func onPaint(sz size.Event) {
gl.ClearColor(rgb(156), rgb(39), rgb(176), 1)
gl.Clear(gl.COLOR_BUFFER_BIT)
var rotationMatrix = []float32{
f32.Cos(-alpha), -f32.Sin(-alpha), 0.0,
f32.Sin(-alpha), f32.Cos(-alpha), 0.0,
0.0, 0.0, 1.0,
}
gl.UseProgram(program)
// setting color
gl.Uniform4f(color, rgb(255), rgb(255), rgb(255), 1)
gl.UniformMatrix3fv(matrixId, rotationMatrix)
gl.Uniform1f(resolutionId, resIndex)
gl.BindBuffer(gl.ARRAY_BUFFER, swasBuffer)
gl.EnableVertexAttribArray(position)
gl.VertexAttribPointer(position, 3, gl.FLOAT, false, 0, 0)
gl.DrawArrays(gl.LINES, 0, 16)
gl.DisableVertexAttribArray(position)
gl.UseProgram(texProgram)
// setting color
gl.Uniform4f(color2, rgb(130), rgb(50), rgb(80), 1)
gl.Uniform1f(resolutionId2, resIndex)
gl.UniformMatrix3fv(matrixId2, rotationMatrix)
gl.BindBuffer(gl.ARRAY_BUFFER, quadBuffer)
gl.EnableVertexAttribArray(position2)
gl.VertexAttribPointer(position2, 3, gl.FLOAT, false, 0, 0)
gl.BindBuffer(gl.ARRAY_BUFFER, quadTexBuffer)
gl.EnableVertexAttribArray(textureCoords)
gl.VertexAttribPointer(textureCoords, 2, gl.FLOAT, false, 0, 0)
gl.Uniform1i(gl.GetUniformLocation(texProgram, "myTexture"), 0)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, textureId)
gl.DrawArrays(gl.TRIANGLES, 0, 6)
gl.DisableVertexAttribArray(position2)
gl.DisableVertexAttribArray(textureCoords)
if spin == true {
alpha += 0.1
}
if alpha >= 360 {
alpha = 0.0
}
}
func (sprite *KonaSprite) Apply() {
curPosX := sprite.posX
curPosY := sprite.posY
r := sprite.radian * 3.141592653 / 180
affine = &f32.Affine{
{sprite.width * f32.Cos(r), sprite.height * -f32.Sin(r),
curPosX - (sprite.width/2)*f32.Cos(r) + (sprite.height/2)*f32.Sin(r)},
{sprite.width * f32.Sin(r), sprite.height * f32.Cos(r),
curPosY - (sprite.height/2)*f32.Cos(r) - (sprite.width/2)*f32.Sin(r)},
}
eng.SetTransform(sprite.node, *affine)
}
func GenOscilator(freq float32) Oscilator {
k := 2.0 * Pi * freq
T := 1.0 / freq
dt := 1.0 / float32(SampleRate)
t := float32(0.0)
return func() float32 {
res := f32.Sin(k * t)
t += dt
if t > T {
t -= T
}
return res
}
}
func genCircleTriangles(Xcenter, Ycenter, radius float32) []byte {
points := make([]float32, 192)
i := 1
points[0] = Xcenter
points[1] = Ycenter
points[2] = radius
for angle := float32(0.0); angle < 3.14159*2; angle += 0.1 {
points[3*i] = radius * f32.Cos(angle)
points[3*i+1] = radius * f32.Sin(angle)
points[3*i+2] = float32(0.0)
fmt.Println(angle, points[3*i], points[3*i+1], points[3*i+2])
i++
}
return byteList(binary.LittleEndian, points)
}
// NewPianoKey returns a key for our piano.
func NewPianoKey(pos mgl32.Vec3, lightColor mgl32.Vec3, white bool, freq float32) PianoKey {
var color mgl32.Vec4
var keySize float32
if white {
color = mgl32.Vec4{0.98, 0.97, 0.94}
keySize = 2
} else {
color = mgl32.Vec4{0.1, 0.1, 0.1, 1.0}
keySize = 1
}
pk := PianoKey{Pos: pos, Angle: 0, Color: color, Frequency: freq, Finger: -1, white: white, LightColor: lightColor}
pk.BBox[0] = pos.Sub(mgl32.Vec3{0.5, 0.6, keySize})
pk.BBox[1] = pos.Add(mgl32.Vec3{0.5, 0.6, keySize})
pk.source = al.GenSources(1)[0]
pk.source.SetGain(1.0)
pk.source.SetPosition(al.Vector{pos.X(), pos.Y(), pos.Z()})
pk.source.SetVelocity(al.Vector{})
pk.buffers = al.GenBuffers(3)
var samples [1024 * 16]int16
sampleRate := 44100
amplitude := float32(0.8 * 0x7FFF)
for i := 0; i < len(samples); i++ {
val := f32.Sin((2.0 * math.Pi * freq) / float32(sampleRate) * float32(i))
samples[i] = int16(amplitude * val)
}
buf := &bytes.Buffer{}
binary.Write(buf, binary.LittleEndian, &samples)
pk.buffers[0].BufferData(al.FormatMono16, buf.Bytes(), 44100)
f, _ := os.Create("audio.raw")
binary.Write(f, binary.LittleEndian, &samples)
f.Close()
return pk
}
func loadScene(c event.Config) {
gl.Enable(gl.BLEND)
gl.BlendEquation(gl.FUNC_ADD)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
w, h := float32(c.Width), float32(c.Height)
texs = loadTextures()
scene = &sprite.Node{}
eng.Register(scene)
a := f32.Affine{
{1, 0, 0},
{0, 1, 0},
}
if h > w {
w, h = h, w
angle := float32(-math.Pi / 2)
a = f32.Affine{
{f32.Cos(angle), -f32.Sin(angle), 0},
{f32.Sin(angle), f32.Cos(angle), w},
}
}
scale = w / 1100
eng.SetTransform(scene, a)
x0 = w/2 - 500*scale
y0 = h/2 - 100*scale
//log.Printf("width:%f height:%f scale:%f x0:%f y0:%f", w, h, scale, x0, y0)
timeNode := newTimeNode()
scene.AppendChild(timeNode)
startNode := newStartNode()
scene.AppendChild(startNode)
endNode := newEndNode()
scene.AppendChild(endNode)
startVisilbe, endVisible := false, false
scene.Arranger = arrangerFunc(func(eng sprite.Engine, n *sprite.Node, t clock.Time) {
switch state {
case stateStart:
if !startVisilbe {
startVisilbe = true
eng.SetSubTex(startNode, texs["GO"])
}
if endVisible {
eng.SetSubTex(endNode, sprite.SubTex{})
endVisible = false
}
case stateRunning:
if startVisilbe {
eng.SetSubTex(startNode, sprite.SubTex{})
startVisilbe = false
}
case stateEnd:
if !endVisible {
endVisible = true
eng.SetSubTex(endNode, texs["gooon"])
}
}
})
}