glPushMatrix(3) glPushMatrix(3)

## NAME

glPushMatrix,glPopMatrix- push and pop the current matrix stack

## C SPECIFICATION

voidglPushMatrix( void )

## C SPECIFICATION

voidglPopMatrix( void )

## DESCRIPTION

There is a stack of matrices for each of the matrix modes. InGL_MODELVIEWmode, the stack depth is at least 32. In the other modes,GL_COLOR, const(PROJECTION), andGL_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.glPushMatrixpushes the current matrix stack down by one, duplicating the current matrix. That is, after aglPushMatrixcall, the matrix on top of the stack is identical to the one below it.glPopMatrixpops 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_OVERFLOWis generated ifglPushMatrixis called while the cur- rent matrix stack is full.GL_STACK_UNDERFLOWis generated ifglPopMatrixis called while the cur- rent matrix stack contains only a single matrix.GL_INVALID_OPERATIONis generated ifglPushMatrixorglPopMatrixis executed between the execution ofglBeginand the corresponding execu- tion ofglEnd.

## ASSOCIATED GETS

glGetwith argumentGL_MATRIX_MODEglGetwith argumentGL_COLOR_MATRIXglGetwith argumentGL_MODELVIEW_MATRIXglGetwith argumentGL_PROJECTION_MATRIXglGetwith argumentGL_TEXTURE_MATRIXglGetwith argumentGL_COLOR_STACK_DEPTHglGetwith argumentGL_MODELVIEW_STACK_DEPTHglGetwith argumentGL_PROJECTION_STACK_DEPTHglGetwith argumentGL_TEXTURE_STACK_DEPTHglGetwith argumentGL_MAX_MODELVIEW_STACK_DEPTHglGetwith argumentGL_MAX_PROJECTION_STACK_DEPTHglGetwith argumentGL_MAX_TEXTURE_STACK_DEPTH

## SEE ALSO

glFrustum(3),glLoadIdentity(3),glLoadMatrix(3),glMatrixMode(3),glMultMatrix(3),glOrtho(3),glRotate(3),glScale(3),glTranslate(3),glViewport(3)glPushMatrix(3)

Mac OS X 10.6 - Generated Thu Sep 17 20:20:27 CDT 2009