Fog.cpp

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/* This file is part of the Zenipex Library (zenilib).
 * Copyright (C) 2011 Mitchell Keith Bloch (bazald).
 *
 * zenilib is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * zenilib 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with zenilib.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <zeni_graphics.h>

#ifndef DISABLE_DX9
#include <d3dx9.h>
#endif

#ifndef DISABLE_GL
#if defined(REQUIRE_GL_ES)
#include <GLES/gl.h>
#else
#include <GL/glew.h>
#endif
#endif

namespace Zeni {

  Fog::Fog(const Color &color_, 
    const float &density_,
    const FOG_TYPE &type_,
    const float &start_,
    const float &end_)
    : type(type_),
    color(color_),
    density(density_),
    start(start_),
    end(end_)
  {
  }

#ifndef DISABLE_GL_FIXED
  void Fog::set(Video_GL_Fixed &) const {
    const int mode = type == FOG_EXP ? GL_EXP
      : type == FOG_EXP2 ? GL_EXP2
      : GL_LINEAR;

    glFogi(GL_FOG_MODE, mode);

    if(type == FOG_LINEAR) {
      glFogf(GL_FOG_START, start);
      glFogf(GL_FOG_END, end);
    }
    else
      glFogf(GL_FOG_DENSITY, density);

    glFogfv(GL_FOG_COLOR, reinterpret_cast<const GLfloat *>(&color));
    glHint(GL_FOG_HINT, GL_NICEST);
  }
#endif

#ifndef DISABLE_GL_SHADER
  void Fog::set(Video_GL_Shader &vgl) const {
    set(reinterpret_cast<Video_GL_Fixed &>(vgl));
  }
#endif

#ifndef DISABLE_DX9
  void Fog::set(Video_DX9 &screen) const {
    const DWORD mode = type == FOG_EXP ? D3DFOG_EXP
      : type == FOG_EXP2 ? D3DFOG_EXP2
      : D3DFOG_LINEAR;

    screen.get_d3d_device()->SetRenderState(D3DRS_FOGTABLEMODE, mode);

    if(type == FOG_LINEAR) {
      screen.get_d3d_device()->SetRenderState(D3DRS_FOGSTART, *(DWORD *)(&start));
      screen.get_d3d_device()->SetRenderState(D3DRS_FOGEND, *(DWORD *)(&end));
    }
    else
      screen.get_d3d_device()->SetRenderState(D3DRS_FOGDENSITY, *(DWORD *)(&density));

    screen.get_d3d_device()->SetRenderState(D3DRS_FOGCOLOR, color.get_argb());
  }
#endif

}