glPushMatrix, glPopMatrix
NAME
glPushMatrix, glPopMatrix -- push and pop the current matrix stack
C SPECIFICATION
void glPushMatrix(void void)
C SPECIFICATION
void glPopMatrix(void 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 the 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 glPopAttrib is called while
the current matrix stack contains only a single matrix.
GL_INVALID_OPERATION is generated if glPushMatrix is called
between a call to glBegin and the
corresponding call to 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
back to the OpenGL index page
© 1995 Uwe Behrens. All rights reserved.