engine

type Config struct {
	// Enable music
	MusicEnabled bool

	// Enable sounds
	SoundsEnabled bool

	// Enable accelerometer
	AccelerometerEnabled bool

	// Accelerometer threshold
	AccelThreshold float64

	// Touch threshold
	TouchThreshold float64

	// Enable haptic
	HapticEnabled bool

	// Show frames per second
	ShowFps bool

	// Maximum frames per second
	MaxFps int

	// Barrier speed
	BarrierSpeed float64

	// Ship bounciness from screen edges
	Bounciness float64

	// Number of rock prototypes
	NRocks int

	// Number of rock structs to allocate
	MaxRocks int

	// Number of powups structs to allocate
	MaxPowups int

	// How often to generate powups
	PowupsTimeout int

	// How much milliseconds powup lasts
	PowupStateTimeout float64

	// Scale powup text
	PowupTextScale float64

	// Powup text timeout
	PowupTextTimeout float64

	// Number of animation sprites
	NFrames uint32

	// Gamespeed
	GameSpeed float64

	// Initial rocks
	InitialRocks int

	// Final rocks
	FinalRocks int

	// 32s for a speed=1 rock to cross the screen horizontally
	KH float64
	// 24s for a speed=1 rock to cross the screen vertically
	KV float64
	// range for rock dx values (+/-)
	RDX float64
	// range for rock dy values (+/-)
	RDY float64

	// Dust color depth
	MaxDustDepth float64

	// Number of dust motes
	NDustMotes int

	// Number od dust arrays
	NDustArray int

	// Maximum ship engine dots
	MaxShipDots int

	// Number od ship dots arrays
	NShipDotsArray int

	// Maximum bang dots
	MaxBangDots int

	// Number od bang dots arrays
	NBangDotsArray int

	// Ship thruster strength
	ThrusterStrength float64

	// How many engine dots come out of each thruster
	EngineDots int

	// Dots heat colors
	W int
	M int

	// Determines how hard dots push the rocks. Set to 0 to disable pushing rocks
	DotMassUnit float64

	// Time (in 1/60ths of a seccond) between when you blow up, and when next ship appears
	DeadPauseLength float64

	// Time (in milliseconds) to be invincible after next ship appears
	InvinciblePauseLength float64

	// Game over state timeout
	GameOverLength float64

	// Time (in milliseconds) to show scores screen after hiscore/gameover
	ScoresLength float64

	// Number of scores
	NScores int

	// Window width
	WinWidth float64

	// Window height
	WinHeight float64

	// X scroll
	XScrollTo float64
	// Y scroll
	YScrollTo float64

	// Distance ahead
	DistAhead float64

	// Maximum distance ahead
	MaxDistAhead float64

	// Credits scroll speed
	ScrollSpeed float64
}

type Engine struct {
	// Config
	Cfg *Config

	// Game state
	State StateMachine

	// SDL Window
	Window *sdl.Window
	// SDL Renderer
	Renderer *sdl.Renderer

	// Game controller
	Controller *sdl.GameController

	// Joystick
	Joystick *sdl.Joystick

	// Boolean set to true until exit
	Running bool

	// Screen X distance
	ScreenDX float64
	// Screen Y distance
	ScreenDY float64

	// Frames counter
	Frames int
	// Frames per second
	Fps float64
	// Maximum fps in ms
	FrameMs uint32

	// Start of frame (milliseconds)
	StartTicks uint32
	// End of frame (milliseconds)
	EndTicks uint32
	// Delta time between frames
	FrameDelta uint32
	// Length of frame adjusted for gamespeed
	TFrame float64
}

type Glyph struct {
	Image  *sdl.Texture
	Width  float64
	Height float64
}

type Resource struct {
	Engine *Engine

	DataDir string

	Mappings []string

	FontMain   *ttf.Font
	FontSmall  *ttf.Font
	FontTitle  *ttf.Font
	FontMedium *ttf.Font

