Question

我正在尝试使用着色器中的变量反映所有常量缓冲区，但是反射器给出了错误的名称。着色器：

struct ModelViewProjection
{
    matrix MVP;
    float a;
};
struct SomeConstBuffer1
{
    matrix MVP;
    float a;
};
struct SomeConstBuffer2
{
    matrix MVP;
    float a;
};

ConstantBuffer<ModelViewProjection> cb3 : register(b3);
ConstantBuffer<SomeConstBuffer1> cb4 : register(b4);
ConstantBuffer<SomeConstBuffer2> cb6 : register(b6);

c ++代码：

void Dx12CoreShader::reflectShader(SubShader& shader)
{
    ID3D12ShaderReflection* reflection;
    ThrowIfFailed(D3DReflect(shader.blob->GetBufferPointer(), shader.blob->GetBufferSize(), IID_ID3D12ShaderReflection, (void**)& reflection));

    D3D12_SHADER_DESC desc;
    reflection->GetDesc(&desc);

    // here ok. desc.ConstantBuffers == 3
    for (unsigned int i = 0; i < desc.ConstantBuffers; ++i)
    {
        ID3D12ShaderReflectionConstantBuffer* buffer = reflection->GetConstantBufferByIndex(i);

        D3D12_SHADER_BUFFER_DESC bufferDesc;
        buffer->GetDesc(&bufferDesc);
        // here ok. bufferDesc.Name == "cb3"

        // here wrong! bufferDesc.Variables==1, I expected 2       
        for (UINT j = 0; j < bufferDesc.Variables; j++)
        {
            ID3D12ShaderReflectionVariable* var = buffer->GetVariableByIndex(j);
            D3D12_SHADER_VARIABLE_DESC varDesc;
            var->GetDesc(&varDesc);
            // here also wrong.
            // I expect "MVP" first but it returns also "cb3"

        }
    }
}

我的配置：AMD Ryzen 3 2200U和radeon Vega Mobile Gfx。我究竟做错了什么？这可能是错误吗？类似的情况也可以在DirectX 11上正常工作。

UPD：我使用所有变量来防止编译器进行优化。

Answer 1

我固定了。

cbuffer ModelViewProjection : register(b3)
{
    matrix MVP;
    float a;
};
cbuffer SomeConstBuffer1 : register(b4)
{
    matrix MVP1;
    float a1;
};
cbuffer SomeConstBuffer2 : register(b6)
{
    matrix MVP2;
    float a2;
};

DirectX12反射无法检测到常量缓冲区

1 个答案: