vcl/inc/opengl/TextureState.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_TEXTURE_STATE_H
  12 #define INCLUDED_VCL_INC_OPENGL_TEXTURE_STATE_H
  13
  14 #include <vcl/opengl/OpenGLHelper.hxx>
  15
  16 class TextureState
  17 {
  18 private:
  19     GLuint mnCurrentTextureUnit;
  20     std::vector<GLuint> maBoundTextures;
  21
  22 public:
  23     TextureState()
  24         : mnCurrentTextureUnit(0)
  25         , maBoundTextures(4, 0)
  26     {
  27     }
  28
  29     static void generate(GLuint& nTexture)
  30     {
  31         glGenTextures(1, &nTexture);
  32         CHECK_GL_ERROR();
  33     }
  34
  35     void active(GLuint nTextureUnit)
  36     {
  37         if (mnCurrentTextureUnit != nTextureUnit)
  38         {
  39             glActiveTexture(GL_TEXTURE0 + nTextureUnit);
  40             CHECK_GL_ERROR();
  41             mnCurrentTextureUnit = nTextureUnit;
  42         }
  43     }
  44
  45     void bind(GLuint nTexture)
  46     {
  47         if (maBoundTextures[mnCurrentTextureUnit] != nTexture)
  48         {
  49             glBindTexture(GL_TEXTURE_2D, nTexture);
  50             CHECK_GL_ERROR();
  51             maBoundTextures[mnCurrentTextureUnit] = nTexture;
  52         }
  53     }
  54
  55     void unbindAndDelete(GLuint nTexture)
  56     {
  57         unbind(nTexture);
  58         glDeleteTextures(1, &nTexture);
  59     }
  60
  61     void unbind(GLuint nTexture)
  62     {
  63         for (size_t i = 0; i < maBoundTextures.size(); i++)
  64         {
  65             if (nTexture == maBoundTextures[i])
  66                 maBoundTextures[i] = 0;
  67         }
  68     }
  69 };
  70
  71 #endif // INCLUDED_VCL_INC_OPENGL_TEXTURE_STATE_H
  72
  73 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */