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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 (C) 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				    06/10/2014				 GLPUSHMATRIX(3G)
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