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2022-01-13

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NAME = platformer
all: $(NAME)
$(NAME): $(NAME).c
$(CC) -O3 -Wall -Wextra -Werror -pedantic -o $@ $< -ldisplay
run: $(NAME)
./$(NAME)
clean:
rm -f $(NAME)
distclean: clean
.PHONY: all clean

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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 PLAYFIELD_SIDE 100
#define TILE_SIDE 10
#define TILES (PLAYFIELD_SIDE / TILE_SIDE)
enum palette {
BG = 0,
TEXT,
GRASS_TOP,
GRASS_BROWN,
ERROR,
};
static enum palette playfield[PLAYFIELD_SIDE * PLAYFIELD_SIDE];
static char tilemap[] = " "
" "
" "
" "
"gg "
" "
" "
" g "
" g g "
"gggggggggg";
static uint32_t main_window = 0;
static uint32_t window_width = 600;
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 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;
}
char sample_tilemap(double x, double y) {
size_t tx = x / TILE_SIDE;
size_t ty = y / TILE_SIDE;
assert(tx < TILES);
assert(ty < TILES);
return tilemap[ty * TILES + tx];
}
static double player_x, player_y;
static double player_dx, player_dy;
static void update(struct timespec now, struct timespec dt_timespec) {
(void) now;
double dt = timespec2double(dt_timespec);
player_x += player_dx * dt;
player_y += player_dy * dt;
if (left_held) player_dx = -30;
else if (right_held) player_dx = 30;
else player_dx = 0;
// 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;
}
// Collision against tiles
char topleft = sample_tilemap(player_x, player_y);
char topright = sample_tilemap(player_x + TILE_SIDE, player_y);
char bottomleft = sample_tilemap(player_x, player_y + TILE_SIDE);
char bottomright = sample_tilemap(player_x + TILE_SIDE, player_y + TILE_SIDE);
bool on_ground = false;
if (bottomleft != ' ' || bottomright != ' ')
on_ground = true;
if (topleft != ' ' || topright != ' ' || bottomleft != ' ' || bottomright != ' ')
player_dx = 0;
if (on_ground)
player_dy = 0;
else
player_dy = 30;
}
static void draw_grass_tile(size_t x, size_t y) {
assert(x + TILE_SIDE <= PLAYFIELD_SIDE);
assert(y + TILE_SIDE <= PLAYFIELD_SIDE);
char grass_tile[] = "xxxxxxxxxx"
"xx xx x x "
" x x x "
" "
" "
" "
" "
" "
" "
" ";
assert(strlen(grass_tile) == TILE_SIDE * TILE_SIDE);
for (size_t ty = 0; ty < TILE_SIDE; ty++) {
for (size_t tx = 0; tx < TILE_SIDE; tx++) {
enum palette pixel;
switch (grass_tile[ty * TILE_SIDE + tx]) {
case 'x': pixel = GRASS_TOP; break;
case ' ': pixel = GRASS_BROWN; break;
default: pixel = ERROR; break;
}
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++) {
switch(tilemap[ty * TILES + tx]) {
case 'g': draw_grass_tile(tx * TILE_SIDE, ty * TILE_SIDE); break;
}
}
}
}
static void draw(void) {
memset(playfield, 0, sizeof(playfield));
draw_tiles();
draw_grass_tile(player_x, player_y);
}
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),
[GRASS_TOP] = make_color(0, 255, 0),
[GRASS_BROWN] = make_color(200, 128, 0),
[ERROR] = make_color(255, 0, 255),
};
long fps_cap = 60;
struct timespec min_dt = timespec_make(0, 1000L * 1000L * 1000L / fps_cap);
struct timespec last_frame;
clock_gettime(CLOCK_MONOTONIC, &last_frame);
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, "%i fps", fps);
display_title_window(connection, main_window, title);
free(title);
fps = 0;
} else
fps++;
update(now, dt);
draw();
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;
}