skia2/resources/sksl/shared/UnaryPositiveNegative.sksl

uniform half4 colorWhite, colorGreen, colorRed;
uniform float2x2 testMatrix2x2;
uniform float3x3 testMatrix3x3;
uniform float4x4 testMatrix4x4;

bool test_fscalar() {
    float x = colorWhite.r;
    x = +x;
    x = -x;
    return x == -1;
}

bool test_iscalar() {
    int x = int(colorWhite.r);
    x = +x;
    x = -x;
    return x == -1;
}

bool test_fvec() {
    half2 x = colorWhite.rg;
    x = +x;
    x = -x;
    return x == half2(-1);
}

bool test_ivec() {
    int2 x = int2(colorWhite.r);
    x = +x;
    x = -x;
    return x == int2(-1);
}

bool test_mat2() {
    const float2x2 negated = float2x2(-1, -2,
                                      -3, -4);
    float2x2 x = testMatrix2x2;
    x = +x;
    x = -x;
    return x == negated;
}

bool test_mat3() {
    const float3x3 negated = float3x3(-1, -2, -3,
                                      -4, -5, -6,
                                      -7, -8, -9);
    float3x3 x = testMatrix3x3;
    x = +x;
    x = -x;
    return x == negated;
}

bool test_mat4() {
    const float4x4 negated = float4x4(-1,  -2,  -3,  -4,
                                      -5,  -6,  -7,  -8,
                                      -9,  -10, -11, -12,
                                      -13, -14, -15, -16);
    float4x4 x = testMatrix4x4;
    x = +x;
    x = -x;
    return x == negated;
}

half4 main(float2 coords) {
    return test_fscalar()
            && test_iscalar()
            && test_fvec()
            && test_ivec()
            && test_mat2()
            && test_mat3()
            && test_mat4() ? colorGreen : colorRed;
}