subPBuff.cpp

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///////////////////////////////////////////////////////////////////////////////
/// 10/02/02    Aaron Lefohn    Scientific Computing and Imaging Institute      
/// School of Computing                 University of Utah
///////////////////////////////////////////////////////////////////////////////

#include <state/subPBuff.h>
#include <iostream>

using namespace gutz;
using namespace std; 

namespace glift {

#ifndef NDEBUG
//      #define SPEW
#endif

SubPBuff::SubPBuff( PBuffGlift* pbuff, GLenum surface )
                : PBuffGlift( pbuff->pbuff() ),
                  m_origin( vec2i() ),
                  m_dimen(  pbuff->dimen() ),
                  m_glSurface(surface ),
                  m_wglSurface( getWglSurface(surface) )
{}

// Set the origin and dimen for the sub-buffer
SubPBuff::SubPBuff( PBuffGlift* pbuff, const vec2i& origin, const vec2i& dimen, GLenum surface )
                : PBuffGlift( pbuff->pbuff() ),
                  m_origin( origin ),
                  m_dimen(  dimen ),
                  m_glSurface(surface),
                  m_wglSurface( getWglSurface(surface) )
{}

SubPBuff::~SubPBuff() 
{}

// Convert GL surface name to WGL surface name
GLenum SubPBuff::getWglSurface( GLenum glSurf )
{
        GLenum wglSurf = 0;
        switch(glSurf) {
        case GL_FRONT_LEFT:     wglSurf = WGL_FRONT_LEFT_ARB; break;            
        case GL_FRONT_RIGHT:wglSurf = WGL_FRONT_RIGHT_ARB; break;
        case GL_BACK_LEFT:      wglSurf = WGL_BACK_LEFT_ARB; break;
        case GL_BACK_RIGHT:     wglSurf = WGL_BACK_RIGHT_ARB; break;
        case GL_AUX0:           wglSurf = WGL_AUX0_ARB; break;
        case GL_AUX1:           wglSurf = WGL_AUX1_ARB; break;
        case GL_AUX2:           wglSurf = WGL_AUX2_ARB; break;
        case GL_AUX3:           wglSurf = WGL_AUX3_ARB; break;
        case GL_FRONT:
        case GL_BACK:
        case GL_LEFT:
        case GL_RIGHT:
        case GL_FRONT_AND_BACK:
                err() << "getWglSurface(...) Error:\n\tCannot use multi-buffer surfaces(" << glSurf << ")\n";
                exit(1);
        default:
                err() << "getWglSurface(...) Error:\n\tUnrecognized GL surface (" << glSurf << ")\n";
                exit(1);
        };

        return wglSurf;
}

void SubPBuff::enable( bool saveState )
{
        PBuffGlift::enable(saveState);
        glReadBuffer( m_glSurface );
        glDrawBuffer( m_glSurface );
        glViewport( m_origin.x, m_origin.y, m_dimen.x, m_dimen.y );

#ifndef NDEBUG
#ifdef  SPEW
        err << "enable(...) Info: orig = " << m_origin.x << ", " << m_origin.y 
                 << ", dim = " << m_dimen.x << ", " << m_dimen.y << endl;
#endif
#endif
}

void SubPBuff::bindDef()
{
        setSurface( m_wglSurface );
        PBuffGlift::bindDef();
}

void SubPBuff::releaseDef()
{
        setSurface( m_wglSurface );
        PBuffGlift::releaseDef();
        setSurface( WGL_FRONT_LEFT_ARB );
}


} // End of namespace glift

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