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<h1>SDL_framerate.c</h1><a href="_s_d_l__framerate_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"></span>
<a name="l00003"></a>00003 <span class="comment">SDL_framerate: framerate manager</span>
<a name="l00004"></a>00004 <span class="comment"></span>
<a name="l00005"></a>00005 <span class="comment">LGPL (c) A. Schiffler</span>
<a name="l00006"></a>00006 <span class="comment"></span>
<a name="l00007"></a>00007 <span class="comment">*/</span>
<a name="l00008"></a>00008 
<a name="l00009"></a>00009 <span class="preprocessor">#include &quot;<a class="code" href="_s_d_l__framerate_8h.html">SDL_framerate.h</a>&quot;</span>
<a name="l00010"></a>00010 
<a name="l00019"></a><a class="code" href="_s_d_l__framerate_8h.html#a3ca69231486837c809fdcbe5b0a10787">00019</a> <span class="keywordtype">void</span> <a class="code" href="_s_d_l__framerate_8c.html#a444ebaaaa6b1ceeafa921562bdab1a44" title="Initialize the framerate manager.">SDL_initFramerate</a>(<a class="code" href="struct_f_p_smanager.html" title="Structure holding the state and timing information of the framerate controller.">FPSmanager</a> * manager)
<a name="l00020"></a>00020 {
<a name="l00021"></a>00021         <span class="comment">/*</span>
<a name="l00022"></a>00022 <span class="comment">        * Store some sane values </span>
<a name="l00023"></a>00023 <span class="comment">        */</span>
<a name="l00024"></a>00024         manager-&gt;<a class="code" href="struct_f_p_smanager.html#a05019faae5de8486dbb69d24b24eed78">framecount</a> = 0;
<a name="l00025"></a>00025         manager-&gt;<a class="code" href="struct_f_p_smanager.html#af7eec7342fd8eb48d5f49ba7f5b91853">rate</a> = <a class="code" href="_s_d_l__framerate_8h.html#ab3ac02e6acb348129a019b9f20aa5c90" title="Default rate of framerate controller in Hz (1/s).">FPS_DEFAULT</a>;
<a name="l00026"></a>00026         manager-&gt;<a class="code" href="struct_f_p_smanager.html#a48695d55d40900a197688bb773b9d431">rateticks</a> = (1000.0f / (float) <a class="code" href="_s_d_l__framerate_8h.html#ab3ac02e6acb348129a019b9f20aa5c90" title="Default rate of framerate controller in Hz (1/s).">FPS_DEFAULT</a>);
<a name="l00027"></a>00027         manager-&gt;<a class="code" href="struct_f_p_smanager.html#aa7716779b7cc57dee24c15d7c5d62e55">lastticks</a> = SDL_GetTicks();
<a name="l00028"></a>00028 }
<a name="l00029"></a>00029 
<a name="l00041"></a><a class="code" href="_s_d_l__framerate_8h.html#a2e3d03ef080b6e2337661992c4b6c208">00041</a> <span class="keywordtype">int</span> <a class="code" href="_s_d_l__framerate_8c.html#a50935c9381b80ec7cce4613f4ac282e8" title="Set the framerate in Hz.">SDL_setFramerate</a>(<a class="code" href="struct_f_p_smanager.html" title="Structure holding the state and timing information of the framerate controller.">FPSmanager</a> * manager, <span class="keywordtype">int</span> rate)
<a name="l00042"></a>00042 {
<a name="l00043"></a>00043         <span class="keywordflow">if</span> ((rate &gt;= <a class="code" href="_s_d_l__framerate_8h.html#a9555dceeaaffdd2669c991e6a300085b" title="Lowest possible rate supported by framerate controller in Hz (1/s).">FPS_LOWER_LIMIT</a>) &amp;&amp; (rate &lt;= <a class="code" href="_s_d_l__framerate_8h.html#aeaeac0f0b439344496e29abf60904d58" title="Highest possible rate supported by framerate controller in Hz (1/s).">FPS_UPPER_LIMIT</a>)) {
<a name="l00044"></a>00044                 manager-&gt;<a class="code" href="struct_f_p_smanager.html#a05019faae5de8486dbb69d24b24eed78">framecount</a> = 0;
<a name="l00045"></a>00045                 manager-&gt;<a class="code" href="struct_f_p_smanager.html#af7eec7342fd8eb48d5f49ba7f5b91853">rate</a> = rate;
<a name="l00046"></a>00046                 manager-&gt;<a class="code" href="struct_f_p_smanager.html#a48695d55d40900a197688bb773b9d431">rateticks</a> = (1000.0f / (float) rate);
<a name="l00047"></a>00047                 <span class="keywordflow">return</span> (0);
<a name="l00048"></a>00048         } <span class="keywordflow">else</span> {
<a name="l00049"></a>00049                 <span class="keywordflow">return</span> (-1);
<a name="l00050"></a>00050         }
<a name="l00051"></a>00051 }
<a name="l00052"></a>00052 
<a name="l00062"></a><a class="code" href="_s_d_l__framerate_8h.html#adeb2ddd02412527aad226ba453a21999">00062</a> <span class="keywordtype">int</span> <a class="code" href="_s_d_l__framerate_8c.html#a575bb511d6f817ad846a788cbd08ae91" title="Return the current target framerate in Hz.">SDL_getFramerate</a>(<a class="code" href="struct_f_p_smanager.html" title="Structure holding the state and timing information of the framerate controller.">FPSmanager</a> * manager)
<a name="l00063"></a>00063 {
<a name="l00064"></a>00064         <span class="keywordflow">if</span> (manager == NULL) {
<a name="l00065"></a>00065                 <span class="keywordflow">return</span> (-1);
<a name="l00066"></a>00066         } <span class="keywordflow">else</span> {
