Grid matrix math fix

src/utils.odin

@@ -289,13 +289,31 @@ rect_get_size :: proc {rect2_get_size, irect2_get_size}
 /// ## LINEAR ALGEBRA ## ///
 matrix3_translate2 :: proc "contextless" (translation: v2) -> mat3 {
 	return {
-		1.0,           0.0,           0.0,
-		0.0,           1.0,           0.0,
-		translation.x, translation.y, 1.0,
+		1.0, 0.0, translation.x,
+		0.0, 1.0, translation.y,
+		0.0, 0.0, 1.0,
 	}
 }
 
-matrix3_transform_v2 :: proc "contextless" (m: mat3, v: v2) -> v2 {
+matrix3_scale2 :: proc "contextless" (scale: v2) -> mat3 {
+	return {
+		scale.x, 0.0,     0.0,
+		0.0,     scale.y, 0.0,
+		0.0,     0.0,     1.0,
+	}
+}
+
+matrix3_rotate2 :: proc "contextless" (ang: f32) -> mat3 {
+	a := linalg.cos(ang)
+	b := linalg.sin(ang)
+	return {
+		a,  b,  0,
+		-b, a,  0,
+		0,  0,  1,
+	}
+}
+
+matrix3_transform_xy :: proc "contextless" (m: mat3, v: v2) -> v2 {
 	return (m * v3{**v, 1.0}).xy
 }