AWorld.cpp

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#include "pch.h"
#include "AWorld.h"
 
//-----------------------------------------------------------------------------
// Enables memory debugging.
// Note: Should be the last include!
//-----------------------------------------------------------------------------
#include <Core/TMemoryDebugOn.h>
 
TOSHI_NAMESPACE_USING
 
Frustum::Frustum()
{
    aFrustumPlanes[ 0 ].uiClipFlag = 0;
    aFrustumPlanes[ 1 ].uiClipFlag = 0;
    aFrustumPlanes[ 2 ].uiClipFlag = 0;
    aFrustumPlanes[ 3 ].uiClipFlag = 0;
    aFrustumPlanes[ 4 ].uiClipFlag = 0;
    aFrustumPlanes[ 5 ].uiClipFlag = 0;
    iActivePlaneCount              = 0;
}
 
void Frustum::InitReduce()
{
    iActivePlaneCount = 6;
 
    for ( TINT i = 0; i < iActivePlaneCount; i++ )
    {
        apActivePlanes[ i ] = &aFrustumPlanes[ i ].oPlane;
    }
}
 
FrustumIntersectSphereResult Frustum::IntersectSphereReduce( const Toshi::TSphere& a_rSphere )
{
    for ( TINT i = 0; i < iActivePlaneCount; )
    {
        TFLOAT fDistance = TVector4::DotProduct3( a_rSphere.AsVector4(), apActivePlanes[ i ]->AsVector4() ) - apActivePlanes[ i ]->GetD();
 
        if ( a_rSphere.GetRadius() < fDistance )
            return FISR_NOT_VISIBLE;
 
        if ( a_rSphere.GetRadius() <= -fDistance )
        {
            iActivePlaneCount--;
            TSwapValues( apActivePlanes[ i ], apActivePlanes[ iActivePlaneCount ] );
        }
        else
        {
            i += 1;
        }
    }
 
    if ( iActivePlaneCount == 0 )
        return FISR_ALL_VISIBLE;
 
    return FISR_PARTIALLY_VISIBLE;
}
 
void Frustum::Transform( const Frustum& a_rFrustum, const Toshi::TMatrix44& a_rMatrix )
{
    for ( TINT i = 0; i < 6; i++ )
    {
        TMatrix44::TransformPlaneOrthogonal(
            aFrustumPlanes[ i ].oPlane,
            a_rMatrix,
            a_rFrustum.aFrustumPlanes[ i ].oPlane
        );
 
        aFrustumPlanes[ i ].uiClipFlag = a_rFrustum.aFrustumPlanes[ i ].uiClipFlag;
    }
}