56 lines
3.1 KiB
C
56 lines
3.1 KiB
C
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/****************************************************************************
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Copyright (c) 2011-2013,WebJet Business Division,CYOU
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http://www.genesis-3d.com.cn
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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
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all 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
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THE SOFTWARE.
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****************************************************************************/
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#ifndef _H_SHADOWMAPUTIL_
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#define _H_SHADOWMAPUTIL_
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#include "math/matrix44.h"
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//------------------------------------------------------------------------------
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namespace AppUtil
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{
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static int s_cascadePartitionsZeroToOne[8] = {10, 30, 50, 100, 100, 100, 100, 100};
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static float s_cascadePartitionsFrustum[8] = {100000.f, 100000.f, 100000.f, 100000.f, 100000.f, 100000.f, 100000.f, 100000.f};
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static float s_cascadePartitionsZeroToOne_x[5] = { 0.0f, 5.0f/100.0f, 15.0f/100.0f, 60.0f/100.0f, 1.0f };
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static float s_cascadePartitionsFrustum_x[8] = {100000.f, 100000.f, 100000.f, 100000.f, 100000.f, 100000.f, 100000.f, 100000.f};
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//TODO:this is only support in 32bit system
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static const Math::float4 S_C_FLOAT4MAX(3.402823466e+38F, 3.402823466e+38F, 3.402823466e+38F, 3.402823466e+38F);
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static const Math::float4 S_C_FLOAT4MIN(-3.402823466e+38F, -3.402823466e+38F, -3.402823466e+38F, -3.402823466e+38F);
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class ShadowMapUtil
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{
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public:
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/// this function simply converts the center and extents of an AABB into 8 points
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static void CalculateAABBPoints(Math::float4* aabbPoints, const Math::float4& sceneCenter, const Math::float4& sceneExtends);
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static void CreateFrustumPointsFromCascadeInterval( float fCascadeIntervalBegin, float fCascadeIntervalEnd, const Math::matrix44 &vProjection,Math::float4* pvCornerPointsWorld);
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// Compute the near and far plane by intersecting an Ortho Projection with the Scenes AABB.
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static void ComputeNearAndFar( float& fNearPlane, float& fFarPlane, Math::float4 vLightCameraOrthographicMin, Math::float4 vLightCameraOrthographicMax, Math::float4* pvPointsInCameraView );
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// Compute a sphere from the eight points of frustum
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static void CalculateCloseSphereFromFrustum(const Math::float4 points[8], Math::float4& outCenter, float& outRadius);
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};
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} // namespace AppUtil
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//------------------------------------------------------------------------------
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#endif // _H_SHADOWMAPUTIL_
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