+ void
+ bufferSubData(GLsizeiptr offset, GLsizeiptr length, const void *new_data) {
+ if (offset >= 0 && offset < size && length > 0 && offset + length <= size && new_data) {
+ memcpy((GLubyte *)data + offset, new_data, length);
+ }
+ }
+
+ void
+ getSubData(GLsizeiptr offset, GLsizeiptr length, void *out_data) {
+ if (offset >= 0 && offset < size && length > 0 && offset + length <= size && out_data) {
+ memcpy(out_data, (GLubyte *)data + offset, length);
+ }
+ }