GLPUSHMATRIX(3G) UNIX Programmer's Manual GLPUSHMATRIX(3G)
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 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 identi-
cal 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 iden-
tity 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
MirBSD #10-current Printed 2021-12-07 1
GLPUSHMATRIX(3G) UNIX Programmer's Manual GLPUSHMATRIX(3G)
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
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(3G), glLoadIdentity(3G), glLoadMatrix(3G),
glMatrixMode(3G), glMultMatrix(3G), glOrtho(3G),
glRotate(3G), glScale(3G), glTranslate(3G), glViewport(3G)
MirBSD #10-current Printed 2021-12-07 2