glGetTexEnv(3G)		       OpenGL Reference		       glGetTexEnv(3G)

NAME    [Toc]    [Back]

     glGetTexEnvfv, glGetTexEnviv - return texture environment parameters

C SPECIFICATION    [Toc]    [Back]

     void glGetTexEnvfv( GLenum	target,
			 GLenum	pname,
			 GLfloat *params )
     void glGetTexEnviv( GLenum	target,
			 GLenum	pname,
			 GLint *params )

PARAMETERS    [Toc]    [Back]

     target  Specifies a texture environment.  Must be GL_TEXTURE_ENV.

     pname   Specifies the symbolic name of a texture environment parameter.
	     Accepted values are GL_TEXTURE_ENV_MODE, GL_TEXTURE_ENV_COLOR,
	     and GL_TEXTURE_ENV_BIAS_SGIX.

     params  Returns the requested data.

DESCRIPTION    [Toc]    [Back]

     glGetTexEnv returns in params selected values of a	texture	environment
     that was specified	with glTexEnv.	target specifies a texture
     environment.  Currently, only one texture environment is defined and
     supported:	 GL_TEXTURE_ENV.

     pname names a specific texture environment	parameter, as follows:

     GL_TEXTURE_ENV_MODE    [Toc]    [Back]
	       params returns the single-valued	texture	environment mode, a
	       symbolic	constant. The initial value is GL_MODULATE.

     GL_TEXTURE_ENV_COLOR    [Toc]    [Back]
	       params returns four integer or floating-point values that are
	       the texture environment color. Integer values, when requested,
	       are linearly mapped from	the internal floating-point
	       representation such that	1.0 maps to the	most positive
	       representable integer, and -1.0 maps to the most	negative
	       representable integer. The initial value	is (0, 0, 0, 0).

     GL_TEXTURE_ENV_BIAS_SGIX    [Toc]    [Back]
	       params returns four integer or floating-point values that are
	       the texture environment bias color.  Integer values are mapped
	       in the same way as those	for GL_TEXTURE_ENV_COLOR.

NOTES    [Toc]    [Back]

     If	an error is generated, no change is made to the	contents of params.






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glGetTexEnv(3G)		       OpenGL Reference		       glGetTexEnv(3G)

ERRORS    [Toc]    [Back]

     GL_INVALID_ENUM is	generated if target or pname is	not an accepted	value.

     GL_INVALID_OPERATION is generated if glGetTexEnv is executed between the
     execution of glBegin and the corresponding	execution of glEnd.

SEE ALSO    [Toc]    [Back]

     glTexEnv


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