add debug mode for drawing either minimap or palette

main.go

@@ -12,12 +12,20 @@ import (
 	"github.com/veandco/go-sdl2/sdl"
 )
 
+type DebugMode int
+
+const (
+	DebugMode_NONE DebugMode = iota
+	DebugMode_MINIMAP
+	DebugMode_PALETTE
+)
+
 var (
 	gfxContext   *graphics.Context
 	player       Player
 	level        *world.Level
 	startOfFrame time.Time
-	drawMinimap  bool
+	debugMode    DebugMode
 )
 
 func loadLevel(newLevel *world.Level) {
@@ -40,8 +48,18 @@ func update() bool {
 		case *sdl.KeyboardEvent:
 			if ev.Type == sdl.KEYDOWN {
 				switch ev.Keysym.Sym {
+				case sdl.K_p:
+					if debugMode != DebugMode_PALETTE {
+						debugMode = DebugMode_PALETTE
+					} else {
+						debugMode = DebugMode_NONE
+					}
 				case sdl.K_m:
-					drawMinimap = !drawMinimap
+					if debugMode != DebugMode_MINIMAP {
+						debugMode = DebugMode_MINIMAP
+					} else {
+						debugMode = DebugMode_NONE
+					}
 				case sdl.K_ESCAPE:
 					return true
 				}
@@ -89,9 +107,12 @@ func main() {
 		}
 
 		render.DrawScene(gfxContext, player.Transform, level)
-		if drawMinimap {
+		if debugMode == DebugMode_MINIMAP {
 			render.DrawMiniMap(gfxContext, player.Transform, level)
 		}
+		if debugMode == DebugMode_PALETTE {
+			render.DrawPalette(gfxContext, 16, 16)
+		}
 		gfxContext.Sync()
 
 		elapsed := time.Since(startOfFrame)