HLSL 着色器在我尝试使用值时抛出错误

本文关键字：错误 出错 HLSL | 更新日期: 2023-09-27 18:32:14

所以我试图自学一些HLSL，但我被难住了。我正在编写一个自定义着色器，它具有环境照明和简单的点光源颜色。

下面是着色器代码：

`float4x4 World;
float4x4 View;
float4x4 Projection;
// TODO: add effect parameters here.
float4 AmbientColor = float4(1, 1, 1, 1);
float AmbientIntensity = 0.5;
float4 DiffuseColor = float4(1, 1, 1, 1);
float3 LightPosition = float3(32, 32, 64);
float4 LightDiffuseColor = float4(0.3, 0.05, 0, 1); // intensity multiplier
float4 LightSpecularColor = float4(1, 1, 1, 1); // intensity multiplier
float LightDistance = 50;
texture Texture;
sampler2D textureSampler = sampler_state {
    Texture = (Texture);
    MinFilter = Point;
    MagFilter = Point;
    AddressU = Wrap;
    AddressV = Wrap;
};
struct VertexShaderInput
{
    float4 Pos: POSITION;
    float2 TexCoords : TEXCOORD0;
    float4 Normal : NORMAL0;
};
struct VertexShaderOutput
{
    float4 PosOut : POSITION;
    float2 TextureCoordinate : TEXCOORD0;
    float3 Normal : TEXCOORD1;
};
VertexShaderOutput VertexShaderFunction(VertexShaderInput input)
{
    VertexShaderOutput output;
    float4 worldPosition = mul(input.Pos, World);
    float4 viewPosition = mul(worldPosition, View);
    output.PosOut= mul(viewPosition, Projection);
    output.TextureCoordinate = input.TexCoords;
    output.Normal = mul(input.Normal, World);
    return output;
}
float4 PixelShaderFunction(VertexShaderOutput input) : COLOR0
{ 
    float attenuation = saturate(1.0f - (length(input.PosOut - LightPosition) / LightDistance));
    float4 textureColor = tex2D(textureSampler, input.TextureCoordinate);
    textureColor.a = 1;
    float4 lightCol = 
    //LightDiffuseColor;
    mul(LightDiffuseColor, attenuation); 
    float4 ambient = (AmbientColor * AmbientIntensity);
    ambient.a = 1;
    return saturate(textureColor * ambient + lightCol);
}
technique Textured
{
    pass Pass1
    {
        // TODO: set renderstates here.
        VertexShader = compile vs_2_0 VertexShaderFunction();
        PixelShader = compile ps_2_0 PixelShaderFunction();
    }
}

'

该问题已缩小到像素着色器中的以下部分：

float attenuation = saturate(1.0f - (length(input.PosOut - LightPosition) / LightDistance));    
...
float4 lightCol = 
//LightDiffuseColor;
mul(LightDiffuseColor, attenuation); 
return saturate(textureColor * ambient + lightCol);

如果我只使用 LightDiffuseColor，它会正常工作，但是一旦我尝试乘以它，它就会抛出此错误：

GameContentShadersSimpleTexture.fx(35,21) error X4502 invalid ps_2_0 input semantic 'POSITION'

我正在使用XNA作为引擎。我在这里有点难倒。谁能帮我？

谢谢 涂鸦。

编辑：Mkay，所以我把它缩小到一个非常精确的位置。这是调用长度函数（输入。位置输出 - 光位置）

HLSL 着色器在我尝试使用值时抛出错误

好的，所以我有一个解决方案。我不应该对点光源使用每像素照明，而应该使用顶点照明。像素着色器输入不支持位置语义，如此处所示。但位置仍然需要是顶点着色器的输出，因此它包含在像素着色器输入中，但不能使用。我更新的代码如下所示：

float4x4 World;
float4x4 View;
float4x4 Projection;
// TODO: add effect parameters here.
float4 AmbientColor = float4(1, 1, 1, 1);
float AmbientIntensity = 0.5;
float4 DiffuseColor = float4(1, 1, 1, 1);
float3 LightPosition = float3(32, 32, 48);
float4 LightDiffuseColor = float4(0.3, 0.05, 0, 1);
float4 LightSpecularColor = float4(1, 1, 1, 1); // intensity multiplier
float LightDistance = 100;
texture Texture;
sampler2D textureSampler = sampler_state {
    Texture = (Texture);
    MinFilter = Point;
    MagFilter = Point;
    AddressU = Wrap;
    AddressV = Wrap;
};
struct VertexShaderInput
{
    float4 Position : POSITION0;
    float4 Normal : NORMAL0;
    float2 TextureCoordinate : TEXCOORD0;
};
struct PixelShaderInput
{
    float4 Position : POSITION0;
    float4 Color : COLOR1;
    float3 Normal : TEXCOORD0;
    float2 TextureCoordinate : TEXCOORD1;
};
PixelShaderInput VertexShaderFunction(VertexShaderInput input)
{
    PixelShaderInput output;
    float4 worldPosition = mul(input.Position, World);
    float4 viewPosition = mul(worldPosition, View);
    output.Position= mul(viewPosition, Projection);
    output.Color = mul(LightDiffuseColor,saturate(1.0f - (length(mul(input.Position, World) - LightPosition) / LightDistance)));
    output.TextureCoordinate = input.TextureCoordinate;
    output.Normal = mul(input.Normal, World);
    return output;
}
float4 PixelShaderFunction(PixelShaderInput input) : COLOR0
{ 
    float4 textureColor = tex2D(textureSampler, input.TextureCoordinate);
    textureColor.a = 1;
    float4 ambient = (AmbientColor * AmbientIntensity);
    ambient.a = 1;
    return saturate(textureColor * ambient + input.Color);
}
technique Textured
{
    pass Pass1
    {
        // TODO: set renderstates here.
        VertexShader = compile vs_1_1 VertexShaderFunction();
        PixelShader = compile ps_2_0 PixelShaderFunction();
    }
}
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