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https://github.com/Relintai/godot-lportal.git
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102 lines
3.1 KiB
C++
102 lines
3.1 KiB
C++
#pragma once
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// Copyright (c) 2019 Lawnjelly
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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//#define LMAINCAMERA_CALC_LUT
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// we get the main camera clipping planes and derive the points from 3 plane equations
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// in order to cull shadow casters to the camera frustum
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class LMainCamera
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{
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public:
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// same order as godot
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enum ePlane {
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P_NEAR,
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P_FAR,
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P_LEFT,
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P_TOP,
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P_RIGHT,
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P_BOTTOM,
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P_TOTAL,
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};
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// same order as godot
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enum ePoint {
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PT_FAR_LEFT_TOP,
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PT_FAR_LEFT_BOTTOM,
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PT_FAR_RIGHT_TOP,
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PT_FAR_RIGHT_BOTTOM,
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PT_NEAR_LEFT_TOP,
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PT_NEAR_LEFT_BOTTOM,
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PT_NEAR_RIGHT_TOP,
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PT_NEAR_RIGHT_BOTTOM,
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};
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static const char * m_szPlanes[];
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static const char * m_szPoints[];
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// 6 bits, 6 planes
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enum { NUM_CAM_PLANES = 6,
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NUM_CAM_POINTS = 8,
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MAX_CULL_PLANES = 16,
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LUT_SIZE = 64,
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};
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// create the LUT
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LMainCamera();
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bool Prepare(LRoomManager &manager, Camera * pCam);
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// main use of this object, we can create a clipping volume that is a mix of the light frustum and the camera volume
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bool AddCameraLightPlanes(LRoomManager &manager, const LSource &lsource, LVector<Plane> &planes) const;
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LVector<Plane> m_Planes;
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LVector<Vector3> m_Points;
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// centre of camera frustum
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Vector3 m_ptCentre;
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private:
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bool AddCameraLightPlanes_Directional(LRoomManager &manager, const LSource &lsource, LVector<Plane> &planes) const;
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String String_PlaneBF(unsigned int BF);
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#ifdef LMAINCAMERA_CALC_LUT
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void GetNeighbours(ePlane p, ePlane neigh_planes[4]) const;
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void GetCornersOfPlanes( ePlane _fpPlane0, ePlane _fpPlane1, ePoint _fpRet[2] ) const;
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void CreateLUT();
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void CompactLUT_Entry(int n);
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void DebugPrintLUT();
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void DebugPrintLUT_AsTable();
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void AddLUT(int p0, int p1, ePoint pts[2]);
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void AddLUT_Entry(unsigned int n, ePoint pts[2]);
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String DebugStringLUT_Entry(const LVector<uint8_t> &entry);
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String String_LUTEntry(const LVector<uint8_t> &entry);
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// contains a list of points for each combination of plane facing directions
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LVector<uint8_t> m_LUT[LUT_SIZE];
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#endif
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// precalculated LUT
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static uint8_t m_LUT_EntrySizes[LUT_SIZE];
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static uint8_t m_LUT_Entries[LUT_SIZE][8];
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};
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