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GLGETTEXENV(3G)			 OpenGL Manual		       GLGETTEXENV(3G)

NAME
       glGetTexEnv - 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. May be GL_TEXTURE_ENV,
	   GL_TEXTURE_FILTER_CONTROL, or GL_POINT_SPRITE.

       pname
	   Specifies the symbolic name of a texture environment parameter.
	   Accepted values are GL_TEXTURE_ENV_MODE, GL_TEXTURE_ENV_COLOR,
	   GL_TEXTURE_LOD_BIAS, GL_COMBINE_RGB, GL_COMBINE_ALPHA, GL_SRC0_RGB,
	   GL_SRC1_RGB, GL_SRC2_RGB, GL_SRC0_ALPHA, GL_SRC1_ALPHA,
	   GL_SRC2_ALPHA, GL_OPERAND0_RGB, GL_OPERAND1_RGB, GL_OPERAND2_RGB,
	   GL_OPERAND0_ALPHA, GL_OPERAND1_ALPHA, GL_OPERAND2_ALPHA,
	   GL_RGB_SCALE, GL_ALPHA_SCALE, or GL_COORD_REPLACE.

       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
       environment.

       When target is GL_TEXTURE_FILTER_CONTROL, pname must be
       GL_TEXTURE_LOD_BIAS. When target is GL_POINT_SPRITE, pname must be
       GL_COORD_REPLACE. When target is GL_TEXTURE_ENV, pname can be
       GL_TEXTURE_ENV_MODE, GL_TEXTURE_ENV_COLOR, GL_COMBINE_RGB,
       GL_COMBINE_ALPHA, GL_RGB_SCALE, GL_ALPHA_SCALE, GL_SRC0_RGB,
       GL_SRC1_RGB, GL_SRC2_RGB, GL_SRC0_ALPHA, GL_SRC1_ALPHA, or
       GL_SRC2_ALPHA.

       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).

       GL_TEXTURE_LOD_BIAS

	   params returns a single floating-point value that is the texture
	   level-of-detail bias. The initial value is 0.

       GL_COMBINE_RGB

	   params returns a single symbolic constant value representing the
	   current RGB combine mode. The initial value is GL_MODULATE.

       GL_COMBINE_ALPHA

	   params returns a single symbolic constant value representing the
	   current alpha combine mode. The initial value is GL_MODULATE.

       GL_SRC0_RGB

	   params returns a single symbolic constant value representing the
	   texture combiner zero's RGB source. The initial value is
	   GL_TEXTURE.

       GL_SRC1_RGB

	   params returns a single symbolic constant value representing the
	   texture combiner one's RGB source. The initial value is
	   GL_PREVIOUS.

       GL_SRC2_RGB

	   params returns a single symbolic constant value representing the
	   texture combiner two's RGB source. The initial value is
	   GL_CONSTANT.

       GL_SRC0_ALPHA

	   params returns a single symbolic constant value representing the
	   texture combiner zero's alpha source. The initial value is
	   GL_TEXTURE.

       GL_SRC1_ALPHA

	   params returns a single symbolic constant value representing the
	   texture combiner one's alpha source. The initial value is
	   GL_PREVIOUS.

       GL_SRC2_ALPHA

	   params returns a single symbolic constant value representing the
	   texture combiner two's alpha source. The initial value is
	   GL_CONSTANT.

       GL_OPERAND0_RGB

	   params returns a single symbolic constant value representing the
	   texture combiner zero's RGB operand. The initial value is
	   GL_SRC_COLOR.

       GL_OPERAND1_RGB

	   params returns a single symbolic constant value representing the
	   texture combiner one's RGB operand. The initial value is
	   GL_SRC_COLOR.

       GL_OPERAND2_RGB

	   params returns a single symbolic constant value representing the
	   texture combiner two's RGB operand. The initial value is
	   GL_SRC_ALPHA.

       GL_OPERAND0_ALPHA

	   params returns a single symbolic constant value representing the
	   texture combiner zero's alpha operand. The initial value is
	   GL_SRC_ALPHA.

       GL_OPERAND1_ALPHA

	   params returns a single symbolic constant value representing the
	   texture combiner one's alpha operand. The initial value is
	   GL_SRC_ALPHA.

       GL_OPERAND2_ALPHA

	   params returns a single symbolic constant value representing the
	   texture combiner two's alpha operand. The initial value is
	   GL_SRC_ALPHA.

       GL_RGB_SCALE

	   params returns a single floating-point value representing the
	   current RGB texture combiner scaling factor. The initial value is
	   1.0.

       GL_ALPHA_SCALE

	   params returns a single floating-point value representing the
	   current alpha texture combiner scaling factor. The initial value is
	   1.0.

       GL_COORD_REPLACE

	   params returns a single boolean value representing the current
	   point sprite texture coordinate replacement enable state. The
	   initial value is GL_FALSE.

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

       For OpenGL versions 1.3 and greater, or when the ARB_multitexture
       extension is supported, glGetTexEnv returns the texture environment
       parameters for the active texture unit.

       GL_COMBINE_RGB, GL_COMBINE_ALPHA, GL_SRC0_RGB, GL_SRC1_RGB,
       GL_SRC2_RGB, GL_SRC0_ALPHA, GL_SRC1_ALPHA, GL_SRC2_ALPHA,
       GL_OPERAND0_RGB, GL_OPERAND1_RGB, GL_OPERAND2_RGB, GL_OPERAND0_ALPHA,
       GL_OPERAND1_ALPHA, GL_OPERAND2_ALPHA, GL_RGB_SCALE, and GL_ALPHA_SCALE
       are available only if the GL version is 1.3 or greater.

       GL_TEXTURE_FILTER_CONTROL and GL_TEXTURE_LOD_BIAS are available only if
       the GL version is 1.4 or greater.

       GL_POINT_SPRITE and GL_COORD_REPLACE are available only if the GL
       version is 2.0 or greater.

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
       glActiveTexture(), glTexEnv()

COPYRIGHT
       Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
       under the SGI Free Software B License. For details, see
       http://oss.sgi.com/projects/FreeB/.

AUTHORS
       opengl.org

opengl.org			  03/16/2013		       GLGETTEXENV(3G)
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