QSGGeometry does not support GL_UNSIGNED_BYTE as index data

Desktop GL allows three types of indices to be passed to glDrawElements()

• GL_UNSIGNED_INT
• GL_UNSIGNED_SHORT
• GL_UNSIGNED_BYTE

OpenGL ES 2.0 allows only two types:

• GL_UNSIGNED_SHORT
• GL_UNSIGNED_BYTE

On our QSGGeometry class we have code to handle GL_UNSIGEND_SHORT and GL_UNSIGNED_INT, but not GL_UNSIGNED_BYTE. Updates must also be reflected in renderer where the type of the index data is used.