First pass at displaying Menu files

cmd/view-menu/main.go

@@ -0,0 +1,198 @@
+package main
+
+import (
+	"flag"
+	"log"
+	"os"
+	"path/filepath"
+
+	"github.com/faiface/pixel"
+	"github.com/faiface/pixel/pixelgl"
+	"golang.org/x/image/colornames"
+
+	"ur.gs/ordoor/internal/conv"
+	"ur.gs/ordoor/internal/data"
+	"ur.gs/ordoor/internal/menus"
+	"ur.gs/ordoor/internal/ui"
+)
+
+var (
+	gamePath = flag.String("game-path", "./orig", "Path to a WH40K: Chaos Gate installation")
+	menuFile = flag.String("menu", "", "Path to a .mnu file, e.g. ./orig/Menu/MainGame.mnu")
+)
+
+type env struct {
+	menu    *menus.Menu
+	objects []*conv.Object
+	batch   *pixel.Batch
+}
+
+type state struct {
+	env *env
+
+	step int
+	// Redraw the window if these change
+	winPos    pixel.Vec
+	winBounds pixel.Rect
+}
+
+func main() {
+	flag.Parse()
+
+	if *gamePath == "" || *menuFile == "" {
+		flag.Usage()
+		os.Exit(1)
+	}
+
+	menu, err := menus.LoadMenu(*menuFile)
+	if err != nil {
+		log.Fatalf("Couldn't load menu file %s: %v", *menuFile, err)
+	}
+
+	rawObjs := []*data.Object{}
+	for _, name := range menu.ObjectFiles {
+		objFile := filepath.Join(filepath.Dir(*menuFile), name)
+		obj, err := data.LoadObject(objFile)
+		if err != nil {
+			log.Fatalf("Failed to load %s: %v", name, err)
+		}
+		obj.Name = name
+
+		rawObjs = append(rawObjs, obj)
+	}
+
+	objects, spritesheet := conv.ConvertObjects(rawObjs)
+	batch := pixel.NewBatch(&pixel.TrianglesData{}, spritesheet)
+
+	env := &env{objects: objects, menu: menu, batch: batch}
+
+	// The main thread now belongs to pixelgl
+	pixelgl.Run(env.run)
+}
+
+func (e *env) run() {
+	win, err := ui.NewWindow("View Menu: " + *menuFile)
+	if err != nil {
+		log.Fatal("Couldn't create window: %v", err)
+	}
+
+	pWin := win.PixelWindow
+	state := &state{env: e}
+
+	// For now, just try to display the various objects
+	// left + right to change object, up + down to change frame
+	win.Run(func() {
+		oldState := *state
+		state = state.runStep(pWin)
+
+		if oldState != *state || oldState.step == 0 {
+			state.present(pWin)
+		}
+
+		state.step += 1
+	})
+}
+
+func (s *state) runStep(pWin *pixelgl.Window) *state {
+	newState := *s
+	newState.winPos = pWin.GetPos()
+	newState.winBounds = pWin.Bounds()
+	newState.handleKeys(pWin)
+
+	return &newState
+}
+
+const (
+	origX = 640.0
+	origY = 480.0
+)
+
+func (s *state) present(pWin *pixelgl.Window) {
+	pWin.Clear(colornames.Black)
+	s.env.batch.Clear()
+
+	// The menus expect to be drawn to a 640x480 screen. We need to scale and
+	// project that so it fills the window appropriately. This is a combination
+	// of translate + zoom
+	winSize := pWin.Bounds().Max
+	scaleFactor := pixel.Vec{winSize.X / origX, winSize.Y / origY}
+
+	cam := pixel.IM
+	cam = cam.ScaledXY(pixel.ZV, pixel.Vec{1.0, -1.0}) // invert the Y axis
+	cam = cam.Moved(pixel.Vec{origX / 2, origY / 2})
+	cam = cam.ScaledXY(pixel.ZV, scaleFactor)
+	s.env.batch.SetMatrix(cam)
+
+	for _, record := range s.env.menu.Records {
+		s.drawRecord(record, s.env.batch)
+	}
+
+	s.env.batch.Draw(pWin)
+}
+
+func (s *state) drawRecord(record *menus.Record, target pixel.Target) {
+	if !record.Active {
+		return
+	}
+
+	// Draw this record if it's valid to do so. FIXME: lots to learn
+	if record.SpriteId >= 0 {
+		x := float64(record.X)
+		y := float64(record.Y)
+
+		// FIXME: some are set at -1, -1. No idea why
+		if x < 0.0 {
+			x = 0.0
+		}
+		if y < 0.0 {
+			y = 0.0
+		}
+
+		log.Printf(
+			"Drawing id=%v type=%v spriteid=%v x=%v y=%v",
+			record.Id, record.Type, record.SpriteId, x, y,
+		)
+
+		// FIXME: Need to handle multiple objects
+		obj := s.env.objects[0]
+		sprite := obj.Sprites[record.SpriteId]
+		sprite.Spr.Draw(target, pixel.IM.Moved(pixel.V(x, y)))
+	}
+
+	// Draw all children of this record
+	for _, child := range record.Children {
+		s.drawRecord(child, target)
+	}
+}
+
+func (s *state) handleKeys(pWin *pixelgl.Window) {
+	/*
+		if pWin.JustPressed(pixelgl.KeyLeft) {
+			if s.objIdx > 0 {
+				s.objIdx -= 1
+				s.spriteIdx = 0
+			}
+		}
+
+		if pWin.JustPressed(pixelgl.KeyRight) {
+			if s.objIdx < s.env.set.Count()-1 {
+				s.objIdx += 1
+				s.spriteIdx = 0
+			}
+		}
+
+		if pWin.JustPressed(pixelgl.KeyDown) {
+			if s.spriteIdx > 0 {
+				s.spriteIdx -= 1
+			}
+		}
+
+		if pWin.JustPressed(pixelgl.KeyUp) {
+			if s.spriteIdx < len(s.curObject().Sprites)-1 {
+				s.spriteIdx += 1
+			}
+		}
+		// Zoom in and out with the mouse wheel
+		s.zoom *= math.Pow(1.2, pWin.MouseScroll().Y)
+	*/
+}