273 lines
7.4 KiB
C
273 lines
7.4 KiB
C
#include <sys/keycodes.h>
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#include <assert.h>
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#include <display.h>
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#include <err.h>
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#include <errno.h>
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#include <pixel.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <time.h>
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#include <timespec.h>
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#define PLAYFIELD_SIDE 100
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#define TILE_SIDE 10
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#define TILES (PLAYFIELD_SIDE / TILE_SIDE)
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enum palette {
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BG = 0,
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TEXT,
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GRASS_TOP,
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GRASS_BROWN,
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ERROR,
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};
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static enum palette playfield[PLAYFIELD_SIDE * PLAYFIELD_SIDE];
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static char tilemap[] = " "
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" "
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" "
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" "
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"gg "
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" "
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" "
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" g "
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" g g "
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"gggggggggg";
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static uint32_t main_window = 0;
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static uint32_t window_width = 600;
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static uint32_t window_height = 500;
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static bool game_running = true;
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static void on_disconnect(void *context) {
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(void) context;
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game_running = false;
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}
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static bool left_held, right_held, jump_held;
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static void on_keyboard(void *context, uint32_t window, uint32_t codepoint) {
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(void) context;
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if (window != main_window)
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return;
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int key = KBKEY_DECODE(codepoint);
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switch (key) {
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// TODO: rebinding
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case KBKEY_LEFT: left_held = true; break;
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case -KBKEY_LEFT: left_held = false; break;
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case KBKEY_RIGHT: right_held = true; break;
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case -KBKEY_RIGHT: right_held = false; break;
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case KBKEY_SPACE: jump_held = true; break;
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case -KBKEY_SPACE: jump_held = false; break;
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}
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}
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static void on_quit(void *context, uint32_t window) {
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(void) context;
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if (window != main_window)
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return;
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game_running = false;
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}
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static void on_resize(void *context, uint32_t window, uint32_t width, uint32_t height) {
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(void) context;
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if (window != main_window)
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return;
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window_width = width;
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window_height = height;
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}
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static double timespec2double(struct timespec ts) {
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return ts.tv_sec + ts.tv_nsec / 1000.0 / 1000.0 / 1000.0;
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}
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char sample_tilemap(double x, double y) {
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size_t tx = x / TILE_SIDE;
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size_t ty = y / TILE_SIDE;
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assert(tx < TILES);
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assert(ty < TILES);
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return tilemap[ty * TILES + tx];
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}
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static double player_x, player_y;
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static double player_dx, player_dy;
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static void update(struct timespec now, struct timespec dt_timespec) {
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(void) now;
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double dt = timespec2double(dt_timespec);
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player_x += player_dx * dt;
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player_y += player_dy * dt;
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if (left_held) player_dx = -30;
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else if (right_held) player_dx = 30;
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else player_dx = 0;
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// Collision against walls of the map
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if (player_x < 0) {
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player_x = 0;
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player_dx = 0;
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} else if (player_x > PLAYFIELD_SIDE - TILE_SIDE) {
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player_x = PLAYFIELD_SIDE - TILE_SIDE;
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player_dx = 0;
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}
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if (player_y < 0) {
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player_y = 0;
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player_dy = 0;
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} else if (player_y > PLAYFIELD_SIDE - TILE_SIDE) {
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player_y = PLAYFIELD_SIDE - TILE_SIDE;
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player_dy = 0;
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}
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// Collision against tiles
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char topleft = sample_tilemap(player_x, player_y);
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char topright = sample_tilemap(player_x + TILE_SIDE, player_y);
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char bottomleft = sample_tilemap(player_x, player_y + TILE_SIDE);
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char bottomright = sample_tilemap(player_x + TILE_SIDE, player_y + TILE_SIDE);
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bool on_ground = false;
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if (bottomleft != ' ' || bottomright != ' ')
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on_ground = true;
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if (topleft != ' ' || topright != ' ' || bottomleft != ' ' || bottomright != ' ')
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player_dx = 0;
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if (on_ground)
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player_dy = 0;
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else
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player_dy = 30;
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}
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static void draw_grass_tile(size_t x, size_t y) {
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assert(x + TILE_SIDE <= PLAYFIELD_SIDE);
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assert(y + TILE_SIDE <= PLAYFIELD_SIDE);
