glPushMatrix man page on Oracle

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GLPUSHMATRIX(3G)		 OpenGL Manual		      GLPUSHMATRIX(3G)

NAME
       glPushMatrix - push and pop the current matrix stack

C SPECIFICATION
       void glPushMatrix(void);

C SPECIFICATION
       void glPopMatrix(void);

DESCRIPTION
       There is a stack of matrices for each of the matrix modes. In
       GL_MODELVIEW mode, the stack depth is at least 32. In the other modes,
       GL_COLOR, GL_PROJECTION, and GL_TEXTURE, the depth is at least 2. The
       current matrix in any mode is the matrix on the top of the stack for
       that mode.

       glPushMatrix pushes the current matrix stack down by one, duplicating
       the current matrix. That is, after a glPushMatrix call, the matrix on
       top of the stack is identical to the one below it.

       glPopMatrix() pops the current matrix stack, replacing the current
       matrix with the one below it on the stack.

       Initially, each of the stacks contains one matrix, an identity matrix.

       It is an error to push a full matrix stack or to pop a matrix stack
       that contains only a single matrix. In either case, the error flag is
       set and no other change is made to GL state.

ERRORS
       GL_STACK_OVERFLOW is generated if glPushMatrix is called while the
       current matrix stack is full.

       GL_STACK_UNDERFLOW is generated if glPopMatrix() is called while the
       current matrix stack contains only a single matrix.

       GL_INVALID_OPERATION is generated if glPushMatrix or glPopMatrix() is
       executed between the execution of glBegin() and the corresponding
       execution of glEnd().

ASSOCIATED GETS
       glGet() with argument GL_MATRIX_MODE

       glGet() with argument GL_COLOR_MATRIX

       glGet() with argument GL_MODELVIEW_MATRIX

       glGet() with argument GL_PROJECTION_MATRIX

       glGet() with argument GL_TEXTURE_MATRIX

       glGet() with argument GL_COLOR_MATRIX_STACK_DEPTH

       glGet() with argument GL_MODELVIEW_STACK_DEPTH

       glGet() with argument GL_PROJECTION_STACK_DEPTH

       glGet() with argument GL_TEXTURE_STACK_DEPTH

       glGet() with argument GL_MAX_MODELVIEW_STACK_DEPTH

       glGet() with argument GL_MAX_PROJECTION_STACK_DEPTH

       glGet() with argument GL_MAX_TEXTURE_STACK_DEPTH

SEE ALSO
       glFrustum(), glLoadIdentity(), glLoadMatrix(), glLoadTransposeMatrix(),
       glMatrixMode(), glMultMatrix(), glMultTransposeMatrix(), glOrtho(),
       glRotate(), glScale(), glTranslate(), glViewport()

COPYRIGHT
       Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
       under the SGI Free Software B License. For details, see
       http://oss.sgi.com/projects/FreeB/.

AUTHORS
       opengl.org

opengl.org			  04/29/2014		      GLPUSHMATRIX(3G)
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