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<h1>math.c File Reference</h1>Converting mathematical structures from Allegro to OpenGL. <a href="#_details">More...</a>
<p>
<code>#include <math.h></code><br>
<code>#include <allegro.h></code><br>
<code>#include "<a class="el" href="alleggl_8h-source.html">alleggl.h</a>"</code><br>
<code>#include "allglint.h"</code><br>
<p>
<a href="math_8c-source.html">Go to the source code of this file.</a><h2>Defines</h2>
<ul>
<li><a class="anchor" name="e71449b1cc6e6250b91f539153a7a0d3"></a><!-- doxytag: member="math.c::M_PI" ref="e71449b1cc6e6250b91f539153a7a0d3" args="" -->
#define <a class="el" href="math_8c.html#e71449b1cc6e6250b91f539153a7a0d3">M_PI</a> 3.14159265358979323846
<li><a class="anchor" name="33706d38f2836132b07580c38541b0ba"></a><!-- doxytag: member="math.c::ALGL_NOCONV" ref="33706d38f2836132b07580c38541b0ba" args="(x)" -->
#define <a class="el" href="math_8c.html#33706d38f2836132b07580c38541b0ba">ALGL_NOCONV</a>(x) x
<li>#define <a class="el" href="math_8c.html#25e8baba5630176200a8cfa8a6fdd1e0">TRANSLATE_AL_TO_GL</a>(al_type, gl_type, convertor)
<li>#define <a class="el" href="math_8c.html#69497b942cb028426171b3ca81bf2598">TRANSLATE_GL_TO_AL</a>(gl_type, al_type, convertor)
<li><a class="anchor" name="779175036d19925ff6aa6469c2926b00"></a><!-- doxytag: member="math.c::RAD_2_DEG" ref="779175036d19925ff6aa6469c2926b00" args="(a)" -->
#define <a class="el" href="math_8c.html#779175036d19925ff6aa6469c2926b00">RAD_2_DEG</a>(a) ((a) * 180 / M_PI)
</ul>
<h2>Functions</h2>
<tr><td colspan="2"><div class="groupHeader">Matrix conversion routines</div></td></tr>
<ul>
<li>void <a class="el" href="group__math.html#g4cf4f453cb3f95a1e7e861a7401b4a8d">allegro_gl_MATRIX_to_GLfloat</a> (MATRIX *m, GLfloat gl[16])
<dl class="el"><dd class="mdescRight">Converts an Allegro fixed-point matrix to an array of floats suitable for OpenGL's matrix operations. <a href="group__math.html#g4cf4f453cb3f95a1e7e861a7401b4a8d"></a><br></dl><li>void <a class="el" href="group__math.html#gee6cb48f8e3e70abecc6c282a8ea1edc">allegro_gl_MATRIX_to_GLdouble</a> (MATRIX *m, GLdouble gl[16])
<dl class="el"><dd class="mdescRight">Converts an Allegro fixed-point matrix to an array of doubles suitable for OpenGL's matrix operations. <a href="group__math.html#gee6cb48f8e3e70abecc6c282a8ea1edc"></a><br></dl><li>void <a class="el" href="group__math.html#ge8e0ee18b9aeca955402be16de6ca79d">allegro_gl_MATRIX_f_to_GLfloat</a> (MATRIX_f *m, GLfloat gl[16])
<dl class="el"><dd class="mdescRight">Converts an Allegro floating-point matrix to an array of floats suitable for OpenGL's matrix operations. <a href="group__math.html#ge8e0ee18b9aeca955402be16de6ca79d"></a><br></dl><li>void <a class="el" href="group__math.html#gb93f3588ea08b048f418023aa76cb3fc">allegro_gl_MATRIX_f_to_GLdouble</a> (MATRIX_f *m, GLdouble gl[16])
<dl class="el"><dd class="mdescRight">Converts an Allegro floating-point matrix to an array of doubles suitable for OpenGL's matrix operations. <a href="group__math.html#gb93f3588ea08b048f418023aa76cb3fc"></a><br></dl><li>void <a class="el" href="group__math.html#g468e83ca4de52ed839978d48f5dbe111">allegro_gl_GLfloat_to_MATRIX</a> (GLfloat gl[16], MATRIX *m)
<dl class="el"><dd class="mdescRight">Converts an OpenGL floating-point matrix issued from the matrix stack to an Allegro fixed-point matrix. <a href="group__math.html#g468e83ca4de52ed839978d48f5dbe111"></a><br></dl><li>void <a class="el" href="group__math.html#g68e2e0e9dcdba42004070a5f8f547994">allegro_gl_GLdouble_to_MATRIX</a> (GLdouble gl[16], MATRIX *m)
<dl class="el"><dd class="mdescRight">Converts an OpenGL double precision floating-point matrix issued from the matrix stack to an Allegro fixed-point matrix. <a href="group__math.html#g68e2e0e9dcdba42004070a5f8f547994"></a><br></dl><li>void <a class="el" href="group__math.html#g08692466ae37d7888bbd5f5ee5aa9268">allegro_gl_GLfloat_to_MATRIX_f</a> (GLfloat gl[16], MATRIX_f *m)
<dl class="el"><dd class="mdescRight">Converts an OpenGL floating-point matrix issued from the matrix stack to an Allegro floating-point matrix. <a href="group__math.html#g08692466ae37d7888bbd5f5ee5aa9268"></a><br></dl><li>void <a class="el" href="group__math.html#ga6b729a9e93e249a8a76e078e94a2b44">allegro_gl_GLdouble_to_MATRIX_f</a> (GLdouble gl[16], MATRIX_f *m)
