////  TextureCache.cpp//  interface////  Created by Andrzej Kapolka on 8/6/13.//  Copyright (c) 2013 High Fidelity, Inc. All rights reserved. // include this before QGLWidget, which includes an earlier version of OpenGL#include "InterfaceConfig.h" #include <QGLWidget>#include <QOpenGLFramebufferObject> #include <glm/gtc/random.hpp> #include "Application.h"#include "TextureCache.h" TextureCache::TextureCache() : _permutationNormalTextureID(0),    _primaryFramebufferObject(NULL), _secondaryFramebufferObject(NULL), _tertiaryFramebufferObject(NULL) {} TextureCache::~TextureCache() {    if (_permutationNormalTextureID != 0) {        glDeleteTextures(1, &_permutationNormalTextureID);    }    if (_primaryFramebufferObject != NULL) {        delete _primaryFramebufferObject;        glDeleteTextures(1, &_primaryDepthTextureID);    }    if (_secondaryFramebufferObject != NULL) {        delete _secondaryFramebufferObject;    }    if (_tertiaryFramebufferObject != NULL) {        delete _tertiaryFramebufferObject;    }} GLuint TextureCache::getPermutationNormalTextureID() {    if (_permutationNormalTextureID == 0) {        glGenTextures(1, &_permutationNormalTextureID);        glBindTexture(GL_TEXTURE_2D, _permutationNormalTextureID);                // the first line consists of random permutation offsets        unsigned char data[256 * 2 * 3];        for (int i = 0; i < 256 * 3; i++) {            data[i] = rand() % 256;        }        // the next, random unit normals        for (int i = 256 * 3; i < 256 * 3 * 2; i += 3) {            glm::vec3 randvec = glm::sphericalRand(1.0f);            data[i] = ((randvec.x + 1.0f) / 2.0f) * 255.0f;            data[i + 1] = ((randvec.y + 1.0f) / 2.0f) * 255.0f;            data[i + 2] = ((randvec.z + 1.0f) / 2.0f) * 255.0f;        }        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 256, 2, 0, GL_RGB, GL_UNSIGNED_BYTE, data);        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);                glBindTexture(GL_TEXTURE_2D, 0);    }    return _permutationNormalTextureID;} QOpenGLFramebufferObject* TextureCache::getPrimaryFramebufferObject() {    if (_primaryFramebufferObject == NULL) {        QSize size = Application::getInstance()->getGLWidget()->size();        _primaryFramebufferObject = new QOpenGLFramebufferObject(size);        Application::getInstance()->getGLWidget()->installEventFilter(this);            glGenTextures(1, &_primaryDepthTextureID);        glBindTexture(GL_TEXTURE_2D, _primaryDepthTextureID);        glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, size.width(), size.height(),            0, GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, 0);        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);        glBindTexture(GL_TEXTURE_2D, 0);                _primaryFramebufferObject->bind();        glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, _primaryDepthTextureID, 0);        _primaryFramebufferObject->release();    }    return _primaryFramebufferObject;} GLuint TextureCache::getPrimaryDepthTextureID() {    // ensure that the primary framebuffer object is initialized before returning the depth texture id    getPrimaryFramebufferObject();    return _primaryDepthTextureID;} QOpenGLFramebufferObject* TextureCache::getSecondaryFramebufferObject() {    if (_secondaryFramebufferObject == NULL) {        _secondaryFramebufferObject = new QOpenGLFramebufferObject(Application::getInstance()->getGLWidget()->size());        Application::getInstance()->getGLWidget()->installEventFilter(this);    }    return _secondaryFramebufferObject;} QOpenGLFramebufferObject* TextureCache::getTertiaryFramebufferObject() {    if (_tertiaryFramebufferObject == NULL) {        _tertiaryFramebufferObject = new QOpenGLFramebufferObject(Application::getInstance()->getGLWidget()->size());        Application::getInstance()->getGLWidget()->installEventFilter(this);    }    return _tertiaryFramebufferObject;} bool TextureCache::eventFilter(QObject* watched, QEvent* event) {    if (event->type() == QEvent::Resize) {        QSize size = static_cast<QResizeEvent*>(event)->size();        if (_primaryFramebufferObject != NULL && _primaryFramebufferObject->size() != size) {            delete _primaryFramebufferObject;            _primaryFramebufferObject = NULL;            glDeleteTextures(1, &_primaryDepthTextureID);        }        if (_secondaryFramebufferObject != NULL && _secondaryFramebufferObject->size() != size) {            delete _secondaryFramebufferObject;            _secondaryFramebufferObject = NULL;        }        if (_tertiaryFramebufferObject != NULL && _tertiaryFramebufferObject->size() != size) {            delete _tertiaryFramebufferObject;            _tertiaryFramebufferObject = NULL;        }    }    return false;}