From 59998ff0b297d614274068c2e08158a4169ec64f Mon Sep 17 00:00:00 2001
From: Stephan Unverwerth <s.unverwerth@serenityos.org>
Date: Mon, 16 Aug 2021 18:22:06 +0200
Subject: [PATCH] LibGL: Return white texel when sampling uninitialized texture

---
 Userland/Libraries/LibGL/Tex/MipMap.h      | 4 ++--
 Userland/Libraries/LibGL/Tex/Sampler2D.cpp | 3 +++
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/Userland/Libraries/LibGL/Tex/MipMap.h b/Userland/Libraries/LibGL/Tex/MipMap.h
index b8f365a916..01bfd02397 100644
--- a/Userland/Libraries/LibGL/Tex/MipMap.h
+++ b/Userland/Libraries/LibGL/Tex/MipMap.h
@@ -42,8 +42,8 @@ public:
     }
 
 private:
-    GLsizei m_width;
-    GLsizei m_height;
+    GLsizei m_width { 0 };
+    GLsizei m_height { 0 };
     Vector<u32> m_pixel_data;
 };
 }
diff --git a/Userland/Libraries/LibGL/Tex/Sampler2D.cpp b/Userland/Libraries/LibGL/Tex/Sampler2D.cpp
index 5ab81aea00..d72fc0fe82 100644
--- a/Userland/Libraries/LibGL/Tex/Sampler2D.cpp
+++ b/Userland/Libraries/LibGL/Tex/Sampler2D.cpp
@@ -57,6 +57,9 @@ FloatVector4 Sampler2D::sample(FloatVector2 const& uv) const
 
     MipMap const& mip = m_texture.mipmap(lod);
 
+    if (mip.width() < 1 || mip.height() < 1)
+        return { 1, 1, 1, 1 };
+
     float x = wrap(uv.x(), m_wrap_t_mode);
     float y = wrap(uv.y(), m_wrap_s_mode);