glPushMatrix, glPopMatrix — push and pop the current matrix stack

`void ` | `void)` ; |

`void ` | `void)` ; |

There is a stack of matrices for each of the matrix modes. In
`GL_MODELVIEW`

mode, the stack depth is at least 16. In the other 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 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.

Each texture unit has its own texture matrix stack. Use glActiveTexture to select the desired texture matrix stack.

`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.

glGet
with argument `GL_MAX_MODELVIEW_STACK_DEPTH`

glGet
with argument `GL_MAX_PROJECTION_STACK_DEPTH`

glGet
with argument `GL_MAX_TEXTURE_STACK_DEPTH`

glGet
with argument `GL_MAX_TEXTURE_UNITS`

glActiveTexture, glFrustum, glGet, glLoadIdentity, glLoadMatrix, glMatrixMode, glMultMatrix, glOrtho, glRotate, glScale, glTranslate, glViewport

Copyright © 2003-2004 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.