func MainLoop(renderer *sdl.Renderer, font *ttf.Font) {
lastTick := sdl.GetTicks()
lastSecond := lastTick
frames := 0
fpsText := gfx.CreateText(renderer, font, "FPS: ... "+StatusCallback(), sdl.Color{255, 255, 255, 255})
framesPerSecond := 0
for running {
tick := sdl.GetTicks()
if tick < lastTick+10 {
sdl.Delay(1)
continue
}
delta := float64(tick-lastTick) / 1000.0
lastTick = tick
fpsText.Destroy()
fpsText = gfx.CreateText(renderer, font, fmt.Sprintf("FPS: %3d ", framesPerSecond)+StatusCallback(), sdl.Color{255, 255, 255, 255})
if tick > (lastSecond + 1000) {
lastSecond = tick
framesPerSecond = frames
frames = 0
} else {
frames++
}
handleEvents()
UpdateCallback(delta)
renderer.SetDrawColor(0, 0, 0, 0)
renderer.Clear()
RenderCallback(renderer)
gfx.RenderTexture(renderer, fpsText, 0, 0)
renderer.Present()
}
fpsText.Destroy()
}
func main() {
if sdl.Init(sdl.INIT_EVERYTHING) != 0 {
error("Error initializing SDL")
return
}
defer sdl.Quit()
ttf.Init()
window := sdl.CreateWindow("Hello World!", 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT,
sdl.WINDOW_SHOWN)
if window == nil {
error("Error opening window")
return
}
defer window.Destroy()
renderer := sdl.CreateRenderer(window, -1, sdl.RENDERER_ACCELERATED)
if renderer == nil {
error("Error creating renderer")
return
}
defer renderer.Destroy()
texture := img.LoadTexture(renderer, "assets/images/exampletexture_2.png")
if texture == nil {
error("Error creating texture")
return
}
defer texture.Destroy()
font, err := ttf.OpenFont("assets/fonts/ComicNeue-Regular.ttf", 18)
if err != nil {
log.Printf("Error when loading font: %v", error)
return
}
defer font.Close()
ok := mix.OpenAudio(22050, mix.DEFAULT_FORMAT, 2, 1024)
if !ok {
error("Can't open audio")
return
}
defer mix.CloseAudio()
mix.AllocateChannels(2)
// Might have to convert sound effects to wav to load them as audio
// and not music?
shoot := mix.LoadMUS("assets/audio/shoot.ogg")
if shoot == nil {
error("Can't load ogg sound")
return
}
defer shoot.Free()
explode := mix.LoadMUS("assets/audio/invaderkilled.ogg")
if explode == nil {
error("Can't load ogg sound")
return
}
defer explode.Free()
game.RenderCallback = func(r *sdl.Renderer) {
drawShip(r)
drawMissiles(r)
drawObstacles(r)
}
lastObstacleTick := sdl.GetTicks()
game.UpdateCallback = func(delta float64) {
energy += EnergyRegainedPerSecond * delta
if energy > 100. {
energy = 100.
}
moveSpeed := delta * 100
keystate := sdl.GetKeyboardState()
updateMissiles(moveSpeed * 3)
updateObstacles(delta, explode)
if sdl.GetTicks() > lastObstacleTick+500 && rand.Intn(20) == 0 {
lastObstacleTick = sdl.GetTicks()
size := rand.Float64()*20.0 + 10.0
y := rand.Float64() * SCREEN_HEIGHT
x := SCREEN_WIDTH + size
speed := rand.Float64()*80.0 + 50.0
obstacles = append(obstacles, Obstacle{x, y, speed, size, 0})
}
if keystate[sdl.SCANCODE_W] != 0 {
y -= moveSpeed
}
if keystate[sdl.SCANCODE_S] != 0 {
y += moveSpeed
}
if keystate[sdl.SCANCODE_A] != 0 {
x -= moveSpeed
}
if keystate[sdl.SCANCODE_D] != 0 {
x += moveSpeed
}
if keystate[sdl.SCANCODE_RSHIFT] != 0 {
currentTick := sdl.GetTicks()
if currentTick > lastFire+300 && energy > EnergyCostPerShot {
lastFire = currentTick
missiles = append(missiles, FloatPoint{x + 32, y})
energy -= EnergyCostPerShot
shoot.Play(1)
}
}
}
game.StatusCallback = func() string {
return fmt.Sprintf("Energy: %3d Score: %d", int(energy), score)
}
game.MainLoop(renderer, font)
}
}
}
game.StatusCallback = func() string {
return fmt.Sprintf("Energy: %3d Score: %d", int(energy), score)
}
game.MainLoop(renderer, font)
}
type FloatPoint struct {
X, Y float64
}
var lastFire = sdl.GetTicks()
var shipPoints = [...]sdl.Point{sdl.Point{30, 0}, sdl.Point{-20, -15}, sdl.Point{-20, 15}}
func drawShip(r *sdl.Renderer) {
ship := make([]sdl.Point, 4)
for i := 0; i < 4; i++ {
p := shipPoints[i%3]
ship[i] = sdl.Point{p.X + int32(x), p.Y + int32(y)}
}
r.SetDrawColor(255, 255, 255, 255)
err := r.DrawLines(ship)
if err != 0 {
error("Draw error")
}
func main() {
var window *sdl.Window
