From dd038cfb10cae6dba5afabc786a129224da5ef8c Mon Sep 17 00:00:00 2001
From: Aleksa Vučković <aleksav013@gmail.com>
Date: Wed, 1 Jun 2022 17:02:08 +0200
Subject: simple snake game

---
 src/c/shell/game.c | 135 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100644 src/c/shell/game.c

(limited to 'src/c/shell/game.c')

diff --git a/src/c/shell/game.c b/src/c/shell/game.c
new file mode 100644
index 0000000..e7c5d1e
--- /dev/null
+++ b/src/c/shell/game.c
@@ -0,0 +1,135 @@
+#include<source/shell/game.h>
+#include<types.h>
+#include<source/vga.h>
+#include<source/tty.h>
+#include<source/timer.h>
+#include<source/stdio.h>
+
+extern uint16_t* terminal_buffer;
+extern uint8_t terminal_color;
+extern uint8_t process_id;
+
+#define N 1000
+
+uint16_t x;
+uint16_t y;
+uint16_t rep[N];
+
+uint32_t game_time;
+uint32_t game_tick;
+uint8_t gameover;
+uint8_t duzina;
+uint8_t smer;
+
+uint16_t jabuka;
+uint16_t x_jabuke;
+uint16_t y_jabuke;
+
+void game_keyboard_handler(uint16_t keycode)
+{
+    switch(keycode)
+    {
+    //  space();
+        case 0x39:
+            process_id = PROCESS_TTY_ID;
+            clear();
+            prompt();
+            break;
+    //  keyup();
+        case 72:
+            smer = 1;
+            break;
+    //  keydown();
+        case 80:
+            smer = 2;
+            break;
+    //  keyleft();
+        case 75:
+            smer = 3;
+            break;
+    //  keyright();
+        case 77:
+            smer = 4;
+            break;
+    }
+}
+
+void game_init(void)
+{
+    x=VGA_WIDTH/2;
+    y=VGA_HEIGHT/2;
+    game_time=0;
+    game_tick=0;
+    duzina=1;
+    gameover=0;
+    smer=0;
+
+    x_jabuke=5;
+    y_jabuke=5;
+
+    process_id = PROCESS_GAME_ID;
+    clear();
+}
+
+void game_timer_handler()
+{
+    game_tick++;
+    if (game_tick == TICKS_PER_SECOND/8 && !gameover)
+    {
+        switch(smer)
+        {
+            case 1:
+                if(y>0) y--;
+                else y=VGA_HEIGHT-1;
+                break;
+            case 2:
+                if(y<VGA_HEIGHT) y++;
+                else y=0;
+                break;
+            case 3:
+                if(x>0) x--;
+                else x=VGA_WIDTH-1;
+                break;
+            case 4:
+                if(x<VGA_WIDTH) x++;
+                else x=0;
+                break;
+            default:
+                break;
+        }
+        game_tick=0;
+        game_time+=1;
+
+        for(uint8_t i = duzina; i > 0; i--) rep[i]=rep[i-1];
+        rep[0]=(uint16_t)(y*80+x);
+
+        if (rep[0] == y_jabuke*80+x_jabuke)
+        {
+            duzina++;
+
+            uint8_t ind;
+            do {
+                ind = 1;
+                x_jabuke = (uint16_t)((game_time*game_time)%80);
+                y_jabuke = (uint16_t)((game_time*game_time)%25);
+                jabuka = (uint16_t)(y_jabuke*80+x_jabuke);
+                for(uint8_t i = 0; i < duzina; i++) if(rep[i] == jabuka) ind=0;
+                game_time++;
+            } while(!ind);
+
+            terminal_buffer[jabuka]=(uint16_t)(terminal_color<<8|'J');
+        }
+        terminal_buffer[rep[duzina]]=(uint16_t)(terminal_color<<8|' ');
+        terminal_buffer[rep[0]]=(uint16_t)(terminal_color<<8|'#');
+
+        set_color(VGA_COLOR_RED,VGA_COLOR_BLACK);
+        terminal_buffer[y_jabuke*80+x_jabuke]=(uint16_t)(terminal_color<<8|'J');
+        set_color(VGA_COLOR_LIGHT_GREY,VGA_COLOR_BLACK);
+
+        for(uint8_t i = 1; i < duzina; i++) if(rep[0] == rep[i])
+        {
+            printf("GAME OVER\nPress <Space> to return to shell\n");
+            gameover=1;
+        }
+    }
+}
-- 
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