glPushMatrix(3G) OpenGL Reference 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
GLMODELVIEW mode, the stack depth is at least 32. In the other two
modes, GLPROJECTION and GLTEXTURE, 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
GLSTACKOVERFLOW is generated if glPushMatrix is called while the
current matrix stack is full.
GLSTACKUNDERFLOW is generated if glPopMatrix is called while the
current matrix stack contains only a single matrix.
GLINVALIDOPERATION is generated if glPushMatrix or glPopMatrix is
executed between the execution of glBegin and the corresponding execution
of glEnd.
ASSOCIATED GETS
glGet with argument GLMATRIXMODE
glGet with argument GLMODELVIEWMATRIX
glGet with argument GLPROJECTIONMATRIX
glGet with argument GLTEXTUREMATRIX
glGet with argument GLMODELVIEWSTACKDEPTH
glGet with argument GLPROJECTIONSTACKDEPTH
glGet with argument GLTEXTURESTACKDEPTH
glGet with argument GLMAXMODELVIEWSTACKDEPTH
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glPushMatrix(3G) OpenGL Reference glPushMatrix(3G)
glGet with argument GLMAXPROJECTIONSTACKDEPTH
glGet with argument GLMAXTEXTURESTACKDEPTH
SEE ALSO
glFrustum, glLoadIdentity, glLoadMatrix, glMatrixMode, glMultMatrix,
glOrtho, glRotate, glScale, glTranslate, glViewport
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