Untiy Native Render Plugin在VR中的绘制

struct ConstantBuffer
{
    DirectX::XMMATRIX World;
    DirectX::XMMATRIX View;
    DirectX::XMMATRIX Projection;
} g_CB;
extern "C" void UNITY_INTERFACE_EXPORT UNITY_INTERFACE_API SetCameraMatrix(float vm[], float pm[])
{
    g_CB.View = XMLoadFloat4x4(&DirectX::XMFLOAT4X4(vm));
    g_CB.Projection = XMLoadFloat4x4(&DirectX::XMFLOAT4X4(pm));
}

cbuffer MyCB : register(b0) 
{
    float4x4 worldMatrix;
    float4x4 viewMatrix;
    float4x4 projectionMatrix;
}
void VS (float3 pos : POSITION, float4 color : COLOR, out float4 ocolor : COLOR, out float4 opos : SV_Position) 
{
    opos = mul(float4(pos, 1), worldMatrix);
    opos = mul(opos, viewMatrix);
    opos = mul(opos, projectionMatrix);

    ocolor = color;
}

    [DllImport("RenderingPlugin")]
    private static extern void SetCameraMatrix(float[] viewMatrix, float[] projectionMatrix);
    private static float[] MatrixToArray(Matrix4x4 _matrix)
    {
        float[] result = new float[16];

        for (int _row = 0; _row < 4; _row++)
        {
            for (int _col = 0; _col < 4; _col++)
            {
                result[_col + _row * 4] = _matrix[_row, _col];
            }
        }

        return result;
    }

    void OnPostRender()
    {
        // Set time for the plugin
        SetTimeFromUnity(Time.timeSinceLevelLoad);
        if (Camera.current != null)
        {
            var viewMatrix = Camera.current.worldToCameraMatrix;
            var projectionMatrix = GL.GetGPUProjectionMatrix(Camera.current.projectionMatrix, VRSettings.enabled);

            SetCameraMatrix(MatrixToArray(viewMatrix), MatrixToArray(projectionMatrix));
        }

        // Issue a plugin event with arbitrary integer identifier.
        // The plugin can distinguish between different
        // things it needs to do based on this ID.
        // For our simple plugin, it does not matter which ID we pass here.
        GL.IssuePluginEvent(GetRenderEventFunc(), 1);
    }

        XMMATRIX invViewMatrix = XMMatrixInverse(nullptr, g_CB.View);
        XMVECTOR eyePos = XMMatrixTranspose(invViewMatrix).r[3];