90 lines
2.4 KiB
Odin
90 lines
2.4 KiB
Odin
package main
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import "core:math/rand"
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import "core:strconv"
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import "core:strings"
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import ecs "../src"
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import rl "vendor:raylib"
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app: ecs.App
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ball_count: int = 10000
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BallComponent :: struct {
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radius: f32,
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speed: f32,
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}
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main :: proc() {
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ecs.add_plugin(&app, ecs.DefaultPlugin)
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ecs.add_system(&app, ecs.STARTUP, setup_window)
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ecs.add_system(&app, ecs.STARTUP, spawn_balls)
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ecs.add_system(&app, ecs.UPDATE, update_balls)
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ecs.add_system(&app, ecs.DRAW, draw_balls)
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ecs.add_system(&app, ecs.DRAW, show_framerate)
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ecs.run(&app)
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}
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// STARTUP system taking the world: the window lives in it, so adjusting the
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// default WindowComponent is a world lookup now
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setup_window :: proc(world: ^ecs.World) {
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window, _ := ecs.single(world, ecs.WindowComponent)
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window.background = rl.BLACK
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}
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// STARTUP system taking the world: spawn_entity wants it, and the balls'
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// components live inside it, no global storage to declare
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spawn_balls :: proc(world: ^ecs.World) {
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for i in 0 ..< ball_count {
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ball := ecs.spawn_entity(world)
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ecs.add_component(world, ball, BallComponent{radius = 5, speed = rand.float32_range(4, 6)})
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ecs.add_component(
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world,
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ball,
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ecs.TransformComponent {
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translation = {400, 300},
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rotation = rand.float32_range(0, 360),
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},
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)
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}
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}
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update_balls :: proc(world: ^ecs.World) {
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window, _ := ecs.single(world, ecs.WindowComponent)
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balls := ecs.slice(world, BallComponent)
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entities := ecs.slice_entity(world, BallComponent)
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for ball, i in balls {
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transform := ecs.get_component(world, entities[i], ecs.TransformComponent)
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pos := transform.translation
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if pos.x <= 0 || pos.x >= f32(window.width) || pos.y <= 0 || pos.y >= f32(window.height) {
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transform.rotation -= 180
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}
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dir := rl.Vector2Rotate(rl.Vector2{0, ball.speed}, transform.rotation)
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transform.translation += dir
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}
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}
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draw_balls :: proc(world: ^ecs.World) {
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balls := ecs.slice(world, BallComponent)
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entities := ecs.slice_entity(world, BallComponent)
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for ball, i in balls {
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transform := ecs.get_component(world, entities[i], ecs.TransformComponent)
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rl.DrawCircle(
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i32(transform.translation.x),
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i32(transform.translation.y),
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ball.radius,
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rl.PURPLE,
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)
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}
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}
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show_framerate :: proc() {
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fps_buf: [19]byte
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framerate := strconv.write_int(fps_buf[:], i64(1 / rl.GetFrameTime()), 10)
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rl.DrawText(strings.clone_to_cstring(framerate), 0, 0, 24, rl.WHITE)
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rl.DrawText(" fps", 0, 24, 24, rl.WHITE)
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rl.DrawText("10000 balls", 0, 24, 24, rl.WHITE)
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}
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