func main() {
// Initialize GLFW for window management
glfw.SetErrorCallback(glfwErrorCallback)
if !glfw.Init() {
panic("failed to initialize glfw")
}
defer glfw.Terminate()
glfw.WindowHint(glfw.Resizable, glfw.False)
glfw.WindowHint(glfw.ContextVersionMajor, 3)
glfw.WindowHint(glfw.ContextVersionMinor, 3)
glfw.WindowHint(glfw.OpenglForwardCompatible, glfw.True) // Necessary for OS X
glfw.WindowHint(glfw.OpenglProfile, glfw.OpenglCoreProfile) // Necessary for OS X
glfw.WindowHint(glfw.OpenglDebugContext, glfw.True)
window, err := glfw.CreateWindow(WindowWidth, WindowHeight, "Cube", nil, nil)
if err != nil {
panic(err)
}
window.MakeContextCurrent()
// Initialize Glow
if err := gl.Init(); err != nil {
panic(err)
}
// Note that it is possible to use GL functions spanning multiple versions
if err := gl4.Init(); err != nil {
fmt.Printf("Could not initialize GL 4.4 (non-fatal)")
}
if gl.ARB_debug_output {
gl.Enable(gl.DEBUG_OUTPUT_SYNCHRONOUS_ARB)
gl.DebugMessageCallbackARB(gl.DebugProc(glDebugCallback), gl.Ptr(nil))
// Trigger an error to demonstrate debug output
gl.Enable(gl.CONTEXT_FLAGS)
}
version := gl.GoStr(gl.GetString(gl.VERSION))
fmt.Println("OpenGL version", version)
// Configure the vertex and fragment shaders
program, err := newProgram(vertexShader, fragmentShader)
if err != nil {
panic(err)
}
gl.UseProgram(program)
projection := mgl32.Perspective(70.0, float32(WindowWidth)/WindowHeight, 0.1, 10.0)
projectionUniform := gl.GetUniformLocation(program, gl.Str("projection\x00"))
gl.UniformMatrix4fv(projectionUniform, 1, false, &projection[0])
camera := mgl32.LookAtV(mgl32.Vec3{3, 3, 3}, mgl32.Vec3{0, 0, 0}, mgl32.Vec3{0, 1, 0})
cameraUniform := gl.GetUniformLocation(program, gl.Str("camera\x00"))
gl.UniformMatrix4fv(cameraUniform, 1, false, &camera[0])
model := mgl32.Ident4()
modelUniform := gl.GetUniformLocation(program, gl.Str("model\x00"))
gl.UniformMatrix4fv(modelUniform, 1, false, &model[0])
textureUniform := gl.GetUniformLocation(program, gl.Str("tex\x00"))
gl.Uniform1i(textureUniform, 0)
gl.BindFragDataLocation(program, 0, gl.Str("outputColor\x00"))
// Load the texture
texture, err := newTexture("square.png")
if err != nil {
panic(err)
}
// Configure the vertex data
var vao uint32
gl.GenVertexArrays(1, &vao)
gl.BindVertexArray(vao)
var vbo uint32
gl.GenBuffers(1, &vbo)
gl.BindBuffer(gl.ARRAY_BUFFER, vbo)
gl.BufferData(gl.ARRAY_BUFFER, len(cubeVertices)*4, gl.Ptr(cubeVertices), gl.STATIC_DRAW)
vertAttrib := uint32(gl.GetAttribLocation(program, gl.Str("vert\x00")))
gl.EnableVertexAttribArray(vertAttrib)
gl.VertexAttribPointer(vertAttrib, 3, gl.FLOAT, false, 5*4, gl.PtrOffset(0))
texCoordAttrib := uint32(gl.GetAttribLocation(program, gl.Str("vertTexCoord\x00")))
gl.EnableVertexAttribArray(texCoordAttrib)
gl.VertexAttribPointer(texCoordAttrib, 2, gl.FLOAT, false, 5*4, gl.PtrOffset(3*4))
// Configure global settings
gl.Enable(gl.DEPTH_TEST)
gl.DepthFunc(gl.LESS)
gl.ClearColor(1.0, 1.0, 1.0, 1.0)
angle := 0.0
previousTime := glfw.GetTime()
for !window.ShouldClose() {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
// Update
time := glfw.GetTime()
elapsed := time - previousTime
previousTime = time
angle += elapsed
model = mgl32.HomogRotate3D(float32(angle), mgl32.Vec3{0, 1, 0})
// Render
gl.UseProgram(program)
