x SuSE Linux 13.1-RELEASE x
x SuSE Linux 13.1-RELEASEx
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 re-
quested, are linearly mapped from the internal floating-point
representation such that 1.0 maps to the most positive repre-
sentable integer, and -1.0 maps to the most negative repre-
sentable 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 re-
turns 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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