var renderer *sdl.Renderer
var event sdl.Event
var running bool
window = sdl.CreateWindow(winTitle, sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED,
winWidth, winHeight, sdl.WINDOW_SHOWN)
if window == nil {
fmt.Fprintf(os.Stderr, "Failed to create window: %s\n", sdl.GetError())
os.Exit(1)
}
renderer = sdl.CreateRenderer(window, -1, sdl.RENDERER_ACCELERATED)
if renderer == nil {
fmt.Fprintf(os.Stderr, "Failed to create renderer: %s\n", sdl.GetError())
os.Exit(2)
}
running = true
lastPushTime := sdl.GetTicks()
for running {
// Push a UserEvent every second
if lastPushTime+pushTime < sdl.GetTicks() {
lastPushTime = sdl.GetTicks()
pEvent := &sdl.UserEvent{sdl.USEREVENT, sdl.GetTicks(), window.GetID(), 1331, nil, nil}
retVal := sdl.PushEvent(pEvent) // Here's where the event is actually pushed
switch retVal {
case 1:
fmt.Println("PushEvent returned success")
case 0:
fmt.Println("PushEvent returned filtered")
case -1:
fmt.Printf("PushEvent returned error: %s\n", sdl.GetError)
}
}
for event = sdl.PollEvent(); event != nil; event = sdl.PollEvent() {
switch t := event.(type) {
case *sdl.QuitEvent:
running = false
case *sdl.MouseMotionEvent:
fmt.Printf("[%d ms] MouseMotion\ttype:%d\tid:%d\tx:%d\ty:%d\txrel:%d\tyrel:%d\n",
t.Timestamp, t.Type, t.Which, t.X, t.Y, t.XRel, t.YRel)
case *sdl.MouseButtonEvent:
fmt.Printf("[%d ms] MouseButton\ttype:%d\tid:%d\tx:%d\ty:%d\tbutton:%d\tstate:%d\n",
t.Timestamp, t.Type, t.Which, t.X, t.Y, t.Button, t.State)
case *sdl.MouseWheelEvent:
fmt.Printf("[%d ms] MouseWheel\ttype:%d\tid:%d\tx:%d\ty:%d\n",
t.Timestamp, t.Type, t.Which, t.X, t.Y)
case *sdl.KeyUpEvent:
fmt.Printf("[%d ms] Keyboard\ttype:%d\tsym:%c\tmodifiers:%d\tstate:%d\trepeat:%d\n",
t.Timestamp, t.Type, t.Keysym.Sym, t.Keysym.Mod, t.State, t.Repeat)
case *sdl.UserEvent:
fmt.Printf("[%d ms] UserEvent\tcode:%d\n", t.Timestamp, t.Code)
}
}
sdl.Delay(1000 / 30)
}
renderer.Destroy()
window.Destroy()
}
func main() {
var window *sdl.Window
var renderer *sdl.Renderer
var event sdl.Event
var running bool
window = sdl.CreateWindow(winTitle, sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED,
winWidth, winHeight, sdl.WINDOW_SHOWN)
if window == nil {
fmt.Fprintf(os.Stderr, "Failed to create window: %s\n", sdl.GetError())
os.Exit(1)
}
renderer = sdl.CreateRenderer(window, -1, sdl.RENDERER_ACCELERATED)
if renderer == nil {
fmt.Fprintf(os.Stderr, "Failed to create renderer: %s\n", sdl.GetError())
os.Exit(2)
}
var peepArray []sdl.Event = make([]sdl.Event, 2)
peepArray[0] = &sdl.UserEvent{sdl.USEREVENT, sdl.GetTicks(), window.GetID(), 1331, nil, nil}
peepArray[1] = &sdl.UserEvent{sdl.USEREVENT, sdl.GetTicks(), window.GetID(), 10101, nil, nil}
running = true
lastPushTime := sdl.GetTicks()
for running {
if lastPushTime+pushTime < sdl.GetTicks() {
lastPushTime = sdl.GetTicks()
sdl.PumpEvents()
numEventsHandled := sdl.PeepEvents(peepArray, sdl.ADDEVENT, sdl.FIRSTEVENT, sdl.LASTEVENT)
if numEventsHandled < 0 {
fmt.Printf("PeepEvents error: %s\n", sdl.GetError())
} else {
fmt.Printf("Successful push of %d events\n", numEventsHandled)
}
}
for event = sdl.PollEvent(); event != nil; event = sdl.PollEvent() {
switch t := event.(type) {
case *sdl.QuitEvent:
running = false
case *sdl.MouseMotionEvent:
fmt.Printf("[%d ms] MouseMotion\ttype:%d\tid:%d\tx:%d\ty:%d\txrel:%d\tyrel:%d\n",
t.Timestamp, t.Type, t.Which, t.X, t.Y, t.XRel, t.YRel)
case *sdl.MouseButtonEvent:
fmt.Printf("[%d ms] MouseButton\ttype:%d\tid:%d\tx:%d\ty:%d\tbutton:%d\tstate:%d\n",
t.Timestamp, t.Type, t.Which, t.X, t.Y, t.Button, t.State)
case *sdl.MouseWheelEvent:
fmt.Printf("[%d ms] MouseWheel\ttype:%d\tid:%d\tx:%d\ty:%d\n",
t.Timestamp, t.Type, t.Which, t.X, t.Y)
case *sdl.KeyUpEvent:
fmt.Printf("[%d ms] Keyboard\ttype:%d\tsym:%c\tmodifiers:%d\tstate:%d\trepeat:%d\n",
t.Timestamp, t.Type, t.Keysym.Sym, t.Keysym.Mod, t.State, t.Repeat)
case *sdl.UserEvent:
fmt.Printf("[%d ms] UserEvent\tcode:%d\n", t.Timestamp, t.Code)
}
}
sdl.Delay(1000 / 30)
}
renderer.Destroy()
window.Destroy()
}