gl.UniformMatrix4fv(modelUniform, 1, false, &model[0])
gl.BindVertexArray(vao)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, texture)
gl.DrawArrays(gl.TRIANGLES, 0, 6*2*3)
// Maintenance
window.SwapBuffers()
glfw.PollEvents()
}
}
func (self *OpenGLWindow) TimeSinceLast() float32 {
if self.timeLastCall == 0 {
self.timeLastCall = glfw.GetTime()
}
now := glfw.GetTime()
diff := now - self.timeLastCall
self.timeLastCall = now
return float32(diff)
}
func (ship *Ship) shoot() {
if ship.shooting && glfw.GetTime() > ship.lastBulletFired+(1/ship.bulletsPerSecond) && ship.IsAlive() {
var rad float64 = ((ship.Angle) * math.Pi) / 180
x, y := RotateVector(&Vector{0, 5}, ship.Angle)
bullet := NewBullet(
ship.PosX+x,
ship.PosY+y,
ship.MaxVelocity*math.Sin(rad)*2,
ship.MaxVelocity*math.Cos(rad)*2,
)
bullets = append(bullets, bullet)
ship.lastBulletFired = glfw.GetTime()
}
}
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 (torpedo *Torpedo) Update() {
if paused {
timediff := (glfw.GetTime() - torpedo.Entity.lastUpdatedTime)
torpedo.MaxLifetime = torpedo.MaxLifetime + timediff
}
torpedo.Entity.Update()
}
func (bullet *Bullet) Update() {
if paused {
timediff := (glfw.GetTime() - bullet.Entity.lastUpdatedTime)
bullet.MaxLifetime = bullet.MaxLifetime + timediff
}
bullet.Entity.Update()
}
func (explosion *Explosion) Update() {
if paused {
timediff := (glfw.GetTime() - explosion.Entity.lastUpdatedTime)
explosion.MaxLifetime = explosion.MaxLifetime + timediff
}
explosion.Entity.Update()
for l, _ := range explosion.Lines {
explosion.Lines[l].Update()
}
}
func NewEntity(shape Polygon, x, y, angle, turnrate, vX, vY, accel, maxvel float64) *Entity {
return &Entity{
Shape: shape,
PosX: x,
PosY: y,
Angle: angle,
TurnRate: turnrate,
VelocityX: vX,
VelocityY: vY,
AccelerationRate: accel,
MaxVelocity: maxvel,
rotateLeft: false,
rotateRight: false,
accelerate: false,
decelerate: false,
isAlive: true,
createdTime: glfw.GetTime(),
lastUpdatedTime: glfw.GetTime(),
}
}
func main() {
initGlfw()
defer terminateGlfw()
window := createWindow(int(width), int(height))
game := NewGame(window)
profiler := NewProfiler(game.text)
defer game.delete()
previousFrameTime := glfw.GetTime()
profiler.start()
for !window.ShouldClose() {
now := glfw.GetTime()
elapsed := now - previousFrameTime
previousFrameTime = now
game.update(elapsed)
game.render()
profiler.update()
profiler.render()
window.SwapBuffers()
glfw.PollEvents()
}
}
func (explosion *BigExplosion) Update() {
timediff := (glfw.GetTime() - explosion.Entity.lastUpdatedTime)
if paused {
explosion.MaxLifetime = explosion.MaxLifetime + timediff
} else {
addSize := 50 * timediff
for v := range explosion.Entity.Shape.Vectors {
explosion.Entity.Shape.Vectors[v].X = explosion.Entity.Shape.Vectors[v].X / explosion.Size * (explosion.Size + addSize)
explosion.Entity.Shape.Vectors[v].Y = explosion.Entity.Shape.Vectors[v].Y / explosion.Size * (explosion.Size + addSize)
}
explosion.Size += addSize
}
explosion.Entity.Update()
}
func (this *Profiler) update() {
frameCount := len(this.frameTimes)
now := glfw.GetTime()
this.frameTimes[this.frame%frameCount] = now - this.lastTime
movingAverage := 0.0
for _, f := range this.frameTimes {
movingAverage += f
}
movingAverage /= float64(frameCount)
if this.frame%frameCount == 0 {
this.frameSpeed = movingAverage
