Added glass and metal objects

Makefile

@@ -13,7 +13,29 @@ $(TARGET): $(SRC)
 run: $(TARGET)
 	./$(TARGET)
 
-clean:
-	rm -f $(TARGET)
+# --- Windows x64 cross-compile (MinGW-w64) ---------------------------------
+# Produces a self-contained vectorgons.exe (statically links GLFW and the
+# GCC/threads runtime; at run time it needs only Windows system DLLs:
+# opengl32, glu32, gdi32, user32, shell32, kernel32). Override WINCC / GLFWDIR
+# for your toolchain and GLFW (https://www.glfw.org/download, WIN64 binaries):
+#   make windows WINCC=x86_64-w64-mingw32-gcc GLFWDIR=/path/to/glfw-3.4.bin.WIN64
+WINCC    ?= x86_64-w64-mingw32-gcc
+GLFWDIR  ?= /tmp/glfw-3.4.bin.WIN64
+WINFLAGS  = -O2 -std=c11 -Wall -Wextra -mwindows -static -s
+WINLIBS   = -lglfw3 -lglu32 -lopengl32 -lgdi32 -luser32 -lshell32
 
-.PHONY: run clean
+windows: $(SRC)
+	$(WINCC) $(WINFLAGS) -I$(GLFWDIR)/include -o $(TARGET).exe $(SRC) \
+	  -L$(GLFWDIR)/lib-mingw-w64 $(WINLIBS)
+
+# Windows screensaver: same code with -DSCREENSAVER, output named .scr.
+# Install by right-clicking the .scr in Windows -> Install (or drop it in
+# C:\Windows\System32 and pick it in Settings > Lock screen > Screen saver).
+screensaver: $(SRC)
+	$(WINCC) $(WINFLAGS) -DSCREENSAVER -I$(GLFWDIR)/include -o $(TARGET).scr $(SRC) \
+	  -L$(GLFWDIR)/lib-mingw-w64 $(WINLIBS)
+
+clean:
+	rm -f $(TARGET) $(TARGET).exe $(TARGET).scr
+
+.PHONY: run windows screensaver clean