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#pragma once
#include "irenderview.h"
#include "math/Frustum.h"
#include "math/ViewProjection.h"
#include "math/Viewer.h"
#if 0
#define DEBUG_CULLING
#endif
#ifdef DEBUG_CULLING
#include <fmt/format.h>
#define INC_COUNTER(x) (++(const_cast<View*>(this)->x))
#else
#define INC_COUNTER(x)
#endif
namespace render
{
/// \brief View-volume culling and transformations.
class View: public IRenderView
{
private:
/// modelview matrix
Matrix4 _modelview;
/// projection matrix
Matrix4 _projection;
/// device-to-screen transform
Matrix4 _viewport;
Matrix4 _scissor;
/// combined modelview and projection matrix
ViewProjection _viewproj;
/// camera position in world space
Viewer _viewer;
/// view frustum in world space
Frustum _frustum;
bool _fill;
#ifdef DEBUG_CULLING
int _count_planes;
int _count_oriented_planes;
int _count_bboxs;
int _count_oriented_bboxs;
#endif
public:
View(bool fill = false) :
_modelview(Matrix4::getIdentity()),
_projection(Matrix4::getIdentity()),
_scissor(Matrix4::getIdentity()),
_fill(fill)
{}
View(const View& other) = default;
View(const VolumeTest& other) :
_modelview(other.GetModelview()),
_projection(other.GetProjection()),
_viewport(other.GetViewport()),
_scissor(Matrix4::getIdentity()),
_fill(other.fill())
{
// calculate _viewproj, _viewer and _frustum
construct();
}
void construct(const Matrix4& projection, const Matrix4& modelview, std::size_t width, std::size_t height) override
{
// modelview
_modelview = modelview;
// projection
_projection = projection;
// viewport
_viewport = Matrix4::getIdentity();
_viewport[0] = float(width / 2);
_viewport[5] = float(height / 2);
if (fabs(_projection[11]) > 0.0000001)
_viewport[10] = _projection[0] * _viewport[0];
else
_viewport[10] = 1 / _projection[10];
construct();
}
void EnableScissor(double min_x, double max_x, double min_y, double max_y)
{
_scissor = Matrix4::getIdentity();
_scissor[0] = (max_x - min_x) * 0.5;
_scissor[5] = (max_y - min_y) * 0.5;
_scissor[12] = (min_x + max_x) * 0.5;
_scissor[13] = (min_y + max_y) * 0.5;
_scissor.invertFull();
construct();
}
void DisableScissor()
{
_scissor = Matrix4::getIdentity();
construct();
}
bool TestPoint(const Vector3& point) const override
{
return _viewproj.testPoint(point);
}
bool TestLine(const Segment& segment) const override
{
return _frustum.testLine(segment);
}
bool TestPlane(const Plane3& plane) const override
{
INC_COUNTER(_count_planes);
return _viewer.testPlane(plane);
}
bool TestPlane(const Plane3& plane, const Matrix4& localToWorld) const override
{
INC_COUNTER(_count_oriented_planes);
return _viewer.testPlane(plane, localToWorld);
}
VolumeIntersectionValue TestAABB(const AABB& aabb) const override
{
INC_COUNTER(_count_bboxs);
return _frustum.testIntersection(aabb);
}
VolumeIntersectionValue TestAABB(const AABB& aabb, const Matrix4& localToWorld) const override
{
INC_COUNTER(_count_oriented_bboxs);
return _frustum.testIntersection(aabb, localToWorld);
}
const Matrix4& GetViewProjection() const override
{
return _viewproj;
}
const Matrix4& GetViewport() const override
{
return _viewport;
}
const Matrix4& GetModelview() const override
{
return _modelview;
}
const Matrix4& GetProjection() const override
{
return _projection;
}
bool fill() const override
{
return _fill;
}
Vector3 getViewer() const override
{
return _viewer.getVector3();
}
const Frustum& getFrustum() const override
{
return _frustum;
}
std::string getCullStats() const override
{
std::string stats;
#if defined(DEBUG_CULLING)
stats = fmt::format("planes {0:d} + {1:d} | bboxs {2:d} + {3:d}",
_count_planes, _count_oriented_planes,
_count_bboxs, _count_oriented_bboxs);
#endif
return stats;
}
void resetCullStats()
{
#if defined(DEBUG_CULLING)
_count_planes = 0;
_count_oriented_planes = 0;
_count_bboxs = 0;
_count_oriented_bboxs = 0;
#endif
}
private:
void construct()
{
_viewproj = _scissor.getMultipliedBy(_projection).getMultipliedBy(_modelview);
_frustum = Frustum::createFromViewproj(_viewproj);
_viewer = Viewer::createFromViewProjection(_viewproj);
}
};
} // namespace
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