459 lines
13 KiB
C++
459 lines
13 KiB
C++
//=============================================================================
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// Copyright (C) 2011-2017 The pmp-library developers
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice, this
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// list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name of the copyright holder nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//=============================================================================
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#include "TrackballViewer.h"
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#include <algorithm>
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//=============================================================================
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namespace pmp {
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//=============================================================================
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TrackballViewer::TrackballViewer(const char* title, int width, int height,
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bool showgui)
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: Window(title, width, height, showgui)
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{
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// init mouse buttons
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for (bool& i : m_buttonDown)
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i = false;
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m_wheelPos = 0;
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// define basic draw modes
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addDrawMode("Wireframe");
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addDrawMode("Solid Flat");
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addDrawMode("Solid Smooth");
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setDrawMode("Solid Smooth");
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// init OpenGL state
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init();
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}
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//-----------------------------------------------------------------------------
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TrackballViewer::~TrackballViewer() = default;
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//-----------------------------------------------------------------------------
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void TrackballViewer::clearDrawModes()
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{
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m_nDrawModes = 0;
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m_drawModeNames.clear();
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}
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//-----------------------------------------------------------------------------
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unsigned int TrackballViewer::addDrawMode(const std::string& _s)
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{
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++m_nDrawModes;
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m_drawModeNames.push_back(_s);
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return m_nDrawModes - 1;
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}
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//-----------------------------------------------------------------------------
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void TrackballViewer::setDrawMode(const std::string& _s)
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{
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for (unsigned int i = 0; i < m_drawModeNames.size(); ++i)
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{
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if (m_drawModeNames[i] == _s)
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{
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m_drawMode = i;
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break;
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}
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}
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}
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//-----------------------------------------------------------------------------
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void TrackballViewer::keyboard(int key, int /*code*/, int action, int /*mods*/)
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{
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if (action != GLFW_PRESS && action != GLFW_REPEAT)
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return;
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switch (key)
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{
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#ifndef __EMSCRIPTEN__
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case GLFW_KEY_ESCAPE:
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case GLFW_KEY_Q:
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{
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exit(0);
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break;
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}
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#endif
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case GLFW_KEY_G:
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{
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showImGUI(!showImGUI());
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break;
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}
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case GLFW_KEY_SPACE:
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{
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if (++m_drawMode >= m_nDrawModes)
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m_drawMode = 0;
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std::string mode = m_drawModeNames[m_drawMode];
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std::cout << "setting draw mode to " << mode << std::endl;
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setDrawMode(mode);
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break;
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}
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case GLFW_KEY_LEFT:
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{
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rotate(vec3(0,1,0), -5.0);
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break;
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}
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case GLFW_KEY_RIGHT:
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{
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rotate(vec3(0,1,0), 5.0);
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break;
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}
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case GLFW_KEY_UP:
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{
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rotate(vec3(1,0,0), -5.0);
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break;
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}
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case GLFW_KEY_DOWN:
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{
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rotate(vec3(1,0,0), 5.0);
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break;
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}
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}
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}
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//-----------------------------------------------------------------------------
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void TrackballViewer::resize(int width, int height)
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{
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m_width = width;
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m_height = height;
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glViewport(0, 0, width, height);
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}
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//-----------------------------------------------------------------------------
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void TrackballViewer::display()
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{
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// clear buffers
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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// adjust clipping planes to tightly fit bounding sphere
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vec4 mc(m_center, 1.0);
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vec4 ec = m_modelviewMatrix * mc;
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float z = -ec[2];
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m_near = 0.01 * m_radius;
