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_C_ License Applicability. Except to the extent portions of this file are
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_C_ made subject to an alternative license as permitted in the SGI Free
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_C_ Software License B, Version 1.1 (the "License"), the contents of this
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_C_ file are subject only to the provisions of the License. You may not use
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_C_ this file except in compliance with the License. You may obtain a copy
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_C_ of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
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_C_ Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
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_C_ http://oss.sgi.com/projects/FreeB
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_C_ Note that, as provided in the License, the Software is distributed on an
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_C_ "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
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_C_ DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
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_C_ CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
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_C_ PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
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_C_ Original Code. The Original Code is: OpenGL Sample Implementation,
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_C_ Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
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_C_ Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
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_C_ Copyright in any portions created by third parties is as indicated
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_C_ elsewhere herein. All Rights Reserved.
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_C_ Additional Notice Provisions: The application programming interfaces
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_C_ established by SGI in conjunction with the Original Code are The
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_C_ OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
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_C_ April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
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_C_ 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
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_C_ Window System(R) (Version 1.3), released October 19, 1998. This software
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_C_ was created using the OpenGL(R) version 1.2.1 Sample Implementation
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_C_ published by SGI, but has not been independently verified as being
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_C_ compliant with the OpenGL(R) version 1.2.1 Specification.
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_C_ The first character in this file must be an '_'!
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_C_ Anything on a line after _C_ is ignored
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_header(PushMatrix,push and pop the current matrix stack)
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There is a stack of matrices for each of the matrix modes.
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In _const(MODELVIEW) mode,
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the stack depth is at least 32.
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_const(COLOR), const(PROJECTION), and _const(TEXTURE),
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the depth is at least 2.
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The current matrix in any mode is the matrix on the top of the stack
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_cmnd pushes the current matrix stack down by one,
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duplicating the current matrix.
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the matrix on top of the stack is identical to the one below it.
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_cmnd(PopMatrix) pops the current matrix stack,
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replacing the current matrix with the one below it on the stack.
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Initially, each of the stacks contains one matrix, an identity matrix.
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It is an error to push a full matrix stack,
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or to pop a matrix stack that contains only a single matrix.
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In either case, the error flag is set
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and no other change is made to GL state.
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_const(STACK_OVERFLOW) is generated if _cmnd(PushMatrix) is called while
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the current matrix stack is full.
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_const(STACK_UNDERFLOW) is generated if _cmnd(PopMatrix) is called while
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the current matrix stack contains only a single matrix.
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_const(INVALID_OPERATION) is generated if _cmnd(PushMatrix) or _cmnd(PopMatrix)
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is executed between the execution of _cmnd(Begin)
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and the corresponding execution of _cmnd(End).
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_cmnd(Get) with argument _const(MATRIX_MODE)
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_cmnd(Get) with argument _const(COLOR_MATRIX)
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_cmnd(Get) with argument _const(MODELVIEW_MATRIX)
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_cmnd(Get) with argument _const(PROJECTION_MATRIX)
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_cmnd(Get) with argument _const(TEXTURE_MATRIX)
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_cmnd(Get) with argument _const(COLOR_STACK_DEPTH)
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_cmnd(Get) with argument _const(MODELVIEW_STACK_DEPTH)
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_cmnd(Get) with argument _const(PROJECTION_STACK_DEPTH)
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_cmnd(Get) with argument _const(TEXTURE_STACK_DEPTH)
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_cmnd(Get) with argument _const(MAX_MODELVIEW_STACK_DEPTH)
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_cmnd(Get) with argument _const(MAX_PROJECTION_STACK_DEPTH)
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_cmnd(Get) with argument _const(MAX_TEXTURE_STACK_DEPTH)