AllenDang/giu で CHIP-8 エミュレータを書こうとした残骸

main.go

package main

import (
	"fmt"
	"image"
	"image/color"

	"github.com/AllenDang/giu"
	g "github.com/AllenDang/giu"
	"github.com/AllenDang/imgui-go"
)

var (
	multiline      string
	rgba           *image.RGBA
	tex            *g.Texture
	titleBarHeight float32
	windowFlags    giu.WindowFlags = imgui.WindowFlagsNoCollapse |
		imgui.WindowFlagsNoMove |
		imgui.WindowFlagsNoResize
)

const (
	MASTER_WINDOW_WIDTH  = 800
	MASTER_WINDOW_HEIGHT = 600
	DISPLAY_WIDTH        = 640
	DISPLAY_HEIGHT       = 320
)

func buildMessage() g.Layout {
	labels := make([]*g.LabelWidget, 10)

	g.Label("CHIP-8 Dear ImGUI initialized")
	g.Label("Please drag and drop CHIP-8's ROM")

	for i := 0; i < 10; i++ {
		message := fmt.Sprintf("Message %d", i)
		labels[i] = g.Label(message)
	}

	return g.Layout([]g.Widget{labels[0], labels[1]})
}

func loop() {
	// refs: https://github.com/ocornut/imgui/issues/1539
	// titleBarHeight = imgui.FontSize() + (imgui.CurrentStyle().FramePadding().Y * 2)

	g.NewTextureFromRgba(rgba, func(t *g.Texture) {
		tex = t
	})

	display := g.Window("Display")
	logging := g.Window("Logging")
	debug := g.Window("Debug")

	// PushStyleVar したら PopStyleVar を呼び忘れないこと
	imgui.PushStyleVarFloat(imgui.StyleVarWindowRounding, 0.0)
	imgui.PushStyleVarVec2(imgui.StyleVarWindowPadding, imgui.Vec2{X: 0, Y: 0})

	display.
		Flags(windowFlags).
		Layout(
			g.ImageWithRgba(rgba).OnClick(func() {
				fmt.Println("rgba image was clicked")
			}).Size(DISPLAY_WIDTH, DISPLAY_HEIGHT),

			// g.Custom(func() {
			// 	width, height := g.GetAvailableRegion()

			// 	pos := g.GetCursorPos()

			// 	canvas := g.GetCanvas()
			// 	canvas.AddRectFilled(pos, pos.Add(image.Pt(int(width), int(height))), color.RGBA{12, 12, 200, 255}, 0, g.DrawFlagsClosed)
			// }),
		)

	// Pop StyleVarWindowPadding
	imgui.PopStyleVar()

	displayW, displayH := display.CurrentSize()

	widgetHeight := float32((MASTER_WINDOW_HEIGHT - DISPLAY_HEIGHT) / 2.0)

	logging.
		Flags(windowFlags).
		Pos(0, displayH).
		Size(displayW, widgetHeight).
		Layout(
			buildMessage(),
		)

	io := imgui.CurrentIO()
	fpsMessage := fmt.Sprintf("Application average %.3f ms/frame (%.1f FPS)", 1000.0/.Framerate(), imgui.CurrentIO().Framerate())
	debug.
		Flags(windowFlags).
		Pos(0, displayH+widgetHeight).
		Layout(

		)

	// Pop StyleVarWindowRounding
	imgui.PopStyleVar()
}

func grad(img *image.RGBA) {
	rect := img.Rect
	for h := rect.Min.Y; h < rect.Max.Y; h++ {
		for v := rect.Min.X; v < rect.Max.X; v++ {
			img.Set(v, h, color.RGBA{
				uint8(255 * h / rect.Max.Y),
				uint8(255 * v / rect.Max.X),
				uint8(255 * v * h / (rect.Max.X * rect.Max.Y)),
				255})
		}
	}
}

func main() {
	rgba = image.NewRGBA(image.Rect(0, 0, DISPLAY_WIDTH, DISPLAY_HEIGHT))
	grad(rgba)

	w := g.NewMasterWindow("Chip-8 Dear ImGUI", MASTER_WINDOW_WIDTH, MASTER_WINDOW_HEIGHT, g.MasterWindowFlagsNotResizable)
	w.SetBgColor(color.RGBA{255, 255, 255, 255})
	// g.EnqueueNewTextureFromRgba(rgba, func(t *g.Texture) {
	// 	tex = t
	// })

	w.Run(loop)
}