ported rewrite2 to c3

src/ugui_input.c3

@@ -0,0 +1,78 @@
+module ugui;
+
+import std::io;
+
+// TODO: this could be a bitstruct
+bitstruct InputEvents : uint {
+	bool resize : 0; // window size was changed
+	bool change_focus : 1; // window focus changed
+	bool mouse_move : 2; // mouse was moved
+	bool mouse_btn : 3; // mouse button pressed or released
+}
+
+// Window size was changed
+fn void! Ctx.input_window_size(&ctx, short width, short height)
+{
+	if (width <= 0 || height <= 0) {
+		return UgError.INVALID_SIZE?;
+	}
+	ctx.width = width;
+	ctx.height = height;
+	ctx.input.events.resize = true;
+}
+
+// Window gained/lost focus
+fn void Ctx.input_changefocus(&ctx, bool has_focus)
+{
+	// FIXME: raylib only has an API to query the focus status so we have to
+	//        update the input flag only if the focus changed
+	if (ctx.has_focus != has_focus) {
+		ctx.input.events.change_focus = true;
+	}
+	ctx.has_focus = has_focus;
+}
+
+bitstruct MouseButtons : uint {
+	bool btn_left : 0;
+	bool btn_middle : 1;
+	bool btn_right : 2;
+	bool btn_4 : 3;
+	bool btn_5 : 4;
+}
+
+// Mouse Button moved
+fn void Ctx.input_mouse_button(&ctx, MouseButtons buttons)
+{
+	ctx.input.mouse.updated = ctx.input.mouse.down ^ buttons;
+	ctx.input.mouse.down = buttons;
+	ctx.input.events.mouse_btn = true;
+
+	io::printfn(
+	    "Mouse Down: %s%s%s%s%s",
+	    buttons.btn_left ? "BTN_LEFT " : "",
+	    buttons.btn_right ? "BTN_RIGHT " : "",
+	    buttons.btn_middle ? "BTN_MIDDLE " : "",
+	    buttons.btn_4 ? "BTN_4 " : "",
+	    buttons.btn_5 ? "BTN_5 " : ""
+	);
+}
+
+// Mouse was moved, report absolute position
+// TODO: implement this
+fn void Ctx.input_mouse_abs(&ctx, short x, short y) { return; }
+
+// Mouse was moved, report relative motion
+fn void Ctx.input_mouse_delta(&ctx, short dx, short dy)
+{
+	ctx.input.mouse.delta.x = dx;
+	ctx.input.mouse.delta.y = dy;
+
+	short mx, my;
+	mx = ctx.input.mouse.pos.x + dx;
+	my = ctx.input.mouse.pos.y + dy;
+
+	ctx.input.mouse.pos.x = clamp(mx, 0u16, ctx.width);
+	ctx.input.mouse.pos.y = clamp(my, 0u16, ctx.height);
+
+	ctx.input.events.mouse_move = true;
+}