| 1 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1-transitional.dtd"> |
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| 3 | <?xml-stylesheet type="text/xsl" href="mathml.xsl"?><html xmlns="http://www.w3.org/1999/xhtml" xmlns:pref="http://www.w3.org/2002/Math/preference" pref:renderer="mathplayer-dl"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>glPushMatrix</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="glPushMatrix"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glPushMatrix — push and pop the current matrix stack</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">void <b class="fsfunc">glPushMatrix</b>(</code></td><td> </td><td><var class="pdparam">void</var><code>)</code>;</td></tr></table></div></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">void <b class="fsfunc">glPopMatrix</b>(</code></td><td> </td><td><var class="pdparam">void</var><code>)</code>;</td></tr></table></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p> |
| 4 | There is a stack of matrices for each of the matrix modes. |
| 5 | In <code class="constant">GL_MODELVIEW</code> mode, |
| 6 | the stack depth is at least 32. |
| 7 | In the other modes, |
| 8 | <code class="constant">GL_COLOR</code>, <code class="constant">GL_PROJECTION</code>, and <code class="constant">GL_TEXTURE</code>, |
| 9 | the depth is at least 2. |
| 10 | The current matrix in any mode is the matrix on the top of the stack |
| 11 | for that mode. |
| 12 | </p><p> |
| 13 | <code class="function">glPushMatrix</code> pushes the current matrix stack down by one, |
| 14 | duplicating the current matrix. |
| 15 | That is, |
| 16 | after a <code class="function">glPushMatrix</code> call, |
| 17 | the matrix on top of the stack is identical to the one below it. |
| 18 | </p><p> |
| 19 | <a class="citerefentry" href="glPopMatrix.xml"><span class="citerefentry"><span class="refentrytitle">glPopMatrix</span></span></a> pops the current matrix stack, |
| 20 | replacing the current matrix with the one below it on the stack. |
| 21 | </p><p> |
| 22 | Initially, each of the stacks contains one matrix, an identity matrix. |
| 23 | </p><p> |
| 24 | It is an error to push a full matrix stack |
| 25 | or to pop a matrix stack that contains only a single matrix. |
| 26 | In either case, the error flag is set |
| 27 | and no other change is made to GL state. |
| 28 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p> |
| 29 | <code class="constant">GL_STACK_OVERFLOW</code> is generated if <code class="function">glPushMatrix</code> is called while |
| 30 | the current matrix stack is full. |
| 31 | </p><p> |
| 32 | <code class="constant">GL_STACK_UNDERFLOW</code> is generated if <a class="citerefentry" href="glPopMatrix.xml"><span class="citerefentry"><span class="refentrytitle">glPopMatrix</span></span></a> is called while |
| 33 | the current matrix stack contains only a single matrix. |
| 34 | </p><p> |
| 35 | <code class="constant">GL_INVALID_OPERATION</code> is generated if <code class="function">glPushMatrix</code> or <a class="citerefentry" href="glPopMatrix.xml"><span class="citerefentry"><span class="refentrytitle">glPopMatrix</span></span></a> |
| 36 | is executed between the execution of <a class="citerefentry" href="glBegin.xml"><span class="citerefentry"><span class="refentrytitle">glBegin</span></span></a> |
| 37 | and the corresponding execution of <a class="citerefentry" href="glEnd.xml"><span class="citerefentry"><span class="refentrytitle">glEnd</span></span></a>. |
| 38 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="associatedgets"></a><h2>Associated Gets</h2><p> |
| 39 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_MATRIX_MODE</code> |
| 40 | </p><p> |
| 41 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_COLOR_MATRIX</code> |
| 42 | </p><p> |
| 43 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_MODELVIEW_MATRIX</code> |
| 44 | </p><p> |
| 45 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_PROJECTION_MATRIX</code> |
| 46 | </p><p> |
| 47 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_TEXTURE_MATRIX</code> |
| 48 | </p><p> |
| 49 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_COLOR_MATRIX_STACK_DEPTH</code> |
| 50 | </p><p> |
| 51 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_MODELVIEW_STACK_DEPTH</code> |
| 52 | </p><p> |
| 53 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_PROJECTION_STACK_DEPTH</code> |
| 54 | </p><p> |
| 55 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_TEXTURE_STACK_DEPTH</code> |
| 56 | </p><p> |
| 57 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_MAX_MODELVIEW_STACK_DEPTH</code> |
| 58 | </p><p> |
| 59 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_MAX_PROJECTION_STACK_DEPTH</code> |
| 60 | </p><p> |
| 61 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_MAX_TEXTURE_STACK_DEPTH</code> |
| 62 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p> |
| 63 | <a class="citerefentry" href="glFrustum.xml"><span class="citerefentry"><span class="refentrytitle">glFrustum</span></span></a>, |
| 64 | <a class="citerefentry" href="glLoadIdentity.xml"><span class="citerefentry"><span class="refentrytitle">glLoadIdentity</span></span></a>, |
| 65 | <a class="citerefentry" href="glLoadMatrix.xml"><span class="citerefentry"><span class="refentrytitle">glLoadMatrix</span></span></a>, |
| 66 | <a class="citerefentry" href="glLoadTransposeMatrix.xml"><span class="citerefentry"><span class="refentrytitle">glLoadTransposeMatrix</span></span></a>, |
| 67 | <a class="citerefentry" href="glMatrixMode.xml"><span class="citerefentry"><span class="refentrytitle">glMatrixMode</span></span></a>, |
| 68 | <a class="citerefentry" href="glMultMatrix.xml"><span class="citerefentry"><span class="refentrytitle">glMultMatrix</span></span></a>, |
| 69 | <a class="citerefentry" href="glMultTransposeMatrix.xml"><span class="citerefentry"><span class="refentrytitle">glMultTransposeMatrix</span></span></a>, |
| 70 | <a class="citerefentry" href="glOrtho.xml"><span class="citerefentry"><span class="refentrytitle">glOrtho</span></span></a>, |
| 71 | <a class="citerefentry" href="glRotate.xml"><span class="citerefentry"><span class="refentrytitle">glRotate</span></span></a>, |
| 72 | <a class="citerefentry" href="glScale.xml"><span class="citerefentry"><span class="refentrytitle">glScale</span></span></a>, |
| 73 | <a class="citerefentry" href="glTranslate.xml"><span class="citerefentry"><span class="refentrytitle">glTranslate</span></span></a>, |
| 74 | <a class="citerefentry" href="glViewport.xml"><span class="citerefentry"><span class="refentrytitle">glViewport</span></span></a> |
| 75 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p> |
| 76 | Copyright <span class="trademark"></span>© 1991-2006 |
| 77 | Silicon Graphics, Inc. This document is licensed under the SGI |
| 78 | Free Software B License. For details, see |
| 79 | <a class="ulink" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>. |
| 80 | </p></div></div></body></html> |