eVolve/window.cpp

/* Copyright (c) 2007-2011, Stefan Eilemann <eile@equalizergraphics.com> 
 *
 * 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 Eyescale Software GmbH 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 HOLDER 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.
 */

#include "window.h"

#include "error.h"
#include "pipe.h"

namespace eVolve
{

bool Window::configInit( const eq::uint128_t& initID )
{
    // Enforce alpha channel, since we need one for rendering
    setIAttribute( IATTR_PLANES_ALPHA, 8 );

    return eq::Window::configInit( initID );
}

bool Window::configInitGL( const eq::uint128_t& initID )
{
    Pipe*     pipe     = static_cast<Pipe*>( getPipe() );
    Renderer* renderer = pipe->getRenderer();

    if( !renderer )
        return false;

    if( !GLEW_ARB_shader_objects )
    {
        setError( ERROR_EVOLVE_ARB_SHADER_OBJECTS_MISSING );
        return false;
    }
    if( !GLEW_EXT_blend_func_separate )
    {
        setError( ERROR_EVOLVE_EXT_BLEND_FUNC_SEPARATE_MISSING );
        return false;
    }
    if( !GLEW_ARB_multitexture )
    {
        setError( ERROR_EVOLVE_ARB_MULTITEXTURE_MISSING );
        return false;
    }

    glEnable( GL_SCISSOR_TEST ); // needed to constrain channel viewport

    glClear( GL_COLOR_BUFFER_BIT );
    swapBuffers();
    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );

    renderer->glewSetContext( glewGetContext( ));

    if( !renderer->loadShaders( ))
    {
        setError( ERROR_EVOLVE_LOADSHADERS_FAILED );
        return false;
    }

    _loadLogo();
    return true;
}

namespace
{
#ifdef EQ_RELEASE
static const std::string _logoTextureName = std::string( EQ_INSTALL_DIR ) +
                                 std::string( "share/Equalizer/data/logo.rgb" );
#else
static const std::string _logoTextureName = std::string( EQ_SOURCE_DIR ) +
                                      std::string( "examples/eVolve/logo.rgb" );
#endif
}

void Window::_loadLogo()
{
    if( !GLEW_ARB_texture_rectangle )
    {
        EQWARN << "Can't load overlay logo, GL_ARB_texture_rectangle not "
               << "available" << std::endl;
        return;
    }

    eq::Window::ObjectManager* om = getObjectManager();
    _logoTexture = om->getEqTexture( _logoTextureName.c_str( ));
    if( _logoTexture )
        return;

    eq::Image image;
    if( !image.readImage( _logoTextureName, eq::Frame::BUFFER_COLOR ))
    {
        EQWARN << "Can't load overlay logo " << _logoTextureName << std::endl;
        return;
    }

    _logoTexture = om->newEqTexture( _logoTextureName.c_str(),
                                     GL_TEXTURE_RECTANGLE_ARB );
    EQASSERT( _logoTexture );
    
    image.upload(eq::Frame::BUFFER_COLOR, _logoTexture, eq::Vector2i::ZERO, om);
    EQVERB << "Created logo texture of size " << _logoTexture->getWidth() << "x"
           << _logoTexture->getHeight() << std::endl;
}


void Window::swapBuffers()
{
    const Pipe*         pipe      = static_cast<Pipe*>( getPipe( ));
    const FrameData&    frameData = pipe->getFrameData();
    const eq::Channels& channels  = getChannels();

    if( frameData.useStatistics() && !channels.empty( ))
        EQ_GL_CALL( channels.back()->drawStatistics( ));

    eq::Window::swapBuffers();
}
}