Complete engine game loop+abstract imgui

engine/game.go

@@ -0,0 +1,53 @@
+package engine
+
+import (
+	"github.com/bloeys/nmage/timing"
+	nmageimgui "github.com/bloeys/nmage/ui/imgui"
+	"github.com/go-gl/gl/v4.1-core/gl"
+)
+
+type Game interface {
+	Init()
+
+	FrameStart()
+	Update()
+	Render()
+	FrameEnd()
+	ShouldRun() bool
+
+	GetWindow() *Window
+	GetImGUI() nmageimgui.ImguiInfo
+
+	Deinit()
+}
+
+func Run(g Game) {
+
+	g.Init()
+
+	w := g.GetWindow()
+	ui := g.GetImGUI()
+	for g.ShouldRun() {
+
+		width, height := w.SDLWin.GetSize()
+		fbWidth, fbHeight := w.SDLWin.GLGetDrawableSize()
+
+		timing.FrameStarted()
+		w.handleInputs()
+		ui.FrameStart(float32(width), float32(height))
+
+		g.FrameStart()
+
+		g.Update()
+
+		gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
+		g.Render()
+		ui.Render(float32(width), float32(height), fbWidth, fbHeight)
+		w.SDLWin.GLSwap()
+
+		g.FrameEnd()
+		timing.FrameEnded()
+	}
+
+	g.Deinit()
+}