为什么 "Warning X4000: use of potentially uninitialized variable" 显示了多个常用方法的用法？

Question

我在hlsli中有一个常用的方法

/// RendererShaderTypes.hlsli
///
static inline float4 OverlayColor(float2 texOverlay, float4 videoColor)
{

      float4 texColor = float4(imageMixTexture[4].Sample(imageMixSampler[4], texOverlay));
      if (texColor.r == keyColor.r &&
          texColor.g == keyColor.g &&
          texColor.b == keyColor.b)
      {
          return videoColor;
      }
      return lerp(texColor, videoColor, transparency);
}

它被多个 hlsl 像素着色器调用。

#include "RendererShaderTypes.hlsli"
float4 main(PSPosTexOverlay input) : SV_TARGET
{
    return OverlayColor(input.texOverlay, backColor);
}

还调用了另一个像素着色器

#include "RendererShaderTypes.hlsli"
float4 main(PSPosVideoTexture input) : SV_TARGET
{
     // lookup color of video
     float4 mixColor = mul(colorMatrix[0], VideoColor(imageMixSampler[0], imageMixTexture[0], input.texImage));
     mixColor.rgb *= mixColor.a;
     mixColor.a = 1.0f;
     return OverlayColor(input.texOverlay, mixColor);
}

编译时显示以下警告。知道它为什么显示吗？

warning X4000: use of potentially uninitialized variable (OverlayColor)

Answer 1

我还不知道任何令人满意的原因，但我已经解决了这个问题。任何调用 mid-function return 语句的函数都会在编译期间显示警告。我有 re-writed 以上之一，警告消失了。

static inline float4 OverlayColor(int texIndex, float2 texOverlay, float4 videoColor)
{
    float4 texColor = float4(imageMixTexture[4].Sample(imageMixSampler[4], texOverlay));
    float4 overlayColor;
    if (texColor.r == keyColor.r &&
        texColor.g == keyColor.g &&
        texColor.b == keyColor.b)
    {
        overlayColor = videoColor;
    }
    else
        overlayColor = lerp(texColor, videoColor, transparency);
    return overlayColor;
}

为什么 "Warning X4000: use of potentially uninitialized variable" 显示了多个常用方法的用法？

Why "Warning X4000: use of potentially uninitialized variable" shows for more than one usage of common method?

c++

hlsl

directx-11

pixel-shader