Port 2V0-f window input and UI render command bridge

extension/src/platform/EterLib/UIRenderCommands.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include <cstdint>
+#include <string>
+#include <vector>
+
+// Commands emitted by the 40250 UI drawing calls, consumed by Godot's CanvasItem.
+// The port layer stays independent of godot-cpp.
+struct UIRenderCommand {
+    enum Kind { Bar, Line, Text, Image } kind;
+    float x1, y1, x2, y2;
+    std::uint32_t argb;
+    float clip_x1 = 0, clip_y1 = 0, clip_x2 = 0, clip_y2 = 0;
+    std::string text;
+};
+
+void UIRenderSetSize(int width, int height);
+void UIRenderGetSize(unsigned* width, unsigned* height);
+void UIRenderBeginFrame();
+void UIRenderAdd(UIRenderCommand command);
+const std::vector<UIRenderCommand>& UIRenderCommands();
+void UIRenderSetClip(float x, float y, float width, float height);
+void UIRenderRestoreClip();