func (self *OpenGLWindow) Open() {
var err error
if !glfw.Init() {
panic(errors.New("Unable to initialize GLFW"))
}
glfw.SetErrorCallback(func(code glfw.ErrorCode, desc string) {
log.Printf("[GLFW Error] (%d) %s", code, desc)
})
var monitor *glfw.Monitor
if self.config.Fullscreen {
monitor, err = glfw.GetPrimaryMonitor()
if err != nil {
panic(err)
}
}
glfw.WindowHint(glfw.ContextVersionMajor, 4)
glfw.WindowHint(glfw.ContextVersionMinor, 1)
glfw.WindowHint(glfw.OpenglProfile, glfw.OpenglCoreProfile)
glfw.WindowHint(glfw.OpenglForwardCompatible, glfw.True)
// Default buffer sizes
glfw.WindowHint(glfw.DepthBits, 32)
glfw.WindowHint(glfw.StencilBits, 0)
// Toggle VSync. Turning VSync off aparently doesn't work via glfw through
// some ATI cards and drivers
if self.config.VSync {
glfw.SwapInterval(1)
} else {
glfw.SwapInterval(0)
}
self.window, err = glfw.CreateWindow(
int(self.config.Width), int(self.config.Height),
"Project Slartibartfast",
monitor,
nil)
if err != nil {
panic(err)
}
self.window.MakeContextCurrent()
if glewError := gl.Init(); glewError != 0 {
panic(errors.New("Unable to initialize OpenGL"))
}
}
func main() {
glfw.SetErrorCallback(errorCallback)
if !glfw.Init() {
panic("Can't init glfw!")
}
defer glfw.Terminate()
window, err := glfw.CreateWindow(800, 640, "MyGui", nil, nil)
if err != nil {
panic(err)
}
window.MakeContextCurrent()
glfw.SwapInterval(1)
gl.Init()
mvp := prepareModelViewProjection(800, 640)
prepareScene()
dt := float64(0)
glfw.SetTime(dt)
for !window.ShouldClose() {
dt = glfw.GetTime()
glfw.SetTime(0)
updateScene(dt)
drawScene(mvp, dt)
window.SwapBuffers()
glfw.PollEvents()
}
}
func main() {
if !glfw.Init() {
log.Fatal("glfw failed to initialize")
}
defer glfw.Terminate()
window, err := glfw.CreateWindow(640, 480, "Deformable", nil, nil)
if err != nil {
log.Fatal(err.Error())
}
window.MakeContextCurrent()
glfw.SwapInterval(1)
window.SetMouseButtonCallback(handleMouseButton)
window.SetKeyCallback(handleKeyDown)
window.SetInputMode(glfw.Cursor, glfw.CursorHidden)
gl.Init()
initGL()
i := 16
m = GenerateMap(1600/i, 1200/i, i)
for running && !window.ShouldClose() {
x, y := window.GetCursorPosition()
if drawing != 0 {
m.Add(int(x)+int(camera[0]), int(y)+int(camera[1]), drawing, brushSizes[currentBrushSize])
}
gl.Clear(gl.COLOR_BUFFER_BIT)
gl.LoadIdentity()
gl.PushMatrix()
gl.PushAttrib(gl.CURRENT_BIT | gl.ENABLE_BIT | gl.LIGHTING_BIT | gl.POLYGON_BIT | gl.LINE_BIT)
gl.Translatef(-camera[0], -camera[1], 0)
m.Draw()
gl.PopAttrib()
gl.PopMatrix()
gl.PushAttrib(gl.COLOR_BUFFER_BIT)
gl.LineWidth(2)
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.ONE_MINUS_DST_COLOR, gl.ZERO)
// gl.Enable(gl.LINE_SMOOTH)
// gl.Hint(gl.LINE_SMOOTH_HINT, gl.NICEST)
gl.Translatef(float32(x), float32(y), 0)
gl.EnableClientState(gl.VERTEX_ARRAY)
gl.VertexPointer(2, gl.DOUBLE, 0, cursorVerts)
gl.DrawArrays(gl.LINE_LOOP, 0, 24)
gl.PopAttrib()
window.SwapBuffers()
glfw.PollEvents()
}
}
func main() {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
defer glfw.Terminate()
mandala.Verbose = true
if !glfw.Init() {
panic("Can't init glfw!")
