glLightEnv(3G) OpenGL Reference glLightEnv(3G)
glLightEnviSGIX - specify fragment lighting environment
void glLightEnviSGIX( GLenum pname,
GLint param )
pname Must be GL_LIGHT_ENV_MODE_SGIX
param Can be one of three values: GL_REPLACE, GL_MODULATE, or GL_ADD
GL_LIGHT_ENV_MODE_SGIX specifies how the color computed by fragment
lighting calculations is combined with the post-texturing fragment color.
GL_REPLACE The lighting color replaces the fragment color
GL_MODULATE Each (R,G,B,A) component of the fragment color is
multiplied by the corresponding component of the
GL_ADD The lighting color is added to the fragment color
Initially GL_LIGHT_ENV_MODE_SGIX is set to GL_REPLACE.
glLightEnv is part of the GL_SGIX_fragment_lighting extension. glLightEnv
is present only if GL_SGIX_fragment_lighting is returned when glGetString
is called with GL_EXTENSIONS as its argument.
GL_INVALID_OPERATION is generated if glLightEnv is executed between the
execution of glBegin and the corresponding execution of glEnd.
GL_INVALID_ENUM is generated if pname is not GL_LIGHT_ENV_MODE_SGIX, or
param is not one of GL_REPLACE, GL_MODULATE, or GL_ADD.
glGet with an argument of GL_LIGHT_ENV_MODE_SGIX
The SGIX_fragment_lighting extension is supported only on Octane2 VPro
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