From 2a73f779c39e7e4c8ef0bbbc3bbc2c1f9cc9182a Mon Sep 17 00:00:00 2001
From: Undefine <undefine@undefine.pl>
Date: Wed, 5 Nov 2025 22:34:17 +0100
Subject: [PATCH] LibWeb: Small WebGL spec fix for vertexAttribPointer

---
 Libraries/LibWeb/WebGL/WebGLRenderingContextImpl.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Libraries/LibWeb/WebGL/WebGLRenderingContextImpl.cpp b/Libraries/LibWeb/WebGL/WebGLRenderingContextImpl.cpp
index 9734ebced9f..13dc9a0de44 100644
--- a/Libraries/LibWeb/WebGL/WebGLRenderingContextImpl.cpp
+++ b/Libraries/LibWeb/WebGL/WebGLRenderingContextImpl.cpp
@@ -2206,6 +2206,12 @@ void WebGLRenderingContextImpl::vertex_attrib_pointer(WebIDL::UnsignedLong index
 {
     m_context->make_current();
 
+    // If no WebGLBuffer is bound to the ARRAY_BUFFER target and offset is non-zero, an INVALID_OPERATION error will be generated.
+    if (!m_array_buffer_binding && offset != 0) {
+        set_error(GL_INVALID_OPERATION);
+        return;
+    }
+
     glVertexAttribPointer(index, size, type, normalized, stride, reinterpret_cast<void*>(offset));
 }