From 1a9f546309980c85572a90fe74e1435da25785da Mon Sep 17 00:00:00 2001
From: BZLZHH <admin@bzlzhh.top>
Date: Sat, 29 Nov 2025 14:26:01 +0800
Subject: [PATCH] [Feat] (MG_Util/BackendLoaders): Detect buffer storage
 extension.

---
 MobileGL/MG_Backend/Init.cpp                  |  4 ++--
 .../MG_Util/BackendLoaders/OpenGL/Loader.cpp  | 19 ++++++++++++++-----
 .../MG_Util/BackendLoaders/OpenGL/Loader.h    |  9 +++++++--
 3 files changed, 23 insertions(+), 9 deletions(-)

diff --git a/MobileGL/MG_Backend/Init.cpp b/MobileGL/MG_Backend/Init.cpp
index 19b3ec0c..82adf1fa 100644
--- a/MobileGL/MG_Backend/Init.cpp
+++ b/MobileGL/MG_Backend/Init.cpp
@@ -39,8 +39,8 @@ namespace MobileGL {
             MGLOG_D("Diligent Engine backend loaded");
 #elif MOBILEGL_BACKEND == MOBILEGL_BACKEND_TYPE_DIRECT_GLES
             MG_Util::BackendLoader::GLES::Init();
-            MGLOG_D("DirectGLES backend loaded, GLES version: %d.%d", MG_External::GLES::Caps::GLESVersion.Major,
-                    MG_External::GLES::Caps::GLESVersion.Minor);
+            MGLOG_D("DirectGLES backend loaded, GLES version: %d.%d", MG_External::GLES::g_glesCaps.version.Major,
+                    MG_External::GLES::g_glesCaps.version.Minor);
 #else
             MGLOG_W("Unknown backend, skipping backend initialization");
 #endif
diff --git a/MobileGL/MG_Util/BackendLoaders/OpenGL/Loader.cpp b/MobileGL/MG_Util/BackendLoaders/OpenGL/Loader.cpp
index 3ad17aa6..c9132f50 100644
--- a/MobileGL/MG_Util/BackendLoaders/OpenGL/Loader.cpp
+++ b/MobileGL/MG_Util/BackendLoaders/OpenGL/Loader.cpp
@@ -6,9 +6,7 @@
 namespace MobileGL {
     namespace MG_External {
         namespace GLES {
-            namespace Caps {
-                Version GLESVersion;
-            }
+            Caps::GLESCaps g_glesCaps;
 
             GL_FUNC_DECL(glActiveTexture)
             GL_FUNC_DECL(glAttachShader)
@@ -485,8 +483,19 @@ namespace MobileGL {
             }
 
             void InitGLESCapabilities() {
-                MG_External::GLES::glGetIntegerv(GL_MAJOR_VERSION, &MG_External::GLES::Caps::GLESVersion.Major);
-                MG_External::GLES::glGetIntegerv(GL_MINOR_VERSION, &MG_External::GLES::Caps::GLESVersion.Minor);
+                MG_External::GLES::glGetIntegerv(GL_MAJOR_VERSION, &MG_External::GLES::g_glesCaps.version.Major);
+                MG_External::GLES::glGetIntegerv(GL_MINOR_VERSION, &MG_External::GLES::g_glesCaps.version.Minor);
+
+                GLint extCount = 0;
+                MG_External::GLES::glGetIntegerv(GL_NUM_EXTENSIONS, &extCount);
+                for (GLint i = 0; i < extCount; ++i) {
+                    const char* extension = (const char*)MG_External::GLES::glGetStringi(GL_EXTENSIONS, i);
+                    if (extension) {
+                        if (std::strcmp(extension, "GL_EXT_buffer_storage") == 0) {
+                            MG_External::GLES::g_glesCaps.hasPersistentMapping = true;
+                        }
+                    }
+                }
             }
 
             void InitGLES() {
diff --git a/MobileGL/MG_Util/BackendLoaders/OpenGL/Loader.h b/MobileGL/MG_Util/BackendLoaders/OpenGL/Loader.h
index b5f1a929..de3a0c10 100644
--- a/MobileGL/MG_Util/BackendLoaders/OpenGL/Loader.h
+++ b/MobileGL/MG_Util/BackendLoaders/OpenGL/Loader.h
@@ -547,8 +547,13 @@ namespace MobileGL {
 
         namespace GLES {
             namespace Caps {
-                extern Version GLESVersion;
-            }
+                struct GLESCaps {
+                    Version version;
+                    Bool hasPersistentMapping;
+                };
+            } // namespace Caps
+
+            extern Caps::GLESCaps g_glesCaps;
 
             GL_FUNC_DECL(glActiveTexture)
             GL_FUNC_DECL(glAttachShader)