turanszkij
127 lines
3.5 KiB
C++
127 lines
3.5 KiB
C++
#include "wiFrustum.h"
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Frustum::Frustum()
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{
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}
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void Frustum::CleanUp()
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{
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}
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void Frustum::ConstructFrustum(float screenDepth, XMFLOAT4X4 projectionMatrix, const XMFLOAT4X4& viewMatrix, const XMMATRIX& world)
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{
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view=viewMatrix;
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float zMinimum, r;
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XMFLOAT4X4 matrix;
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// Calculate the minimum Z distance in the frustum.
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zMinimum = -projectionMatrix._43 / projectionMatrix._33;
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r = screenDepth / (screenDepth - zMinimum);
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projectionMatrix._33 = r;
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projectionMatrix._43 = -r * zMinimum;
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// Create the frustum matrix from the view matrix and updated projection matrix.
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XMStoreFloat4x4(&matrix, XMMatrixMultiply(XMMatrixMultiply(XMLoadFloat4x4(&viewMatrix),world), XMLoadFloat4x4(&projectionMatrix)));
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// Calculate near plane of frustum.
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m_planes[0].x = matrix._14 + matrix._13;
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m_planes[0].y = matrix._24 + matrix._23;
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m_planes[0].z = matrix._34 + matrix._33;
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m_planes[0].w = matrix._44 + matrix._43;
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XMStoreFloat4( &m_planesNorm[0],XMPlaneNormalize(XMLoadFloat4(&m_planes[0])) );
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// Calculate far plane of frustum.
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m_planes[1].x = matrix._14 - matrix._13;
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m_planes[1].y = matrix._24 - matrix._23;
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m_planes[1].z = matrix._34 - matrix._33;
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m_planes[1].w = matrix._44 - matrix._43;
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XMStoreFloat4( &m_planesNorm[1],XMPlaneNormalize(XMLoadFloat4(&m_planes[1])) );
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// Calculate left plane of frustum.
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m_planes[2].x = matrix._14 + matrix._11;
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m_planes[2].y = matrix._24 + matrix._21;
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m_planes[2].z = matrix._34 + matrix._31;
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m_planes[2].w = matrix._44 + matrix._41;
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XMStoreFloat4( &m_planesNorm[2],XMPlaneNormalize(XMLoadFloat4(&m_planes[2])) );
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// Calculate right plane of frustum.
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m_planes[3].x = matrix._14 - matrix._11;
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m_planes[3].y = matrix._24 - matrix._21;
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m_planes[3].z = matrix._34 - matrix._31;
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m_planes[3].w = matrix._44 - matrix._41;
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XMStoreFloat4( &m_planesNorm[3],XMPlaneNormalize(XMLoadFloat4(&m_planes[3])) );
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// Calculate top plane of frustum.
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m_planes[4].x = matrix._14 - matrix._12;
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m_planes[4].y = matrix._24 - matrix._22;
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m_planes[4].z = matrix._34 - matrix._32;
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m_planes[4].w = matrix._44 - matrix._42;
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XMStoreFloat4( &m_planesNorm[4],XMPlaneNormalize(XMLoadFloat4(&m_planes[4])) );
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// Calculate bottom plane of frustum.
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m_planes[5].x = matrix._14 + matrix._12;
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m_planes[5].y = matrix._24 + matrix._22;
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m_planes[5].z = matrix._34 + matrix._32;
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m_planes[5].w = matrix._44 + matrix._42;
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XMStoreFloat4( &m_planesNorm[5],XMPlaneNormalize(XMLoadFloat4(&m_planes[5])) );
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}
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bool Frustum::CheckPoint(const XMFLOAT3& point)
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{
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XMVECTOR p = XMLoadFloat3(&point);
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for(short i=0; i<6; i++)
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{
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if(XMVectorGetX( XMPlaneDotCoord(XMLoadFloat4(&m_planesNorm[i]), p) ) < 0.0f)
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{
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return false;
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}
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}
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return true;
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}
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bool Frustum::CheckSphere(const XMFLOAT3& center, float radius)
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{
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int i;
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XMVECTOR c = XMLoadFloat3(¢er);
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for(i=0; i<6; i++)
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{
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if(XMVectorGetX( XMPlaneDotCoord(XMLoadFloat4(&m_planesNorm[i]), c) ) < -radius)
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{
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return false;
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}
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}
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return true;
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}
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int Frustum::CheckBox(XMFLOAT3 corners[8]){
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int iTotalIn = 0;
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for(int p = 0; p < 6; ++p) {
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int iInCount = 8;
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int iPtIn = 1;
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for(int i = 0; i < 8; ++i) {
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if(XMVectorGetX( XMPlaneDotCoord(XMLoadFloat4(&m_planesNorm[p]), XMLoadFloat3(&corners[i])) ) < 0.0f)
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{
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iPtIn=0;
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--iInCount;
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}
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}
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if(iInCount == 0)
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return(false);
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iTotalIn += iPtIn;
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}
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if(iTotalIn == 6)
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return(BOX_FRUSTUM_INSIDE);
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return(BOX_FRUSTUM_INTERSECTS);
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}
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XMFLOAT4 Frustum::getFarPlane(){return m_planes[1];}
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XMFLOAT4 Frustum::getNearPlane(){return m_planes[0];}
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XMFLOAT3 Frustum::getCamPos(){
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return XMFLOAT3(-view._41,-view._42,-view._43);
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}
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