vcl/inc/opengl/PackedTextureAtlas.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  */
  10
  11 #ifndef INCLUDED_VCL_INC_OPENGL_PACKEDTEXTUREATLAS_HXX
  12 #define INCLUDED_VCL_INC_OPENGL_PACKEDTEXTUREATLAS_HXX
  13
  14 #include <memory>
  15 #include <opengl/texture.hxx>
  16
  17 struct PackedTexture;
  18
  19 /**
  20  * Pack textures into one texture atlas.
  21  *
  22  * This is based on algorithm described in [1] and is an
  23  * adaptation of "texture atlas generator" from [2].
  24  *
  25  * [1]: http://www.blackpawn.com/texts/lightmaps/
  26  * [2]: https://github.com/lukaszdk/texture-atlas-generator
  27  *
  28  */
  29 class VCL_DLLPUBLIC PackedTextureAtlasManager final
  30 {
  31     std::vector<std::unique_ptr<PackedTexture>> maPackedTextures;
  32
  33     int const mnTextureWidth;
  34     int const mnTextureHeight;
  35
  36     void CreateNewTexture();
  37
  38     PackedTextureAtlasManager( const PackedTextureAtlasManager& ) = delete;
  39     PackedTextureAtlasManager& operator=( const PackedTextureAtlasManager& ) = delete;
  40
  41 public:
  42
  43     /**
  44      * nTextureWidth and nTextureHeight are the dimensions of the common texture(s)
  45      * nTextureLimit is the maximum limit of that a texture atlas can have (0 or less - unlimited)
  46      */
  47     PackedTextureAtlasManager(int nTextureWidth, int nTextureHeight);
  48     ~PackedTextureAtlasManager();
  49
  50     OpenGLTexture InsertBuffer(int nWidth, int nHeight, int nFormat, int nType, sal_uInt8 const * pData);
  51     OpenGLTexture Reserve(int nWidth, int nHeight);
  52     std::vector<GLuint> ReduceTextureNumber(int nMaxNumberOfTextures);
  53 };
  54
  55 #endif // INCLUDED_VCL_INC_OPENGL_PACKEDTEXTUREATLAS_HXX
  56
  57 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */