35         float4 ab = mix(p0.xyxy(), p1.xyxy(), T);  in chopAndWriteQuads()
36         float4 bc = mix(p1.xyxy(), p2.xyxy(), T);  in chopAndWriteQuads()
37         float4 abc = mix(ab, bc, T);  in chopAndWriteQuads()
39         float4 middle = mix(ab, bc, mix(T, T.zwxy(), 2/3.f));  in chopAndWriteQuads()
83         float4 ab = mix(h0, h1, T);  in chopAndWriteConics()
84         float4 bc = mix(h1, h2, T);  in chopAndWriteConics()
85         float4 abc = mix(ab, bc, T);  in chopAndWriteConics()
117         float4 ab = mix(p0.xyxy(), p1.xyxy(), T);  in chopAndWriteCubics()
118         float4 bc = mix(p1.xyxy(), p2.xyxy(), T);  in chopAndWriteCubics()
119         float4 cd = mix(p2.xyxy(), p3.xyxy(), T);  in chopAndWriteCubics()
120         float4 abc = mix(ab, bc, T);  in chopAndWriteCubics()
121         float4 bcd = mix(bc, cd, T);  in chopAndWriteCubics()
122         float4 abcd = mix(abc, bcd, T);  in chopAndWriteCubics()
123         float4 middle = mix(abc, bcd, T.zwxy());  // p1 & p2 of the middle cubic.  in chopAndWriteCubics()