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142 lines
4.7 KiB
C++
142 lines
4.7 KiB
C++
//
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// TV3DManager.cpp
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// interface/src/devices
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//
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// Created by Brad Hefta-Gaub on 12/24/13.
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// Copyright 2013 High Fidelity, Inc.
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//
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// Distributed under the Apache License, Version 2.0.
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// See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
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//
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#include "InterfaceConfig.h"
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#include <QOpenGLFramebufferObject>
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#include <glm/glm.hpp>
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#ifdef WIN32
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#include <Systime.h>
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#endif
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#include "Application.h"
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#include "TV3DManager.h"
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#include "Menu.h"
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int TV3DManager::_screenWidth = 1;
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int TV3DManager::_screenHeight = 1;
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double TV3DManager::_aspect = 1.0;
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eyeFrustum TV3DManager::_leftEye;
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eyeFrustum TV3DManager::_rightEye;
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bool TV3DManager::isConnected() {
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return Menu::getInstance()->isOptionChecked(MenuOption::Enable3DTVMode);
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}
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void TV3DManager::connect() {
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Application* app = Application::getInstance();
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int width = app->getGLWidget()->width();
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int height = app->getGLWidget()->height();
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Camera& camera = *app->getCamera();
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configureCamera(camera, width, height);
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}
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// The basic strategy of this stereoscopic rendering is explained here:
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// http://www.orthostereo.com/geometryopengl.html
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void TV3DManager::setFrustum(Camera& whichCamera) {
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const double DTR = 0.0174532925; // degree to radians
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const double IOD = 0.05; //intraocular distance
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double fovy = whichCamera.getFieldOfView(); // field of view in y-axis
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double nearZ = whichCamera.getNearClip(); // near clipping plane
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double screenZ = Application::getInstance()->getViewFrustum()->getFocalLength(); // screen projection plane
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double top = nearZ * tan(DTR * fovy / 2.0); //sets top of frustum based on fovy and near clipping plane
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double right = _aspect * top; // sets right of frustum based on aspect ratio
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double frustumshift = (IOD / 2) * nearZ / screenZ;
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_leftEye.top = top;
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_leftEye.bottom = -top;
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_leftEye.left = -right + frustumshift;
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_leftEye.right = right + frustumshift;
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_leftEye.modelTranslation = IOD / 2;
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_rightEye.top = top;
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_rightEye.bottom = -top;
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_rightEye.left = -right - frustumshift;
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_rightEye.right = right - frustumshift;
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_rightEye.modelTranslation = -IOD / 2;
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}
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void TV3DManager::configureCamera(Camera& whichCamera, int screenWidth, int screenHeight) {
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if (screenHeight == 0) {
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screenHeight = 1; // prevent divide by 0
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}
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_screenWidth = screenWidth;
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_screenHeight = screenHeight;
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_aspect= (double)_screenWidth / (double)_screenHeight;
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setFrustum(whichCamera);
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glViewport (0, 0, _screenWidth, _screenHeight); // sets drawing viewport
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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}
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void TV3DManager::display(Camera& whichCamera) {
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double nearZ = whichCamera.getNearClip(); // near clipping plane
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double farZ = whichCamera.getFarClip(); // far clipping plane
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// left eye portal
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int portalX = 0;
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int portalY = 0;
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int portalW = Application::getInstance()->getGLWidget()->width() / 2;
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int portalH = Application::getInstance()->getGLWidget()->height();
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glEnable(GL_SCISSOR_TEST);
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// render left side view
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glViewport(portalX, portalY, portalW, portalH);
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glScissor(portalX, portalY, portalW, portalH);
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glPushMatrix();
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{
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity(); // reset projection matrix
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glFrustum(_leftEye.left, _leftEye.right, _leftEye.bottom, _leftEye.top, nearZ, farZ); // set left view frustum
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glTranslatef(_leftEye.modelTranslation, 0.0, 0.0); // translate to cancel parallax
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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Application::getInstance()->displaySide(whichCamera);
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}
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glPopMatrix();
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glDisable(GL_SCISSOR_TEST);
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// render right side view
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portalX = Application::getInstance()->getGLWidget()->width() / 2;
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glEnable(GL_SCISSOR_TEST);
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// render left side view
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glViewport(portalX, portalY, portalW, portalH);
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glScissor(portalX, portalY, portalW, portalH);
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glPushMatrix();
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{
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity(); // reset projection matrix
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glFrustum(_rightEye.left, _rightEye.right, _rightEye.bottom, _rightEye.top, nearZ, farZ); // set left view frustum
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glTranslatef(_rightEye.modelTranslation, 0.0, 0.0); // translate to cancel parallax
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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Application::getInstance()->displaySide(whichCamera);
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}
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glPopMatrix();
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glDisable(GL_SCISSOR_TEST);
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// reset the viewport to how we started
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glViewport(0, 0, Application::getInstance()->getGLWidget()->width(), Application::getInstance()->getGLWidget()->height());
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}
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