From ced7f2889861c143122ec2d9bbed2a2d3a756ecf Mon Sep 17 00:00:00 2001
From: Swung0x48 <swung0x48@outlook.com>
Date: Thu, 2 Jul 2026 14:37:29 +0800
Subject: [PATCH] [Fix] (MG_Impl/GLImpl, MG_State/GLState): reject unlinked
 empty programs [skip ci]

---
 MobileGL/MG_Impl/GLImpl/Program/GL_Program.cpp           | 7 +++++++
 MobileGL/MG_State/GLState/ProgramState/ProgramObject.cpp | 5 +++++
 2 files changed, 12 insertions(+)

diff --git a/MobileGL/MG_Impl/GLImpl/Program/GL_Program.cpp b/MobileGL/MG_Impl/GLImpl/Program/GL_Program.cpp
index 9c66ee06..a5d3a6c4 100644
--- a/MobileGL/MG_Impl/GLImpl/Program/GL_Program.cpp
+++ b/MobileGL/MG_Impl/GLImpl/Program/GL_Program.cpp
@@ -624,6 +624,13 @@ namespace MobileGL::MG_Impl::GLImpl {
 
         auto& programObject = TryToGetProgramObject(program);
         if (!programObject) return;
+        if (!programObject->GetLinkStatus()) {
+            MG_State::pGLContext->RecordError(
+                ErrorCode::InvalidOperation,
+                MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__,
+                                             "program " + std::to_string(program) + " is not linked."));
+            return;
+        }
         MG_State::pGLContext->UseProgram(program);
     }
 
diff --git a/MobileGL/MG_State/GLState/ProgramState/ProgramObject.cpp b/MobileGL/MG_State/GLState/ProgramState/ProgramObject.cpp
index f1a9e16c..a67c82c5 100644
--- a/MobileGL/MG_State/GLState/ProgramState/ProgramObject.cpp
+++ b/MobileGL/MG_State/GLState/ProgramState/ProgramObject.cpp
@@ -171,6 +171,11 @@ namespace MobileGL::MG_State::GLState {
         if (addDefaultFSIfMissingForRenderingPipelineProgram) {
             AddDefaultFragmentShaderIfMissing();
         }
+        if (m_shaders.empty()) {
+            m_infoLog = "No shader objects are attached to program.";
+            MGLOG_E("ProgramObject %u: Link failed - no shader objects attached.", m_externalIndex);
+            return;
+        }
 
         std::sort(m_shaders.begin(), m_shaders.end(),
                   [](const SharedPtr<ShaderObject>& a, const SharedPtr<ShaderObject>& b) {