commit ca7d40c93b6060f347cda98d8dd6dca810c051e3 Author: Juhani Krekelä Date: Fri Jan 14 14:03:24 2022 +0000 2022-01-13 diff --git a/CC0 b/CC0 new file mode 100644 index 0000000..670154e --- /dev/null +++ b/CC0 @@ -0,0 +1,116 @@ +CC0 1.0 Universal + +Statement of Purpose + +The laws of most jurisdictions throughout the world automatically confer +exclusive Copyright and Related Rights (defined below) upon the creator and +subsequent owner(s) (each and all, an "owner") of an original work of +authorship and/or a database (each, a "Work"). + +Certain owners wish to permanently relinquish those rights to a Work for the +purpose of contributing to a commons of creative, cultural and scientific +works ("Commons") that the public can reliably and without fear of later +claims of infringement build upon, modify, incorporate in other works, reuse +and redistribute as freely as possible in any form whatsoever and for any +purposes, including without limitation commercial purposes. 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+ +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; +}