29 lines
1.1 KiB
Metal
29 lines
1.1 KiB
Metal
#include <metal_stdlib>
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#include <simd/simd.h>
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using namespace metal;
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struct Uniforms {
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half4 src;
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half4 dst;
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};
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struct Inputs {
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};
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struct Outputs {
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half4 sk_FragColor [[color(0)]];
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};
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half blend_overlay_component_Qhh2h2(half2 s, half2 d);
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half4 blend_overlay_h4h4h4(half4 src, half4 dst);
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half blend_overlay_component_Qhh2h2(half2 s, half2 d) {
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return 2.0h * d.x <= d.y ? (2.0h * s.x) * d.x : s.y * d.y - (2.0h * (d.y - d.x)) * (s.y - s.x);
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}
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half4 blend_overlay_h4h4h4(half4 src, half4 dst) {
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half4 result = half4(blend_overlay_component_Qhh2h2(src.xw, dst.xw), blend_overlay_component_Qhh2h2(src.yw, dst.yw), blend_overlay_component_Qhh2h2(src.zw, dst.zw), src.w + (1.0h - src.w) * dst.w);
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result.xyz = result.xyz + (dst.xyz * (1.0h - src.w) + src.xyz * (1.0h - dst.w));
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return result;
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}
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fragment Outputs fragmentMain(Inputs _in [[stage_in]], constant Uniforms& _uniforms [[buffer(0)]], bool _frontFacing [[front_facing]], float4 _fragCoord [[position]]) {
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Outputs _out;
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(void)_out;
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_out.sk_FragColor = blend_overlay_h4h4h4(_uniforms.dst, _uniforms.src);
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return _out;
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}
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