}
// Enable OpenGL ES 2.0.
glfw.WindowHint(glfw.ClientApi, glfw.OpenglEsApi)
glfw.WindowHint(glfw.ContextVersionMajor, 2)
window, err := glfw.CreateWindow(Width, Height, "gltext black-box testing", nil, nil)
if err != nil {
panic(err)
}
glfw.SwapInterval(0)
mandala.Init(window)
go prettytest.Run(new(testing.T), testlib.NewTestSuite(outputPath))
for !window.ShouldClose() {
glfw.WaitEvents()
}
}
func main() {
glfw.SetErrorCallback(errorCallback)
if !glfw.Init() {
panic("Can't init glfw!")
}
defer glfw.Terminate()
window, err := glfw.CreateWindow(Width, Height, Title, nil, nil)
if err != nil {
panic(err)
}
window.MakeContextCurrent()
glfw.SwapInterval(1)
gl.Init()
if err := initScene(); err != nil {
fmt.Fprintf(os.Stderr, "init: %s\n", err)
return
}
defer destroyScene()
for !window.ShouldClose() {
drawScene()
window.SwapBuffers()
glfw.PollEvents()
}
}
func main() {
glfw.SetErrorCallback(glfwError)
if !glfw.Init() {
log.Printf("Unable to initializer glfw")
return
}
defer glfw.Terminate()
window, err := glfw.CreateWindow(Width, Height, Title, nil, nil)
if err != nil {
panic(err)
}
window.MakeContextCurrent()
window.SetSizeCallback(fixProjection)
err = initGL()
if err != nil {
log.Printf("Error initializing OpenGL. %v", err)
panic(err)
}
glfw.SwapInterval(1)
fixProjection(window, Width, Height)
meshBuff := createMeshBuffer()
for !window.ShouldClose() {
timeDelta.Tick()
log.Printf("Time: %v", timeDelta.Delta)
window.SwapBuffers()
glfw.PollEvents()
}
}
func NewTestbed(title string) *Testbed {
t := new(Testbed)
t.window = OpenWindow(500, 500, title)
glfw.SwapInterval(1)
t.image = LoadPNG("testimage.png").(*image.NRGBA)
return t
}
func main() {
runtime.LockOSThread()
glfw.SetErrorCallback(errorCallback)
if !glfw.Init() {
panic("Can't init glfw!")
}
defer glfw.Terminate()
// must be done in main thread or we get a nasty stderr message from glfw,
// although it does seem to 'work'
window, err := glfw.CreateWindow(Width, Height, Title, nil, nil)
if err != nil {
panic(err)
}
// separate thread for drawing so that we don't block on the event thread.
// most obvious benefit is that we continue to render during window
// resizes.
go func() {
runtime.LockOSThread()
window.MakeContextCurrent()
glfw.SwapInterval(1)
gl.Init()
if err := initScene(); err != nil {
fmt.Fprintf(os.Stderr, "init: %s\n", err)
return
}
for !window.ShouldClose() {
drawScene()
window.SwapBuffers()
}
os.Exit(0)
}()
for {
glfw.WaitEvents()
}
}
func main() {
if !glfw.Init() {
f.Println("Failed to init glfw")
panic("Cannot initialize glfw library")
}
defer glfw.Terminate()
//glfw.WindowHint(glfw.DepthBits, 16)
window, err := glfw.CreateWindow(300, 300, "Wander", nil, nil)
if err != nil {
panic(err)
}
window.SetFramebufferSizeCallback(reshape)
window.SetKeyCallback(key)
window.MakeContextCurrent()
glfw.SwapInterval(1)
width, height := window.GetFramebufferSize()
reshape(window, width, height)
if gl.Init() != 0 {
panic("Failed to init GL")
}
prog := setupProgram()
defer prog.Delete()
prog.Use()
attr = prog.GetAttribLocation("offset")
setup()
for !window.ShouldClose() {
if shouldRender() {
