///////////////////////////////////////////////////////////////////////////

//

// Copyright (c) 2002, Industrial Light & Magic, a division of Lucas

// Digital Ltd. LLC

// 

// All rights reserved.

// 

// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions are

// met:

// *       Redistributions of source code must retain the above copyright

// notice, this list of conditions and the following disclaimer.

// *       Redistributions in binary form must reproduce the above

// copyright notice, this list of conditions and the following disclaimer

// in the documentation and/or other materials provided with the

// distribution.

// *       Neither the name of Industrial Light & Magic nor the names of

// its contributors may be used to endorse or promote products derived

// from this software without specific prior written permission. 

// 

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

//

///////////////////////////////////////////////////////////////////////////

#ifndef INCLUDED_IMATHGL_H

#define INCLUDED_IMATHGL_H

#include <GL/gl.h>

#include "ImathVec.h"

#include "ImathMatrix.h"

#include "IexMathExc.h"

#include "ImathFun.h"

#include "ImathNamespace.h"

inline void glVertex    ( const IMATH_INTERNAL_NAMESPACE::V3f &v ) { glVertex3f(v.x,v.y,v.z);   }

inline void glVertex    ( const IMATH_INTERNAL_NAMESPACE::V2f &v ) { glVertex2f(v.x,v.y);       }

inline void glNormal    ( const IMATH_INTERNAL_NAMESPACE::V3f &n ) { glNormal3f(n.x,n.y,n.z);   }

inline void glColor     ( const IMATH_INTERNAL_NAMESPACE::V3f &c ) { glColor3f(c.x,c.y,c.z);    }

inline void glTranslate ( const IMATH_INTERNAL_NAMESPACE::V3f &t ) { glTranslatef(t.x,t.y,t.z); }

inline void glTexCoord( const IMATH_INTERNAL_NAMESPACE::V2f &t )

{

    glTexCoord2f(t.x,t.y);

}

inline void glDisableTexture()

{

    glActiveTexture(GL_TEXTURE1);

    glBindTexture(GL_TEXTURE_2D, 0);

    glDisable(GL_TEXTURE_2D);

    glActiveTexture(GL_TEXTURE0);

}

namespace {

const float GL_FLOAT_MAX = 1.8e+19; // sqrt (FLT_MAX)

inline bool

badFloat (float f)

{

    return !IMATH_INTERNAL_NAMESPACE::finitef (f) || f < - GL_FLOAT_MAX || f > GL_FLOAT_MAX;

}

} // namespace

inline void

throwBadMatrix (const IMATH_INTERNAL_NAMESPACE::M44f& m)

{

    if (badFloat (m[0][0]) ||

	badFloat (m[0][1]) ||

	badFloat (m[0][2]) ||

	badFloat (m[0][3]) || 

	badFloat (m[1][0]) ||

	badFloat (m[1][1]) ||

	badFloat (m[1][2]) ||

	badFloat (m[1][3]) || 

	badFloat (m[2][0]) ||

	badFloat (m[2][1]) ||

	badFloat (m[2][2]) ||

	badFloat (m[2][3]) || 

	badFloat (m[3][0]) ||

	badFloat (m[3][1]) ||

	badFloat (m[3][2]) ||

	badFloat (m[3][3]))

	throw IEX_NAMESPACE::OverflowExc ("GL matrix overflow");

}

inline void 

glMultMatrix( const IMATH_INTERNAL_NAMESPACE::M44f& m ) 

{ 

    throwBadMatrix (m);

    glMultMatrixf( (GLfloat*)m[0] ); 

}

inline void 

glMultMatrix( const IMATH_INTERNAL_NAMESPACE::M44f* m ) 

{ 

    throwBadMatrix (*m);

    glMultMatrixf( (GLfloat*)(*m)[0] ); 

}

inline void 

glLoadMatrix( const IMATH_INTERNAL_NAMESPACE::M44f& m ) 

{ 

    throwBadMatrix (m);

    glLoadMatrixf( (GLfloat*)m[0] ); 

}

inline void 

glLoadMatrix( const IMATH_INTERNAL_NAMESPACE::M44f* m ) 

{ 

    throwBadMatrix (*m);

    glLoadMatrixf( (GLfloat*)(*m)[0] ); 

}

IMATH_INTERNAL_NAMESPACE_HEADER_ENTER

//

// Class objects that push/pop the GL state. These objects assist with

// proper cleanup of the state when exceptions are thrown.

//

class GLPushMatrix {

  public:

    GLPushMatrix ()			{ glPushMatrix(); }

    ~GLPushMatrix()			{ glPopMatrix(); }

};

class GLPushAttrib {

  public:

    GLPushAttrib (GLbitfield mask)	{ glPushAttrib (mask); }

    ~GLPushAttrib()			{ glPopAttrib(); }

};

class GLBegin {

  public:

    GLBegin (GLenum mode)		{ glBegin (mode); }

    ~GLBegin()				{ glEnd(); }

};

IMATH_INTERNAL_NAMESPACE_HEADER_EXIT

#endif