C++在像素着色器的问题

的DirectX照明我有，我不能设法弄清楚一个问题。我只是给我的项目添加了一个点光源，它使纹理完全变黑。我不知道为什么。C++在像素着色器的问题

我想，这可能是要么无法正确更新，也可能是s.x，s.y和s.z.的计算正常

我将非常高兴，如果有人有时间来看看它和帮助我。谢谢。

所以。这里是我的像素着色器：

Texture2D txDiffuse : register(t0); 
SamplerState sampState; 
cbuffer PointLight : register(b0) 
{ 
    float3 Pos; 
    float diff; 
    float amb; 
    float spec; 
    float range; 
    float intensity; 
}; 
struct VS_IN 
{ 
    float4 Pos : SV_POSITION; 
    float2 Tex : TEXCOORD; 
    float4 Norm : NORMAL; 
    float4 Pos2 : POSITION; 
}; 
float4 PS_main(VS_IN input) : SV_Target 
{ 
    float3 s = txDiffuse.Sample(sampState, input.Tex).xyz; 

    float3 lightPos = Pos; 

    float3 lightVector = lightPos - input.Pos2; 
    lightVector = normalize(lightVector); 
    float nDotL = dot(lightVector, input.Norm); 

    float diff1 = 0.8; 
    float amb1 = 0.1; 

    s.x = (s.x * diff * nDotL + s.x * amb); 
    s.y = (s.y * diff * nDotL + s.y * amb); 
    s.z = (s.z * diff * nDotL + s.z * amb); 



    return float4(s, 0.0); 

};

几何着色器：

cbuffer worldMatrix : register(b0) 
{ 
    matrix world; 
} 
cbuffer viewMatrix : register(b1) 
{ 
    matrix view; 
} 
cbuffer projectionMatrix : register(b2) 
{ 
    matrix projection; 
} 
struct VS_IN 
{ 
    float4 Pos : SV_POSITION; 
    float2 Tex : TEXCOORD; 
}; 
struct VS_OUT 
{ 
    float4 Pos : SV_POSITION; 
    float2 Tex : TEXCOORD; 
    float4 Norm : NORMAL; 
    float4 Pos2 : POSITION; 
}; 

[maxvertexcount(6)] 
void main(triangle VS_IN input[3] : SV_POSITION, inout TriangleStream<VS_OUT> output2) 
{ 

    matrix wvp = mul(projection, mul(world, view)); 
    matrix worldView = mul(world, view); 


    float4 normal = float4(cross(input[1].Pos - input[0].Pos, input[2].Pos - input[0].Pos), 0.0f); 
    normal = normalize(normal); 

    float4 rotNorm = mul(worldView, normal); 
    rotNorm = normalize(rotNorm); 

    VS_OUT output[3]; 
    for (uint i = 0; i < 3; i++) 
    { 
     output[i].Pos = input[i].Pos; 
     output[i].Pos = mul(wvp, input[i].Pos); 
     output[i].Tex = input[i].Tex; 
     output[i].Norm = rotNorm; 
     output[i].Pos2 = mul(worldView, output[i].Pos); 
     output2.Append(output[i]); 
    } 
    output2.RestartStrip(); 

    VS_OUT outputcopy[3]; 
    for (uint i = 0; i < 3; i++) 
    { 
     outputcopy[i].Pos = input[i].Pos + (normal); 
     outputcopy[i].Pos = mul(wvp, outputcopy[i].Pos); 
     outputcopy[i].Tex = input[i].Tex; 
     outputcopy[i].Norm = rotNorm; 
     outputcopy[i].Pos2 = mul(worldView, outputcopy[i].Pos); 
     output2.Append(outputcopy[i]); 
    } 

    output2.RestartStrip(); 
}

代码以初始化点光源：

struct PointLight 
{ 
    Vector3 Pos; 
    float diff; 
    float amb; 
    float spec; 
    float range; 
    float intensity; 

}; 
PointLight* pointLight = nullptr; 
PointLight PL = 
    { 
    Vector3(0.0f, 0.0f, -3.0f), 
    0.8f, 
    0.2f, 
    0.0f, 
    100.0f, 
    1.0f 
    }; 

    pointLight = &PL; 

    D3D11_BUFFER_DESC lightBufferDesc; 
    memset(&lightBufferDesc, 0, sizeof(lightBufferDesc)); 
    lightBufferDesc.BindFlags = D3D11_BIND_CONSTANT_BUFFER; 
    lightBufferDesc.Usage = D3D11_USAGE_DEFAULT; 
    lightBufferDesc.StructureByteStride = 0; 
    lightBufferDesc.MiscFlags = 0; 
    lightBufferDesc.ByteWidth = sizeof(PointLight); 

    D3D11_SUBRESOURCE_DATA pointLightData; 
    memset(&pointLightData, 0, sizeof(pointLightData)); 
    pointLightData.pSysMem = &PL; 

    gDevice->CreateBuffer(&lightBufferDesc, &pointLightData, &lightBuffer);

和渲染（）我运行

gDeviceContext->PSSetConstantBuffers(0, 1, &lightBuffer);

来源

2016-02-29 Rickard

莫不是你的点光源缓冲区对齐/填充问题？我不确定C++和着色语言中的规则是否相同。 – jcoder

如果纹理将为黑色，s.y，s.z等于零。

s.x = (s.x * diff * nDotL + s.x * amb); 
s.y = (s.y * diff * nDotL + s.y * amb); 
s.z = (s.z * diff * nDotL + s.z * amb);

尝试改变diff和amb用非零常数，这样就可以确保你正确或不设置缓冲含量的不同。如果你改变他们之后，它仍然是黑色的，那么它必须是nDotL和/或采样的纹理是零。然后用纹理样本的非零常量尝试。如果他们仍然使纹理看起来黑色，那么你的光矢量计算就是罪魁祸首。

来源

2016-03-01 04:29:20

C++在像素着色器的问题

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