Scale texture projected with a lamp

Hi! I’m beginning with Blender sources coding and I’m looking for a way to scale textures projected with a sopt lamp (on 1 axis). I tried different things in gpu_shader_material.glsl but without success.

(scale the smiley)

Thanks for your help!

EDIT: I think I found in gpu_shader_material.glsl line 2089 void shade_light_texture: co