rctx->context.set_constant_buffer = eg_set_constant_buffer;
else if (rctx->screen->use_mem_constant)
rctx->context.set_constant_buffer = r600_set_constant_buffer_mem;
rctx->context.set_constant_buffer = eg_set_constant_buffer;
else if (rctx->screen->use_mem_constant)
rctx->context.set_constant_buffer = r600_set_constant_buffer_mem;