	SoundClick      *mix.Chunk
	SoundBounce     *mix.Chunk
	SoundEngine1    *mix.Chunk
	SoundEngine2    *mix.Chunk
	SoundEngine3    *mix.Chunk
	SoundPowup0     *mix.Chunk
	SoundPowup1     *mix.Chunk
	SoundPowup2     *mix.Chunk
	SoundPowup3     *mix.Chunk
	SoundPowup4     *mix.Chunk
	SoundPowup5     *mix.Chunk
	SoundExplosion1 *mix.Chunk
	SoundExplosion2 *mix.Chunk

	MusicMenu *mix.Music
	MusicGame *mix.Music

	Ship     *sdl.Texture
	ShipSurf *sdl.Surface
	ShipGlow *sdl.Texture

	Powup     *sdl.Texture
	PowupSurf *sdl.Surface
	PowupGlow *sdl.Texture

	Life        *sdl.Texture
	Background1 *sdl.Texture
	Background2 *sdl.Texture
	Background3 *sdl.Texture
	Explosion1  *sdl.Texture
	Explosion2  *sdl.Texture

	LoadingText      *sdl.Texture
	TitleText        *sdl.Texture
	HiScoreText      *sdl.Texture
	HiScoreEnterText *sdl.Texture

	StartText     *sdl.Texture
	StartTextHi   *sdl.Texture
	ScoresText    *sdl.Texture
	ScoresTextHi  *sdl.Texture
	OptionsText   *sdl.Texture
	OptionsTextHi *sdl.Texture
	CreditsText   *sdl.Texture
	CreditsTextHi *sdl.Texture

	ProgrammingText          *sdl.Texture
	ProgrammingCreditText    *sdl.Texture
	MusicAndSoundsText       *sdl.Texture
	MusicAndSoundsCreditText *sdl.Texture
	GraphicsText             *sdl.Texture
	GraphicsCreditText       *sdl.Texture
	FontText                 *sdl.Texture
	FontCreditText           *sdl.Texture
	BasedText                *sdl.Texture
	BasedCreditText          *sdl.Texture
	SDLText                  *sdl.Texture
	SDLCreditText            *sdl.Texture
	GoText                   *sdl.Texture
	GoCreditText             *sdl.Texture
	VoVText                  *sdl.Texture
	VoVCreditText            *sdl.Texture

	MusicText           *sdl.Texture
	MusicTextHi         *sdl.Texture
	SoundsText          *sdl.Texture
	SoundsTextHi        *sdl.Texture
	AccelerometerText   *sdl.Texture
	AccelerometerTextHi *sdl.Texture
	HapticText          *sdl.Texture
	HapticTextHi        *sdl.Texture
	ShowFpsText         *sdl.Texture
	ShowFpsTextHi       *sdl.Texture

	YesText *sdl.Texture
	NoText  *sdl.Texture

	FpsText  *sdl.Texture
	TimeText *sdl.Texture

	ShieldsText     *sdl.Texture
	AttackText      *sdl.Texture
	InvincibleText  *sdl.Texture
	EngineBlastText *sdl.Texture
	SlowdownText    *sdl.Texture

	LifePowText        *sdl.Texture
	ShieldsPowText     *sdl.Texture
	AttackPowText      *sdl.Texture
	InvinciblePowText  *sdl.Texture
	EngineBlastPowText *sdl.Texture
	SlowdownPowText    *sdl.Texture

	PausedText   *sdl.Texture
	GameOverText *sdl.Texture

	Rocks     []*sdl.Texture
	RocksSurf []*sdl.Surface

	Glyphs           []string
	GlyphMapSmall    map[string]*Glyph
	GlyphMapSmallRed map[string]*Glyph
	GlyphMapMedium   map[string]*Glyph
	GlyphMapLarge    map[string]*Glyph
}

type State interface {
	OnInit() bool
	OnQuit() bool

	String() string

	HandleEvents()
	Update()
	Draw()
}

type StateMachine struct {
	// contains filtered or unexported fields
}