////  GLBackend.cpp//  libraries/gpu/src/gpu////  Created by Sam Gateau on 10/27/2014.//  Copyright 2014 High Fidelity, Inc.//  Copyright 2026 Overte e.V.////  Distributed under the Apache License, Version 2.0.//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html//#include <gpu/gl/GLBackend.h> #include <functional> #include <QtCore/QProcessEnvironment> #include <shared/GlobalAppProperties.h>#include <gl/QOpenGLContextWrapper.h>#include <gl/GLHelpers.h>#include <gpu/gl/GLShader.h> #include "../gl41/GL41Backend.h"#include "../gl45/GL45Backend.h"#include "../gles/GLESBackend.h" using namespace gpu;using namespace gpu::gl; static GLBackend* INSTANCE{ nullptr }; BackendPointer GLBackend::createBackend() {    auto backendApi = hifi::properties::getGraphicsAPI();    auto version = QOpenGLContextWrapper::currentContextVersion();    std::shared_ptr<GLBackend> result;    if (backendApi == hifi::properties::GraphicsAPI::GL45 && version >= 0x0405) {        qCDebug(gpugllogging) << "Using OpenGL 4.5 backend";        result = std::make_shared<gpu::gl45::GL45Backend>();    } else if (backendApi == hifi::properties::GraphicsAPI::GL41) {        qCDebug(gpugllogging) << "Using OpenGL 4.1 backend";        result = std::make_shared<gpu::gl41::GL41Backend>();    } else if (backendApi == hifi::properties::GraphicsAPI::GLES32) {        qDebug() << "Using OpenGLES 3.2 backend";        result = std::make_shared<gpu::gles::GLESBackend>();    } else {        qDebug() << "Unknown OpenGL backend" << (int)backendApi;        return nullptr;    }     result->initInput();    result->initTransform();    result->initTextureManagementStage();     INSTANCE = result.get();    void* voidInstance = &(*result);    qApp->setProperty(hifi::properties::gl::BACKEND, QVariant::fromValue(voidInstance));    return result;} GLBackend& getBackend() {    if (!INSTANCE) {        INSTANCE = static_cast<GLBackend*>(qApp->property(hifi::properties::gl::BACKEND).value<void*>());    }    return *INSTANCE;}