[core] always set activeTexture before binding a texture

1 files changed, 13 insertions, 0 deletions

diff --git a/include/mbgl/gl/gl_values.hpp b/include/mbgl/gl/gl_values.hpp
index a5d413f5af..2ebfe2e687 100644
--- a/include/mbgl/gl/gl_values.hpp
+++ b/include/mbgl/gl/gl_values.hpp
@@ -240,6 +240,19 @@ struct LineWidth {
     }
 };
 
+struct ActiveTexture {
+    using Type = GLint;
+    static const Type Default;
+    inline static void Set(const Type& value) {
+        MBGL_CHECK_ERROR(glActiveTexture(value));
+    }
+    inline static Type Get() {
+        Type activeTexture;
+        MBGL_CHECK_ERROR(glGetIntegerv(GL_ACTIVE_TEXTURE, &activeTexture));
+        return activeTexture;
+    }
+};
+
 #ifndef GL_ES_VERSION_2_0
 
 struct PixelZoom {