From 4cb16dfc0b76d2287f73f4d0287cc9635d61c6e8 Mon Sep 17 00:00:00 2001
From: Grant Sanderson <grant@3blue1brown.com>
Date: Mon, 19 Aug 2024 11:28:58 -0500
Subject: [PATCH] Don't apply depth test during winding fill

---
 manimlib/shader_wrapper.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/manimlib/shader_wrapper.py b/manimlib/shader_wrapper.py
index 02373ea0..49f9782e 100644
--- a/manimlib/shader_wrapper.py
+++ b/manimlib/shader_wrapper.py
@@ -378,7 +378,13 @@ class VShaderWrapper(ShaderWrapper):
             gl.GL_ONE_MINUS_DST_ALPHA, gl.GL_ONE,
         )
 
+        # Be sure not to apply depth test while rendering fill
+        # but set it back to where it was after
+        apply_depth_test = bool(gl.glGetBooleanv(gl.GL_DEPTH_TEST))
+        self.ctx.disable(moderngl.DEPTH_TEST)
         self.fill_vao.render()
+        if apply_depth_test:
+            self.ctx.enable(moderngl.DEPTH_TEST)
 
         original_fbo.use()
         gl.glBlendFunc(gl.GL_ONE, gl.GL_ONE_MINUS_SRC_ALPHA)