86 lines
3.2 KiB
C++
86 lines
3.2 KiB
C++
/********************************************************************************
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* ReactPhysics3D physics library, http://code.google.com/p/reactphysics3d/ *
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* Copyright (c) 2010-2013 Daniel Chappuis *
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*********************************************************************************
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* *
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* This software is provided 'as-is', without any express or implied warranty. *
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* In no event will the authors be held liable for any damages arising from the *
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* use of this software. *
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* *
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* Permission is granted to anyone to use this software for any purpose, *
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* including commercial applications, and to alter it and redistribute it *
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* freely, subject to the following restrictions: *
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* *
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* 1. The origin of this software must not be misrepresented; you must not claim *
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* that you wrote the original software. If you use this software in a *
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* product, an acknowledgment in the product documentation would be *
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* appreciated but is not required. *
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* *
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* 2. Altered source versions must be plainly marked as such, and must not be *
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* misrepresented as being the original software. *
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* *
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* 3. This notice may not be removed or altered from any source distribution. *
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* *
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********************************************************************************/
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// Libraries
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#include "Viewer.h"
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#include "openglframework.h"
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#include <sstream>
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// Constructor
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Viewer::Viewer() : openglframework::GlutViewer(), fps(0), nbFrames(0) {
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}
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// Compute the FPS
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void Viewer::computeFPS() {
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nbFrames++;
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// Get the number of milliseconds since glutInit called
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currentTime = glutGet(GLUT_ELAPSED_TIME);
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// Calculate time passed
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int timeInterval = currentTime - previousTime;
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// Update the FPS counter each second
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if(timeInterval > 1000){
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// calculate the number of frames per second
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fps = static_cast<int>(nbFrames / (timeInterval / 1000.0f));
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// Set time
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previousTime = currentTime;
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// Reset frame count
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nbFrames = 0;
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}
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}
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// Display the GUI
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void Viewer::displayGUI() {
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// Display the FPS
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displayFPS();
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}
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// Display the FPS
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void Viewer::displayFPS() {
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#ifdef USE_FREEGLUT
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glOrtho(0, mCamera.getWidth(), mCamera.getHeight(), 0, -1, 1);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glRasterPos2i(10, 20);
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glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
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std::stringstream ss;
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ss << "FPS : " << fps;
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glutBitmapString(GLUT_BITMAP_HELVETICA_12, (const unsigned char*)ss.str().c_str());
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#endif
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}
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