window(connection, main_window);
display_resize_window(connection, main_window, window_width, window_height);
display_show_window(connection, main_window);
struct display_event_handlers handlers = {0};
handlers.disconnect_handler = on_disconnect;
handlers.keyboard_handler = on_keyboard;
handlers.quit_handler = on_quit;
handlers.resize_handler = on_resize;
uint32_t palette_colours[] = {
[BG] = make_color(128, 128, 255),
[TEXT] = make_color(255, 255, 255),
[PLAYER_OUTLINE] = make_color(0, 0, 0),
[PLAYER_SKIN] = make_color(180, 100, 64),
[PLAYER_EYE] = make_color(255, 255, 255),
[GRASS_TOP] = make_color(0, 220, 0),
[GRASS_BROWN] = make_color(200, 128, 0),
[GRASS_DARK] = make_color(100, 64, 0),
[FLAG_STEM] = make_color(0, 0, 0),
[FLAG_FLAG] = make_color(255, 0, 0),
[SWITCH_SWITCH] = make_color(200, 64, 0),
[SWITCH1_HIGHLIGHT] = make_color(0, 255, 0),
[TILE1] = make_color(0, 255, 0),
[STAR_STAR] = make_color(255, 255, 0),
[ERROR] = make_color(255, 0, 255),
};
long fps_cap = 100;
struct timespec min_dt = timespec_make(0, 1000L * 1000L * 1000L / fps_cap);
struct timespec last_frame;
clock_gettime(CLOCK_MONOTONIC, &last_frame);
initialize();
int fps = 0;
while (game_running) {
struct timespec now;
clock_gettime(CLOCK_MONOTONIC, &now);
struct timespec dt = timespec_sub(now, last_frame);
if (timespec_lt(dt, min_dt)) {
struct timespec sleep = timespec_sub(min_dt, dt);
nanosleep(&sleep, NULL);
continue;
}
if (last_frame.tv_sec != now.tv_sec) {
char *title = NULL;
asprintf(&title, "Switcher (%i fps)", fps);
display_title_window(connection, main_window, title);
free(title);
fps = 0;
} else
fps++;
update(now, dt);
draw(now);
size_t pixels;
if (__builtin_mul_overflow(window_width, window_height, &pixels))
errx(1, "Window size too big");
uint32_t *framebuffer = calloc(pixels, sizeof(uint32_t));
uint32_t shorter_side = window_height < window_width ? window_height : window_width;
size_t y_offset = (window_height - shorter_side) / 2;
size_t x_offset = (window_width - shorter_side) / 2;
for (size_t y = 0; y < window_height; y++) {
for (size_t x = 0; x < window_width; x++) {
if (y < y_offset || x < x_offset ||
y >= y_offset + shorter_side || x >= x_offset + shorter_side)
framebuffer[y * window_width + x] = make_color_a(0, 0, 0, 200);
else {
size_t pf_x = (x - x_offset) * PLAYFIELD_SIDE / shorter_side;
size_t pf_y = (y - y_offset) * PLAYFIELD_SIDE / shorter_side;
uint32_t colour = palette_colours[playfield[pf_y * PLAYFIELD_SIDE + pf_x]];
framebuffer[y * window_width + x] = colour;
}
}
}
display_render_window(connection, main_window, 0, 0, window_width, window_height, framebuffer);
free(framebuffer);
while (!display_poll_event(connection, &handlers));
last_frame = now;
}
display_disconnect(connection);
return 0;
}
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