1 /*
2 Open Asset Import Library (assimp)
3 ----------------------------------------------------------------------
4 
5 Copyright (c) 2006-2017, assimp team
6 
7 All rights reserved.
8 
9 Redistribution and use of this software in source and binary forms,
10 with or without modification, are permitted provided that the
11 following conditions are met:
12 
13 * Redistributions of source code must retain the above
14   copyright notice, this list of conditions and the
15   following disclaimer.
16 
17 * Redistributions in binary form must reproduce the above
18   copyright notice, this list of conditions and the
19   following disclaimer in the documentation and/or other
20   materials provided with the distribution.
21 
22 * Neither the name of the assimp team, nor the names of its
23   contributors may be used to endorse or promote products
24   derived from this software without specific prior
25   written permission of the assimp team.
26 
27 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
28 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
29 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
30 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
31 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
32 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
33 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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37 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
38 
39 ----------------------------------------------------------------------
40 */
41 
42 
43 /** @file Defines a post processing step to calculate tangents and
44     bitangents on all imported meshes.*/
45 #ifndef AI_CALCTANGENTSPROCESS_H_INC
46 #define AI_CALCTANGENTSPROCESS_H_INC
47 
48 #include "BaseProcess.h"
49 
50 struct aiMesh;
51 
52 namespace Assimp
53 {
54 
55 // ---------------------------------------------------------------------------
56 /** The CalcTangentsProcess calculates the tangent and bitangent for any vertex
57  * of all meshes. It is expected to be run before the JoinVerticesProcess runs
58  * because the joining of vertices also considers tangents and bitangents for
59  * uniqueness.
60  */
61 class ASSIMP_API_WINONLY CalcTangentsProcess : public BaseProcess
62 {
63 public:
64 
65     CalcTangentsProcess();
66     ~CalcTangentsProcess();
67 
68 public:
69     // -------------------------------------------------------------------
70     /** Returns whether the processing step is present in the given flag.
71     * @param pFlags The processing flags the importer was called with.
72     *   A bitwise combination of #aiPostProcessSteps.
73     * @return true if the process is present in this flag fields,
74     *   false if not.
75     */
76     bool IsActive( unsigned int pFlags) const;
77 
78     // -------------------------------------------------------------------
79     /** Called prior to ExecuteOnScene().
80     * The function is a request to the process to update its configuration
81     * basing on the Importer's configuration property list.
82     */
83     void SetupProperties(const Importer* pImp);
84 
85 
86     // setter for configMaxAngle
SetMaxSmoothAngle(float f)87     inline void SetMaxSmoothAngle(float f)
88     {
89         configMaxAngle =f;
90     }
91 
92 protected:
93 
94     // -------------------------------------------------------------------
95     /** Calculates tangents and bitangents for a specific mesh.
96     * @param pMesh The mesh to process.
97     * @param meshIndex Index of the mesh
98     */
99     bool ProcessMesh( aiMesh* pMesh, unsigned int meshIndex);
100 
101     // -------------------------------------------------------------------
102     /** Executes the post processing step on the given imported data.
103     * @param pScene The imported data to work at.
104     */
105     void Execute( aiScene* pScene);
106 
107 private:
108 
109     /** Configuration option: maximum smoothing angle, in radians*/
110     float configMaxAngle;
111     unsigned int configSourceUV;
112 };
113 
114 } // end of namespace Assimp
115 
116 #endif // AI_CALCTANGENTSPROCESS_H_INC
117