Method DrawImpl

Source/Engine/Terrain/Terrain.cpp:617–658

}

void Terrain::DrawImpl(RenderContext& renderContext, HashSet<TerrainChunk*, RendererAllocation>& drawnChunks)
{
    // Collect chunks to render and calculate LOD/material for them (required to be done before to gather NeighborLOD)
    Array<TerrainChunk*, RendererAllocation> drawChunks;

    // Frustum vs Box culling for patches
    const BoundingFrustum frustum = renderContext.View.CullingFrustum;
    const Vector3 origin = renderContext.View.Origin;
    for (int32 patchIndex = 0; patchIndex < _patches.Count(); patchIndex++)
    {
        const auto patch = _patches[patchIndex];
        BoundingBox bounds(patch->_bounds.Minimum - origin, patch->_bounds.Maximum - origin);
        if (renderContext.View.IsCullingDisabled || frustum.Intersects(bounds))
        {
            // Skip if has no heightmap or it's not loaded
            if (patch->Heightmap == nullptr || patch->Heightmap->GetTexture()->ResidentMipLevels() == 0)
                continue;

            // Frustum vs Box culling for chunks
            for (int32 chunkIndex = 0; chunkIndex < Terrain::ChunksCount; chunkIndex++)
            {
                auto chunk = &patch->Chunks[chunkIndex];
                bounds = BoundingBox(chunk->_bounds.Minimum - origin, chunk->_bounds.Maximum - origin);
                if (renderContext.View.IsCullingDisabled || frustum.Intersects(bounds))
                {
                    if (!drawnChunks.Contains(chunk) && !chunk->PrepareDraw(renderContext))
                        continue;

                    // Add chunk for drawing
                    drawChunks.Add(chunk);
                    drawnChunks.Add(chunk);
                }
            }
        }
    }

    // Draw all visible chunks
    for (int32 i = 0; i < drawChunks.Count(); i++)
    {
        drawChunks.Get()[i]->Draw(renderContext);
    }
}

#if USE_EDITOR