viewer_drawer.h

/*****************************************************************************
 * VCLib                                                                     *
 * Visual Computing Library                                                  *
 *                                                                           *
 * Copyright(C) 2021-2025                                                    *
 * Visual Computing Lab                                                      *
 * ISTI - Italian National Research Council                                  *
 *                                                                           *
 * All rights reserved.                                                      *
 *                                                                           *
 * This program is free software; you can redistribute it and/or modify      *
 * it under the terms of the Mozilla Public License Version 2.0 as published *
 * by the Mozilla Foundation; either version 2 of the License, or            *
 * (at your option) any later version.                                       *
 *                                                                           *
 * This program 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              *
 * Mozilla Public License Version 2.0                                        *
 * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
 ****************************************************************************/
 
#ifndef VCL_OPENGL2_DRAWERS_VIEWER_DRAWER_H
#define VCL_OPENGL2_DRAWERS_VIEWER_DRAWER_H
 
#include <vclib/render/drawers/abstract_viewer_drawer.h>
#include <vclib/render/read_buffer_types.h>
 
#include <memory>
 
#ifdef __APPLE__
#include <OpenGL/gl.h>
#else
#ifdef _WIN32
#include <windows.h>
#endif
#include <GL/gl.h>
#endif
 
namespace vcl {
 
template<typename DerivedRenderApp>
class ViewerDrawerOpenGL2 : public AbstractViewerDrawer<DerivedRenderApp>
{
    using ParentViewer = AbstractViewerDrawer<DerivedRenderApp>;
    using DTB          = ParentViewer::DTB;
 
public:
    ViewerDrawerOpenGL2(uint width = 1024, uint height = 768) :
            ParentViewer(width, height)
    {
    }
 
    ViewerDrawerOpenGL2(
        const std::shared_ptr<DrawableObjectVector>& v,
        uint                                         width = 1024,
        uint height = 768) : ViewerDrawerOpenGL2(width, height)
    {
        ParentViewer::setDrawableObjectVector(v);
    }
 
    void onInit(uint viewId) override
    {
        ParentViewer::onInit(viewId);
        glEnable(GL_LIGHTING);
        glEnable(GL_LIGHT0);
        glEnable(GL_DEPTH_TEST);
        glEnable(GL_COLOR_MATERIAL);
        glEnable(GL_NORMALIZE);
 
        float lightAmbient[] = {.2f, .2f, .2f, 1.0f};
        float lightDiffuse[] = {.5f, .5f, .5f, 1.0f};
 
        glLightfv(GL_LIGHT0, GL_AMBIENT, lightAmbient);
        glLightfv(GL_LIGHT0, GL_DIFFUSE, lightDiffuse);
 
        if (ParentViewer::mDrawList) {
            for (auto& obj : *(ParentViewer::mDrawList)) {
                obj->init();
            }
        }
    }
 
    void onDraw(uint viewId) override { onDrawContent(viewId); }
 
    void onDrawContent(uint) override
    {
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
        auto         tmp = DTB::light().direction();
        vcl::Point4f lPos(tmp.x(), tmp.y(), tmp.z(), 0.0f);
 
        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        glMultMatrixf(DTB::projectionMatrix().data());
        glMatrixMode(GL_MODELVIEW);
        glLoadIdentity();
        glLightfv(GL_LIGHT0, GL_POSITION, lPos.data());
        glMultMatrixf(DTB::viewMatrix().data());
 
        for (auto& obj : *(ParentViewer::mDrawList))
            obj->draw();
    }
 
    // events
    void onResize(unsigned int width, unsigned int height) override
    {
        DTB::resizeViewer(width, height);
    }
 
    void onMouseDoubleClick(
        MouseButton::Enum   button,
        double              x,
        double              y,
        const KeyModifiers& modifiers) override
    {
        ParentViewer::readRequest(button, x, y, modifiers);
    }
 
    void toggleAxisVisibility() override
    {
        // todo
    }
 
    void toggleTrackBallVisibility() override
    {
        // todo
    }
};
 
} // namespace vcl
 
#endif // VCL_OPENGL2_DRAWERS_VIEWER_DRAWER_H