<a name="l00067"></a>00067                 <span class="keywordflow">return</span> (manager-&gt;<a class="code" href="struct_f_p_smanager.html#af7eec7342fd8eb48d5f49ba7f5b91853">rate</a>);
<a name="l00068"></a>00068         }
<a name="l00069"></a>00069 }
<a name="l00070"></a>00070 
<a name="l00081"></a><a class="code" href="_s_d_l__framerate_8h.html#a3f3b7da73f3d92ff82b069b6108aa7ad">00081</a> <span class="keywordtype">int</span> <a class="code" href="_s_d_l__framerate_8c.html#a96b13e26f8436222e866904a592a6eec" title="Return the current framecount.">SDL_getFramecount</a>(<a class="code" href="struct_f_p_smanager.html" title="Structure holding the state and timing information of the framerate controller.">FPSmanager</a> * manager)
<a name="l00082"></a>00082 {
<a name="l00083"></a>00083         <span class="keywordflow">if</span> (manager == NULL) {
<a name="l00084"></a>00084                 <span class="keywordflow">return</span> (-1);
<a name="l00085"></a>00085         } <span class="keywordflow">else</span> {
<a name="l00086"></a>00086                 <span class="keywordflow">return</span> ((Uint32)manager-&gt;<a class="code" href="struct_f_p_smanager.html#a05019faae5de8486dbb69d24b24eed78">framecount</a>);
<a name="l00087"></a>00087         }
<a name="l00088"></a>00088 }
<a name="l00089"></a>00089 
<a name="l00099"></a><a class="code" href="_s_d_l__framerate_8h.html#a5c85c9846e5b0d3abff57480501710a3">00099</a> <span class="keywordtype">void</span> <a class="code" href="_s_d_l__framerate_8c.html#a6170d53a691468b70d73d349a1668291" title="Delay execution to maintain a constant framerate and calculate fps.">SDL_framerateDelay</a>(<a class="code" href="struct_f_p_smanager.html" title="Structure holding the state and timing information of the framerate controller.">FPSmanager</a> * manager)
<a name="l00100"></a>00100 {
<a name="l00101"></a>00101         Uint32 current_ticks;
<a name="l00102"></a>00102         Uint32 target_ticks;
<a name="l00103"></a>00103         Uint32 the_delay;
<a name="l00104"></a>00104 
<a name="l00105"></a>00105         <span class="comment">/*</span>
<a name="l00106"></a>00106 <span class="comment">        * No manager, no delay</span>
<a name="l00107"></a>00107 <span class="comment">        */</span>
<a name="l00108"></a>00108         <span class="keywordflow">if</span> (manager == NULL)
<a name="l00109"></a>00109                 <span class="keywordflow">return</span>;
<a name="l00110"></a>00110 
<a name="l00111"></a>00111         <span class="comment">/*</span>
<a name="l00112"></a>00112 <span class="comment">        * Initialize uninitialized manager </span>
<a name="l00113"></a>00113 <span class="comment">        */</span>
<a name="l00114"></a>00114         <span class="keywordflow">if</span> (manager-&gt;<a class="code" href="struct_f_p_smanager.html#aa7716779b7cc57dee24c15d7c5d62e55">lastticks</a> == 0)
<a name="l00115"></a>00115                 <a class="code" href="_s_d_l__framerate_8c.html#a444ebaaaa6b1ceeafa921562bdab1a44" title="Initialize the framerate manager.">SDL_initFramerate</a>(manager);
<a name="l00116"></a>00116 
<a name="l00117"></a>00117         <span class="comment">/*</span>
<a name="l00118"></a>00118 <span class="comment">        * Next frame </span>
<a name="l00119"></a>00119 <span class="comment">        */</span>
<a name="l00120"></a>00120         manager-&gt;<a class="code" href="struct_f_p_smanager.html#a05019faae5de8486dbb69d24b24eed78">framecount</a>++;
<a name="l00121"></a>00121 
<a name="l00122"></a>00122         <span class="comment">/*</span>
<a name="l00123"></a>00123 <span class="comment">        * Get/calc ticks </span>
<a name="l00124"></a>00124 <span class="comment">        */</span>
<a name="l00125"></a>00125         current_ticks = SDL_GetTicks();
<a name="l00126"></a>00126         target_ticks = manager-&gt;<a class="code" href="struct_f_p_smanager.html#aa7716779b7cc57dee24c15d7c5d62e55">lastticks</a> + (Uint32) ((<span class="keywordtype">float</span>) manager-&gt;<a class="code" href="struct_f_p_smanager.html#a05019faae5de8486dbb69d24b24eed78">framecount</a> * manager-&gt;<a class="code" href="struct_f_p_smanager.html#a48695d55d40900a197688bb773b9d431">rateticks</a>);
<a name="l00127"></a>00127 
<a name="l00128"></a>00128         <span class="keywordflow">if</span> (current_ticks &lt;= target_ticks) {
<a name="l00129"></a>00129                 the_delay = target_ticks - current_ticks;
<a name="l00130"></a>00130                 SDL_Delay(the_delay);
<a name="l00131"></a>00131         } <span class="keywordflow">else</span> {
<a name="l00132"></a>00132                 manager-&gt;<a class="code" href="struct_f_p_smanager.html#a05019faae5de8486dbb69d24b24eed78">framecount</a> = 0;
<a name="l00133"></a>00133                 manager-&gt;<a class="code" href="struct_f_p_smanager.html#aa7716779b7cc57dee24c15d7c5d62e55">lastticks</a> = SDL_GetTicks();
<a name="l00134"></a>00134         }
<a name="l00135"></a>00135 }
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