[Fix] (MG_State, MG_Impl, MG_Test): enforce strict GL 3.3 core rules only on contexts that explicitly request a core profile - texture deleted-name reservation keep and VAO-0 draws relax otherwise or under MOBILEGL_RELAXED_SEMANTICS, and GL_CONTEXT_PROFILE_MASK reports the requested profile

MobileGL/MG_State/EGLState/Core.cpp

@@ -764,6 +764,20 @@ namespace MobileGL {
                        ctx->MajorVersion > 3 || (ctx->MajorVersion == 3 && ctx->MinorVersion >= 1);
             }
 
+            Bool EGLContext::IsCurrentContextOpenGLCompatibilityProfile() const {
+                const std::lock_guard<std::recursive_mutex> lock(m_mutex);
+                auto currentIt = m_threadCurrents.find(CurrentThreadKey());
+                if (currentIt == m_threadCurrents.end()) {
+                    return false;
+                }
+                const auto* ctx = TryGetContext(currentIt->second.Context);
+                // Affirmative check: true only when the host explicitly requested the
+                // compatibility bit. Attrib-less contexts report false and thus read as core
+                // for GL_CONTEXT_PROFILE_MASK (EGL defaults 3.x contexts to the core profile).
+                return ctx && ctx->ClientAPI == EGL_OPENGL_API &&
+                       (ctx->OpenGLProfileMask & EGL_CONTEXT_OPENGL_COMPATIBILITY_PROFILE_BIT);
+            }
+
             EGLint EGLContext::GetCurrentContextFlags() const {
                 const std::lock_guard<std::recursive_mutex> lock(m_mutex);
                 auto currentIt = m_threadCurrents.find(CurrentThreadKey());

MobileGL/MG_State/EGLState/Core.h

@@ -59,6 +59,7 @@ namespace MobileGL {
                 Bool ValidateContext(EGLContextHandle context) const;
                 Bool ValidateContextOnDisplay(EGLDisplayHandle display, EGLContextHandle context) const;
                 Bool IsCurrentContextOpenGLCoreProfile() const;
+                Bool IsCurrentContextOpenGLCompatibilityProfile() const;
                 EGLint GetCurrentContextFlags() const;
 
                 // Surface

MobileGL/MG_State/GLState/Core.cpp

@@ -9,6 +9,7 @@
 #include "Core.h"
 #include "MG_State/GLState/RenderbufferState/RenderbufferObject.h"
 #include "MG_State/EGLState/Core.h"
+#include <Config.h>
 
 namespace MobileGL::MG_State {
     void Init() {
@@ -17,6 +18,11 @@ namespace MobileGL::MG_State {
         pEGLContext = MakeUnique<EGLState::EGLContext>();
     }
 
+    Bool IsRelaxedSemanticsActive() {
+        return MG_Config::Features.RelaxedSemantics ||
+               !(pEGLContext && pEGLContext->IsCurrentContextOpenGLCoreProfile());
+    }
+
     namespace GLState {
         // Error
         void GLContext::RecordError(ErrorCode code, UniquePtr<ErrorInfo> info) {
@@ -235,7 +241,7 @@ namespace MobileGL::MG_State {
         }
 
         void GLContext::MarkTextureObjectForDeletion(Uint index) {
-            m_textureState.MarkTextureObjectForDeletion(index);
+            m_textureState.MarkTextureObjectForDeletion(index, IsRelaxedSemanticsActive());
         }
 
         TextureUnit& GLContext::GetTextureUnitObject(Int unit) {

MobileGL/MG_State/GLState/Core.h

@@ -252,5 +252,12 @@ namespace MobileGL {
         } // namespace GLState
 
         extern UniquePtr<GLState::GLContext> pGLContext;
+
+        // True when relaxed GL semantics apply. Strict core rules are enforced only when the
+        // current EGL context explicitly requested a core profile (core bit in
+        // EGL_CONTEXT_OPENGL_PROFILE_MASK, or a >=3.1 version request without the compatibility
+        // bit) and MOBILEGL_RELAXED_SEMANTICS is off; no current context, legacy version
+        // requests, and the compatibility bit all relax.
+        Bool IsRelaxedSemanticsActive();
     } // namespace MG_State
 } // namespace MobileGL

MobileGL/MG_State/GLState/TextureState/TextureState.cpp

@@ -96,7 +96,7 @@ namespace MobileGL::MG_State::GLState {
         return textureObject;
     }
 
-    void TextureState::MarkTextureObjectForDeletion(Uint index) {
+    void TextureState::MarkTextureObjectForDeletion(Uint index, Bool keepUnboundReservation) {
         if (m_indexGenerator.IsValid(index)) {
             auto it = m_textureObjects.find(index);
             if (it != m_textureObjects.end()) {
@@ -123,10 +123,15 @@ namespace MobileGL::MG_State::GLState {
                 BumpTextureBindGeneration();
                 m_textureObjects.erase(index);
                 m_indexGenerator.Delete(index);
+            } else if (!keepUnboundReservation) {
+                // GL 3.3 core 3.8.1 makes a deleted name unused again even when GenTextures only
+                // reserved it and no bind ever instantiated an object (so a later bind of it must
+                // fail), and the reservation has to return to the free list.
+                m_indexGenerator.Delete(index);
             }
-            // Compatibility: legacy Minecraft may delete a generated name before its first bind,
-            // then bind and populate that same name. Keep such a reservation alive; only a real
-            // texture object reaching deletion releases its index above.
+            // Relaxed semantics: legacy apps may delete a generated name before its first
+            // bind, then bind and populate that same name. Keep such a reservation alive there;
+            // a real texture object reaching deletion still releases its index above.
         }
     }
 

MobileGL/MG_State/GLState/TextureState/TextureState.h

@@ -60,7 +60,7 @@ namespace MobileGL::MG_State::GLState {
         const ImageTextureBinding& GetImageTextureBinding(Int unit) const;
         Int GetActiveTextureUnit() const;
         void SetActiveTextureUnit(Int unit);
-        void MarkTextureObjectForDeletion(Uint index);
+        void MarkTextureObjectForDeletion(Uint index, Bool keepUnboundReservation);
         Bool ValidateName(Uint index) const;
         Bool ValidateTextureObject(Uint index) const;