Linux Terminal Game

Code created during recording the Linux Terminal Game from Scratch video series.

Videos

Linux Terminal Game from Scratch I - Termios, ANSI Escape Codes

Linux Terminal Game from Scratch II - Game Loop, Rendering, Level Loading

Linux Terminal Game from Scratch III - Gameplay

Linux Terminal Game from Scratch IV - Tests, Rendering, Colors, Animations

Requirements

Just a C compiler :)

Build

gcc -std=gnu17 -Wall -Wextra -O2 ./game.c -o game

Play

./game

Implementation Stages

Stage 1

Non-canonical input mode
Turning off echo
Proper reset on exit (both for normal exit and abnormal exit)
Rudimentary game loop
Grab the arrow keys
Print them out (e.g. RIGHT)

Stage 2

Empty level with borders
Player can walk around within the borders

Stage 3

Optimize rendering
Optimize game loop

Stage 4

Load up level from a file

Stage 5

Gameplay

Stage 6

Tests

Stage 7

Rendering
Colors
Animations?

Gameplay

Game Elements

@ - Player Character
X - Wall
$ - Gems / Gold
O - Rock
. - Earth
  - Space/Empty
E - Exit

Rules

Player can dig a tunnel through Earth
Rocks/Gems fall down if there is space below them
Rocks/Gems falling on Player ends the game -> Lose Scenario
Player entering Exit ends the game -> Win scenario
Player can't go through Wall, Rock
Player can collect Gems

Composite Rules

This is stable

.O.
.O.

This is unstable -> Top rock rolls to the left

. O..
. O..

This is unstable -> Top rock rolls to the right

..O .
..O .

However, this is stable

.O ...
XX XXX

Rocks and Gems behave similarly in most of the time. For example, a Gem can kill the player if it falls on its head.

Player can push a rock horizontally if there is empty Space behind the Rock. In the scenario below, the Player can push the rocks right or left.

.. O@O ..
.........

General Game Requirements

Display Graphics

Low resolution
ASCII characters (subpixels, textures)
Colors (foreground, background)
Move the cursor's position freely

Input Handling

Canonical Mode - line based
Non-Canonical Input Mode - More control over input
RAW Input Mode
Turn off Echo

Sound and Music:

:(
Terminal Bell - NO

Toolbox

man 3 termios
ANSII Escape Codes - https://en.m.wikipedia.org/wiki/ANSI_escape_code

ANSI Escape Codes

FG Color

Paremeters: R G B

printf "\x1B[:38;2;R;G;Bm"

BG Color

Parameters: R G B

printf "\x1B[48;2;R;G;Bm"

Moving the cursor

Move Cursor To (x, y) - Upper Left Corner is (1, 1) Paremeters: X Y

printf "\x1B[Y;XH"

Clear Screen

printf "\x1B[2J"

Hide Cursor

printf "\x1B[?25l"

Show Cursor

printf "\x1B[?25h"

Reset Colors

printf "\x1B[m"

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