xref: /aosp_15_r20/external/skia/resources/sksl/shared/SwizzleAsLValue.sksl (revision c8dee2aa9b3f27cf6c858bd81872bdeb2c07ed17)

uniform half4 colorGreen, colorRed;

half4 main(float2) {
    float4 scalar;
    float4 array[1];

    // Test swizzled-lvalue assignment on a scalar.
    scalar         = float4(colorGreen) * 0.5;             // 0,    0.5, 0,    0.5
    scalar.a       = 2.0;                                  // 0,    0.5, 0,    2
    scalar.g      /= 0.25;                                 // 0,    2,   0,    2
    scalar.gba    *= float3x3(0.5);                        // 0,    1,   0,    1
    scalar.bgar   += float4(0.25, 0.0, 0.0, 0.75);         // 0.75, 1,   0.25, 1
    scalar.r      += scalar.a <= 1.0 ? scalar.b : 0.0;     // 1,    1,   0.25, 1

    // Test swizzled-lvalue assignment on an array element.
    array[0]       = float4(colorGreen) * 0.5;             // 0,    0.5, 0,    0.5
    array[0].a     = 2.0;                                  // 0,    0.5, 0,    2
    array[0].g    /= 0.25;                                 // 0,    2,   0,    2
    array[0].gba  *= float3x3(0.5);                        // 0,    1,   0,    1
    array[0].bgar += float4(0.25, 0.0, 0.0, 0.75);         // 0.75, 1,   0.25, 1
    array[0].r    += array[0].a <= 1.0 ? array[0].b : 0.0; // 1,    1,   0.25, 1

    return (scalar == float4(1, 1, 0.25, 1) && array[0] == float4(1, 1, 0.25, 1)) ? colorGreen
                                                                                  : colorRed;
}