From 4dfabc1c28d965429a18926028cf8efa63f20711 Mon Sep 17 00:00:00 2001
From: Grant Sanderson <grant@3blue1brown.com>
Date: Wed, 25 Jan 2023 14:20:36 -0800
Subject: [PATCH] Make sure FillShaderWrapper works without a window

---
 manimlib/shader_wrapper.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/manimlib/shader_wrapper.py b/manimlib/shader_wrapper.py
index ac02131e..b7e311b1 100644
--- a/manimlib/shader_wrapper.py
+++ b/manimlib/shader_wrapper.py
@@ -333,10 +333,11 @@ class FillShaderWrapper(ShaderWrapper):
         if not winding:
             vao.render(moderngl.TRIANGLES)
             return
+        original_fbo = self.ctx.fbo
         self.fill_fbo.clear()
         self.fill_fbo.use()
         self.ctx.blend_func = (moderngl.ONE, moderngl.ONE)
         vao.render(self.render_primitive)
         self.ctx.blend_func = moderngl.DEFAULT_BLENDING
-        self.ctx.screen.use()
+        original_fbo.use()
         self.fill_texture_vao.render(moderngl.TRIANGLE_STRIP)