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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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_define(_filters,eqn)_C_
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_C_ eqn is automatically replaced with neqn for nroff
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_header(GetTexEnv,return texture environment parameters)
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_names(GetTexEnv,[fi]v)
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Specifies a texture environment.
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Must be _const(TEXTURE_ENV).
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Specifies the symbolic name of a texture environment parameter.
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Accepted values are _const(TEXTURE_ENV_MODE) and _const(TEXTURE_ENV_COLOR).
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Returns the requested data.
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_cmnd returns in _param3 selected values of a texture environment that
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was specified with _cmnd(TexEnv).
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_param1 specifies a texture environment.
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Currently, only one texture environment is defined and supported:
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_param2 names a specific texture environment parameter, as follows:
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_const(TEXTURE_ENV_MODE)
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_param3 returns the single-valued texture environment mode,
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a symbolic constant. The initial value is _const(MODULATE).
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_const(TEXTURE_ENV_COLOR)
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_param3 returns four integer or floating-point values that are the
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texture environment color.
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are linearly mapped from the internal floating-point representation
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such that 1.0 maps to the most positive representable integer,
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and \-1.0 maps to the most negative representable integer. The initial
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value is (0, 0, 0, 0).
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If an error is generated,
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no change is made to the contents of _param3.
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When the _arbstring(multitexture) extension is supported, _cmnd returns
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the texture environment parameters for the active texture unit.
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_const(INVALID_ENUM) is generated if _param1 or _param2 is not an
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_const(INVALID_OPERATION) is generated if _cmnd
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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(ActiveTextureARB),