Table of Contents

**glPushMatrix, glPopMatrix** - push and pop the current matrix stack

void **glPushMatrix**( void )

void **glPopMatrix**( void )

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**,
const(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.

**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**.

**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_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**
**glFrustum(3G)**
,
**glLoadIdentity(3G)**
, **glLoadMatrix(3G)**
, **glMatrixMode(3G)**
, **glMultMatrix(3G)**
,
**glOrtho(3G)**
, **glRotate(3G)**
, **glScale(3G)**
, **glTranslate(3G)**
, **glViewport(3G)**

**Table of Contents**