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<div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="preprocessor">#include &lt;<a class="code" href="gf__pre_8h.html">gf_pre.h</a>&gt;</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span> </div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="comment">/* External library */</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span> </div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="comment">/* Interface */</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="preprocessor">#include &lt;<a class="code" href="gf__math_8h.html">gf_math.h</a>&gt;</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span> </div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="comment">/* Engine */</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span> </div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="comment">/* Standard */</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="preprocessor">#include &lt;string.h&gt;</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="preprocessor">#include &lt;stdlib.h&gt;</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span><span class="preprocessor">#include &lt;<a class="code" href="math_8h.html">math.h</a>&gt;</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span> </div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"><a class="line" href="gf__math_8h.html#a018423cb05adf480f9c3f28f304d1c47"> 15</a></span><span class="keywordtype">double</span> gf_math_log2(<span class="keywordtype">double</span> x) { <span class="keywordflow">return</span> log(x) / log(2); }</div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span> </div>
<div class="foldopen" id="foldopen00017" data-start="{" data-end="}">
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"><a class="line" href="gf__math_8h.html#a3bd2afc9ff0e67e60afef9fe82553726"> 17</a></span><span class="keywordtype">void</span> gf_math_normalize(<a class="code hl_typedef" href="math_8h.html#a866f43b3ea5386cb9497738f1eec3d88">gf_math_vector_t</a> v) {</div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span> <span class="keywordtype">double</span> x = v[0];</div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span> <span class="keywordtype">double</span> y = v[1];</div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span> <span class="keywordtype">double</span> z = v[2];</div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span> <span class="keywordtype">double</span> length;</div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span> </div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span> x *= x;</div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span> y *= y;</div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span> z *= z;</div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span> </div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> length = sqrt(x + y + z);</div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span> <span class="keywordflow">if</span>(length &gt; 0) {</div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span> length = (double)1 / length;</div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span> } <span class="keywordflow">else</span> {</div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span> length = 0;</div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span> }</div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> v[0] *= length;</div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span> v[1] *= length;</div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> v[2] *= length;</div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span>}</div>
</div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span> </div>
<div class="foldopen" id="foldopen00038" data-start="{" data-end="}">
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"><a class="line" href="gf__math_8h.html#a5438b2f7f1324cdd664f2b823faa1ba6"> 38</a></span><span class="keywordtype">void</span> gf_math_normal(<a class="code hl_typedef" href="math_8h.html#a866f43b3ea5386cb9497738f1eec3d88">gf_math_vector_t</a> r, <a class="code hl_typedef" href="math_8h.html#a866f43b3ea5386cb9497738f1eec3d88">gf_math_vector_t</a> v0, <a class="code hl_typedef" href="math_8h.html#a866f43b3ea5386cb9497738f1eec3d88">gf_math_vector_t</a> v1, <a class="code hl_typedef" href="math_8h.html#a866f43b3ea5386cb9497738f1eec3d88">gf_math_vector_t</a> v2) {</div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> <a class="code hl_typedef" href="math_8h.html#a866f43b3ea5386cb9497738f1eec3d88">gf_math_vector_t</a> tmp0;</div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> <a class="code hl_typedef" href="math_8h.html#a866f43b3ea5386cb9497738f1eec3d88">gf_math_vector_t</a> tmp1;</div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> </div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> gf_math_subtract(tmp0, v1, v0);</div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> gf_math_subtract(tmp1, v2, v0);</div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> </div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> gf_math_multiply(r, tmp0, tmp1);</div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> </div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> gf_math_normalize(r);</div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span>}</div>
</div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> </div>
<div class="foldopen" id="foldopen00050" data-start="{" data-end="}">
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"><a class="line" href="gf__math_8h.html#a9df6d1b30bea0b200582e2873bddd113"> 50</a></span><span class="keywordtype">void</span> gf_math_subtract(<a class="code hl_typedef" href="math_8h.html#a866f43b3ea5386cb9497738f1eec3d88">gf_math_vector_t</a> r, <a class="code hl_typedef" href="math_8h.html#a866f43b3ea5386cb9497738f1eec3d88">gf_math_vector_t</a> v0, <a class="code hl_typedef" href="math_8h.html#a866f43b3ea5386cb9497738f1eec3d88">gf_math_vector_t</a> v1) {</div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> r[0] = v0[0] - v1[0];</div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> r[1] = v0[1] - v1[1];</div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> r[2] = v0[2] - v1[2];</div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span>}</div>
</div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> </div>
<div class="foldopen" id="foldopen00056" data-start="{" data-end="}">
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"><a class="line" href="gf__math_8h.html#a394ebd35e2cddf28c86a45dad759fbee"> 56</a></span><span class="keywordtype">void</span> gf_math_multiply(<a class="code hl_typedef" href="math_8h.html#a866f43b3ea5386cb9497738f1eec3d88">gf_math_vector_t</a> r, <a class="code hl_typedef" href="math_8h.html#a866f43b3ea5386cb9497738f1eec3d88">gf_math_vector_t</a> v0, <a class="code hl_typedef" href="math_8h.html#a866f43b3ea5386cb9497738f1eec3d88">gf_math_vector_t</a> v1) {</div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> r[0] = v0[1] * v1[2] - v0[2] * v1[1];</div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> r[1] = v0[2] * v1[0] - v0[0] * v1[2];</div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> r[2] = v0[0] * v1[1] - v0[1] * v1[0];</div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span>}</div>
</div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> </div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"><a class="line" href="gf__math_8h.html#aac8f6a22f2880f5b86b20a191a662333"> 62</a></span><span class="keywordtype">double</span> gf_math_cot(<span class="keywordtype">double</span> x) { <span class="keywordflow">return</span> (<span class="keywordtype">double</span>)1 / tan(x); }</div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> </div>
<div class="foldopen" id="foldopen00064" data-start="{" data-end="}">
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"><a class="line" href="gf__math_8h.html#aefea2441e869786726095fcda71750dc"> 64</a></span><span class="keywordtype">double</span> gf_math_nearest_2pow(<span class="keywordtype">double</span> x) {</div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> <span class="keywordtype">double</span> l = gf_math_log2(x);</div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> <span class="keywordtype">double</span> r = pow(2, (<span class="keywordtype">int</span>)l);</div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> <span class="keywordflow">if</span>(x == r) {</div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> <span class="keywordflow">return</span> r;</div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> }</div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> <span class="keywordflow">return</span> pow(2, 1 + (<span class="keywordtype">int</span>)l);</div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span>}</div>
</div>
<div class="ttc" id="agf__math_8h_html"><div class="ttname"><a href="gf__math_8h.html">gf_math.h</a></div><div class="ttdoc">Math.</div></div>
<div class="ttc" id="agf__pre_8h_html"><div class="ttname"><a href="gf__pre_8h.html">gf_pre.h</a></div><div class="ttdoc">Required headers before anything.</div></div>
<div class="ttc" id="amath_8h_html"><div class="ttname"><a href="math_8h.html">math.h</a></div><div class="ttdoc">Type definitions related to math.</div></div>
<div class="ttc" id="amath_8h_html_a866f43b3ea5386cb9497738f1eec3d88"><div class="ttname"><a href="math_8h.html#a866f43b3ea5386cb9497738f1eec3d88">gf_math_vector_t</a></div><div class="ttdeci">double gf_math_vector_t[4]</div><div class="ttdoc">Vector.</div><div class="ttdef"><b>Definition</b> <a href="math_8h_source.html#l00025">math.h:25</a></div></div>
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