vkd3d/tests/hlsl/writemask-assignop-0.shader_test

[pixel shader]
uniform float4 color;

float4 main() : SV_target
{
    float4 ret = color;
    ret.zw += float2(0.5, 0.3);
    ret.yx -= float2(0.1, 0.5);
    return ret;
}

[test]
uniform 0 float4 0.0303 0.08 0.07 0.0202
todo(sm>=6) draw quad
probe all rgba (-0.4697, -0.02, 0.57, 0.3202) 2