Method Draw

engine/Poseidon/Graphics/Rendering/Shape/ClipShape.cpp:202–293

*/

void FaceArray::Draw(const IAnimator* matSource, TLVertexTable& tlTable, const LightList& lights, const Shape& mesh,
                     ClipFlags clipFlags, int spec, const Matrix4& invTransform) const
{
    DoAssert(_sections.Size() == 0 || _sections[_sections.Size() - 1].end == End());
    Engine* engine = GEngine;
    if ((spec & OnSurface) == 0)
    {
        ClipFlags andClip = clipFlags;
        clipFlags &= tlTable.CheckClipping(*GScene->GetCamera(), clipFlags, andClip);
        if (andClip)
        {
            return;
        }
    }

    engine->PrepareMesh(render::SplitLegacy(spec));
    if (spec & (OnSurface | IsOnSurface))
    {
        engine->SetBias(0x10);
    }
    else
    {
        int bias = (spec & ZBiasMask) / ZBiasStep;
        // max. bias value is 3
        engine->SetBias(bias * 5);
    }

    tlTable.DoLighting(matSource, invTransform, lights, mesh, spec);

    // optimize for common case
    // no clipping - we can draw directly
    const FaceArray* drawFaces = this;
    FaceArray clippedFaces;
    if ((clipFlags & ClipAll) || (spec & OnSurface))
    {
        clippedFaces.ReserveFaces(0, false);
        if (spec & OnSurface)
        {
            float y = ((spec & IsShadow) ? engine->ZShadowEpsilon() : engine->ZRoadEpsilon());
            clippedFaces.SurfaceSplit(*this, tlTable, *GScene, clipFlags, y);
        }
        else
        {
            clippedFaces.Clip(*this, tlTable, *GScene->GetCamera(), clipFlags);
        }
        drawFaces = &clippedFaces;
    }

    if (drawFaces->Begin() < drawFaces->End())
    {
        tlTable.DoPerspective(*GScene->GetCamera(), clipFlags);
        engine->BeginMesh(tlTable, render::SplitLegacy(spec));
        Texture* lastTexture = (Texture*)-1; // something that is not equal to any valid texture
        int lastSpec = -1;
        int nSections = drawFaces->_sections.Size();
        // verify there are some sections
        DoAssert(nSections != 0);
        // verify all source shape sections are still there