src/gallium/auxiliary/hud/hud_fps.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2013 Marek Olšák <maraeo@gmail.com>
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL THE AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 /* This file contains code for calculating framerate for displaying on the HUD.
  29  */
  30
  31 #include "hud/hud_private.h"
  32 #include "os/os_time.h"
  33 #include "util/u_memory.h"
  34
  35 struct fps_info {
  36    int frames;
  37    uint64_t last_time;
  38 };
  39
  40 static void
  41 query_fps(struct hud_graph *gr)
  42 {
  43    struct fps_info *info = gr->query_data;
  44    uint64_t now = os_time_get();
  45
  46    info->frames++;
  47
  48    if (info->last_time) {
  49       if (info->last_time + gr->pane->period <= now) {
  50          double fps = ((uint64_t)info->frames) * 1000000 /
  51                       (double)(now - info->last_time);
  52          info->frames = 0;
  53          info->last_time = now;
  54
  55          hud_graph_add_value(gr, fps);
  56       }
  57    }
  58    else {
  59       info->last_time = now;
  60    }
  61 }
  62
  63 static void
  64 free_query_data(void *p)
  65 {
  66    FREE(p);
  67 }
  68
  69 void
  70 hud_fps_graph_install(struct hud_pane *pane)
  71 {
  72    struct hud_graph *gr = CALLOC_STRUCT(hud_graph);
  73
  74    if (!gr)
  75       return;
  76
  77    strcpy(gr->name, "fps");
  78    gr->query_data = CALLOC_STRUCT(fps_info);
  79    if (!gr->query_data) {
  80       FREE(gr);
  81       return;
  82    }
  83
  84    gr->query_new_value = query_fps;
  85
  86    /* Don't use free() as our callback as that messes up Gallium's
  87     * memory debugger.  Use simple free_query_data() wrapper.
  88     */
  89    gr->free_query_data = free_query_data;
  90
  91    hud_pane_add_graph(pane, gr);
  92 }