GLPUSHMATRIX(3G)

NAME
glPushMatrix - 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, 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_COLOR_MATRIX

glGet() with argument GL_MODELVIEW_MATRIX

glGet() with argument GL_PROJECTION_MATRIX

glGet() with argument GL_TEXTURE_MATRIX

glGet() with argument GL_COLOR_MATRIX_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(), glLoadIdentity(), glLoadMatrix(), glLoadTransposeMatrix(), glMatrixMode(), glMultMatrix(), glMultTransposeMatrix(), glOrtho(), glRotate(), glScale(), glTranslate(), glViewport()

COPYRIGHT

Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.