diff --git a/include/bgfx/bgfxdefines.h b/include/bgfx/bgfxdefines.h
index 541fbc827..216210b1a 100644
--- a/include/bgfx/bgfxdefines.h
+++ b/include/bgfx/bgfxdefines.h
@@ -6,7 +6,7 @@
 #ifndef BGFX_DEFINES_H_HEADER_GUARD
 #define BGFX_DEFINES_H_HEADER_GUARD
 
-#define BGFX_API_VERSION UINT32_C(3)
+#define BGFX_API_VERSION UINT32_C(4)
 
 ///
 #define BGFX_STATE_RGB_WRITE             UINT64_C(0x0000000000000001) //!< Enable RGB write.
diff --git a/include/bgfx/bgfxplatform.h b/include/bgfx/bgfxplatform.h
index aa8088d2a..ddd4b1d07 100644
--- a/include/bgfx/bgfxplatform.h
+++ b/include/bgfx/bgfxplatform.h
@@ -60,14 +60,20 @@ namespace bgfx
 	///
 	void setPlatformData(const PlatformData& _data);
 
+	/// Internal data.
+	///
+	/// @attention C99 equivalent is `bgfx_internal_data_t`.
 	///
 	struct InternalData
 	{
-		void* context; //!< GL context, or D3D device.
+		const struct Caps* caps; //!< Renderer capabilities.
+		void* context;           //!< GL context, or D3D device.
 	};
 
 	/// Get internal data for interop.
 	///
+	/// @warning Must be called only on render thread.
+	///
 	/// @attention C99 equivalent is `bgfx_get_internal_data`.
 	///
 	const InternalData* getInternalData();
diff --git a/include/bgfx/c99/bgfxplatform.h b/include/bgfx/c99/bgfxplatform.h
index 06a0f6ed4..df79da8f6 100644
--- a/include/bgfx/c99/bgfxplatform.h
+++ b/include/bgfx/c99/bgfxplatform.h
@@ -45,6 +45,7 @@ BGFX_C_API void bgfx_set_platform_data(const bgfx_platform_data_t* _data);
 
 typedef struct bgfx_internal_data
 {
+	const struct bgfx_caps* caps;
     void* context;
 
 } bgfx_internal_data_t;
diff --git a/src/bgfx.cpp b/src/bgfx.cpp
index abd00ee26..1a00f680e 100644
--- a/src/bgfx.cpp
+++ b/src/bgfx.cpp
@@ -310,6 +310,7 @@ namespace bgfx
 
 	const InternalData* getInternalData()
 	{
+		BGFX_CHECK_RENDER_THREAD();
 		return &g_internalData;
 	}
 
@@ -1223,6 +1224,8 @@ namespace bgfx
 			frame();
 		}
 
+		g_internalData.caps = getCaps();
+
 		return true;
 	}
 
@@ -1269,6 +1272,7 @@ namespace bgfx
 		m_render->destroy();
 #endif // BGFX_CONFIG_MULTITHREADED
 
+		memset(&g_internalData, 0, sizeof(InternalData) );
 		s_ctx = NULL;
 
 		m_submit->destroy();
@@ -3510,6 +3514,7 @@ BX_STATIC_ASSERT(sizeof(bgfx::InstanceDataBuffer)    == sizeof(bgfx_instance_dat
 BX_STATIC_ASSERT(sizeof(bgfx::TextureInfo)           == sizeof(bgfx_texture_info_t) );
 BX_STATIC_ASSERT(sizeof(bgfx::Caps)                  == sizeof(bgfx_caps_t) );
 BX_STATIC_ASSERT(sizeof(bgfx::PlatformData)          == sizeof(bgfx_platform_data_t) );
+BX_STATIC_ASSERT(sizeof(bgfx::InternalData)          == sizeof(bgfx_internal_data_t) );
 
 namespace bgfx
 {