[Feat] (MG_Util/BackendLoaders/OpenGL, MG_Impl/Getter): retrieve real GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT from backend

MobileGL/MG_Impl/GLImpl/Getter/GL_Getter.cpp

@@ -18,6 +18,7 @@
 #include <MG_State/GLState/FramebufferState/FramebufferObject.h>
 #if MOBILEGL_BACKEND == MOBILEGL_BACKEND_TYPE_DIRECT_GLES
 #include <MG_Backend/DirectGLES/DirectGLES.h>
+#include "MG_Util/BackendLoaders/OpenGL/Loader.h"
 #endif
 
 namespace MobileGL {
@@ -817,7 +818,11 @@ namespace MobileGL {
                 *params = 0; // TODO
                 break;
             case GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT:
-                *params = 256; // TODO: get real value from backend
+#if MOBILEGL_BACKEND == MOBILEGL_BACKEND_TYPE_DIRECT_GLES
+                *params = MG_External::GLES::g_glesCaps.uniformBufferOffsetAlignment; // TODO: get real value from backend
+#else
+                *params = 256;
+#endif
                 break;
             case GL_UNIFORM_BUFFER_SIZE:
                 *params = 0; // TODO

MobileGL/MG_Util/BackendLoaders/OpenGL/Loader.cpp

@@ -529,6 +529,10 @@ namespace MobileGL {
                         }
                     }
                 }
+
+                MGLOG_I("OpenGL ES capabilities:");
+                MG_External::GLES::glGetIntegerv(GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT, &MG_External::GLES::g_glesCaps.uniformBufferOffsetAlignment);
+                MGLOG_I("    GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT: %d", MG_External::GLES::g_glesCaps.uniformBufferOffsetAlignment);
             }
 
             void InitGLES() {

MobileGL/MG_Util/BackendLoaders/OpenGL/Loader.h

@@ -576,6 +576,8 @@ namespace MobileGL {
                     Version version;
                     Bool hasPersistentMapping;
                     Bool hasNorm16Texture;
+
+                    Int uniformBufferOffsetAlignment;
                 };
             } // namespace Caps