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m_far = 10.0 * m_radius;
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m_fovy = 45.0;
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m_near = std::max(0.001f * m_radius, z - m_radius);
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m_far = std::max(0.002f * m_radius, z + 2*m_radius);
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// update projection matrix
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m_projectionMatrix = perspectiveMatrix(
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m_fovy, (float)m_width / (float)m_height, m_near, m_far);
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// draw the scene in current draw mode
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if (m_drawMode < m_drawModeNames.size())
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draw(m_drawModeNames[m_drawMode]);
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else
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draw("");
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}
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//-----------------------------------------------------------------------------
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void TrackballViewer::mouse(int button, int action, int mods)
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{
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// record current modifier keys
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m_modifiers = mods;
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// mouse press
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if (action == GLFW_PRESS)
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{
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double x, y;
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cursorPos(x,y);
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m_lastPoint2D = ivec2(x, y);
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m_lastPointOk = mapToSphere(m_lastPoint2D, m_lastPoint3D);
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m_buttonDown[button] = true;
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// set rotation center
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if (m_modifiers == GLFW_MOD_CONTROL)
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{
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double x, y;
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cursorPos(x, y);
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flyTo(x, y);
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}
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}
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// mouse release
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else
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{
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m_lastPointOk = false;
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m_buttonDown[button] = false;
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}
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}
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//-----------------------------------------------------------------------------
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void TrackballViewer::scroll(double /*xoffset*/, double yoffset)
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{
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m_wheelPos += yoffset;
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float d = -(float)yoffset * 0.12 * m_radius;
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#ifdef __EMSCRIPTEN__
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d *= 0.5; // scrolling in browser is faster
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#endif
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translate(vec3(0.0, 0.0, d));
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}
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//-----------------------------------------------------------------------------
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void TrackballViewer::motion(double xpos, double ypos)
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{
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// zoom
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if ((m_buttonDown[GLFW_MOUSE_BUTTON_MIDDLE]) ||
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(m_buttonDown[GLFW_MOUSE_BUTTON_LEFT] &&
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(m_modifiers == GLFW_MOD_SHIFT)))
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{
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zoom(xpos, ypos);
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}
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// translation
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else if (m_buttonDown[GLFW_MOUSE_BUTTON_RIGHT] ||
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(m_buttonDown[GLFW_MOUSE_BUTTON_LEFT] &&
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(m_modifiers == GLFW_MOD_ALT)))
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{
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translation(xpos, ypos);
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}
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// rotation
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else if (m_buttonDown[GLFW_MOUSE_BUTTON_LEFT])
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{
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rotation(xpos, ypos);
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}
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// remember points
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m_lastPoint2D = ivec2(xpos, ypos);
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m_lastPointOk = mapToSphere(m_lastPoint2D, m_lastPoint3D);
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}
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//-----------------------------------------------------------------------------
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void TrackballViewer::init()
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{
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// set initial state
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glClearColor(1.0, 1.0, 1.0, 1.0);
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glEnable(GL_DEPTH_TEST);
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// init modelview
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m_modelviewMatrix = mat4::identity();
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// turn on multi-sampling to anti-alias lines
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#ifndef __EMSCRIPTEN__
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glEnable(GL_MULTISAMPLE);
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GLint n_samples;
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glGetIntegerv(GL_SAMPLES, &n_samples);
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std::cout << "Multi-sampling uses " << n_samples << " per pixel\n";
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#endif
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}
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//-----------------------------------------------------------------------------
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void TrackballViewer::setScene(const vec3& center, float radius)
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{
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m_center = center;
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m_radius = radius;
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viewAll();
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}
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//-----------------------------------------------------------------------------
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void TrackballViewer::viewAll()
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{
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vec4 c = vec4(m_center, 1.0);
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vec4 t = m_modelviewMatrix * c;
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translate(vec3(-t[0], -t[1], -t[2] - 2.5 * m_radius));
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}
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//-----------------------------------------------------------------------------
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bool TrackballViewer::pick(int x, int y, vec3& result)
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{
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#ifndef __EMSCRIPTEN__ // WebGL cannot read depth buffer
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// get viewport data
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GLint viewport[4];
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glGetIntegerv(GL_VIEWPORT, viewport);
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// take into accout highDPI scaling
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x *= m_scaling;
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y *= m_scaling;
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// in OpenGL y=0 is at the 'bottom'
