GTX780 ti (372.54)
Broken: 2.78.4 67bef6b
Worked: 2.78 e8299c8 (official)
Short description of error
The background image is not showing in viewport (but it's rendering alright) if I use a lightpath as a factor to mix two environment images texture. A message appear in the windows console :
GPUShader: compile error:
0(3699) : error C1104: too many parameters in function call
This is not happening with the official.
Exact steps for others to reproduce the error
Open the .blend file : No background image appear in the viewport (if you render, it's ok), look in the window console for a error message.
Unlink the lightpath from the mix shader, the background image appear in the viewport.
Thanks a lot for your work !