visual.cpp

/* Mondschein Engine is a fast, powerful, and easy-to-use 3D realtime rendering engine.
 *
 * Copyright (C) 2009-2013 by Andreas Amereller
 * E-Mail: andreas.amereller.dev@googlemail.com
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 3 of the License, or (at your option)
 * any later version.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "sdl/visual.h"
#include <GL/gl.h>

using namespace mondschein;
using namespace display;

SDL_Visual::SDL_Visual() : Visual(), renderer::Context(), visual()
{
  return;
}

SDL_Visual::SDL_Visual(const visual_attribs_t &_dsp,const renderer::context_attribs_t &_c) :
  Visual(_dsp), renderer::Context(_c), visual()
{
  return;
}

SDL_Visual::~SDL_Visual()
{
  SDL_FreeSurface(visual);
  return;
}

void SDL_Visual::init()
{
  visual_attribs_t dsp=get_visual_attribs();
  renderer::context_attribs_t c=renderer::Context::get_context_attribs();
  /* Set the visual flags */
  uint32 flags=SDL_HWACCEL|SDL_OPENGL;
  if (dsp.fullscreen) flags |= SDL_FULLSCREEN;

  /* Configure the context */
  SDL_GL_SetAttribute(SDL_GL_RED_SIZE,c.color_depth(0));
  SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE,c.color_depth(1));
  SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE,c.color_depth(2));
  SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE,c.color_depth(3));
  SDL_GL_SetAttribute(SDL_GL_ACCUM_RED_SIZE,c.accum_depth(0));
  SDL_GL_SetAttribute(SDL_GL_ACCUM_GREEN_SIZE,c.accum_depth(1));
  SDL_GL_SetAttribute(SDL_GL_ACCUM_BLUE_SIZE,c.accum_depth(2));
  SDL_GL_SetAttribute(SDL_GL_ACCUM_ALPHA_SIZE,c.accum_depth(3));
  SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE,c.depth_buffer_size);
  SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE,c.stencil_buffer_size);
  if (c.doublebuffer) SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER,1);
  else SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER,0);

  /* Create the context and visual */
  visual=SDL_SetVideoMode(dsp.width,dsp.height,dsp.bpp,flags);
  if (visual == NULL)
  {
    std::string err("Mondschein Engine ERROR: ");
    err+="Video mode or GL visual not supported";
    err+=", exception raised in function\n\t";
    err+="void mondschein::display::SDL_Visual::init()";
    throw boost::enable_current_exception(exception()) << exception_error(err);
  }
  /* Write back the real visual and context configuration */
  int db=0;
  dsp.width=visual->w;
  dsp.height=visual->h;
  dsp.bpp=visual->format->BitsPerPixel;
  dsp.fullscreen=visual->flags&SDL_FULLSCREEN;
  set_visual_attribs(dsp);

  SDL_GL_GetAttribute(SDL_GL_RED_SIZE,&c.color_depth(0));
  SDL_GL_GetAttribute(SDL_GL_GREEN_SIZE,&c.color_depth(1));
  SDL_GL_GetAttribute(SDL_GL_BLUE_SIZE,&c.color_depth(2));
  SDL_GL_GetAttribute(SDL_GL_ALPHA_SIZE,&c.color_depth(3));
  SDL_GL_GetAttribute(SDL_GL_ACCUM_RED_SIZE,&c.accum_depth(0));
  SDL_GL_GetAttribute(SDL_GL_ACCUM_GREEN_SIZE,&c.accum_depth(1));
  SDL_GL_GetAttribute(SDL_GL_ACCUM_BLUE_SIZE,&c.accum_depth(2));
  SDL_GL_GetAttribute(SDL_GL_ACCUM_ALPHA_SIZE,&c.accum_depth(3));
  SDL_GL_GetAttribute(SDL_GL_DEPTH_SIZE,&c.depth_buffer_size);
  SDL_GL_GetAttribute(SDL_GL_STENCIL_SIZE,&c.stencil_buffer_size);
  SDL_GL_GetAttribute(SDL_GL_DOUBLEBUFFER,&db);
  c.doublebuffer=db;
  renderer::Context::set_context_attribs(c);
  return;
}

void SDL_Visual::update()
{
  SDL_FreeSurface(visual);
  try
  {
    init();
  }
  catch (exception &e)
  {
    std::string err(*boost::get_error_info<exception_error>(e));
    err+=", called in function\n\t";
    err+="void mondschein::display::SDL_Visual::update()";
    throw boost::enable_current_exception(e) << exception_error(err);
  }
  return;
}

void SDL_Visual::make_current()
{
  #ifdef DEBUG
  std::cerr<<"Mondschein Engine DEBUG: SDL visuals cannot be made current."<<std::endl;
  #endif // DEBUG
}

void SDL_Visual::draw()
{
  SDL_GL_SwapBuffers();
  return;
}