func moveCamera(camera *trace.FreeFlightCamera, dtf float32) {
state := sdl.GetKeyboardState()
switch {
case state[sdl.GetScancodeFromKey(sdl.K_UP)] != 0:
camera.YRot += dtf * cameraSpeed
case state[sdl.GetScancodeFromKey(sdl.K_DOWN)] != 0:
camera.YRot -= dtf * cameraSpeed
case state[sdl.GetScancodeFromKey(sdl.K_LEFT)] != 0:
camera.XRot += dtf * cameraSpeed
case state[sdl.GetScancodeFromKey(sdl.K_RIGHT)] != 0:
camera.XRot -= dtf * cameraSpeed
case state[sdl.GetScancodeFromKey(sdl.K_w)] != 0:
camera.Move(dtf * cameraSpeed)
case state[sdl.GetScancodeFromKey(sdl.K_s)] != 0:
camera.Move(dtf * -cameraSpeed)
case state[sdl.GetScancodeFromKey(sdl.K_a)] != 0:
camera.Strafe(dtf * cameraSpeed)
case state[sdl.GetScancodeFromKey(sdl.K_d)] != 0:
camera.Strafe(dtf * -cameraSpeed)
case state[sdl.GetScancodeFromKey(sdl.K_e)] != 0:
camera.Lift(dtf * cameraSpeed)
case state[sdl.GetScancodeFromKey(sdl.K_q)] != 0:
camera.Lift(dtf * -cameraSpeed)
}
}
func updateCamera(ws *websocket.WebSocket, gl *webgl.Context, renderer <-chan struct{}) {
const tick30hz = (1000 / 30) * time.Millisecond
var (
camera trace.FreeFlightCamera
oldPos [3]float32
positions = make(chan [3]float32, 1)
)
positions <- oldPos
go func() {
for {
pos := <-positions
fmt.Println("New position:", pos)
m, err := json.Marshal(updateMessage{Position: pos})
assert(err)
assert(ws.Send(string(m)))
<-renderer
}
}()
for _ = range time.Tick(tick30hz) {
switch {
case keys[38]: // Up
camera.YRot += cameraSpeed
case keys[40]: // Down
camera.YRot -= cameraSpeed
case keys[37]: // Left
camera.XRot += cameraSpeed
case keys[39]: // Right
camera.XRot -= cameraSpeed
case keys[87]: // W
camera.Move(cameraSpeed)
case keys[83]: // S
camera.Move(-cameraSpeed)
case keys[65]: // A
camera.Strafe(cameraSpeed)
case keys[68]: // D
camera.Strafe(-cameraSpeed)
case keys[69]: // E
camera.Lift(cameraSpeed)
case keys[81]: // Q
camera.Lift(-cameraSpeed)
}
if oldPos != camera.Pos {
select {
case positions <- camera.Pos:
oldPos = camera.Pos
default:
}
}
mat := mat4.Ident
mat.AssignEulerRotation(camera.XRot, camera.YRot, 0)
mat.Transpose()
gl.UniformMatrix4fv(uniformViewLocation, false, mat.Slice())
gl.DrawArrays(gl.TRIANGLES, 0, 6)
}
}
