cloud-game/ui/gameview.go

package ui

import (
	"image"

	"github.com/giongto35/game-online/nes"
	"github.com/go-gl/gl/v2.1/gl"
	"github.com/go-gl/glfw/v3.2/glfw"
)

const padding = 0

type GameView struct {
	director *Director
	console  *nes.Console
	title    string
	hash     string
	texture  uint32
	record   bool
	frames   []image.Image

	keyPressed []bool

	imageChannel chan *image.RGBA
	inputChannel chan int
}

func NewGameView(director *Director, console *nes.Console, title, hash string, imageChannel chan *image.RGBA, inputChannel chan int) View {
	texture := createTexture()
	gameview := &GameView{director, console, title, hash, texture, false, nil, make([]bool, 255), imageChannel, inputChannel}
	go gameview.ListenToInputChannel()
	return gameview
}

func (view *GameView) ListenToInputChannel() {
	for {
		key := <-view.inputChannel
		if key < 0 {
			view.keyPressed[-key] = false
		} else {
			view.keyPressed[key] = true
		}

	}
}

func (view *GameView) Enter() {
	gl.ClearColor(0, 0, 0, 1)
	view.director.SetTitle(view.title)
	view.console.SetAudioChannel(view.director.audio.channel)
	view.console.SetAudioSampleRate(view.director.audio.sampleRate)
	view.director.window.SetKeyCallback(view.onKey)
	// load state
	if err := view.console.LoadState(savePath(view.hash)); err == nil {
		return
	} else {
		view.console.Reset()
	}
	// load sram
	cartridge := view.console.Cartridge
	if cartridge.Battery != 0 {
		if sram, err := readSRAM(sramPath(view.hash)); err == nil {
			cartridge.SRAM = sram
		}
	}
}

func (view *GameView) Exit() {
	view.director.window.SetKeyCallback(nil)
	view.console.SetAudioChannel(nil)
	view.console.SetAudioSampleRate(0)
	// save sram
	cartridge := view.console.Cartridge
	if cartridge.Battery != 0 {
		writeSRAM(sramPath(view.hash), cartridge.SRAM)
	}
	// save state
	view.console.SaveState(savePath(view.hash))
}

func (view *GameView) Update(t, dt float64) {
	if dt > 1 {
		dt = 0
	}
	window := view.director.window
	console := view.console
	if joystickReset(glfw.Joystick1) {
		view.director.ShowMenu()
	}
	if joystickReset(glfw.Joystick2) {
		view.director.ShowMenu()
	}
	if readKey(window, glfw.KeyEscape) {
		view.director.ShowMenu()
	}
	//updateControllers(window, console)
	view.updateControllers()
	console.StepSeconds(dt)
	gl.BindTexture(gl.TEXTURE_2D, view.texture)
	setTexture(console.Buffer())
	view.imageChannel <- console.Buffer()
	drawBuffer(view.director.window)
	gl.BindTexture(gl.TEXTURE_2D, 0)
	if view.record {
		view.frames = append(view.frames, copyImage(console.Buffer()))
	}
}

func (view *GameView) onKey(window *glfw.Window,
	key glfw.Key, scancode int, action glfw.Action, mods glfw.ModifierKey) {
	if action == glfw.Press {
		switch key {
		case glfw.KeySpace:
			screenshot(view.console.Buffer())
		case glfw.KeyR:
			view.console.Reset()
		case glfw.KeyTab:
			if view.record {
				view.record = false
				animation(view.frames)
				view.frames = nil
			} else {
				view.record = true
			}
		}
	}
}

func drawBuffer(window *glfw.Window) {
	w, h := window.GetFramebufferSize()
	s1 := float32(w) / 256
	s2 := float32(h) / 240
	f := float32(1 - padding)
	var x, y float32
	if s1 >= s2 {
		x = f * s2 / s1
		y = f
	} else {
		x = f
		y = f * s1 / s2
	}
	gl.Begin(gl.QUADS)
	gl.TexCoord2f(0, 1)
	gl.Vertex2f(-x, -y)
	gl.TexCoord2f(1, 1)
	gl.Vertex2f(x, -y)
	gl.TexCoord2f(1, 0)
	gl.Vertex2f(x, y)
	gl.TexCoord2f(0, 0)
	gl.Vertex2f(-x, y)
	gl.End()
}

func updateControllers(window *glfw.Window, console *nes.Console) {
	turbo := console.PPU.Frame%6 < 3
	k1 := readKeys(window, turbo)
	j1 := readJoystick(glfw.Joystick1, turbo)
	j2 := readJoystick(glfw.Joystick2, turbo)
	console.SetButtons1(combineButtons(k1, j1))
	console.SetButtons2(j2)
}

func (view *GameView) updateControllers() {
	// TODO: switch case
	var buttons [8]bool
	buttons[nes.ButtonLeft] = view.keyPressed[37]
	buttons[nes.ButtonUp] = view.keyPressed[38]
	buttons[nes.ButtonRight] = view.keyPressed[39]
	buttons[nes.ButtonDown] = view.keyPressed[40]
	buttons[nes.ButtonA] = view.keyPressed[32]
	buttons[nes.ButtonB] = view.keyPressed[17]
	buttons[nes.ButtonStart] = view.keyPressed[13]
	buttons[nes.ButtonSelect] = view.keyPressed[16]
	view.console.Controller1.SetButtons(buttons)
}