draw()
}
animate()
window.SwapBuffers()
glfw.PollEvents()
}
}
func main() {
// initialize glfw
if !glfw.Init() {
panic("Failed to initialize GLFW")
}
defer glfw.Terminate()
// create window
window, err := glfw.CreateWindow(600, 600, os.Args[0], nil, nil)
if err != nil {
panic(err)
}
window.SetFramebufferSizeCallback(onResize)
window.MakeContextCurrent()
// set up opengl context
onResize(window, 600, 600)
// set up physics
createBodies()
runtime.LockOSThread()
glfw.SwapInterval(1)
ticksToNextBall := 10
ticker := time.NewTicker(time.Second / 60)
for !window.ShouldClose() {
ticksToNextBall--
if ticksToNextBall == 0 {
ticksToNextBall = rand.Intn(100) + 1
addBall()
}
draw()
step(1.0 / 60.0)
window.SwapBuffers()
glfw.PollEvents()
<-ticker.C // wait up to 1/60th of a second
}
}
func main() {
if !glfw.Init() {
panic("Failed to initialize GLFW")
}
defer glfw.Terminate()
glfw.WindowHint(glfw.DepthBits, 16)
window, err := glfw.CreateWindow(300, 300, "Gears", nil, nil)
if err != nil {
panic(err)
}
// Set callback functions
window.SetFramebufferSizeCallback(reshape)
window.SetKeyCallback(key)
window.MakeContextCurrent()
glfw.SwapInterval(1)
width, height := window.GetFramebufferSize()
reshape(window, width, height)
// Parse command-line options
Init()
// Main loop
for !window.ShouldClose() {
// Draw gears
draw()
// Update animation
animate()
// Swap buffers
window.SwapBuffers()
glfw.PollEvents()
}
}
func main() {
flag.Parse()
glfw.SetErrorCallback(errorCallback)
if !glfw.Init() {
println("glfw init failure")
}
defer glfw.Terminate()
glfw.WindowHint(glfw.ClientApi, glfw.OpenglEsApi)
glfw.WindowHint(glfw.ContextVersionMajor, 2)
glfw.WindowHint(glfw.ContextVersionMinor, 0)
window, err := glfw.CreateWindow(Width, Height, Title, nil, nil)
if err != nil {
panic(err)
}
defer window.Destroy()
window.MakeContextCurrent()
glfw.SwapInterval(1)
window.SetSizeCallback(reshape)
window.SetKeyCallback(keyEvent)
gl.Viewport(0, 0, Width, Height)
initScene()
if *debug {
go func() {
tick := time.Tick(1 * time.Second)
for {
<-tick
fmt.Printf("FPS:%v\tGOROUTINE:%v\r", atomic.LoadUint64(fps), runtime.NumGoroutine())
atomic.StoreUint64(fps, 0)
}
}()
}
for !window.ShouldClose() {
drawScene()
window.SwapBuffers()
glfw.PollEvents()
atomic.AddUint64(fps, 1)
}
}
func main() {
glfw.SetErrorCallback(errorCallback)
if !glfw.Init() {
panic("Can't init glfw!")
}
defer glfw.Terminate()
glfw.WindowHint(glfw.DepthBits, 16)
window, err := glfw.CreateWindow(Width, Height, Title, nil, nil)
if err != nil {
panic(err)
}
window.SetFramebufferSizeCallback(reshape)
window.SetKeyCallback(key)
window.MakeContextCurrent()
glfw.SwapInterval(1000 / 60)
width, height := window.GetFramebufferSize()
reshape(window, width, height)
if err := initGL(); err != nil {
fmt.Fprintf(os.Stderr, "init: %s\n", err)
return
}
defer destroyGL()
for !window.ShouldClose() {
drawScene()
window.SwapBuffers()
glfw.PollEvents()
}
}
func main() {
f, err := os.Create("Go.pprof") // Create file for profiling
if err != nil {
panic(err)
}
glfw.SetErrorCallback(errorCallback)
if !glfw.Init() {
panic("Can't init glfw!")
