Question

我的struct文件中有metal：

struct Vects
{
    float3 position[100];
};

将用于保存缓冲区数据：

kernel void compute(texture2d<float, access::write> output [[texture(0)]],
                    constant float &time [[buffer(0)]],
                    constant mouseInput &mouse [[buffer(1)]],
                    constant Vects &vects [[buffer(2)]],//<--- Vects
                    uint2 gid [[thread_position_in_grid]]) {
...
sceneSDF(origin, vects);
...
}

其中

float sceneSDF(float3 cotu,Vects vects) {

    float a;

    for(int i = 1; i < 3 ; i++){

        float3 u = vects[i-1].position;//<-- error!
        float3 v = vects[i].position;//<-- error!
        a = min(fSphere(cotu + u,0.7),fSphere(cotu + v,0.7));

    }
    return a;
}

我在float3 u和float3 v

时收到错误消息

类型＆＃39; Vects＆＃39;不提供下标运算符

我该如何解决这个问题？

Answer 1

我认为你的点符号和数组下标的命令在你的情况下混淆了。这些行：

float3 u = vects[i-1].position;
float3 v = vects[i].position;

应该是：

float3 u = vects.position[i-1];
float3 v = vects.position[i];

Answer 2

你需要这样写：

private System.Timers.Timer timer;

public void CountDown()
{
    timer = new System.Timers.Timer();
    timer.Interval = 5000;
    timer.Elapsed += OnTimedEvent;

    if (TimerRunning == true)
    {
        timer.Enabled = true;
    }
    else
    {
        timer.Enabled = false;
        TimerRunning = false;
    }
}

public void OnTimedEvent(object sender, System.Timers.ElapsedEventArgs e)
{
    // Check if really timer is okay to launch
    if (CountDownRunning == true)
    {
        TimerRunning = true;
    }
    else
    {
        TimerRunning = false;
        timer.Elapsed -= OnTimedEvent;
    }
}

因为vects不是数组，所以你不能那样使用它。你的类型是v，float3，它与vects.position [i]

相同

Metal Shading Language - struct不提供下标运算符

2 个答案: