[pixel shader] uniform float4 f; float4 main() : sv_target { return sqrt(f); } [test] uniform 0 float4 1.0 9.0 32.3 46.5 todo(glsl) draw quad probe all rgba (1.0, 3.0, 5.683309, 6.819091) 1 [pixel shader] uniform float4 f; float4 main() : sv_target { return rsqrt(f); } [test] uniform 0 float4 1.0 9.0 4.0 16.0 todo(glsl) draw quad probe all rgba (1.0, 0.33333333, 0.5, 0.25) 1