Translating texgen

The IRIS GL function texgen is translated to glTexGen for OpenGL.

With IRIS GL, you call texgen twice: once to set the mode and plane equation simultaneously, and once to enable texture-coordinate generation. For example:

texgen(TX_S, TG_LINEAR, planeParams); 
texgen(TX_S, TG_ON, NULL); 
 

With OpenGL, you make three calls: two to glTexGen (once to set the mode and once to set the plane equation), and one to glEnable. For example, the OpenGL equivalent to the IRIS GL code above is:

glTexGen(GL_S, GLTEXTURE_GEN_MODE, modeName); 
glTextGen(GL_S, GL_OBJECT_PLANE, planeParameters); 
glEnable(GL_TEXTURE_GEN_S); 
 

The following table lists the IRIS GL texture-coordinate names and their OpenGL equivalents.

The following table lists the IRIS GL texture-generation modes and their equivalent OpenGL texture modes and plane names.