Videogiochi in PHP 👾

VIDEOGIOCHI IN PHP
👾
dal game loop alle collisioni
Manuel Baldassarri | PHPDay GrUSP edition 2022

PHP EXTENSIONS
Mysql - Postgres - Curl - GD - Json - Intl - ...
Memcache - ImageMagick - MongoDB - Redis - ...

SDL
Simple DirectMedia Layer
cross-platform: Windows, MacOS, Linux, iOS, Android
audio, keyboard, mouse, game controller
graphics hardware via OpenGL, Direct3D and Vulkan

TODO
Install deps
Window
Renderer
Game loop
Input
Collision

INSTALL DEPS
pecl install sdl-beta
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WINDOW
SDL_Init(SDL_INIT_VIDEO);
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$window = SDL_CreateWindow(
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'This is not a window',
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SDL_WINDOWPOS_UNDEFINED, // SDL_WINDOWPOS_CENTERED
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800,
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400,
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0 // SDL_WINDOW_(FULLSCREEN|HIDDEN|RESIZABLE)
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// SDL_WINDOW_(OPENGL|VULKAN|METAL)
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);
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sleep(10);
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SDL_DestroyWindow($window);
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SDL_Quit();
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800,
400,
);
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sleep(10);
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SDL_Quit();
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sleep(10);
SDL_Quit();
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800,
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400,
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);
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RENDERER
$renderer = SDL_CreateRenderer($window, 0, 0);
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$window = SDL_CreateWindow(...);
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$orange = [0xd7, 0x6b, 0x2b, 0];
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SDL_SetRenderDrawColor($renderer, ...$orange);
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SDL_RenderClear($renderer);
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SDL_SetRenderDrawColor($renderer, 230, 230, 230, 255);
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SDL_RenderDrawRect($renderer, new SDL_Rect(100, 100, 100, 200
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SDL_RenderDrawRect($renderer, new SDL_Rect(110, 110, 80, 180)
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SDL_RenderPresent($renderer);
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SDL_Delay(10000);
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SDL_DestroyRenderer($renderer);
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i d $ i d
1
$orange = [0xd7, 0x6b, 0x2b, 0];
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SDL_Delay(10000);
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i d $ i d
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$orange = [0xd7, 0x6b, 0x2b, 0];
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SDL_Delay(10000);
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i d $ i d
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$orange = [0xd7, 0x6b, 0x2b, 0];
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SDL_Delay(10000);
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i d $ i d
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$orange = [0xd7, 0x6b, 0x2b, 0];
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SDL_Delay(10000);
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i d $ i d
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$orange = [0xd7, 0x6b, 0x2b, 0];
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SDL_Delay(10000);
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i d $ i d
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SDL_Delay(10000);
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$orange = [0xd7, 0x6b, 0x2b, 0];
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i d $ i d
1

DRAW FUNCTIONS
SDL_RenderDrawPoint
SDL_RenderDrawLine
SDL_RenderDrawRect
SDL_RenderFillRect
SDL_RenderCopy
SDL_RenderCopyEx
SDL_RenderDrawPointF
SDL_RenderDrawLineF
SDL_RenderDrawRectF
SDL_RenderFillRectF
SDL_RenderCopyF
SDL_RenderCopyExF

SDL_RECT
class SDL_Rect {
public int $x;
public int $y;
public int $w;
public int $h;
}
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SDL_FRECT
class SDL_FRect {
public float $x;
public float $y;
public float $w;
public float $h;
}
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TEXTURE
$surface = SDL_LoadBMP(__DIR__."/spaceship.bmp");
$texture = SDL_CreateTextureFromSurface($renderer, $surface);
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SDL_IMAGE EXTENSION
pecl install sdl_image-devel
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$texture = IMG_LoadTexture($renderer, $imageFilename);
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PNG, JPG, BMP, TGA, TIF, ...

