gallium: implement a heads-up display module

Reviewed-by: Brian Paul <[email protected]>

v2: lots of cosmetic changes

1 files changed, 81 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/hud/hud_fps.c b/src/gallium/auxiliary/hud/hud_fps.c
new file mode 100644
index 00000000000..71cdfd04ee7
--- /dev/null
+++ b/src/gallium/auxiliary/hud/hud_fps.c
@@ -0,0 +1,81 @@
+/**************************************************************************
+ *
+ * Copyright 2013 Marek Olšák <[email protected]>
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+/* This file contains code for calculating framerate for displaying on the HUD.
+ */
+
+#include "hud/hud_private.h"
+#include "os/os_time.h"
+#include "util/u_memory.h"
+
+struct fps_info {
+   int frames;
+   uint64_t last_time;
+};
+
+static void
+query_fps(struct hud_graph *gr)
+{
+   struct fps_info *info = gr->query_data;
+   uint64_t now = os_time_get();
+
+   info->frames++;
+
+   if (info->last_time) {
+      if (info->last_time + gr->pane->period <= now) {
+         double fps = info->frames * 1000000 / (double)(now - info->last_time);
+         info->frames = 0;
+         info->last_time = now;
+
+         hud_graph_add_value(gr, fps);
+      }
+   }
+   else {
+      info->last_time = now;
+   }
+}
+
+void
+hud_fps_graph_install(struct hud_pane *pane)
+{
+   struct hud_graph *gr = CALLOC_STRUCT(hud_graph);
+
+   if (!gr)
+      return;
+
+   strcpy(gr->name, "fps");
+   gr->query_data = CALLOC_STRUCT(fps_info);
+   if (!gr->query_data) {
+      FREE(gr);
+      return;
+   }
+
+   gr->query_new_value = query_fps;
+   gr->free_query_data = free;
+
+   hud_pane_add_graph(pane, gr);
+}