}
defer glfw.Terminate()
glfw.WindowHint(glfw.Samples, 2)
glfw.WindowHint(glfw.ContextVersionMajor, 2)
glfw.WindowHint(glfw.ContextVersionMinor, 1)
window, err := glfw.CreateWindow(Width, Height, Title, nil, nil)
if err != nil {
panic(err)
}
window.MakeContextCurrent()
glfw.SwapInterval(0) // No limit on FPS
gl.Init()
initScene()
loadCubeToGPU()
for !window.ShouldClose() {
frameInitT = time.Now()
movPts(frameDur)
doWind()
if spwnTmr >= SpawnInterval {
spwnPts(SpawnInterval)
spwnTmr -= SpawnInterval
}
if cleanupTmr >= float64(MaxLife)/1000 {
cleanupPtPool()
cleanupTmr = 0
}
checkColls()
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
gpuInitT = time.Now()
renderPts()
window.SwapBuffers()
gpuEndT = time.Now()
glfw.PollEvents()
frameEndT = time.Now()
frameDur = frameEndT.Sub(frameInitT).Seconds() // Calculate the length of the previous frame
spwnTmr += frameDur
cleanupTmr += frameDur
runTmr += frameDur
if runTmr > MaxLife/1000 { // Start collecting framerate data and profiling after a full MaxLife worth of particles have been spawned
frames[curFrame] = frameDur
gpuTimes[curFrame] = gpuEndT.Sub(gpuInitT).Seconds()
curFrame += 1
pprof.StartCPUProfile(f)
}
if runTmr >= RunningTime { // Animation complete; calculate framerate mean and standard deviation
pprof.StopCPUProfile()
var sum float64
var i uint64
for i = 0; i < curFrame; i++ {
sum += frames[i]
}
frameTimeMean := sum / float64(curFrame)
fmt.Println("Average framerate was:", 1/frameTimeMean, "frames per second.")
sum = 0
for i = 0; i < curFrame; i++ {
sum += gpuTimes[i]
}
gpuTimeMean := sum / float64(curFrame)
fmt.Println("Average cpu time was-", frameTimeMean-gpuTimeMean, "seconds per frame.")
sumDiffs := 0.0
for i = 0; i < curFrame; i++ {
sumDiffs += math.Pow(1/frames[i]-1/frameTimeMean, 2)
}
variance := sumDiffs / float64(curFrame)
sd := math.Sqrt(variance)
fmt.Println("The standard deviation was:", sd, "frames per second.")
if PrintFrames == true {
fmt.Print("--:")
for i = 0; i < curFrame; i++ {
fmt.Print(1 / frames[i])
fmt.Print(",")
}
fmt.Print(".--")
}
break
}
}
gl.DisableClientState(gl.NORMAL_ARRAY)
gl.DisableClientState(gl.VERTEX_ARRAY)
}
// NewWindow creates a new window for the given dimensions and title.
// The window is created via GLFW.
func NewWindow(settings WindowSettings) (*Window, error) {
// Error callback
glfw.SetErrorCallback(errorCallback)
// Init glfw
logger.Debug("Initializing GLFW")
if !glfw.Init() {
return nil, errors.New("Could not initialise GLFW.")
}
glfw.WindowHint(glfw.Samples, 4)
glfw.WindowHint(glfw.ContextVersionMajor, 3)
glfw.WindowHint(glfw.ContextVersionMinor, 3)
glfw.WindowHint(glfw.OpenglForwardCompatible, glfw.True)
glfw.WindowHint(glfw.OpenglProfile, glfw.OpenglCoreProfile)
glfw.WindowHint(glfw.OpenglDebugContext, 1)
var monitor *glfw.Monitor
var err error
if settings.Fullscreen {
logger.Debug("Get primary monitor to create fullscreen window.")
monitor, err = glfw.GetPrimaryMonitor()
if err != nil {
return nil, err
}
logger.Debug("Checking available video modes:")
videoModes, err := monitor.GetVideoModes()
if err != nil {
return nil, err
}
for _, videoMode := range videoModes {
logger.Debug(fmt.Sprintf("-- %+v", videoMode))
}
idealVideoMode := videoModes[len(videoModes)-1]
settings.Width = idealVideoMode.Width
settings.Height = idealVideoMode.Height
}
// Create window
logger.Info("Creating new window")
window, err := glfw.CreateWindow(settings.Width, settings.Height, settings.Title, monitor, nil)
if err != nil {
return nil, err
}
window.SetKeyCallback(keyCallback)
window.MakeContextCurrent()
window.SetInputMode(glfw.StickyKeys, 1)
// Use vsync
glfw.SwapInterval(1)
w := &Window{
window: window,
Settings: settings,
}
currentWindow = w
return w, nil
}
func (me *context) SetSwapInterval(interval int) {
glfw.SwapInterval(interval)
}
// Starts a game loop.