SDL_RENDERCOPY
SDL_RenderCopy(
$renderer,
$texture,
SDL_Rect $sourceRect,
SDL_Rect $destinationRect
)
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SPRITE
$texture = IMG_LoadTexture($renderer, __DIR__."/barrel.png");
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$sourceRect = new SDL_Rect(0, 0, 40, 40);
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$destRect = new SDL_Rect(400, 200, 40, 40);
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SDL_RenderCopy($renderer, $texture, $sourceRect, $destRect);
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SDL_RenderCopy($renderer, $texture, $sourceRect, $destRect);
6 SDL_RenderCopy($renderer, $texture, $sourceRect, $destRect);
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SPRITE
SDL_RenderCopyEx(
$renderer,
$texture,
SDL_Rect $sourceRect,
SDL_Rect$destRect,
float $rotationAngle,
SDL_Point $rotationCenter,
int $flip
// SDL_FLIP_NONE | SDL_FLIP_HORIZONTAL | SDL_FLIP_VERTICAL
)
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LEVEL
+
$level = [
"XXXXX XXXXXXXX XXXXX",
" ",
" ",
" ",
" ",
" XXXXXXX XXXXXXX ",
" ",
" ",
" ",
" XXXXXXXXXXXXXXXXXXXXXX ",
" ",
" ",
" ",
"XXXXXXXXX XXXXXXXXX",
" ",
" "
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GAME LOOP
/* Init window/renderer/load images */
do {
// a lot of stuff
} while (!$quit);
/* Clean the kitchen */
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GAME LOOP
/* Init window/renderer/load images */
$event = new SDL_Event();
do {
SDL_PollEvent($event);
$inputStatus = checkInput();
$quit = updateGame($inputStatus, $event);
render();
} while (!$quit);
/* Clean the kitchen */
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UPDATE
class Player {
private int SPEED = 1; // pixels per loop
private int $x;
public function update() {
$this->x += self::SPEED;
}
public function render($renderer) {
$renderer->drawItPlease($playerTexture, $this->x);
}
}
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UPDATE
class Player {
private int SPEED = 30; // pixels per second
private int $x;
public function update(float $deltaTime) {
$this->x += self::SPEED * $deltaTime;
}
}
}
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private int $x;
class Player {
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}
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}
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}
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UPDATE
private float $x;
class Player {
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}
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$renderer->drawItPlease($playerTexture, (int)$this->x);
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}
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}
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COLLISIONS WITH AXIS-ALIGNED BOUNDING BOX

COLLISIONS WITH AABB
$rect1 = SDL_Rect($x1, $y1, $w1, $h1);
$rect2 = SDL_Rect($x2, $y2, $w2, $h3);
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2

SDL_HasIntersection(SDL_Rect $rect1, SDL_Rect $rect2): bool
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$rect1->HasIntersection($rect2);
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COLLISIONS
5px
20px
SDL_IntersectRect(
SDL_Rect $rect1, SDL_Rect $rect2, SDL_Rect &$intersection
)
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3

JOYSTICK
SDL_Init(SDL_INIT_VIDEO | SDL_INIT_JOYSTICK);
$joystick = SDL_JoystickOpen(0);
if ($joystick !== null) {
// Joystick could not be found
}
$xJoystickMotion = SDL_JoystickGetAxis($joystick, 0);
$yJoystickMotion = SDL_JoystickGetAxis($joystick, 1);
// SDL_JoystickGetAxis($j, $xOrY): int (-32768 to 32767)
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KEYBOARD
$numKeys = 0;
$keys = SDL_GetKeyboardState($numKeys, false);
if (in_array(SDL_SCANCODE_LEFT, $keys)) { // left arrow presse
$goToLeft = true;
}
if (in_array(SDL_SCANCODE_Q, $keys)) { // q or Q pressed
$quit = true;
}
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SDL_MIXER EXTENSION
~60 functions for playing music and sfx
pecl install sdl_mixer-devel
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STATE OF THE ART (KPI*)
PHP: 20
* Kea Perception Index
Python: 500K
C/C++/C#: 100M

GRAZIE!
Manuel Baldassarri

Twitter @k3a

Github @kea

https://wireframe.raspberrypi.org/books/code-the-classics1
https://github.com/kea/code-the-classics1-php
https://www.libsdl.org/
https://github.com/easysoft/phpmicro

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