| // Copyright 2016 The Android Open Source Project |
| // This software is licensed under the terms of the GNU General Public |
| // License version 2, as published by the Free Software Foundation, and |
| // may be copied, distributed, and modified under those terms. |
| // |
| // This program is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| #pragma once |
| |
| #include "GLES2/gl2.h" |
| |
| #include <QTextStream> |
| |
| // This function can be used to parse certain subset of the Wavefront OBJ format. |
| // See here for details: https://en.wikipedia.org/wiki/Wavefront_.obj_file |
| // It has the following limitations: |
| // 1. Materials are not supported. |
| // 2. Position coordinates must have only x, y and z (w defaults to 1) |
| // 3. Texture coordinates must have only u and v (w defaults to 0) |
| // 4. Parameter space vertices are not supported. |
| // 5. Only triangular faces are allowed. |
| // 6. A face must be specified as "f v1/vt1/vn1 v2/vt2/vn2 v3/vt3/vn3", where v* are |
| // the indices of position coordinates, vt* are the indices of texture |
| // coordinates and vn* are indices of normals. |
| // |stream| is the input stream from which the OBJ data is read |
| // |vtx_buf| is an output parameter, it will contain the vertex data in the |
| // following format: <X> <Y> <Z> <X'> <Y'> <Z'> <U> <V>. |
| // Where XYZ is position, X'Y'Z' is the normal and UV are texture |
| // coordinates. It is suitable for creating a buffer object of |
| // vertex data for a shader. |
| // |idx_buf| is an output parameter, it will contain indices for vertices |
| // from |vtxbuf|. It is suitable for creating an element array buffer |
| // for a shader. |
| // This function returns true if loading the mesh was successful, and false |
| // otherwise. |
| bool parseWavefrontOBJ(QTextStream& stream, |
| std::vector<float>& vtxbuf, |
| std::vector<GLuint>& idxbuf); |
