mutable unsigned dirty;
const VertexArray *vertex_array;
VertexFormat vertex_format;
const VertexArray *inst_array;
VertexFormat inst_format;
const Buffer *index_buffer;
mutable unsigned dirty;
const VertexArray *vertex_array;
VertexFormat vertex_format;
const VertexArray *inst_array;
VertexFormat inst_format;
const Buffer *index_buffer;