}
this.lastTime = now
this.frame++
}
func (me *context) Time() float64 {
return glfw.GetTime()
}
func (this *Profiler) start() {
this.lastTime = glfw.GetTime()
}
func (explosion *BigExplosion) IsAlive() bool {
if glfw.GetTime() > explosion.createdTime+explosion.MaxLifetime {
return false
}
return explosion.Entity.IsAlive()
}
func (ent *Entity) Update() {
if paused {
ent.lastUpdatedTime = glfw.GetTime()
} else {
timediff := (glfw.GetTime() - ent.lastUpdatedTime) * 500
ent.lastUpdatedTime = glfw.GetTime()
var rad float64 = ((ent.Angle) * math.Pi) / 180
// rotation
if ent.rotateLeft {
ent.Angle = ent.Angle - (ent.TurnRate * timediff)
if ent.Angle < 0 {
ent.Angle += 360
}
} else if ent.rotateRight {
ent.Angle = ent.Angle + (ent.TurnRate * timediff)
if ent.Angle > 360 {
ent.Angle -= 360
}
}
/*
0° Sin(0), Cos(1)
90° Sin(1), Cos(0)
180° Sin(0), Cos(-1)
270° Sin(-1), Cos(0)
*/
if ent.accelerate {
ent.VelocityX = ent.VelocityX + (ent.AccelerationRate * math.Sin(rad))
ent.VelocityY = ent.VelocityY + (ent.AccelerationRate * math.Cos(rad))
} else if ent.decelerate {
ent.VelocityX = ent.VelocityX - (ent.AccelerationRate * math.Sin(rad))
ent.VelocityY = ent.VelocityY - (ent.AccelerationRate * math.Cos(rad))
}
// max velocity
totalVelocity := math.Sqrt(ent.VelocityX*ent.VelocityX + ent.VelocityY*ent.VelocityY)
if totalVelocity > ent.MaxVelocity {
ent.VelocityX = ent.VelocityX / totalVelocity
ent.VelocityY = ent.VelocityY / totalVelocity
ent.VelocityX = ent.VelocityX * ent.MaxVelocity
ent.VelocityY = ent.VelocityY * ent.MaxVelocity
}
// move
ent.PosX = ent.VelocityX*timediff + ent.PosX
ent.PosY = ent.VelocityY*timediff + ent.PosY
// crude zone clipping
// TODO: for now it works, but needs to be updated for seamless clipping..
if ent.PosX > gameWidth {
ent.PosX -= gameWidth
} else if ent.PosX < 0 {
ent.PosX += gameWidth
}
if ent.PosY > gameHeight {
ent.PosY -= gameHeight
} else if ent.PosY < 0 {
ent.PosY += gameHeight
}
}
}
func (a *Application) update() {
a.Width, a.Height = a.window.GetSize()
now := float32(glfw.GetTime())
a.DeltaTime = now - a.Time
a.Time = now
}
// GetTime returns the number of seconds since the timer was started.
//
// Please refer to http://www.glfw.org/docs/latest/input.html#time for more
// information.
func GetTime() float64 {
return glfw.GetTime()
}
func (torpedo *Torpedo) IsAlive() bool {
if glfw.GetTime() > torpedo.createdTime+torpedo.MaxLifetime {
torpedo.Destroy()
}
return torpedo.Entity.IsAlive()
}
// update animation parameters
func animate() {
angle = 100.0 * glfw.GetTime()
}
func main() {
runtime.LockOSThread()
if !glfw.Init() {
fmt.Fprintf(os.Stderr, "Can't open GLFW")
return
}
defer glfw.Terminate()
glfw.WindowHint(glfw.Samples, 4)
glfw.WindowHint(glfw.ContextVersionMajor, 3)
glfw.WindowHint(glfw.ContextVersionMinor, 3)
glfw.WindowHint(glfw.OpenglProfile, glfw.OpenglCoreProfile)
glfw.WindowHint(glfw.OpenglForwardCompatible, glfw.True) // needed for macs
window, err := glfw.CreateWindow(1024, 768, "Tutorial 8", nil, nil)
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
return
}
window.MakeContextCurrent()
gl.Init()
gl.GetError() // Ignore error
window.SetInputMode(glfw.StickyKeys, 1)
window.SetCursorPosition(1024/2, 768/2)
window.SetInputMode(glfw.Cursor, glfw.CursorHidden)
gl.ClearColor(0., 0., 0.4, 0.)