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char grass_tile[] = "xxxxxxxxxx"
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"xx xx x x "
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" x x x "
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" "
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" "
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" "
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" "
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" "
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" "
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" ";
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assert(strlen(grass_tile) == TILE_SIDE * TILE_SIDE);
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for (size_t ty = 0; ty < TILE_SIDE; ty++) {
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for (size_t tx = 0; tx < TILE_SIDE; tx++) {
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enum palette pixel;
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switch (grass_tile[ty * TILE_SIDE + tx]) {
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case 'x': pixel = GRASS_TOP; break;
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case ' ': pixel = GRASS_BROWN; break;
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default: pixel = ERROR; break;
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}
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playfield[(y + ty) * PLAYFIELD_SIDE + x + tx] = pixel;
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}
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}
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}
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static void draw_tiles(void) {
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assert(strlen(tilemap) == TILES * TILES);
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for (size_t ty = 0; ty < TILES; ty++) {
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for (size_t tx = 0; tx < TILES; tx++) {
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switch(tilemap[ty * TILES + tx]) {
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case 'g': draw_grass_tile(tx * TILE_SIDE, ty * TILE_SIDE); break;
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}
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}
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}
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}
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static void draw(void) {
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memset(playfield, 0, sizeof(playfield));
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draw_tiles();
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draw_grass_tile(player_x, player_y);
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}
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int main(int argc, char *argv[]) {
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struct display_connection *connection = display_connect_default();
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if (!connection && errno == ECONNREFUSED)
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display_spawn(argc, argv);
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if (!connection)
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err(1, "Could not connect to display server");
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display_create_window(connection, main_window);
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display_resize_window(connection, main_window, window_width, window_height);
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display_show_window(connection, main_window);
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struct display_event_handlers handlers = {0};
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handlers.disconnect_handler = on_disconnect;
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handlers.keyboard_handler = on_keyboard;
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handlers.quit_handler = on_quit;
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handlers.resize_handler = on_resize;
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uint32_t palette_colours[] = {
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[BG] = make_color(128, 128, 255),
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[TEXT] = make_color(255, 255, 255),
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[GRASS_TOP] = make_color(0, 255, 0),
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[GRASS_BROWN] = make_color(200, 128, 0),
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[ERROR] = make_color(255, 0, 255),
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};
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long fps_cap = 60;
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struct timespec min_dt = timespec_make(0, 1000L * 1000L * 1000L / fps_cap);
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struct timespec last_frame;
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clock_gettime(CLOCK_MONOTONIC, &last_frame);
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int fps = 0;
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while (game_running) {
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struct timespec now;
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clock_gettime(CLOCK_MONOTONIC, &now);
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struct timespec dt = timespec_sub(now, last_frame);
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if (timespec_lt(dt, min_dt)) {
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struct timespec sleep = timespec_sub(min_dt, dt);
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nanosleep(&sleep, NULL);
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continue;
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}
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if (last_frame.tv_sec != now.tv_sec) {
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char *title = NULL;
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asprintf(&title, "%i fps", fps);
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display_title_window(connection, main_window, title);
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free(title);
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fps = 0;
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} else
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fps++;
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update(now, dt);
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draw();
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size_t pixels;
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if (__builtin_mul_overflow(window_width, window_height, &pixels))
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errx(1, "Window size too big");
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uint32_t *framebuffer = calloc(pixels, sizeof(uint32_t));
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uint32_t shorter_side = window_height < window_width ? window_height : window_width;
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size_t y_offset = (window_height - shorter_side) / 2;
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size_t x_offset = (window_width - shorter_side) / 2;
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for (size_t y = 0; y < window_height; y++) {
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for (size_t x = 0; x < window_width; x++) {
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if (y < y_offset || x < x_offset ||
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y >= y_offset + shorter_side || x >= x_offset + shorter_side)
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framebuffer[y * window_width + x] = make_color_a(0, 0, 0, 200);
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else {
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size_t pf_x = (x - x_offset) * PLAYFIELD_SIDE / shorter_side;
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size_t pf_y = (y - y_offset) * PLAYFIELD_SIDE / shorter_side;
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uint32_t colour = palette_colours[playfield[pf_y * PLAYFIELD_SIDE + pf_x]];
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framebuffer[y * window_width + x] = colour;
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}
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}
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}
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display_render_window(connection, main_window, 0, 0, window_width, window_height, framebuffer);
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free(framebuffer);
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while (!display_poll_event(connection, &handlers));
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last_frame = now;
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}
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display_disconnect(connection);
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return 0;
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}
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