c++ - 顶点着色器中的 Direct3D11 错误顶点变换

Question

我正在尝试运行 D3D 11 渲染系统的实践来加载和渲染 FBX 文件，但我在顶点着色器中转换顶点时遇到问题。

我不认为出了什么问题，在 Visual Studio Graphics Debugger 中，我可以看到传递给管道的网格在输入汇编器阶段是正常的，但是在顶点着色器转换之后，所有问题都爆发并呈现错误，如果有人能告诉我出了什么问题，我会很感激你提供的信息。

View of the Input Assembler Stage

View of the Vertex Shader Output

这是顶点着色器代码

cbuffer MatrixBuffer
{
    matrix worldMatrix;
    matrix viewMatrix;
    matrix projectionMatrix;
};

struct VertexInputType
{
    float4 position : POSITION;
    float3 normal : NORMAL;
    float2 uv : TEXCOORD;
};

struct PixelInputType
{
    float4 position : SV_POSITION;
    float3 normal : NORMAL;
    float2 uv : TEXCOORD;
};

PixelInputType TextureVertexShader(VertexInputType input)
{
    PixelInputType output;

    output.position = mul(input.position, worldMatrix);
    output.position = mul(output.position, viewMatrix);
    output.position = mul(output.position, projectionMatrix);

    output.normal = input.normal;
    output.uv = input.uv;

    return output;
}

这是矩阵初始化的代码

float lFieldOfView = 3.141592f * 0.4f;
float lScreenAspect = static_cast<float>(width_) / static_cast<float>(height_);

DirectX::XMMATRIX lProjection = MatrixDirectX::XMMatrixPerspectiveFovLHlFieldOfView, lScreenAspect, 1.0f, 10000.0f);
DirectX::XMStoreFloat4x4(&lMatrixBuffer.projectionMatrix, lProjectionMatrix);

DirectX::XMMATRIX lWorldMatrix = DirectX::XMMatrixIdentity();
DirectX::XMStoreFloat4x4(&lMatrixBuffer.worldMatrix, lWorldMatrix);

DirectX::XMFLOAT3 lookAtPos(0.0f, 0.0f, 0.0f);
DirectX::XMFLOAT3 eyePos(0.0f, 0.0f, -50.0f);
DirectX::XMFLOAT3 upDir(0.0f, 1.0f, 0.0f);
DirectX::FXMVECTOR lLookAtPos = DirectX::XMLoadFloat3(&lookAtPos);
DirectX::FXMVECTOR lEyePos    = DirectX::XMLoadFloat3(&eyePos);
DirectX::FXMVECTOR lUpDir     = DirectX::XMLoadFloat3(&upDir);

DirectX::XMMATRIX lViewMatrix = DirectX::XMMatrixLookAtLH(lEyePos, lLookAtPos, lUpDir);
DirectX::XMStoreFloat4x4(&lMatrixBuffer.viewMatrix, lViewMatrix);

D3D11_BUFFER_DESC lBufferDesc = { 0 };
lBufferDesc.ByteWidth      = sizeof(MatrixBufferType);
lBufferDesc.Usage          = D3D11_USAGE_DYNAMIC;
lBufferDesc.BindFlags      = D3D11_BIND_CONSTANT_BUFFER;
lBufferDesc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;

D3D11_SUBRESOURCE_DATA lMatrixBufferData;
lMatrixBufferData.pSysMem = &lMatrixBuffer;

hResult = D3DDevice_->CreateBuffer(&lBufferDesc, &lMatrixBufferData, &D3DMatrixBuffer_);

Answer 1

从评论来看，问题实际上可能是矩阵行优先/列优先差异。如果在 CPU 端转置矩阵，原始 HLSL 代码可能会起作用。