alexpete
113 lines
4.0 KiB
C++
113 lines
4.0 KiB
C++
/*
|
|
* All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
|
|
* its licensors.
|
|
*
|
|
* For complete copyright and license terms please see the LICENSE at the root of this
|
|
* distribution (the "License"). All use of this software is governed by the License,
|
|
* or, if provided, by the license below or the license accompanying this file. Do not
|
|
* remove or modify any license notices. This file is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
*
|
|
*/
|
|
// Original file Copyright Crytek GMBH or its affiliates, used under license.
|
|
|
|
// Description : calculated the tangent space base vector for a given mesh
|
|
// Dependencies : none
|
|
// Documentation : "How to calculate tangent base vectors.doc"
|
|
|
|
|
|
#ifndef CRYINCLUDE_CRY3DENGINE_MESHCOMPILER_TANGENTSPACECALCULATION_H
|
|
#define CRYINCLUDE_CRY3DENGINE_MESHCOMPILER_TANGENTSPACECALCULATION_H
|
|
#pragma once
|
|
|
|
|
|
enum eCalculateTangentSpaceErrorCode
|
|
{
|
|
CALCULATE_TANGENT_SPACE_NO_ERRORS,
|
|
BROKEN_TEXTURE_COORDINATES,
|
|
VERTICES_SHARING_COORDINATES,
|
|
ALL_VERTICES_ON_THE_SAME_VECTOR,
|
|
MEMORY_ALLOCATION_FAILED
|
|
};
|
|
|
|
class ITriangleInputProxy
|
|
{
|
|
public:
|
|
virtual ~ITriangleInputProxy(){}
|
|
|
|
virtual uint32 GetTriangleCount() const = 0;
|
|
virtual void GetTriangleIndices(const uint32 indwTriNo, uint32 outdwPos[3], uint32 outdwNorm[3], uint32 outdwUV[3]) const = 0;
|
|
virtual void GetPos(const uint32 indwPos, Vec3& outfPos) const = 0;
|
|
virtual void GetUV(const uint32 indwPos, Vec2& outfUV) const = 0;
|
|
virtual void GetNorm(const uint32 indwTriNo, const uint32 indwVertNo, Vec3& outfNorm) const = 0;
|
|
};
|
|
|
|
class CTangentSpaceCalculation
|
|
{
|
|
public:
|
|
//! /param inInput - the normals are only used as smoothing input - we calculate the normals ourself
|
|
eCalculateTangentSpaceErrorCode CalculateTangentSpace(const ITriangleInputProxy& inInput, const bool bUseCustomNormals, string& errorMessage);
|
|
|
|
size_t GetBaseCount();
|
|
void GetTriangleBaseIndices(const uint32 indwTriNo, uint32 outdwBase[3]);
|
|
|
|
//! returns a orthogonal base (perpendicular and normalized)
|
|
void GetBase(const uint32 indwPos, float* outU, float* outV, float* outN);
|
|
|
|
private:
|
|
|
|
struct CBase33
|
|
{
|
|
CBase33();
|
|
CBase33(const Vec3& Uval, const Vec3& Vval, const Vec3& Nval);
|
|
|
|
Vec3 u;
|
|
Vec3 v;
|
|
Vec3 n; // part of the tangent base but can be used also as vertex normal
|
|
};
|
|
|
|
struct CVec3PredicateLess
|
|
{
|
|
bool operator() (const Vec3& first, const Vec3& second) const;
|
|
};
|
|
|
|
struct CBase33PredicateLess
|
|
{
|
|
bool operator() (const CBase33& first, const CBase33& second) const;
|
|
};
|
|
|
|
struct CBaseIndex
|
|
{
|
|
// position index in the positions stream
|
|
uint32 m_posIndex;
|
|
// normal index in the vertex normals stream
|
|
uint32 m_normIndex;
|
|
};
|
|
|
|
struct CBaseIndexOrder
|
|
{
|
|
bool operator() (const CBaseIndex& a, const CBaseIndex& b) const;
|
|
};
|
|
|
|
struct CTriBaseIndex
|
|
{
|
|
uint32 p[3]; //!< index in m_BaseVectors
|
|
};
|
|
|
|
// [dwTriangleCount]
|
|
std::vector<CTriBaseIndex> m_trianglesBaseAssigment;
|
|
// [0..] generated output data
|
|
std::vector<CBase33> m_baseVectors;
|
|
|
|
eCalculateTangentSpaceErrorCode CalculateTangentSpaceMikk(const ITriangleInputProxy& inInput, string& errorMessage);
|
|
|
|
CBase33& GetBase(std::multimap<CBaseIndex, uint32, CBaseIndexOrder>& inMap, const uint32 indwPosNo, const uint32 indwNormNo);
|
|
uint32 AddUV2Base(std::multimap<CBaseIndex, uint32, CBaseIndexOrder>& inMap, const uint32 indwPosNo, const uint32 indwNormNo, const Vec3& inU, const Vec3& inV, const Vec3& inNormN);
|
|
void AddNormal2Base(std::multimap<CBaseIndex, uint32, CBaseIndexOrder>& inMap, const uint32 indwPosNo, const uint32 indwNormNo, const Vec3& inNormal);
|
|
Vec3 Rotate(const Vec3& vFrom, const Vec3& vTo, const Vec3& vInput);
|
|
void DebugMesh(const ITriangleInputProxy& inInput) const;
|
|
float CalcAngleBetween(const Vec3& invA, const Vec3& invB);
|
|
};
|
|
|
|
#endif // CRYINCLUDE_CRY3DENGINE_MESHCOMPILER_TANGENTSPACECALCULATION_H
|