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y = viewport[3] - y;
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// read depth buffer value at (x, y_new)
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float zf;
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glReadPixels(x, y, 1, 1, GL_DEPTH_COMPONENT, GL_FLOAT, &zf);
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if (zf != 1.0f)
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{
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float xf = ((float)x - (float) viewport[0]) / ((float) viewport[2]) * 2.0f - 1.0f;
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float yf = ((float)y - (float) viewport[1]) / ((float) viewport[3]) * 2.0f - 1.0f;
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zf = zf * 2.0f - 1.0f;
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mat4 mvp = m_projectionMatrix * m_modelviewMatrix;
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mat4 inv = inverse(mvp);
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vec4 p = inv * vec4(xf, yf, zf, 1.0f);
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p /= p[3];
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result = vec3(p[0], p[1], p[2]);
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return true;
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}
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#endif
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return false;
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}
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//-----------------------------------------------------------------------------
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void TrackballViewer::flyTo(int x, int y)
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{
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vec3 p;
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if (pick(x,y,p))
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{
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m_center = p;
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vec4 c = vec4(m_center, 1.0);
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vec4 t = m_modelviewMatrix * c;
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translate(vec3(-t[0], -t[1], -0.5*t[2]));
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}
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}
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//-----------------------------------------------------------------------------
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bool TrackballViewer::mapToSphere(const ivec2& point2D, vec3& result)
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{
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if ((point2D[0] >= 0) && (point2D[0] <= m_width) && (point2D[1] >= 0) &&
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(point2D[1] <= m_height))
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{
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double x = (double)(point2D[0] - 0.5 * m_width) / (double)m_width;
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double y = (double)(0.5 * m_height - point2D[1]) / (double)m_height;
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double sinx = sin(M_PI * x * 0.5);
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double siny = sin(M_PI * y * 0.5);
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double sinx2siny2 = sinx * sinx + siny * siny;
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result[0] = sinx;
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result[1] = siny;
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result[2] = sinx2siny2 < 1.0 ? sqrt(1.0 - sinx2siny2) : 0.0;
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return true;
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}
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else
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return false;
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}
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//-----------------------------------------------------------------------------
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void TrackballViewer::rotation(int x, int y)
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{
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if (m_lastPointOk)
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{
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ivec2 newPoint2D;
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vec3 newPoint3D;
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bool newPointok;
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newPoint2D = ivec2(x, y);
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newPointok = mapToSphere(newPoint2D, newPoint3D);
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if (newPointok)
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{
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vec3 axis = cross(m_lastPoint3D, newPoint3D);
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float cosAngle = dot(m_lastPoint3D, newPoint3D);
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if (fabs(cosAngle) < 1.0)
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{
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float angle = 2.0 * acos(cosAngle) * 180.0 / M_PI;
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rotate(axis, angle);
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}
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}
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}
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}
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//-----------------------------------------------------------------------------
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void TrackballViewer::translation(int x, int y)
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{
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float dx = x - m_lastPoint2D[0];
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float dy = y - m_lastPoint2D[1];
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vec4 mc = vec4(m_center, 1.0);
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vec4 ec = m_modelviewMatrix * mc;
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float z = -(ec[2] / ec[3]);
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float aspect = (float)m_width / (float)m_height;
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float up = tan(m_fovy / 2.0f * M_PI / 180.f) * m_near;
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float right = aspect * up;
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translate(vec3(2.0 * dx / m_width * right / m_near * z,
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-2.0 * dy / m_height * up / m_near * z, 0.0f));
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}
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//-----------------------------------------------------------------------------
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void TrackballViewer::zoom(int, int y)
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{
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float dy = y - m_lastPoint2D[1];
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float h = m_height;
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translate(vec3(0.0, 0.0, m_radius * dy * 3.0 / h));
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}
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//-----------------------------------------------------------------------------
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void TrackballViewer::translate(const vec3& t)
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{
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m_modelviewMatrix = translationMatrix(t) * m_modelviewMatrix;
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}
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//-----------------------------------------------------------------------------
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void TrackballViewer::rotate(const vec3& axis, float angle)
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{
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// center in eye coordinates
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vec4 mc = vec4(m_center, 1.0);
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vec4 ec = m_modelviewMatrix * mc;
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vec3 c(ec[0] / ec[3], ec[1] / ec[3], ec[2] / ec[3]);
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m_modelviewMatrix = translationMatrix(c) * rotationMatrix(axis, angle) *
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translationMatrix(-c) * m_modelviewMatrix;
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}
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//=============================================================================
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} // namespace pmp
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//=============================================================================
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