1 files changed, 29 insertions, 0 deletions
diff --git a/src/client/render/struct.hh b/src/client/render/struct.hh
new file mode 100644
index 0000000..fd00ffd
--- /dev/null
+++ b/src/client/render/struct.hh
@@ -0,0 +1,29 @@
+#ifndef CLIENT_RENDER_STRUCT_HH_
+#define CLIENT_RENDER_STRUCT_HH_
+
+//#include <client/render/render.hh>
+#include <glm/glm.hpp>
+
+namespace client {
+namespace render {
+
+const glm::ivec2& get_window_size() noexcept; // forward declaration
+
+// Scale takes the range [0, 1] and represents an amount of the screen.
+// Offset is any value that is added after scale.
+struct relative_arg {
+    glm::vec2 extent;
+    glm::vec2 offset;
+
+    glm::vec2 to_vec2() const noexcept {
+        const glm::vec2& window = render::get_window_size();
+        const float x = this->extent.x * window.x + this->offset.x;
+        const float y = this->extent.y * window.y + this->offset.y;
+        return {x, y};
+    }
+};
+
+} // namespace render
+} // namespace client
+
+#endif