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. The two parameters are as follows: GL_TEXTURE_ENV_MODE params returns the single-valued texture environment mode, a symbolic constant. 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.
If an error is generated, no change is made to the contents of params.
GL_INVALID_ENUM is generated if target or pname is not an accepted value. GL_INVALID_OPERATION is generated if glGetTexEnv is called between a call to glBegin and the corresponding call to glEnd.
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Fri Dec 6 11:18:03 EST 1996
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