VolumeMeshNodeGLCompatT_impl.hh

/*===========================================================================*\
 *                                                                           *
 *                              OpenFlipper                                  *
 *           Copyright (c) 2001-2015, RWTH-Aachen University                 *
 *           Department of Computer Graphics and Multimedia                  *
 *                          All rights reserved.                             *
 *                            www.openflipper.org                            *
 *                                                                           *
 *---------------------------------------------------------------------------*
 * This file is part of OpenFlipper.                                         *
 *---------------------------------------------------------------------------*
 *                                                                           *
 * Redistribution and use in source and binary forms, with or without        *
 * modification, are permitted provided that the following conditions        *
 * are met:                                                                  *
 *                                                                           *
 * 1. Redistributions of source code must retain the above copyright notice, *
 *    this list of conditions and the following disclaimer.                  *
 *                                                                           *
 * 2. 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.   *
 *                                                                           *
 * 3. Neither the name of the copyright holder 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 "VolumeMeshNode.hh"

//== NAMESPACES ===============================================================

namespace ACG {
namespace SceneGraph {


//== IMPLEMENTATION ==========================================================

template<class VolumeMeshT>
void VolumeMeshNodeT<VolumeMeshT>::pickCompat(GLState& _state, PickTarget _target) {

    // save state
    bool clientStateEnabledVertexArray   = GLState::isClientStateEnabled(GL_VERTEX_ARRAY);
    bool clientStateEnabledColorArray    = GLState::isClientStateEnabled(GL_COLOR_ARRAY);
    bool clientStateEnabledNormalArray   = GLState::isClientStateEnabled(GL_NORMAL_ARRAY);
    bool clientStateEnabledTexCoordArray = GLState::isClientStateEnabled(GL_TEXTURE_COORD_ARRAY);

    GLState::depthRange(0.01, 1.0);
    if (lastCellDrawMode_)
    {
        //draw cells so the user cannot pick invisible stuff

        GLState::bindBuffer(GL_ARRAY_BUFFER, cellsBufferManager_.getBuffer());
        GLState::enableClientState(GL_VERTEX_ARRAY);
        GLState::vertexPointer(3, GL_FLOAT, cellsBufferManager_.getStride(), reinterpret_cast<GLvoid*>(0));

        GLState::disableClientState(GL_NORMAL_ARRAY);
        GLState::disableClientState(GL_COLOR_ARRAY);

        Vec4f bc = _state.specular_color();
        _state.set_color(Vec4f(0.0,0.0,0.0,0.0));

        glDrawArrays(GL_TRIANGLES, 0, cellsBufferManager_.getNumOfVertices());

        _state.set_color(bc);
        GLState::bindBuffer(GL_ARRAY_BUFFER, 0);
    }

    if (lastFaceDrawMode_)
    {
        //draw faces so the user cannot pick invisible stuff

        GLState::bindBuffer(GL_ARRAY_BUFFER, facesBufferManager_.getBuffer());
        GLState::enableClientState(GL_VERTEX_ARRAY);
        GLState::vertexPointer(3, GL_FLOAT, facesBufferManager_.getStride(), reinterpret_cast<GLvoid*>(0));

        GLState::disableClientState(GL_NORMAL_ARRAY);
        GLState::disableClientState(GL_COLOR_ARRAY);

        Vec4f bc = _state.specular_color();
        _state.set_color(Vec4f(0.0,0.0,0.0,0.0));

        glDrawArrays(GL_TRIANGLES, 0, facesBufferManager_.getNumOfVertices());

        _state.set_color(bc);
        GLState::bindBuffer(GL_ARRAY_BUFFER, 0);
    }

    GLenum oldDepthFunc = _state.depthFunc();

    GLState::depthRange(0.0, 1.0);