gl.Enable(gl.DEPTH_TEST)
gl.DepthFunc(gl.LESS)
gl.Enable(gl.CULL_FACE)
camera := input.NewCamera(window)
vertexArray := gl.GenVertexArray()
defer vertexArray.Delete()
vertexArray.Bind()
prog := helper.MakeProgram("StandardShading.vertexshader", "StandardShading.fragmentshader")
defer prog.Delete()
matrixID := prog.GetUniformLocation("MVP")
viewMatrixID := prog.GetUniformLocation("V")
modelMatrixID := prog.GetUniformLocation("M")
texture, err := helper.TextureFromDDS("uvmap.DDS")
if err != nil {
fmt.Printf("Could not load texture: %v\n", err)
}
defer texture.Delete()
texSampler := prog.GetUniformLocation("myTextureSampler")
meshObj := objloader.LoadObject("suzanne.obj", true)
indices, indexedVertices, indexedUVs, indexedNormals := indexer.IndexVBOSlow(meshObj.Vertices, meshObj.UVs, meshObj.Normals)
vertexBuffer := gl.GenBuffer()
defer vertexBuffer.Delete()
vertexBuffer.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, len(indexedVertices)*3*4, indexedVertices, gl.STATIC_DRAW)
uvBuffer := gl.GenBuffer()
defer uvBuffer.Delete()
uvBuffer.Bind(gl.ARRAY_BUFFER)
// And yet, the weird length stuff doesn't seem to matter for UV or normal
gl.BufferData(gl.ARRAY_BUFFER, len(indexedUVs)*2*4, indexedUVs, gl.STATIC_DRAW)
normBuffer := gl.GenBuffer()
defer normBuffer.Delete()
normBuffer.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, len(indexedNormals)*3*4, indexedNormals, gl.STATIC_DRAW)
elementBuffer := gl.GenBuffer()
defer elementBuffer.Delete()
elementBuffer.Bind(gl.ELEMENT_ARRAY_BUFFER)
gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, len(indices)*2, indices, gl.STATIC_DRAW) // NOTE: a GL_UNSIGNED_SHORT is 16-bits
lightID := prog.GetUniformLocation("LightPosition_worldspace")
lastTime := glfw.GetTime()
nbFrames := 0
// Equivalent to a do... while
for ok := true; ok; ok = (window.GetKey(glfw.KeyEscape) != glfw.Press && !window.ShouldClose()) {
currTime := glfw.GetTime()
nbFrames++
if currTime-lastTime >= 1.0 {
fmt.Printf("%f ms/frame\n", 1000.0/float64(nbFrames))
nbFrames = 0
lastTime += 1.0
}
func() {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
prog.Use()
defer gl.ProgramUnuse()
view, proj := camera.ComputeViewPerspective()
model := mgl32.Ident4()
MVP := proj.Mul4(view).Mul4(model)
//mvpArray := mvp.AsCMOArray(mathgl.FLOAT32).([16]float32)
//vArray := view.AsCMOArray(mathgl.FLOAT32).([16]float32)
//mArray := model.AsCMOArray(mathgl.FLOAT32).([16]float32)
matrixID.UniformMatrix4fv(false, MVP)
viewMatrixID.UniformMatrix4fv(false, view)
modelMatrixID.UniformMatrix4fv(false, model)
lightID.Uniform3f(4., 4., 4.)
