snipplets.dev/code/V/example_window/game.v

import os
import gg
import gx
import sokol.sapp

const (
	win_width  = 512
	win_height = 512
)

struct Game {
mut:
	gg         &gg.Context = unsafe { nil }
	player     Player
	bg_texture BgTexture
}

struct BgTexture {
mut:
	image gg.Image
	pos_x f32
	pos_y f32
}

struct Player {
mut:
	pos_x int
	pos_y int
	lives int
	image gg.Image
}

fn frame(mut game Game) {
	game.update()
	game.draw()
}

fn main() {
	print('Loading... ')
	mut game := &Game{}

	mut font_path := os.resource_abs_path(os.join_path('..', '..', '.assets', 'monogram-extended.ttf'))

	game.gg = gg.new_context(
		bg_color: gx.hex(0x2A2A3AFF)
		width: win_width
		height: win_height
		create_window: true
		enable_dragndrop: false
		window_title: 'Runner'
		font_path: font_path
		user_data: game
		frame_fn: frame
		event_fn: on_event
	)

	game.player = &Player{
		pos_x: 10
		pos_y: 10
		lives: 3
	}

	game.bg_texture = &BgTexture{
		pos_x: 0
		pos_y: 0
	}

	game.bg_texture.image = game.gg.create_image(os.resource_abs_path(os.join_path('..',
		'..', '.assets', 'fondo para itchio.png'))) or { panic(err) }
	game.player.image = game.gg.create_image(os.resource_abs_path(os.join_path('..', '..',
		'.assets', 'v-logo.png'))) or { panic(err) }

	println('OK!\n')
	println('High DPI:    ${gg.high_dpi()}')
	println('Window size: ${gg.window_size().width}x${gg.window_size().height}')
	println('Screen size: ${gg.screen_size().width}x${gg.screen_size().height}')
	println('Fullscreen:  ${gg.is_fullscreen()}\n')

	game.gg.run()
	println('\nBye!')
}

fn (mut game Game) key_down(key gg.KeyCode) {
	match key {
		// vfmt off
		.escape { game.gg.quit() }
		// vfmt on
		.f11 {
			sapp.toggle_fullscreen()
			println('Set fullscreen: ${gg.is_fullscreen()}')
		}
		// vfmt off
		.left { game.player.pos_x -= 2 }
		.right { game.player.pos_x += 2 }
		.up { game.player.pos_y -= 2 }
		.down { game.player.pos_y += 2 }
		// vfmt on
		else {}
	}
}

fn on_event(e &gg.Event, mut game Game) {
	// println('code=$e.char_code')
	// println('code=$e.key_code')

	match e.typ {
		.key_down {
			game.key_down(e.key_code)
		}
		else {}
	}
}