    _state.set_depthFunc(GL_LEQUAL);

    switch (_target) {
    case PICK_VERTEX: {
        if (lastPickTarget_ != PICK_VERTEX)
            vertexPickBufferManager_.invalidateColors();
        _state.pick_set_maximum(mesh_.n_vertices());
        pickVerticesCompat(_state);
        break;
    }

    case PICK_EDGE: {
        _state.pick_set_maximum(mesh_.n_edges());
        pickEdgesCompat(_state, 0);
        break;
    }

    case PICK_FACE: {
        _state.pick_set_maximum(mesh_.n_faces());
        pickFacesCompat(_state, 0);
        break;
    }

    case PICK_CELL: {
        _state.pick_set_maximum(mesh_.n_cells());
        pickCellsCompat(_state, 0);
        break;
    }

    case PICK_ANYTHING: {
        if (lastPickTarget_ != PICK_ANYTHING)
            vertexPickBufferManager_.invalidateColors();

        int nv = mesh_.n_vertices();
        int ne = mesh_.n_edges();
        int nf = mesh_.n_faces();
        int nc = mesh_.n_cells();

        _state.pick_set_maximum(nv + ne + nf + nc);
        pickVerticesCompat(_state);
        pickEdgesCompat(_state, nv);
        pickFacesCompat(_state, nv + ne);
        pickCellsCompat(_state, nv + ne + nf);
        break;
    }

    default:
        break;
    }

    _state.set_depthFunc(oldDepthFunc);

    lastPickTarget_ = _target;

    // restore state
    if (clientStateEnabledVertexArray)
        GLState::enableClientState(GL_VERTEX_ARRAY);
    else
        GLState::disableClientState(GL_VERTEX_ARRAY);

    if (clientStateEnabledColorArray)
        GLState::enableClientState(GL_COLOR_ARRAY);
    else
        GLState::disableClientState(GL_COLOR_ARRAY);

    if (clientStateEnabledNormalArray)
        GLState::enableClientState(GL_NORMAL_ARRAY);
    else
        GLState::disableClientState(GL_NORMAL_ARRAY);

    if (clientStateEnabledTexCoordArray)
        GLState::enableClientState(GL_TEXTURE_COORD_ARRAY);
    else
        GLState::disableClientState(GL_TEXTURE_COORD_ARRAY);

}

//----------------------------------------------------------------------------



template<class VolumeMeshT>
void VolumeMeshNodeT<VolumeMeshT>::pickVerticesCompat(GLState& _state) {

    if (lastDrawMode_ & drawModes_.vertexBasedDrawModes)
        vertexPickBufferManager_.enableVertexPrimitives();
    else if (lastDrawMode_ & drawModes_.cellBasedDrawModes)
        vertexPickBufferManager_.enableVertexOnCellPrimitives();
    else
        vertexPickBufferManager_.enableVertexPrimitives();

    vertexPickBufferManager_.disableNormals();
    vertexPickBufferManager_.enablePickColors();



    GLState::bindBuffer(GL_ARRAY_BUFFER, vertexPickBufferManager_.getPickBuffer(_state, 0));

    GLState::enableClientState(GL_VERTEX_ARRAY);
    GLState::vertexPointer(3, GL_FLOAT, vertexPickBufferManager_.getStride(), reinterpret_cast<GLvoid*>(0));

    GLState::enableClientState(GL_COLOR_ARRAY);
    GLState::colorPointer(4, GL_UNSIGNED_BYTE, vertexPickBufferManager_.getStride(), reinterpret_cast<GLvoid*>(vertexPickBufferManager_.getColorOffset()));

    GLState::shadeModel(GL_SMOOTH);
    GLState::disable(GL_LIGHTING);

    float oldPointSize = _state.point_size();
    _state.set_point_size(1.5*_state.point_size());

    glDrawArrays(GL_POINTS, 0, vertexPickBufferManager_.getNumOfVertices());

    _state.set_point_size(oldPointSize);

    GLState::disableClientState(GL_COLOR_ARRAY);
    GLState::bindBuffer(GL_ARRAY_BUFFER, 0);

}

//----------------------------------------------------------------------------


template<class VolumeMeshT>
void VolumeMeshNodeT<VolumeMeshT>::pickEdgesCompat(GLState& _state, unsigned int _offset) {

    if ((lastDrawMode_ & (drawModes_.cellBasedDrawModes | drawModes_.edgesOnCells)) && !(lastDrawMode_ & (drawModes_.edgeBasedDrawModes & ~drawModes_.edgesOnCells)))
        edgePickBufferManager_.enableEdgeOnCellPrimitives();
    else
        edgePickBufferManager_.enableEdgePrimitives();

    edgePickBufferManager_.enablePickColors();
    edgePickBufferManager_.disableNormals();

