#include #include using namespace metal; struct Uniforms { half4 src; half4 dst; }; struct Inputs { }; struct Outputs { half4 sk_FragColor [[color(0)]]; }; half _soft_light_component_hh2h2(half2 s, half2 d) { if (2.0h * s.x <= s.y) { return (((d.x * d.x) * (s.y - 2.0h * s.x)) / d.y + (1.0h - d.y) * s.x) + d.x * ((-s.y + 2.0h * s.x) + 1.0h); } else if (4.0h * d.x <= d.y) { half DSqd = d.x * d.x; half DCub = DSqd * d.x; half DaSqd = d.y * d.y; half DaCub = DaSqd * d.y; return (((DaSqd * (s.x - d.x * ((3.0h * s.y - 6.0h * s.x) - 1.0h)) + ((12.0h * d.y) * DSqd) * (s.y - 2.0h * s.x)) - (16.0h * DCub) * (s.y - 2.0h * s.x)) - DaCub * s.x) / DaSqd; } else { return ((d.x * ((s.y - 2.0h * s.x) + 1.0h) + s.x) - sqrt(d.y * d.x) * (s.y - 2.0h * s.x)) - d.y * s.x; } } fragment Outputs fragmentMain(Inputs _in [[stage_in]], constant Uniforms& _uniforms [[buffer(0)]], bool _frontFacing [[front_facing]], float4 _fragCoord [[position]]) { Outputs _out; (void)_out; _out.sk_FragColor = _uniforms.dst.w == 0.0h ? _uniforms.src : half4(_soft_light_component_hh2h2(_uniforms.src.xw, _uniforms.dst.xw), _soft_light_component_hh2h2(_uniforms.src.yw, _uniforms.dst.yw), _soft_light_component_hh2h2(_uniforms.src.zw, _uniforms.dst.zw), _uniforms.src.w + (1.0h - _uniforms.src.w) * _uniforms.dst.w); return _out; }