Function CullMeshesOrthographic

BindlessDeferred/MeshRenderer.cpp:99–125

Frustum culls meshes for an orthographic projection, and produces a buffer of visible mesh indices

// Frustum culls meshes for an orthographic projection, and produces a buffer of visible mesh indices
static uint64 CullMeshesOrthographic(const OrthographicCamera& camera, bool ignoreNearZ, const Array<DirectX::BoundingBox>& boundingBoxes, Array<uint32>& drawIndices)
{
    Float3 mins = Float3(camera.MinX(), camera.MinY(), camera.NearClip());
    Float3 maxes = Float3(camera.MaxX(), camera.MaxY(), camera.FarClip());
    if(ignoreNearZ)
        mins.z = -10000.0f;

    Float3 extents = (maxes - mins) / 2.0f;
    Float3 center = mins + extents;
    center = Float3::Transform(center, camera.Orientation());
    center += camera.Position();

    DirectX::BoundingOrientedBox obb;
    obb.Extents = extents.ToXMFLOAT3();
    obb.Center = center.ToXMFLOAT3();
    obb.Orientation = camera.Orientation().ToXMFLOAT4();

    uint64 numVisible = 0;
    const uint64 numMeshes = boundingBoxes.Size();
    for(uint64 i = 0; i < numMeshes; ++i)
    {
        if(obb.Intersects(boundingBoxes[i]))
            drawIndices[numVisible++] = uint32(i);
    }

    return numVisible;
}

MeshRenderer::MeshRenderer()
{