xbmc/cores/RetroPlayer/buffers/RenderBufferOpenGLES.cpp

   1 /*
   2  *  Copyright (C) 2005-2018 Team Kodi
   3  *  This file is part of Kodi - https://kodi.tv
   4  *
   5  *  SPDX-License-Identifier: GPL-2.0-or-later
   6  *  See LICENSES/README.md for more information.
   7  */
   8
   9 #include "RenderBufferOpenGLES.h"
  10
  11 #include "cores/RetroPlayer/rendering/RenderContext.h"
  12
  13 using namespace KODI;
  14 using namespace RETRO;
  15
  16 CRenderBufferOpenGLES::CRenderBufferOpenGLES(CRenderContext& context,
  17                                              GLuint pixeltype,
  18                                              GLuint internalformat,
  19                                              GLuint pixelformat,
  20                                              GLuint bpp)
  21   : m_context(context),
  22     m_pixeltype(pixeltype),
  23     m_internalformat(internalformat),
  24     m_pixelformat(pixelformat),
  25     m_bpp(bpp)
  26 {
  27 }
  28
  29 CRenderBufferOpenGLES::~CRenderBufferOpenGLES()
  30 {
  31   DeleteTexture();
  32 }
  33
  34 void CRenderBufferOpenGLES::CreateTexture()
  35 {
  36   glGenTextures(1, &m_textureId);
  37
  38   glBindTexture(m_textureTarget, m_textureId);
  39
  40   glTexImage2D(m_textureTarget, 0, m_internalformat, m_width, m_height, 0, m_pixelformat,
  41                m_pixeltype, NULL);
  42
  43   glTexParameteri(m_textureTarget, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  44   glTexParameteri(m_textureTarget, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  45   glTexParameteri(m_textureTarget, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  46   glTexParameteri(m_textureTarget, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
  47
  48   glBindTexture(m_textureTarget, 0);
  49 }
  50
  51 bool CRenderBufferOpenGLES::UploadTexture()
  52 {
  53   if (!glIsTexture(m_textureId))
  54     CreateTexture();
  55
  56   glBindTexture(m_textureTarget, m_textureId);
  57
  58   const int stride = GetFrameSize() / m_height;
  59
  60   glPixelStorei(GL_UNPACK_ALIGNMENT, m_bpp);
  61
  62   if (m_bpp == 4 && m_pixelformat == GL_RGBA)
  63   {
  64     // XOR Swap RGBA -> BGRA
  65     // GLES 2.0 doesn't support strided textures (unless GL_UNPACK_ROW_LENGTH_EXT is supported)
  66     uint8_t* pixels = const_cast<uint8_t*>(m_data.data());
  67     for (unsigned int y = 0; y < m_height; ++y, pixels += stride)
  68     {
  69       for (int x = 0; x < stride; x += 4)
  70         std::swap(pixels[x], pixels[x + 2]);
  71       glTexSubImage2D(m_textureTarget, 0, 0, y, m_width, 1, m_pixelformat, m_pixeltype, pixels);
  72     }
  73   }
  74   else if (m_context.IsExtSupported("GL_EXT_unpack_subimage"))
  75   {
  76 #ifdef GL_UNPACK_ROW_LENGTH_EXT
  77     glPixelStorei(GL_UNPACK_ROW_LENGTH_EXT, stride / m_bpp);
  78     glTexSubImage2D(m_textureTarget, 0, 0, 0, m_width, m_height, m_pixelformat, m_pixeltype,
  79                     m_data.data());
  80     glPixelStorei(GL_UNPACK_ROW_LENGTH_EXT, 0);
  81 #endif
  82   }
  83   else
  84   {
  85     uint8_t* pixels = const_cast<uint8_t*>(m_data.data());
  86     for (unsigned int y = 0; y < m_height; ++y, pixels += stride)
  87       glTexSubImage2D(m_textureTarget, 0, 0, y, m_width, 1, m_pixelformat, m_pixeltype, pixels);
  88   }
  89
  90   glBindTexture(m_textureTarget, 0);
  91
  92   return true;
  93 }
  94
  95 void CRenderBufferOpenGLES::DeleteTexture()
  96 {
  97   if (glIsTexture(m_textureId))
  98     glDeleteTextures(1, &m_textureId);
  99
 100   m_textureId = 0;
 101 }