<dl class="el"><dd class="mdescRight">Converts an OpenGL double precision floating-point matrix issued from the matrix stack to an Allegro single-precision floating-point matrix. <a href="group__math.html#ga6b729a9e93e249a8a76e078e94a2b44"></a><br></dl></ul>
<tr><td colspan="2"><div class="groupHeader">Quaternion conversion routines</div></td></tr>
<ul>
<li>void <a class="el" href="group__math.html#ga83a678516d8a7a5503a2b0c9014cb64">allegro_gl_apply_quat</a> (QUAT *q)
<dl class="el"><dd class="mdescRight">Multiplies the Quaternion to the current transformation matrix, by converting it to a call to glRotatef(). <a href="group__math.html#ga83a678516d8a7a5503a2b0c9014cb64"></a><br></dl><li>void <a class="el" href="group__math.html#gb00b667363181a8f0853121170bebaca">allegro_gl_quat_to_glrotatef</a> (QUAT *q, float *angle, float *x, float *y, float *z)
<dl class="el"><dd class="mdescRight">Converts a quaternion to a vector/angle, which can be used with glRotate*(). <a href="group__math.html#gb00b667363181a8f0853121170bebaca"></a><br></dl><li>void <a class="el" href="group__math.html#g956160418e1c0c37143dd3cee54477ce">allegro_gl_quat_to_glrotated</a> (QUAT *q, double *angle, double *x, double *y, double *z)
<dl class="el"><dd class="mdescRight">Converts a quaternion to a vector/angle, which can be used with glRotate*(). <a href="group__math.html#g956160418e1c0c37143dd3cee54477ce"></a><br></dl></ul>
<hr><a name="_details"></a><h2>Detailed Description</h2>
Converting mathematical structures from Allegro to OpenGL.
<p>
This file provides routines to make Allegro matrices from GL-style matrices, and vice versa. This also provides a QUAT to glRotate converter.<p>
Note that Allegro matrices can only store affine transformations.
<p>
Definition in file <a class="el" href="math_8c-source.html">math.c</a>.<hr><h2>Define Documentation</h2>
<a class="anchor" name="25e8baba5630176200a8cfa8a6fdd1e0"></a><!-- doxytag: member="math.c::TRANSLATE_AL_TO_GL" ref="25e8baba5630176200a8cfa8a6fdd1e0" args="(al_type, gl_type, convertor)" -->
<div class="memitem">
<div class="memproto">
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<td class="memname">#define TRANSLATE_AL_TO_GL </td>
<td>(</td>
<td class="paramtype">al_type, <tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">gl_type, <tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">convertor </td>
<td class="paramname"> </td>
<td> ) </td>
<td width="100%"></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
<b>Value:</b><div class="fragment"><pre class="fragment"><span class="keywordtype">void</span> allegro_gl_##al_type##_to_##gl_type (al_type *m, gl_type gl[16]) \
{ \
<span class="keywordtype">int</span> col, row; \
<span class="keywordflow">for</span> (col = 0; col < 3; col++) \
<span class="keywordflow">for</span> (row = 0; row < 3; row++) \
gl[col*4+row] = convertor (m->v[col][row]); \
for (row = 0; row < 3; row++) \
gl[12+row] = convertor (m->t[row]); \
for (col = 0; col < 3; col++) \
gl[4*col + 3] = 0; \
gl[15] = 1; \
}
</pre></div>
<p>
Definition at line <a class="el" href="math_8c-source.html#l00028">28</a> of file <a class="el" href="math_8c-source.html">math.c</a>.
</div>
</div><p>
<a class="anchor" name="69497b942cb028426171b3ca81bf2598"></a><!-- doxytag: member="math.c::TRANSLATE_GL_TO_AL" ref="69497b942cb028426171b3ca81bf2598" args="(gl_type, al_type, convertor)" -->
<div class="memitem">
<div class="memproto">
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<td class="memname">#define TRANSLATE_GL_TO_AL </td>
<td>(</td>
<td class="paramtype">gl_type, <tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">al_type, <tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">convertor </td>
<td class="paramname"> </td>
<td> ) </td>
<td width="100%"></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
<b>Value:</b><div class="fragment"><pre class="fragment"><span class="keywordtype">void</span> allegro_gl_##gl_type##_to_##al_type (gl_type gl[16], al_type *m) \
{ \
<span class="keywordtype">int</span> col, row; \
<span class="keywordflow">for</span> (col = 0; col < 3; col++) \
<span class="keywordflow">for</span> (row = 0; row < 3; row++) \
m->v[col][row] = convertor (gl[col*4+row]); \
<span class="keywordflow">for</span> (row = 0; row < 3; row++) \
m->t[row] = convertor (gl[12+row]); \
}
</pre></div>
<p>
Definition at line <a class="el" href="math_8c-source.html#l00118">118</a> of file <a class="el" href="math_8c-source.html">math.c</a>.
</div>
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