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
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
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 ALSOglActiveTextureARB(3G), glTexEnv(3G)
March 1, 2011
