mesa/teximage: add _mesa_is_cube_map_texture utility method

Reviewed-by: Dave Airlie <airlied@redhat.com>

src/mesa/main/teximage.c

@@ -242,6 +242,24 @@ _mesa_is_array_texture(GLenum target)
    };
 }
 
+/**
+ * Test if a target is a cube map.
+ *
+ * \param target texture target.
+ *
+ * \return true if the target is a cube map, false otherwise.
+ */
+bool
+_mesa_is_cube_map_texture(GLenum target)
+{
+   switch(target) {
+   case GL_TEXTURE_CUBE_MAP:
+   case GL_TEXTURE_CUBE_MAP_ARRAY:
+      return true;
+   default:
+      return false;
+   }
+}
 
 /**
  * Return the proxy target which corresponds to the given texture target

src/mesa/main/teximage.h

@@ -256,6 +256,10 @@ _mesa_texture_buffer_range(struct gl_context *ctx,
                            struct gl_buffer_object *bufObj,
                            GLintptr offset, GLsizeiptr size,
                            const char *caller);
+
+bool
+_mesa_is_cube_map_texture(GLenum target);
+
 /*@}*/