gl.ActiveTexture(gl.TEXTURE0)
texture.Bind(gl.TEXTURE_2D)
defer texture.Unbind(gl.TEXTURE_2D)
texSampler.Uniform1i(0)
vertexAttrib := gl.AttribLocation(0)
vertexAttrib.EnableArray()
defer vertexAttrib.DisableArray()
vertexBuffer.Bind(gl.ARRAY_BUFFER)
defer vertexBuffer.Unbind(gl.ARRAY_BUFFER)
vertexAttrib.AttribPointer(3, gl.FLOAT, false, 0, nil)
uvAttrib := gl.AttribLocation(1)
uvAttrib.EnableArray()
defer uvAttrib.DisableArray()
uvBuffer.Bind(gl.ARRAY_BUFFER)
defer uvBuffer.Unbind(gl.ARRAY_BUFFER)
uvAttrib.AttribPointer(2, gl.FLOAT, false, 0, nil)
normAttrib := gl.AttribLocation(2)
normAttrib.EnableArray()
defer normAttrib.DisableArray()
normBuffer.Bind(gl.ARRAY_BUFFER)
defer normBuffer.Unbind(gl.ARRAY_BUFFER)
normAttrib.AttribPointer(3, gl.FLOAT, false, 0, nil)
elementBuffer.Bind(gl.ELEMENT_ARRAY_BUFFER)
defer elementBuffer.Unbind(gl.ELEMENT_ARRAY_BUFFER)
gl.DrawElements(gl.TRIANGLES, len(indices), gl.UNSIGNED_SHORT, nil)
window.SwapBuffers()
glfw.PollEvents()
}() // Defers unbinds and disables to here, end of the loop
}
}
// Since go has multiple return values, I just went ahead and made it return the view and perspective matrices (in that order) rather than messing with getter methods
func (c *Camera) ComputeViewPerspective() (mgl32.Mat4, mgl32.Mat4) {
if mgl64.FloatEqual(-1.0, c.time) {
c.time = glfw.GetTime()
}
currTime := glfw.GetTime()
deltaT := currTime - c.time
xPos, yPos := c.window.GetCursorPosition()
c.window.SetCursorPosition(width/2.0, height/2.0)
c.hAngle += mouseSpeed * ((width / 2.0) - float64(xPos))
c.vAngle += mouseSpeed * ((height / 2.0) - float64(yPos))
dir := mgl32.Vec3{
float32(math.Cos(c.vAngle) * math.Sin(c.hAngle)),
float32(math.Sin(c.vAngle)),
float32(math.Cos(c.vAngle) * math.Cos(c.hAngle))}
right := mgl32.Vec3{
float32(math.Sin(c.hAngle - math.Pi/2.0)),
0.0,
float32(math.Cos(c.hAngle - math.Pi/2.0))}
up := right.Cross(dir)
if c.window.GetKey(glfw.KeyUp) == glfw.Press || c.window.GetKey('W') == glfw.Press {
c.pos = c.pos.Add(dir.Mul(float32(deltaT * speed)))
}
if c.window.GetKey(glfw.KeyDown) == glfw.Press || c.window.GetKey('S') == glfw.Press {
c.pos = c.pos.Sub(dir.Mul(float32(deltaT * speed)))
}
if c.window.GetKey(glfw.KeyRight) == glfw.Press || c.window.GetKey('D') == glfw.Press {
c.pos = c.pos.Add(right.Mul(float32(deltaT * speed)))
}
if c.window.GetKey(glfw.KeyLeft) == glfw.Press || c.window.GetKey('A') == glfw.Press {
c.pos = c.pos.Sub(right.Mul(float32(deltaT * speed)))
}
// Adding to the original tutorial, Space goes up
if c.window.GetKey(glfw.KeySpace) == glfw.Press {
c.pos = c.pos.Add(up.Mul(float32(deltaT * speed)))
}
// Adding to the original tutorial, left control goes down
if c.window.GetKey(glfw.KeyLeftControl) == glfw.Press {
c.pos = c.pos.Sub(up.Mul(float32(deltaT * speed)))
}
fov := initialFOV //- 5.0*float64(glfw.MouseWheel())
proj := mgl32.Perspective(float32(fov), 4.0/3.0, 0.1, 100.0)
view := mgl32.LookAtV(c.pos, c.pos.Add(dir), up)
c.time = currTime
return view, proj
}
func (bullet *Bullet) IsAlive() bool {
if glfw.GetTime() > bullet.createdTime+bullet.MaxLifetime {
return false
}
return bullet.Entity.IsAlive()
}
func (a *Application) HighFreqTime() float64 {
// TODO: cgo call overhead probably makes this less useful...
return glfw.GetTime()
}
