diff --git a/MobileGL/MG_Impl/GLImpl/Program/GL_Program.cpp b/MobileGL/MG_Impl/GLImpl/Program/GL_Program.cpp
index 0e7cea03..508fbfa0 100644
--- a/MobileGL/MG_Impl/GLImpl/Program/GL_Program.cpp
+++ b/MobileGL/MG_Impl/GLImpl/Program/GL_Program.cpp
@@ -140,7 +140,23 @@ namespace MobileGL {
         }
 
         void GetAttachedShaders_State(GLuint program, GLsizei maxCount, GLsizei* count, GLuint* shaders) {
-            THROW_UNIMPL_EXCEPTION;
+            if (maxCount < 0) {
+                MG_State::pGLContext->RecordError(
+                        ErrorCode::InvalidValue,
+                        MakeShared<GenericErrorInfo>("MG_Impl/GLImpl", __func__,
+                                                     "`maxCount` is less than 0."));
+                return;
+            }
+            auto programObject = TryToGetProgramObject(program);
+            if (!programObject)
+                return;
+            const auto& s = programObject->GetAttachedShaders();
+            GLsizei c = std::min((GLsizei)s.size(), maxCount);
+            if (count)
+                *count = c;
+            for (GLsizei i = 0; i < c; ++i) {
+                shaders[i] = s[i]->GetId();
+            }
         }
 
         GLint GetAttribLocation_State(GLuint program, const GLchar* name) {
diff --git a/MobileGL/MG_State/GLState/ProgramState/ProgramObject.cpp b/MobileGL/MG_State/GLState/ProgramState/ProgramObject.cpp
index a82c57a9..db9bc49a 100644
--- a/MobileGL/MG_State/GLState/ProgramState/ProgramObject.cpp
+++ b/MobileGL/MG_State/GLState/ProgramState/ProgramObject.cpp
@@ -59,6 +59,10 @@ namespace MobileGL {
             void ProgramObject::MarkAsDeleted() {
                 m_deleteStatus = true;
             }
+
+            Vector<SharedPtr<ShaderObject>>& ProgramObject::GetAttachedShaders() {
+                return m_shaders;
+            }
         } // namespace GLState
     } // namespace MG_State
 } // namespace MobileGL
\ No newline at end of file
diff --git a/MobileGL/MG_State/GLState/ProgramState/ProgramObject.h b/MobileGL/MG_State/GLState/ProgramState/ProgramObject.h
index 1946707d..a4e5b1b5 100644
--- a/MobileGL/MG_State/GLState/ProgramState/ProgramObject.h
+++ b/MobileGL/MG_State/GLState/ProgramState/ProgramObject.h
@@ -7,12 +7,15 @@ namespace MobileGL {
         namespace GLState {
             class ProgramObject {
             public:
+                ProgramObject(const Uint id): m_id(id) {}
                 bool ShaderIsAttached(SharedPtr<ShaderObject> shader);
                 bool AttachShader(SharedPtr<ShaderObject> shader);
                 SizeT DetachShader(SharedPtr<ShaderObject> shader);
                 void Link();
                 void MarkAsDeleted();
+                Vector<SharedPtr<ShaderObject>>& GetAttachedShaders();
             private:
+                const Uint m_id = 0;
                 Vector<SharedPtr<ShaderObject>> m_shaders;
                 // basically this contains SPIR-V in binary format
                 Vector<Vector<Uint>> m_programBinary;
diff --git a/MobileGL/MG_State/GLState/ProgramState/ProgramState.cpp b/MobileGL/MG_State/GLState/ProgramState/ProgramState.cpp
index 6f290128..fb7f22eb 100644
--- a/MobileGL/MG_State/GLState/ProgramState/ProgramState.cpp
+++ b/MobileGL/MG_State/GLState/ProgramState/ProgramState.cpp
@@ -7,7 +7,7 @@ namespace MobileGL {
                 Uint programId = 0;
                 m_programIndexGenerator.Generate(1, &programId);
                 EnsureIndexAvail(programId, m_programObjects);
-                auto programObject = MakeShared<ProgramObject>();
+                auto programObject = MakeShared<ProgramObject>(programId);
                 if (programObject == nullptr)
                     return 0;
                 m_programObjects[programId] = programObject;
@@ -45,7 +45,7 @@ namespace MobileGL {
                 Uint shaderId = 0;
                 m_shaderIndexGenerator.Generate(1, &shaderId);
                 EnsureIndexAvail(shaderId, m_shaderObjects);
-                auto shaderObject = MakeShared<ShaderObject>(stage);
+                auto shaderObject = MakeShared<ShaderObject>(stage, shaderId);
                 if (shaderObject == nullptr)
                     return 0;
                 m_shaderObjects[shaderId] = shaderObject;
diff --git a/MobileGL/MG_State/GLState/ProgramState/ShaderObject.h b/MobileGL/MG_State/GLState/ProgramState/ShaderObject.h
index 3d14af78..271c7939 100644
--- a/MobileGL/MG_State/GLState/ProgramState/ShaderObject.h
+++ b/MobileGL/MG_State/GLState/ProgramState/ShaderObject.h
@@ -56,16 +56,18 @@ namespace MobileGL {
 
             class ShaderObject {
             public:
-                ShaderObject(const ShaderStage stage) : m_stage(stage) {}
+                ShaderObject(const ShaderStage stage, const Uint id) : m_stage(stage), m_id(id) {}
                 void SetShaderSource(const std::string& source);
                 void SetShaderSource(std::string&& source);
                 void Compile();
                 void MarkAsDeleted();
 
+                Uint GetId() const { return m_id; }
                 ShaderStage GetShaderStage() const { return m_stage; }
                 const std::string& GetShaderSource() const { return m_source; }
                 SharedPtr<glslang::TShader> GetCompiledShader() const { return m_shader; }
             private:
+                const Uint m_id = 0;
                 const ShaderStage m_stage;
                 std::string m_source;
                 SharedPtr<glslang::TShader> m_shader;