game.c

#include "audio.h"
#include "graphics.h"
#include "highscore.h"
#include "image_arrays.h"
#include "object.h"
#include <pic32mx.h> /* Declarations of system-specific addresses etc */

int ingame = 0;
screenstate *current_level_screen;

/// Resets game variables and starts the game by setting ingame = 1
/// The game loop will then run in the sound ISR
void play_level(int level) {
  current_score = 0;
  player_jumpflag = 1;
  player.vel.x = 0;
  player.vel.y = 0;
  player.pos.x = 4;
  player.pos.y = 0;
  if (level == 0) {
    current_level_screen = &stage1_screen;
  } else if (level == 1) {
    current_level_screen = &stage2_screen;
  }
  current_level_screen->current_scroll_amount = 0;
  ingame = 1; // enables game logic in song_isr
  song_init(level);
  while (ingame)
    ; // loop until game over;
  song_stop();
}

void timer_init() {
  // Game timer initialization
  T3CON = 0x0070;         // Set timer off and prescale to 1:256
  TMR3 = 0x0;             // Reset timer count
  PR3 = 6250;             // Set period to get total of 0.04 sec
  IFSCLR(0) = 0x00001000; // Make sure the time-out flag is cleared
  T3CONSET = 0x8000;      // Turn the timer on again
  IPCSET(3) = 0x1f;       // Set priority to max
  IECSET(0) = 0x1000;     // Enable interupts for Timer 3
}

/// Ends the game
void game_over() {
  ingame = 0;
  if (current_score > current_highscore) {
    current_highscore = current_score;
    show_enter_highscore_screen();
  } else {
    refresh_screen(&game_over_screen);
    put_short_string(0, "", 0);
    put_short_string(1, "   GAME OVER", 12);
    put_short_string(2, "   YOU LOST", 11);
    put_short_string(3, "", 0);
    add_textbuffer_to_screen(&game_over_screen);
    draw_entire_display(&game_over_screen);
    quicksleep(3000000);
  }
  return;
}

/// Moves the level and the player and updates game graphics.
void update_game() {
  // If the game hasn't progressed to its end
  if (current_level_screen->current_scroll_amount <=
      current_level_screen->entire_image_width - 128) {
    if (!btn_dwn_flag) {
      if (PORTF & 0b10 && player_jumpflag == 0) {
        player.vel.y = -5;
        player_jumpflag = 1;
        btn_dwn_flag = 1;
      }

      if ((PORTD & 0b1000000) && player.pos.x > 0) { // move left
        player.vel.x = -1;
        btn_dwn_flag = 1;
      } else if ((PORTD & 0b100000) && player.pos.x < 127) { // move right
        player.vel.x = 1;
        btn_dwn_flag = 1;
      }
    } else if (!(PORTF & 0b10 || PORTD & 0b11100000)) {
      btn_dwn_flag = 0;
      player.vel.x = 0;
    }

    //         För att kolla om programmet kraschar:
    //  if (PORTE == 1){
    //      PORTE = 0;
    //  } else{
    //      PORTE = 1;
    //  }
    refresh_screen(current_level_screen);
    move_background(current_level_screen, 1);
    if (move_object(current_level_screen, &player)) { // if game is over
      btn_dwn_flag = 1;
      return;
    }
    add_object_to_screen(&player, current_level_screen);
    draw_entire_display(current_level_screen);
    // Highscore is percentage of level completed
    current_score = (current_level_screen->current_scroll_amount * 100) /
                    (current_level_screen->entire_image_width - 128);
  } else {
    refresh_screen(&game_over_screen);
    put_string(0, "YOU WON!!!!!!!!!");
    put_string(1, "YOU WON!!!!!!!!!");
    put_string(2, "YOU WON!!!!!!!!!");
    put_string(3, "YOU WON!!!!!!!!!");
    add_textbuffer_to_screen(&game_over_screen);
    draw_entire_display(&game_over_screen);
    quicksleep(5000000);
    game_over();
  }
}