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 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)
}
func loadScene() {
texs := loadTextures()
scene = &sprite.Node{}
eng.Register(scene)
eng.SetTransform(scene, f32.Affine{
{1, 0, 0},
{0, 1, 0},
})
var n *sprite.Node
n = newNode()
eng.SetSubTex(n, texs[texBooks])
eng.SetTransform(n, f32.Affine{
{36, 0, 0},
{0, 36, 0},
})
n = newNode()
eng.SetSubTex(n, texs[texFire])
eng.SetTransform(n, f32.Affine{
{72, 0, 144},
{0, 72, 144},
})
n = newNode()
n.Arranger = arrangerFunc(func(eng sprite.Engine, n *sprite.Node, t clock.Time) {
// TODO: use a tweening library instead of manually arranging.
t0 := uint32(t) % 120
if t0 < 60 {
eng.SetSubTex(n, texs[texGopherR])
} else {
eng.SetSubTex(n, texs[texGopherL])
}
u := float32(t0) / 120
u = (1 - f32.Cos(u*2*math.Pi)) / 2
tx := 18 + u*48
ty := 36 + u*108
sx := 36 + u*36
sy := 36 + u*36
eng.SetTransform(n, f32.Affine{
{sx, 0, tx},
{0, sy, ty},
})
})
}
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"])
}
}
})
}