glPushMatrix(3G)	       OpenGL Reference		      glPushMatrix(3G)

NAME    [Toc]    [Back]

     glPushMatrix, glPopMatrix - push and pop the current matrix stack

C SPECIFICATION    [Toc]    [Back]

     void glPushMatrix(	void )

C SPECIFICATION    [Toc]    [Back]

     void glPopMatrix( void )

DESCRIPTION    [Toc]    [Back]

     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, const(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    [Toc]    [Back]

     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    [Toc]    [Back]

     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_STACK_DEPTH
     glGet with	argument GL_MODELVIEW_STACK_DEPTH
     glGet with	argument GL_PROJECTION_STACK_DEPTH



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glPushMatrix(3G)	       OpenGL Reference		      glPushMatrix(3G)



     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    [Toc]    [Back]

     glFrustum,	glLoadIdentity,	glLoadMatrix, glMatrixMode, glMultMatrix,
     glOrtho, glRotate,	glScale, glTranslate, glViewport


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