MirOS Manual: glGetTexEnv(3), glGetTexEnvfv(3), glGetTexEnviv(3)

GLGETTEXENV(3G)     UNIX Programmer's Manual      GLGETTEXENV(3G)


     glGetTexEnvfv, glGetTexEnviv - return texture environment


     void glGetTexEnvfv( GLenum target,
                         GLenum pname,
                         GLfloat *params )
     void glGetTexEnviv( GLenum target,
                         GLenum pname,
                         GLint *params )


     target  Specifies a texture environment. Must be

     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 speci-
     fies a texture environment. Currently, only one texture
     environment is defined and supported: GL_TEXTURE_ENV.

     pname names a specific texture environment parameter, as

               params returns the single-valued texture environ-
               ment mode, a symbolic constant. The initial value
               is GL_MODULATE.

               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 represen-
               tation 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.

MirOS BSD #10-current  Printed 03.04.2017                       1

GLGETTEXENV(3G)     UNIX Programmer's Manual      GLGETTEXENV(3G)

     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 exe-
     cution of glEnd.


     glActiveTextureARB(3G), glTexEnv(3G)

MirOS BSD #10-current  Printed 03.04.2017                       2

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