From 90da5934d732a18a78705e966d315f86b38da698 Mon Sep 17 00:00:00 2001
From: codegirl-007 <s.raide@gmail.com>
Date: Sat, 1 Aug 2026 10:37:36 -0700
Subject: [PATCH] determine pivot based on manifest

---
 engine/sprite.odin      | 11 ++++++++---
 engine/sprite_test.odin | 14 ++++++++++++++
 2 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/engine/sprite.odin b/engine/sprite.odin
index fb46604..991fc55 100644
--- a/engine/sprite.odin
+++ b/engine/sprite.odin
@@ -99,9 +99,10 @@ draw_sprite :: proc(app: ^App, sprite: ^Sprite) {
 	fw := f32(rect[2])
 	fh := f32(rect[3])
 
-	// Feet-centered placement, same as renderer version
-	x0_px := sprite.position.x - fw * 0.5
-	y0_px := sprite.position.y - fh
+	pivot := sprite.data.def.pivot
+	origin := sprite_quad_origin(sprite.position, {fw, fh}, pivot)
+	x0_px := origin.x
+	y0_px := origin.y
 	x1_px := x0_px + fw
 	y1_px := y0_px + fh
 
@@ -191,3 +192,7 @@ set_sprite_clip :: proc(sprite: ^Sprite, clip: string) {
 	sprite.frame = 0
 	sprite.time = 0
 }
+
+sprite_quad_origin :: proc(position: Vec2, size: Vec2, pivot: [2]f32) -> Vec2 {
+	return {position.x - size.x * pivot[0], position.y - size.y * pivot[1]}
+}
diff --git a/engine/sprite_test.odin b/engine/sprite_test.odin
index a6c6fa9..4135a6a 100644
--- a/engine/sprite_test.odin
+++ b/engine/sprite_test.odin
@@ -19,3 +19,17 @@ to_clip_corners :: proc(t: ^testing.T) {
 	testing.expect_value(t, p[0], f32(0))
 	testing.expect_value(t, p[1], f32(0))
 }
+
+@(test)
+sprite_quad_origin_feet :: proc(t: ^testing.T) {
+	o := sprite_quad_origin({400, 500}, {100, 200}, {0.5, 1.0})
+	testing.expect_value(t, o.x, f32(350))
+	testing.expect_value(t, o.y, f32(300))
+}
+
+@(test)
+sprite_quad_origin_center :: proc(t: ^testing.T) {
+	o := sprite_quad_origin({400, 500}, {100, 200}, {0.5, 0.5})
+	testing.expect_value(t, o.x, f32(350))
+	testing.expect_value(t, o.y, f32(400))
+}