G
glGetTexEnv
Chapter 7
213
glGetTexEnv
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
GL_TEXTURE_ENV_COLOR and
GL_TEXTURE_LIGHTING_MODE_hp.
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).
GL_TEXTURE_LIGHTING_MODE_hp
params returns the single-valued texture lighting mode, a symbolic constant.
Notes
If an error is generated, no change is made to the contents of params.
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