igl.h

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/*
 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_IGL_H)
#define INCLUDED_IGL_H

#include <cstddef>
#include <string.h>
#include "generic/constant.h"

#ifdef __APPLE__
# include <OpenGL/gl.h>
#else
# include <GL/gl.h>
#endif

#if defined(WIN32)
#define QGL_DLLEXPORT __stdcall
#include <GL/glext.h>
#else
#define QGL_DLLEXPORT
#endif

#define glActiveTexture GlobalOpenGL().m_glActiveTexture
#define glClientActiveTexture GlobalOpenGL().m_glClientActiveTexture

struct OpenGLBinding
{
        INTEGER_CONSTANT(Version, 2);
        STRING_CONSTANT(Name, "qgl");

        int major_version, minor_version;

        bool contextValid;

        OpenGLBinding () :
            contextValid(false)
        {
        }

        void (*assertNoErrors) ();

        GLuint m_font;
        int m_fontHeight;

        void drawString (const std::string string) const
        {
            glListBase(m_font);
            glCallLists(GLsizei(string.length()), GL_UNSIGNED_BYTE, reinterpret_cast<const GLubyte*> (string.c_str()));
        }

        void drawChar (char character) const
        {
            glListBase(m_font);
            glCallLists(1, GL_UNSIGNED_BYTE, reinterpret_cast<const GLubyte*> (&character));
        }

        void perspective (GLdouble fovy, GLdouble yaspect, GLdouble zNear, GLdouble zFar)
        {
            GLdouble xmin, xmax, ymin, ymax;

            xmax = zNear * tan(fovy * 3.14159265 / 360.0);
            xmin = -xmax;

            ymin = xmin * yaspect;
            ymax = xmax * yaspect;

            glFrustum(xmin, xmax, ymin, ymax, zNear, zFar);
        }

        // GL_ARB_multitexture
        void (QGL_DLLEXPORT *m_glActiveTexture) (GLenum texture);
        void (QGL_DLLEXPORT *m_glClientActiveTexture) (GLenum texture);

        bool support_ARB_multitexture;
        bool ARB_multitexture ()
        {
            return support_ARB_multitexture;
        }

        // ARB_texture_compression
        bool support_ARB_texture_compression;
        bool ARB_texture_compression ()
        {
            return support_ARB_texture_compression;
        }

        // EXT_texture_compression_s3tc
        bool support_EXT_texture_compression_s3tc;
        bool EXT_texture_compression_s3tc ()
        {
            return support_EXT_texture_compression_s3tc;
        }

        // GL 1.2
        bool support_GL_1_2;
        bool GL_1_2 ()
        {
            return support_GL_1_2;
        }

        // GL 1.3
        bool support_GL_1_3;
        bool GL_1_3 ()
        {
            return support_GL_1_3;
        }

        // GL 1.4
        bool support_GL_1_4;
        bool GL_1_4 ()
        {
            return support_GL_1_4;
        }

        // GL 1.5
        bool support_GL_1_5;
        bool GL_1_5 ()
        {
            return support_GL_1_5;
        }

        // GL_ARB_vertex_program
        bool support_ARB_vertex_program;
        bool ARB_vertex_program ()
        {
            return support_ARB_vertex_program;
        }

        // GL_ARB_fragment_program
        bool support_ARB_fragment_program;
        bool ARB_fragment_program ()
        {
            return support_ARB_fragment_program;
        }

        // GL_ARB_shader_objects
        bool support_ARB_shader_objects;
        bool ARB_shader_objects ()
        {
            return support_ARB_shader_objects;
        }

        // GL_ARB_vertex_shader
        bool support_ARB_vertex_shader;
        bool ARB_vertex_shader ()
        {
            return support_ARB_vertex_shader;
        }

        // ARB_fragment_shader
        bool support_ARB_fragment_shader;
        bool ARB_fragment_shader ()
        {
            return support_ARB_fragment_shader;
        }

        // ARB_shading_language_100
        bool support_ARB_shading_language_100;
        bool ARB_shading_language_100 ()
        {
            return support_ARB_shading_language_100;
        }
};

#include "modulesystem.h"

template<typename Type>
class GlobalModule;
typedef GlobalModule<OpenGLBinding> GlobalOpenGLModule;

template<typename Type>
class GlobalModuleRef;
typedef GlobalModuleRef<OpenGLBinding> GlobalOpenGLModuleRef;

inline OpenGLBinding& GlobalOpenGL ()
{
    return GlobalOpenGLModule::getTable();
}

#endif