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#include "frustum.h"
#include <algorithm>
#include <collections.h>
#include <glm/ext/matrix_transform.hpp>
static constexpr auto PLANES = std::array {0, 1, 2} * std::array {1.F, -1.F};
Frustum::Frustum(const glm::mat4 & view, const glm::mat4 & projection) :
view {view}, projection {projection}, viewProjection {}, inverseViewProjection {}, planes {}
{
updateCache();
}
void
Frustum::updateView(const glm::mat4 & newView)
{
view = newView;
updateCache();
}
void
Frustum::updateCache()
{
viewProjection = projection * view;
inverseViewProjection = glm::inverse(viewProjection);
std::ranges::transform(PLANES, planes.begin(), [vpt = glm::transpose(viewProjection)](const auto & idxs) {
const auto [idx, sgn] = idxs;
return vpt[3] + (vpt[idx] * sgn);
});
}
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