DragonFly On-Line Manual Pages

GLPUSHMATRIX()                                                  GLPUSHMATRIX()

NAME
       glPushMatrix, glPopMatrix - 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 two
       modes, 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_MODELVIEW_MATRIX
       glGet with argument GL_PROJECTION_MATRIX
       glGet with argument GL_TEXTURE_MATRIX
       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, glMatrixMode, glMultMatrix,
       glOrtho, glRotate, glScale, glTranslate, glViewport

                                                                GLPUSHMATRIX()