Determination of structures in the structure of apples

Question

I play with Metal for iOS, creating a small game. In one of my kernel shaders (in my .metal files). I am defining a structure for storing some metadata for part of the game.

The structure is as follows:

struct ColorSetup {
    float4 color;
    float4 degradationColor;
    float degradationRate;
};

This works fine, but when I try to add more fields to my structure, for example:

struct ColorSetup {
    float4 color;
    float4 degradationColor;
    float4 threshholdColor;
    float degradationRate;
};

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struct ColorSetup {
    packed_float4 color;
    packed_float4 degradationColor;
    float degradationRate;
};

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Edit:

MTLBuffer, inline .metal :

constant ColorSetup redColor = {
    .color = red,
    .degradationColor = white,
    .degradationRate = 0.0035
};

2:

, .

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float4 degrade(float4 color, ColorSetup colorSetup, ColorLimit colorLimit) {
    float4 targetColor = colorSetup.degradationColor;
    float rate = colorSetup.degradationRate;
    if (colorLimit.degradationThreshold.r < color.r && colorLimit.degradationThreshold.g < color.g && colorLimit.degradationThreshold.b < color.b) {
        targetColor = colorSetup.degradationColor;
    } else {
        targetColor = colorSetup.color;
    }

    int r = (color.r - targetColor.r) < 0 ? 1 : -1;
    int g = (color.g - targetColor.g) < 0 ? 1 : -1;
    int b = (color.b - targetColor.b) < 0 ? 1 : -1;
    float4 newColor = float4(color.r + float(r)*rate, color.g + float(g)*rate, color.b + float(b)*rate, 1);
    return normalizeColor(newColor);
}

, , :

struct ColorSetup {
    float4 color;
    float4 degradationColor;
    float degradationRate;
};

( , - . , ).

struct ColorSetup {
    float4 color;
    float4 degradationColor;
    float degradationRate;
    float padding;
};

, float .

constant ColorSetup redColor = {
    .color = red,
    .degradationColor = white,
    .degradationRate = 0.0035,
};

:

constant ColorSetup redColor = {
    .color = red,
    .degradationColor = white,
    .degradationRate = 0.0035,
    .padding = 0
};

, .

: int, :

struct ColorSetup {
    float4 color;
    float4 degradationColor;
    float degradationRate;
    int padding;
};