/*
Copyright (C) 2001-2006, William Joseph.
All Rights Reserved.

This file is part of GtkRadiant.

GtkRadiant 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 2 of the License, or
(at your option) any later version.

GtkRadiant 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 GtkRadiant; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

#if !defined(INCLUDED_IGLRENDER_H)
#define INCLUDED_IGLRENDER_H

#include "igl.h"
#include "generic/vector.h"
class AABB;
class Matrix4;


class GLProgram
{
public:
  virtual void enable() = 0;
  virtual void disable() = 0;
  virtual void setParameters(const Vector3& viewer, const Matrix4& localToWorld, const Vector3& origin, const Vector3& colour, const Matrix4& world2light) = 0;
};

class OpenGLFogState
{
public:
  OpenGLFogState() : mode(GL_EXP), density(0), start(0), end(0), index(0), colour(1, 1, 1, 1)
  {
  }
  GLenum mode;
  GLfloat density;
  GLfloat start;
  GLfloat end;
  GLint index;
  Vector4 colour;
};

//! A collection of opengl state information.
class OpenGLState
{
public:
  enum ESort
  {
    eSortFirst = 0,
    eSortOpaque = 1,
    eSortMultiFirst = 2,
    eSortMultiLast = 1023,
    eSortOverbrighten = 1024,
    eSortFullbright = 1025,
    eSortHighlight = 1026,
    eSortTranslucent = 1027,
    eSortOverlayFirst = 1028,
    eSortOverlayLast = 2047,
    eSortControlFirst = 2048,
    eSortControlLast = 3071,
    eSortGUI0 = 3072,
    eSortGUI1 = 3073,
    eSortLast = 4096,
  };

  unsigned int m_state;
  std::size_t m_sort;
  GLint m_texture;
  GLint m_texture1;
  GLint m_texture2;
  GLint m_texture3;
  GLint m_texture4;
  GLint m_texture5;
  GLint m_texture6;
  GLint m_texture7;
  Vector4 m_colour;
  GLenum m_blend_src, m_blend_dst;
  GLenum m_depthfunc;
  GLenum m_alphafunc;
  GLfloat m_alpharef;
  GLfloat m_linewidth;
  GLfloat m_pointsize;
  GLint m_linestipple_factor;
  GLushort m_linestipple_pattern;
  OpenGLFogState m_fog;
  GLProgram* m_program;

  OpenGLState() : m_program(0)
  {
  }
};

class OpenGLStateLibrary
{
public:
  INTEGER_CONSTANT(Version, 1);
  STRING_CONSTANT(Name, "openglshaderlibrary");

  virtual void getDefaultState(OpenGLState& state) const = 0;

  virtual void insert(const char* name, const OpenGLState& state) = 0;
  virtual void erase(const char* name) = 0;
};

#include "modulesystem.h"

template<typename Type>
class GlobalModule;
typedef GlobalModule<OpenGLStateLibrary> GlobalOpenGLStateLibraryModule;

template<typename Type>
class GlobalModuleRef;
typedef GlobalModuleRef<OpenGLStateLibrary> GlobalOpenGLStateLibraryModuleRef;

inline OpenGLStateLibrary& GlobalOpenGLStateLibrary()
{
  return GlobalOpenGLStateLibraryModule::getTable();
}

#endif