Mesa only exposes fp64 on core profiles.
4ce9b22 arb_gpu_shader_fp64: make fs-modf-double require GLSL 1.50
.../built-in-functions/fs-modf-double.shader_test | 19 +++++++++++++------
1 file changed, 13 insertions(+), 6 deletions(-)
Upstream: cgit.freedesktop.org