func joystick(buttons uint, x, y, z int) {
if buttons&0x1 > 0 {
thrust = true
thrustTime = glut.Get(glut.ELAPSED_TIME)
joyThrust = true
} else {
if joyThrust {
thrust = false
joyThrust = false
}
}
if buttons&0x2 > 0 {
shotBullet()
}
if buttons&0x4 > 0 {
shield = true
joyShield = true
} else {
if joyShield {
shield = false
joyShield = false
}
}
if x < -300 {
left = true
leftTime = glut.Get(glut.ELAPSED_TIME)
joyLeft = true
} else {
/* joyLeft helps avoid "joystick in neutral"
from continually stopping rotation. */
if joyLeft {
left = false
joyLeft = false
}
}
if x > 300 {
right = true
rightTime = glut.Get(glut.ELAPSED_TIME)
joyRight = true
} else {
/* joyRight helps avoid "joystick in neutral"
from continually stopping rotation. */
if joyRight {
right = false
joyRight = false
}
}
}
func key(key byte, px, py int) {
switch key {
case 27:
os.Exit(0)
case 'A':
case 'a':
thrust = true
thrustTime = glut.Get(glut.ELAPSED_TIME)
case 'S':
case 's':
shield = true
case 'C':
case 'c':
cursor = !cursor
if cursor {
glut.SetCursor(glut.CURSOR_INHERIT)
} else {
glut.SetCursor(glut.CURSOR_NONE)
}
case 'z':
case 'Z':
x = 20
y = 20
xv = 0
yv = 0
case 'f':
glut.GameModeString("640x480:32@60")
glut.EnterGameMode()
initWindow()
case 'g':
glut.GameModeString("800x600:32@60")
glut.EnterGameMode()
initWindow()
case 'l':
if originalWindow != 0 && currentWindow != originalWindow {
glut.LeaveGameMode()
currentWindow = originalWindow
}
case 'P':
case 'p':
paused = !paused
if paused {
glut.IdleFunc(nil)
} else {
glut.IdleFunc(idle)
resuming = true
}
case 'Q':
case 'q':
case ' ':
shotBullet()
}
}
func special(key, x, y int) {
switch key {
case glut.KEY_F1:
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.Enable(gl.BLEND)
gl.Enable(gl.LINE_SMOOTH)
gl.Enable(gl.POINT_SMOOTH)
case glut.KEY_F2:
gl.Disable(gl.BLEND)
gl.Disable(gl.LINE_SMOOTH)
gl.Disable(gl.POINT_SMOOTH)
case glut.KEY_UP:
thrust = true
thrustTime = glut.Get(glut.ELAPSED_TIME)
case glut.KEY_LEFT:
left = true
leftTime = glut.Get(glut.ELAPSED_TIME)
case glut.KEY_RIGHT:
right = true
rightTime = glut.Get(glut.ELAPSED_TIME)
}
}
func idle() {
var delta int
time := glut.Get(glut.ELAPSED_TIME)
if resuming {
lastTime = time
resuming = false
}
if left {
delta = time - leftTime
angle = angle + gl.GLfloat(delta)*gl.GLfloat(0.4)
leftTime = time
}
if right {
delta = time - rightTime
angle = angle - gl.GLfloat(delta)*gl.GLfloat(0.4)
rightTime = time
}
if thrust {
delta = time - thrustTime
v = gl.GLfloat(delta) * 0.00004
xv = xv + gl.GLfloat(math.Cos(float64(angle)*math.Pi/180.0))*v
yv = yv + gl.GLfloat(math.Sin(float64(angle)*math.Pi/180.0))*v
thrustTime = time
}
delta = time - lastTime
x = x + xv*gl.GLfloat(delta)
y = y + yv*gl.GLfloat(delta)
x = x / 40.0
x = (x - gl.GLfloat(math.Floor(float64(x)))) * 40.0
y = y / 40.0
y = (y - gl.GLfloat(math.Floor(float64(y)))) * 40.0
lastTime = time
advanceBullets(delta, time)
currentWindow.PostRedisplay()
}
func shotBullet() {
entry := allocBullet()
if entry >= 0 {
initBullet(entry, glut.Get(glut.ELAPSED_TIME))
}
}