draw basic field over player when player is attacking

ffi/gles3-export.c

@@ -13,6 +13,8 @@ unsigned int DYNAMIC_DRAW = GL_DYNAMIC_DRAW;
 // OpenGL functions used below
 void loadGlad() {
   gladLoadGLLoader((GLADloadproc)glfwGetProcAddress);
+  glEnable(GL_BLEND);
+  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 }
 
 void viewport(int width, int height) {