Exemple #1
0
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)
	}
}