Make GLSL version of lerp (more) compatible with CPU implementation
Make GLSL version of lerp (more) compatible with CPU implementation


Former-commit-id: 0ea4c57ecaa4a9fc1db7645a88710b8d10a7236e
darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide