+ context_t *ctx = ¤t_context;
+ timer_query_t *timer;
+ monitor_t *monitor;
+ int i;
+
+ /* Create new timer query, add to list */
+ timer = xmalloc (sizeof (timer_query_t));
+
+ timer->op = ctx->op;
+ timer->next = NULL;
+
+ if (ctx->timer_tail) {
+ ctx->timer_tail->next = timer;
+ ctx->timer_tail = timer;
+ } else {
+ ctx->timer_tail = timer;
+ ctx->timer_head = timer;
+ }
+
+ /* Create a new performance-monitor query */
+ monitor = xmalloc (sizeof (monitor_t));
+
+ monitor->op = ctx->op;
+ monitor->next = NULL;
+
+ if (ctx->monitor_tail) {
+ ctx->monitor_tail->next = monitor;
+ ctx->monitor_tail = monitor;
+ } else {
+ ctx->monitor_tail = monitor;
+ ctx->monitor_head = monitor;
+ }
+
+ /* Initialize the timer_query and monitor objects */
+ glGenQueries (1, &timer->id);
+
+ glGenPerfMonitorsAMD (1, &monitor->id);
+
+ for (i = 0; i < ctx->metrics_info.num_groups; i++)
+ {
+ counter_group_info_t *group;
+ int num_counters;
+
+ group = &ctx->metrics_info.groups[i];
+
+ num_counters = group->num_counters;
+ if (group->max_active_counters < group->num_counters)
+ {
+ fprintf (stderr, "Warning: Only monitoring %d/%d counters from group %d\n",
+ group->max_active_counters,
+ group->num_counters, i);
+ num_counters = group->max_active_counters;
+
+ }
+
+ glSelectPerfMonitorCountersAMD(monitor->id,
+ GL_TRUE, group->id,
+ num_counters,
+ group->counters);
+ }
+
+ /* Start the queries */
+ glBeginQuery (GL_TIME_ELAPSED, timer->id);
+
+ glBeginPerfMonitorAMD (monitor->id);