1GLGETTEXENV(3G)                                                GLGETTEXENV(3G)
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NAME

6       glGetTexEnvfv, glGetTexEnviv - return texture environment parameters
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C SPECIFICATION

10       void glGetTexEnvfv( GLenum target,
11                           GLenum pname,
12                           GLfloat *params )
13       void glGetTexEnviv( GLenum target,
14                           GLenum pname,
15                           GLint *params )
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PARAMETERS

19       target  Specifies a texture environment.  Must be GL_TEXTURE_ENV.
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21       pname   Specifies the symbolic name of a texture environment parameter.
22               Accepted      values      are      GL_TEXTURE_ENV_MODE      and
23               GL_TEXTURE_ENV_COLOR.
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25       params  Returns the requested data.
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DESCRIPTION

28       glGetTexEnv  returns in params selected values of a texture environment
29       that was specified with glTexEnv.  target specifies a texture  environ‐
30       ment.   Currently,  only  one  texture  environment is defined and sup‐
31       ported: GL_TEXTURE_ENV.
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33       pname names a specific texture environment parameter, as follows:
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35       GL_TEXTURE_ENV_MODE
36                 params returns the single-valued texture environment mode,  a
37                 symbolic constant. The initial value is GL_MODULATE.
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39       GL_TEXTURE_ENV_COLOR
40                 params returns four integer or floating-point values that are
41                 the  texture  environment  color.    Integer   values,   when
42                 requested,  are  linearly  mapped from the internal floating-
43                 point representation such that 1.0 maps to the most  positive
44                 representable  integer,  and  -1.0  maps to the most negative
45                 representable integer. The initial value is (0, 0, 0, 0).
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NOTES

48       If an error is generated, no change is made to the contents of params.
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50       When  the  GL_ARB_multitexture  extension  is  supported,   glGetTexEnv
51       returns the texture environment parameters for the active texture unit.
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ERRORS

54       GL_INVALID_ENUM  is  generated  if  target  or pname is not an accepted
55       value.
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57       GL_INVALID_OPERATION is generated if glGetTexEnv  is  executed  between
58       the execution of glBegin and the corresponding execution of glEnd.
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SEE ALSO

61       glActiveTextureARB(3G), glTexEnv(3G)
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65                                                               GLGETTEXENV(3G)