1 files changed, 14 insertions, 6 deletions
diff --git a/src/o3d/vertex_data.h b/src/o3d/vertex_data.h
index b8ed14c..71f42cd 100644
--- a/src/o3d/vertex_data.h
+++ b/src/o3d/vertex_data.h
@@ -3,14 +3,22 @@
 
 namespace engine::o3d {
 
-class VertexData {
-    public:
-        static VertexData lerp(const VertexData& vd1, const VertexData& vd2, float b0);
-        static VertexData bilerp(const VertexData& vd1, const VertexData& vd2, const VertexData& vd3, float b0, float b1);
+struct VertexData {
+    static constexpr VertexData lerp(const VertexData& vd1, const VertexData& vd2, float b0) {
+        return {
+            b0 * vd1.tx + (1.f - b0) * vd2.tx,
+            b0 * vd1.ty + (1.f - b0) * vd2.ty
+        };
+    }
 
-        float tx, ty;
+    static constexpr VertexData bilerp(const VertexData& vd1, const VertexData& vd2, const VertexData& vd3, float b0, float b1) {
+        return {
+            b0 * vd1.tx + b1 * vd2.tx + (1.f - b0 - b1) * vd3.tx,
+            b0 * vd1.ty + b1 * vd2.ty + (1.f - b0 - b1) * vd3.ty
+        };
+    }
 
-        VertexData(float tx, float ty);
+    float tx, ty;
 };
 
 }