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.
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 ALSO
glTexEnv