361 lines
9.8 KiB
C
361 lines
9.8 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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GRASS_DARK,
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FLAG_STEM,
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FLAG_FLAG,
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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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#include "grass_tile.inc"
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#include "dirt_tile.inc"
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#include "flag_tile.inc"
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static char tilemap[] = " "
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" "
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" "
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"! g "
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"gg g "
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" g"
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" g "
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" g "
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" gdg "
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"ggggdddggg";
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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 double jump_maxhold = 0.3;
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static double jump_maxheight = 21;
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static double jump_duration = 0.4;
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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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case KBKEY_Q: jump_maxhold += 0.1; break;
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case KBKEY_A: jump_maxhold -= 0.1; break;
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case KBKEY_W: jump_maxheight += 0.1; break;
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case KBKEY_S: jump_maxheight -= 0.1; break;
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case KBKEY_E: jump_duration += 0.1; break;
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case KBKEY_D: jump_duration -= 0.1; break;
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}
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//printf("hold %i height %i duration %i\n", (int)(jump_maxhold * 10), (int)(jump_maxheight * 10), (int)(jump_duration * 10));
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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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static char sample_tilemap(size_t x, size_t 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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if (tx >= TILES || ty >= TILES) return ' ';
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return tilemap[ty * TILES + tx];
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}
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static bool jumping = false;
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static bool on_ground = false;
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static double jump_start_y;
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static double in_jump;
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static double player_x = 0, player_y = 80;
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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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if (on_ground && jump_held && !jumping) {
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jumping = true;
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in_jump = 0;
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jump_start_y = player_y;
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}
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if (!on_ground && !jumping) {
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jumping = true;
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in_jump = jump_duration;
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jump_start_y = player_y + jump_maxheight;
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}
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if (jumping) {
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in_jump += dt;
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// Jump is a quadratic arc
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// h = at^2 + bt + c
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//
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// Beginning of jump, zero height
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// t = 0, h = 0
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// 0 = a0^2 + b0 + c
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// c = 0
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//
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// At 2*duration, zero height
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// t = 2T, h = 0
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// 0 = a(2T)^2 + b(2T) + 0
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// 0 = 4aT^2 + 2bT
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// 0 = 2aT^2 + bT
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// 0 = 2aT + b
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// b = -2aT
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//
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// At duration, maximum height
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// t = T, h = H
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// H = aT^2 + bT + 0
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// H = aT^2 - 2aT^2
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// H = -aT^2
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// a = -H / (T^2)
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// b
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double a = -jump_maxheight / (jump_duration * jump_duration);
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double b = -2 * a * jump_duration;
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double jump_height = a * in_jump * in_jump + b * in_jump;
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player_y = jump_start_y - jump_height;
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// player_dy is negative of derivative of jump_height
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// H = a*t^2 + b*t
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// H' = 2*a*t + b
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player_dy = -2 * a * in_jump - b;
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}
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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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size_t px = player_x;
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size_t py = player_y;
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size_t left_cx = px - 1;
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size_t right_cx = px + TILE_SIDE;
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size_t leftright_top_cy = py;
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size_t leftright_bottom_cy = py + TILE_SIDE - 3; //XXX: proper handling of snapping
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if ((sample_tilemap(left_cx, leftright_top_cy) != ' ' ||
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sample_tilemap(left_cx, leftright_bottom_cy) != ' ') &&
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player_dx < 0) {
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size_t snapped_px = (px + TILE_SIDE - 1) / TILE_SIDE * TILE_SIDE;
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player_x = snapped_px;
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player_dx = 0;
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}
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if ((sample_tilemap(right_cx, leftright_top_cy) != ' ' ||
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sample_tilemap(right_cx, leftright_bottom_cy) != ' ') &&
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player_dx > 0) {
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size_t snapped_px = px / TILE_SIDE * TILE_SIDE;
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player_x = snapped_px;
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player_dx = 0;
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}
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px = player_x;
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py = player_y;
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size_t topbottom_left_cx = px;
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size_t topbottom_right_cx = px + TILE_SIDE - 1;
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size_t top_cy = py - 1;
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size_t bottom_cy = py + TILE_SIDE;
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on_ground = false;
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if (sample_tilemap(topbottom_left_cx, bottom_cy) != ' ' ||
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sample_tilemap(topbottom_right_cx, bottom_cy) != ' ') {
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on_ground = true;
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if (player_dy > 0) {
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jumping = false;
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size_t snapped_py = py / TILE_SIDE * TILE_SIDE;
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player_y = snapped_py;
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}
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}
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if ((sample_tilemap(topbottom_left_cx, top_cy) != ' ' ||
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sample_tilemap(topbottom_right_cx, top_cy) != ' ') &&
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player_dy < 0) {
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size_t snapped_py = (py + TILE_SIDE - 1) / TILE_SIDE * TILE_SIDE;
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player_y = snapped_py;
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in_jump = jump_duration;
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jump_start_y = player_y + jump_maxheight;
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}
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}
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static void draw_tile(enum palette 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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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 = tile[ty * TILE_SIDE + tx];
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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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enum palette *tile = NULL;
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switch(tilemap[ty * TILES + tx]) {
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case 'g': tile = grass_tile; break;
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case 'd': tile = dirt_tile; break;
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case '!': tile = flag_tile; break;
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}
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if (tile)
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draw_tile(tile, tx * TILE_SIDE, ty * TILE_SIDE);
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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_tile(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, 220, 0),
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[GRASS_BROWN] = make_color(200, 128, 0),
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[GRASS_DARK] = make_color(100, 64, 0),
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[FLAG_STEM] = make_color(0, 0, 0),
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[FLAG_FLAG] = make_color(255, 0, 0),
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[ERROR] = make_color(255, 0, 255),
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};
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long fps_cap = 100;
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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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