    GLState::bindBuffer(GL_ARRAY_BUFFER, edgePickBufferManager_.getPickBuffer(_state, _offset));

    GLState::enableClientState(GL_VERTEX_ARRAY);
    GLState::vertexPointer(3, GL_FLOAT, edgePickBufferManager_.getStride(), reinterpret_cast<GLvoid*>(0));

    GLState::enableClientState(GL_COLOR_ARRAY);
    GLState::colorPointer(4, GL_UNSIGNED_BYTE, edgePickBufferManager_.getStride(), reinterpret_cast<GLvoid*>(edgePickBufferManager_.getColorOffset()));

    GLState::shadeModel(GL_SMOOTH);
    GLState::disable(GL_LIGHTING);

    float oldLineWidth = _state.line_width();
    _state.set_line_width(4.0*_state.line_width());

    glDrawArrays(GL_LINES, 0, edgePickBufferManager_.getNumOfVertices());

    _state.set_line_width(oldLineWidth);

    GLState::disableClientState(GL_COLOR_ARRAY);
    GLState::bindBuffer(GL_ARRAY_BUFFER, 0);

}

//----------------------------------------------------------------------------


template<class VolumeMeshT>
void VolumeMeshNodeT<VolumeMeshT>::pickFacesCompat(GLState& _state, unsigned int _offset) {

    if (lastDrawMode_ & (drawModes_.faceBasedDrawModes | drawModes_.halffaceBasedDrawModes))
        facePickBufferManager_.enableFacePrimitives();
    else if (lastDrawMode_ & drawModes_.cellBasedDrawModes)
        facePickBufferManager_.enableFaceOnCellPrimitives();
    else
        facePickBufferManager_.enableFacePrimitives();

    facePickBufferManager_.disableNormals();
    facePickBufferManager_.enablePickColors();

    GLState::bindBuffer(GL_ARRAY_BUFFER, facePickBufferManager_.getPickBuffer(_state, _offset));

    GLState::enableClientState(GL_VERTEX_ARRAY);
    GLState::vertexPointer(3, GL_FLOAT, facePickBufferManager_.getStride(), reinterpret_cast<GLvoid*>(0));

    GLState::enableClientState(GL_COLOR_ARRAY);
    GLState::colorPointer(4, GL_UNSIGNED_BYTE, facePickBufferManager_.getStride(), reinterpret_cast<GLvoid*>(facePickBufferManager_.getColorOffset()));

    GLState::shadeModel(GL_SMOOTH);
    GLState::disable(GL_LIGHTING);

    glDrawArrays(GL_TRIANGLES, 0, facePickBufferManager_.getNumOfVertices());

    GLState::disableClientState(GL_COLOR_ARRAY);
    GLState::bindBuffer(GL_ARRAY_BUFFER, 0);
}

//----------------------------------------------------------------------------


template<class VolumeMeshT>
void VolumeMeshNodeT<VolumeMeshT>::pickCellsCompat(GLState& _state, unsigned int _offset) {

    cellPickBufferManager_.enablePickColors();
    cellPickBufferManager_.disableNormals();
    cellPickBufferManager_.enableCellPrimitives();

    GLState::bindBuffer(GL_ARRAY_BUFFER, cellPickBufferManager_.getPickBuffer(_state, _offset));

    GLState::enableClientState(GL_VERTEX_ARRAY);
    GLState::vertexPointer(3, GL_FLOAT, cellPickBufferManager_.getStride(), reinterpret_cast<GLvoid*>(0));

    GLState::enableClientState(GL_COLOR_ARRAY);
    GLState::colorPointer(4, GL_UNSIGNED_BYTE, cellPickBufferManager_.getStride(), reinterpret_cast<GLvoid*>(cellPickBufferManager_.getColorOffset()));

    GLState::shadeModel(GL_SMOOTH);
    GLState::disable(GL_LIGHTING);

    glDrawArrays(GL_TRIANGLES, 0, cellPickBufferManager_.getNumOfVertices());

    GLState::disableClientState(GL_COLOR_ARRAY);
    GLState::bindBuffer(GL_ARRAY_BUFFER, 0);
}
//=============================================================================
} // namespace SceneGraph
} // namespace ACG
//=============================================================================