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glGetTexEnvfv, glGetTexEnviv - return texture environment parameters
void glGetTexEnvfv( GLenum target,
GLenum pname,
GLfloat *params )
void glGetTexEnviv( GLenum target,
GLenum pname,
GLint *params )
- 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.
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).
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.
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.
glActiveTextureARB(3G)
,
glTexEnv(3G)
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