// If error == nil everything went well, otherwise a fatal error occured
func Gameloop(g Game, width, height, tickrate int, glfwHints map[glfw.Hint]int) (err error) {
// Disable GC
debug.SetGCPercent(-1)
// Make sure this function/goroutine keeps running on the current OS thread
runtime.LockOSThread()
// Calculate tick delay
nanosPerTick := int64(NANOS_PER_SECOND / tickrate)
// Variables for statistics
ticks := 0
frames := 0
// Initialize game
g.Init()
defer g.Cleanup()
// Setup window
glfw.SetErrorCallback(g.HandleGlfwError)
if !glfw.Init() {
err = errors.New("gogame: glfw failed to initialize")
return
}
defer glfw.Terminate()
for target, hint := range glfwHints {
glfw.WindowHint(target, hint)
}
window, err := glfw.CreateWindow(width, height, "GoGame", nil, nil)
if err != nil {
// Just to be verbose
err = err
return
}
// Set callbacks
window.SetFramebufferSizeCallback(g.HandleReshape)
window.SetKeyCallback(g.HandleKey)
window.MakeContextCurrent()
// TODO: Investigate double buffering/vsync
glfw.SwapInterval(1)
if gl.Init() != 0 { // GLEW_OK
err = errors.New("gogame: error initializing opengl/glew")
return
}
// Manually reshape window
width, height = window.GetFramebufferSize()
g.HandleReshape(window, width, height)
// Let the game initialize its graphics
g.InitGL()
defer g.CleanupGL()
last_out := time.Now().UnixNano()
previous := time.Now().UnixNano()
unprocessed := int64(0)
for !window.ShouldClose() {
current := time.Now().UnixNano()
elapsed := current - previous
previous = current
unprocessed += elapsed
for unprocessed >= nanosPerTick {
if g.OnUpdate() {
window.SetShouldClose(true)
}
ticks++
unprocessed -= nanosPerTick
}
if true {
substep := float32(unprocessed) / float32(nanosPerTick)
g.OnRender(substep)
frames++
}
if current-last_out >= NANOS_PER_SECOND {
// TODO: Pass tps and fps to game instead of logging here
log.Printf("%d TPS, %d FPS", ticks, frames)
ticks = 0
frames = 0
last_out += NANOS_PER_SECOND
}
// Manually call GC
runtime.GC()
// Swap buffers
window.SwapBuffers()
glfw.PollEvents()
// TODO: Look into handling sleeping between frames
/*elapsed_time := time.Duration(time.Now().UnixNano()) - previous
sleep_time := NANOS_PER_FRAME - elapsed_time // TODO: Decrease sleep time?
if sleep_time >= SLEEP_THRESHOLD {
time.Sleep(sleep_time)
}*/
}
err = nil
return
}
func CreateWindow(width, height int, name string, fullscreen bool, delegate WindowDelegate, legacy bool) error {
if !glfw.Init() {
return errors.New("Failed to initialize GLFW")
}
defer glfw.Terminate()
glfw.WindowHint(glfw.DepthBits, 16)
if !legacy {
glfw.WindowHint(glfw.ContextVersionMajor, 3)
glfw.WindowHint(glfw.ContextVersionMinor, 2)
glfw.WindowHint(glfw.OpenglProfile, glfw.OpenglCoreProfile)
glfw.WindowHint(glfw.OpenglForwardCompatible, 1)
}
var monitor *glfw.Monitor = nil
var err error = nil
if fullscreen {
monitor, err = glfw.GetPrimaryMonitor()
if err != nil {
return err
}
vidModes, _ := monitor.GetVideoModes()
maxResolution := vidModes[len(vidModes)-1]
width = maxResolution.Width
height = maxResolution.Height
}
window, err := glfw.CreateWindow(width, height, name, monitor, nil)
if err != nil {
return err
}
if fullscreen {
window.SetInputMode(glfw.Cursor, glfw.CursorDisabled)
}
start := time.Now()
last := start
doSimulation := func() {
now := time.Now()
gameTime := GameTime{
now,
now.Sub(start),
now.Sub(last),
}
delegate.Simulate(gameTime)
last = now
}
bindEvents(window, &IdleSimulatorWindowDelegator{
WindowDelegator{delegate},
doSimulation,
})
window.MakeContextCurrent()
glfw.SwapInterval(1)
delegate.Init(window)
frameWidth, frameHeight := window.GetFramebufferSize()
delegate.Reshape(window, frameWidth, frameHeight)
for !window.ShouldClose() {
doSimulation()
if delegate.NeedsRender() {
delegate.Draw(window)
}
window.SwapBuffers()
if delegate.IsIdle() {
glfw.WaitEvents()
} else {
glfw.PollEvents()
}
}
return nil
}
