gg: simplify the minimal gg application even more with `context.user_data = context`

examples/gg/polygons.v

@@ -3,31 +3,23 @@ module main
 import gg
 import gx
 
-struct App {
-mut:
-	gg &gg.Context
-}
-
 fn main() {
-	mut app := &App{
-		gg: 0
-	}
-	app.gg = gg.new_context(
+	mut context := gg.new_context(
 		bg_color: gx.rgb(174, 198, 255)
 		width: 600
 		height: 400
 		window_title: 'Polygons'
 		frame_fn: frame
-		user_data: app
 	)
-	app.gg.run()
+	context.user_data = context
+	context.run()
 }
 
-fn frame(mut app App) {
-	app.gg.begin()
-	app.gg.draw_convex_poly([f32(100.0), 100.0, 200.0, 100.0, 300.0, 200.0, 200.0, 300.0, 100.0,
-		300.0], gx.blue)
-	app.gg.draw_empty_poly([f32(50.0), 50.0, 70.0, 60.0, 90.0, 80.0, 70.0, 110.0], gx.black)
-	app.gg.draw_triangle(450, 142, 530, 280, 370, 280, gx.red)
-	app.gg.end()
+fn frame(mut ctx gg.Context) {
+	ctx.begin()
+	ctx.draw_convex_poly([f32(100.0), 100.0, 200.0, 100.0, 300.0, 200.0, 200.0, 300.0, 100.0, 300.0],
+		gx.blue)
+	ctx.draw_empty_poly([f32(50.0), 50.0, 70.0, 60.0, 90.0, 80.0, 70.0, 110.0], gx.black)
+	ctx.draw_triangle(450, 142, 530, 280, 370, 280, gx.red)
+	ctx.end()
 }

vlib/gg/gg.c.v

@@ -54,6 +54,7 @@ pub mut:
 	window      C.sapp_desc
 	timage_pip  C.sgl_pipeline
 	config      Config
+	user_data   voidptr
 	ft          &FT
 	font_inited bool
 	ui_mode     bool // do not redraw everything 60 times/second, but only when the user requests
@@ -153,7 +154,7 @@ fn gg_init_sokol_window(user_data voidptr) {
 	g.timage_pip = sgl.make_pipeline(&pipdesc)
 	//
 	if g.config.init_fn != voidptr(0) {
-		g.config.init_fn(g.config.user_data)
+		g.config.init_fn(g.user_data)
 	}
 	// Create images now that we can do that after sg is inited
 	if g.native_rendering {
@@ -170,6 +171,7 @@ fn gg_init_sokol_window(user_data voidptr) {
 //
 pub fn new_context(cfg Config) &Context {
 	mut g := &Context{
+		user_data: cfg.user_data
 		width: cfg.width
 		height: cfg.height
 		config: cfg

vlib/gg/gg.v

@@ -113,7 +113,7 @@ fn gg_frame_fn(user_data voidptr) {
 			return
 		}
 	}
-	ctx.config.frame_fn(ctx.config.user_data)
+	ctx.config.frame_fn(ctx.user_data)
 	ctx.needs_refresh = false
 }