KSG-Framework/DX12BLASModel.cpp

#include "DX12BLASModel.h"

#include "Model3D.h"

Framework::DX12BLASModel::DX12BLASModel(
    Model3DData* zModelData, ID3D12Device5* zDevice)
    : ReferenceCounter(),
      zModelData(zModelData),
      zDevice(zDevice),
      vertexBuffers(0),
      indexBuffers(0)
{}

Framework::DX12BLASModel::~DX12BLASModel()
{
    if (vertexBuffers)
    {
        vertexBuffers->release();
    }
    if (indexBuffers)
    {
        indexBuffers->release();
    }
}

void Framework::DX12BLASModel::calculateBuffers()
{
    if (!zModelData->wasIndexBufferChanged()
        && !zModelData->wasVertexBufferChanged())
    {
        return;
    }
    Skeleton* skeleton = zModelData->zSkeleton();
    const Vertex3D* vertexBuffer = zModelData->zVertexBuffer();
    const int* indexBuffer = zModelData->getIndexBuffer();
    int vertexCount = zModelData->getVertexCount();
    int indexCount = zModelData->getIndexCount();
    int maxBoneId = skeleton ? skeleton->getNextBoneId() : 0;
    int** boneIndexMapping = new int*[maxBoneId + 1];
    memset(boneIndexMapping, 0, sizeof(int*) * (maxBoneId + 1));
    Vec3<float>** boneVertexBuffers = new Vec3<float>*[maxBoneId + 1];
    memset(boneVertexBuffers, 0, sizeof(Vec3<float>*) * (maxBoneId + 1));
    int* boneVertexCount = new int[maxBoneId + 1];
    memset(boneVertexCount, 0, sizeof(int) * (maxBoneId + 1));
    int** boneIndexBuffers = new int*[maxBoneId + 1];
    memset(boneIndexBuffers, 0, sizeof(int*) * (maxBoneId + 1));
    int* boneIndexCount = new int[maxBoneId + 1];
    memset(boneIndexCount, 0, sizeof(int) * (maxBoneId + 1));
    for (int i = 0; i < indexCount; i += 3)
    { // for each triangle
        int b1 = -1;
        int b2 = -1;
        for (int b = 0; b < 3; b++)
        { // for each bone of the model that is touched by the triangle
            int bone = vertexBuffer[indexBuffer[i + b]].knochenId;
            if (b1 != bone && b2 != bone)
            { // check if the bone is the same as the other two bones of the
              // triangle that were already processed
                if (b1 < 0)
                {
                    b1 = bone;
                }
                else if (b2 < 0)
                {
                    b2 = bone;
                }
                if (!boneIndexMapping[bone])
                {
                    boneIndexMapping[bone] = new int[vertexCount];
                    memset(
                        boneIndexMapping[bone], -1, sizeof(int) * vertexCount);
                }
                if (!boneVertexBuffers[bone])
                {
                    boneVertexBuffers[bone] = new Vec3<float>[vertexCount];
                }
                if (!boneIndexBuffers[bone])
                {
                    boneIndexBuffers[bone] = new int[indexCount];
                }
                for (int j = 0; j < 3; j++)
                { // add the vertecies and indices of the triangle to the
                  // buffers of the bone
                    if (boneIndexMapping[bone][indexBuffer[i + j]] < 0)
                    {
                        boneIndexMapping[bone][indexBuffer[i + j]]
                            = boneVertexCount[bone];
                        boneVertexBuffers[bone][boneVertexCount[bone]]
                            = vertexBuffer[indexBuffer[i + j]].pos;
                        boneVertexCount[bone]++;
                    }
                    boneIndexBuffers[bone][boneIndexCount[bone]]
                        = boneIndexMapping[bone][indexBuffer[i + j]];
                    boneIndexCount[bone]++;
                }
            }
        }
    }
    zModelData->setIndexBufferChanged(0);
    zModelData->setVertexBufferChanged(0);
    if (!vertexBuffers)
    {
        vertexBuffers = new RCArray<DX12Buffer>();
    }
    if (!indexBuffers)
    {
        indexBuffers = new RCArray<DX12Buffer>();
    }
    vertexBuffers->clear();
    indexBuffers->clear();
    for (int i = 0; i <= maxBoneId; i++)
    {
        if (boneVertexCount[i] > 0 && boneIndexCount[i] > 0)
        {
            DX12Buffer* vertexBuffer
                = new DX12Buffer(sizeof(Vec3<float>), zDevice, 0);
            vertexBuffer->setData(boneVertexBuffers[i], true);
            vertexBuffer->setLength(boneVertexCount[i] * sizeof(Vec3<float>));
            vertexBuffer->copyToGPU();
            vertexBuffers->add(vertexBuffer);

            DX12Buffer* indexBuffer = new DX12Buffer(sizeof(int), zDevice, 0);
            indexBuffer->setData(boneIndexBuffers[i], true);
            indexBuffer->setLength(boneIndexCount[i] * sizeof(int));
            indexBuffer->copyToGPU();
            indexBuffers->add(indexBuffer);
        }
        delete[] boneIndexMapping[i];
        delete[] boneVertexBuffers[i];
        delete[] boneIndexBuffers[i];
    }
    delete[] boneIndexMapping;
    delete[] boneVertexBuffers;
    delete[] boneVertexCount;
    delete[] boneIndexBuffers;
    delete[] boneIndexCount;
}

int Framework::DX12BLASModel::getBufferCount() const
{
    return vertexBuffers ? vertexBuffers->getEntryCount() : 0;
}

const Framework::RCArray<Framework::DX12Buffer>*
Framework::DX12BLASModel::zVertexBuffers() const
{
    return vertexBuffers;
}

const Framework::RCArray<Framework::DX12Buffer>*
Framework::DX12BLASModel::zIndexBuffers() const
{
    return indexBuffers;
}