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#pragma once
#include <vector>
#include "math/Vector4.h"
#include "math/AABB.h"
#include "RenderableBox.h"
#include "RenderableGeometry.h"
namespace render
{
class RenderableBoundingBoxes :
public render::RenderableGeometry
{
private:
const std::vector<AABB>& _aabbs;
bool _needsUpdate;
Vector4 _colour;
public:
RenderableBoundingBoxes(const std::vector<AABB>& aabbs, const Vector4& colour = { 1,1,1,1 }) :
_aabbs(aabbs),
_needsUpdate(true),
_colour(colour)
{}
void queueUpdate()
{
_needsUpdate = true;
}
protected:
virtual Vector4 getBoxColour(std::size_t boxIndex)
{
return _colour;
}
void updateGeometry() override
{
if (!_needsUpdate) return;
_needsUpdate = false;
std::vector<RenderVertex> vertices;
std::vector<unsigned int> indices;
static auto WireframeBoxIndices = detail::generateWireframeBoxIndices();
vertices.reserve(_aabbs.size() * 8); // 8 vertices per box
indices.reserve(WireframeBoxIndices.size() * _aabbs.size()); // indices per box * boxes
for (auto i = 0; i < _aabbs.size(); ++i)
{
const auto& aabb = _aabbs.at(i);
// Calculate the corner vertices of this bounding box
Vector3 max(aabb.origin + aabb.extents);
Vector3 min(aabb.origin - aabb.extents);
auto boxVertices = detail::getWireframeBoxVertices(min, max, getBoxColour(i));
auto indexOffset = static_cast<unsigned int>(vertices.size());
vertices.insert(vertices.begin(),
std::make_move_iterator(boxVertices.begin()),
std::make_move_iterator(boxVertices.end()));
for (auto index : WireframeBoxIndices)
{
indices.push_back(indexOffset + index);
}
}
updateGeometryWithData(render::GeometryType::Lines, vertices, indices);
}
};
}
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