glGetTexEnv man page on RedHat
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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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