gameplay prototype

general/main.odin

@@ -1,7 +1,6 @@
 package main
 
 import "core:fmt"
-import "ecs"
 import rl "vendor:raylib"
 
 World :: struct {
@@ -15,7 +14,6 @@ camera: rl.Camera2D
 CELL_SIZE :: 20
 
 main :: proc() {
-	ecs.ping()
 	fmt.println("hello world")
 	rl.InitWindow(800, 600, "grimm gameplay prototype")
 	defer rl.CloseWindow()
@@ -59,6 +57,7 @@ update :: proc() {
 		move(&enemy.transform, 1, 0)
 	}
 
+	run_timers()
 }
 
 draw :: proc() {
@@ -77,7 +76,6 @@ draw :: proc() {
 		rl.BLUE,
 	)
 
-
 	for x in 0 ..< 26 {
 		for y in 0 ..< 26 {
 			rl.DrawRectangleLines(
@@ -90,11 +88,13 @@ draw :: proc() {
 		}
 	}
 
-	if rl.IsMouseButtonDown(rl.MouseButton.LEFT) {
+	if rl.IsMouseButtonPressed(rl.MouseButton.LEFT) {
 		pos := rl.GetScreenToWorld2D(rl.GetMousePosition(), player.camera)
 		pos_x := int(pos.x / CELL_SIZE) * CELL_SIZE
 		pos_y := int(pos.y / CELL_SIZE) * CELL_SIZE
-		shoot({f32(pos_x), f32(pos_y)}, player.transform)
+		shoot(player.transform, {f32(pos_x), f32(pos_y)})
 	}
 
+	run_particle_system()
+
 }

general/particles.odin

@@ -0,0 +1,60 @@
+package main
+
+import "core:rexcode/isa/x86/tablegen/generated"
+import rl "vendor:raylib"
+
+Particle :: union {
+	SpriteParticle,
+	LineParticle,
+}
+
+SpriteParticle :: struct {
+	pos:      rl.Vector2,
+	texture:  rl.Texture2D,
+	tint:     rl.Color,
+	lifetime: f32,
+}
+LineParticle :: struct {
+	pos1:     rl.Vector2,
+	pos2:     rl.Vector2,
+	tint:     rl.Color,
+	lifetime: f32,
+}
+
+particles: [dynamic]Particle
+
+spawn_particle :: proc(particle: Particle) {
+	append(&particles, particle)
+}
+
+run_particle_system :: proc() {
+	for &p, i in particles {
+		draw_particle(&p, i)
+	}
+}
+
+draw_particle :: proc(particle: ^Particle, index: int) {
+	switch &p in particle {
+	case SpriteParticle:
+		draw_sprite_particle(&p, index)
+
+	case LineParticle:
+		draw_line_particle(&p, index)
+	}
+}
+
+draw_sprite_particle :: proc(particle: ^SpriteParticle, index: int) {
+	rl.DrawTexture(particle.texture, i32(particle.pos.x), i32(particle.pos.y), particle.tint)
+	particle.lifetime -= rl.GetFrameTime()
+	if particle.lifetime <= 0 {
+		particles[index] = nil
+	}
+}
+
+draw_line_particle :: proc(particle: ^LineParticle, index: int) {
+	rl.DrawLineV(particle.pos1, particle.pos2, particle.tint)
+	particle.lifetime -= rl.GetFrameTime()
+	if particle.lifetime <= 0 {
+		particles[index] = nil
+	}
+}

general/systems.odin

@@ -1,5 +1,6 @@
 package main
 
+import "core:fmt"
 import rl "vendor:raylib"
 
 move :: proc(t: ^Transform, x, y: f32) {
@@ -13,16 +14,21 @@ move :: proc(t: ^Transform, x, y: f32) {
 	}
 }
 
-shoot :: proc(pos: rl.Vector2, t: Transform) {
+shoot :: proc(t: Transform, pos: rl.Vector2) {
 	pos_centered := center_to_grid(pos)
 	t_centered := center_to_grid(t.position)
-	rl.DrawLine(
-		i32(t.position.x) * CELL_SIZE + (CELL_SIZE / 2),
-		i32(t.position.y) * CELL_SIZE + (CELL_SIZE / 2),
-		i32(pos_centered.x),
-		i32(pos_centered.y),
-		rl.WHITE,
-	)
+	line_particle := LineParticle {
+		pos1     = t.position * CELL_SIZE + 10,
+		pos2     = pos + 10,
+		tint     = rl.WHITE,
+		lifetime = 0.2,
+	}
+	spawn_particle(line_particle)
+	start_timer(1, test_timer_callback)
+}
+
+test_timer_callback :: proc() {
+	fmt.println("timer finished")
 }
 
 center_to_grid :: proc(pos: rl.Vector2) -> rl.Vector2 {

general/timer.odin

@@ -0,0 +1,28 @@
+package main
+
+import rl "vendor:raylib"
+
+Timer :: struct {
+	lifetime: f32,
+	callback: proc(),
+}
+
+timers: [dynamic]Timer
+
+start_timer :: proc(time: f32, callback: proc()) {
+	new_timer := Timer {
+		lifetime = time,
+		callback = callback,
+	}
+	append(&timers, new_timer)
+}
+
+run_timers :: proc() {
+	for &t, i in timers {
+		t.lifetime -= rl.GetFrameTime()
+		if t.lifetime <= 0 {
+			unordered_remove(&timers, i)
+			t.callback()
+		}
+	}
+}