glGetTexEnvfv man page on YellowDog

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GLGETTEXENV(3G)						       GLGETTEXENV(3G)

NAME
       glGetTexEnvfv, glGetTexEnviv - return texture environment parameters

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

PARAMETERS
       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	   and
	       GL_TEXTURE_ENV_COLOR.

       params  Returns the requested data.

DESCRIPTION
       glGetTexEnv  returns in params selected values of a texture environment
       that was specified with glTexEnv.  target specifies a texture  environ‐
       ment.   Currently,  only	 one  texture  environment is defined and sup‐
       ported: GL_TEXTURE_ENV.

       pname names a specific texture environment parameter, as follows:

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

       GL_TEXTURE_ENV_COLOR
		 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).

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

       When  the  GL_ARB_multitexture  extension  is  supported,   glGetTexEnv
       returns the texture environment parameters for the active texture unit.

ERRORS
       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
       glActiveTextureARB(3G), glTexEnv(3G)

							       GLGETTEXENV(3G)
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