File indexing completed on 2024-05-19 05:31:56

 /*
     KWin - the KDE window manager
     This file is part of the KDE project.
 
     SPDX-FileCopyrightText: 2023 Xaver Hugl <xaver.hugl@gmail.com>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 #include "openglcontext.h"
 
 #include <QByteArray>
 #include <QList>
 
 #include <epoxy/gl.h>
 
 namespace KWin
 {
 
 static QSet<QByteArray> getExtensions(OpenGlContext *context)
 {
     QSet<QByteArray> ret;
     if (!context->isOpenglES() && context->hasVersion(Version(3, 0))) {
         int count;
         glGetIntegerv(GL_NUM_EXTENSIONS, &count);
 
         for (int i = 0; i < count; i++) {
             const char *name = (const char *)glGetStringi(GL_EXTENSIONS, i);
             ret.insert(name);
         }
     } else {
         const QByteArray extensions = (const char *)glGetString(GL_EXTENSIONS);
         QList<QByteArray> extensionsList = extensions.split(' ');
         ret = {extensionsList.constBegin(), extensionsList.constEnd()};
     }
     return ret;
 }
 
 OpenGlContext::OpenGlContext()
     : m_versionString((const char *)glGetString(GL_VERSION))
     , m_version(Version::parseString(m_versionString))
     , m_vendor((const char *)glGetString(GL_VENDOR))
     , m_renderer((const char *)glGetString(GL_RENDERER))
     , m_isOpenglES(m_versionString.startsWith("OpenGL ES"))
     , m_extensions(getExtensions(this))
     , m_supportsTimerQueries(checkTimerQuerySupport())
 {
 }
 
 bool OpenGlContext::checkTimerQuerySupport() const
 {
     if (qEnvironmentVariableIsSet("KWIN_NO_TIMER_QUERY")) {
         return false;
     }
     if (m_isOpenglES) {
         // 3.0 is required so query functions can be used without "EXT" suffix.
         // Timer queries are still not part of the core OpenGL ES specification.
         return openglVersion() >= Version(3, 0) && hasOpenglExtension("GL_EXT_disjoint_timer_query");
     } else {
         return openglVersion() >= Version(3, 3) || hasOpenglExtension("GL_ARB_timer_query");
     }
 }
 
 bool OpenGlContext::hasVersion(const Version &version) const
 {
     return m_version >= version;
 }
 
 QByteArrayView OpenGlContext::openglVersionString() const
 {
     return m_versionString;
 }
 
 Version OpenGlContext::openglVersion() const
 {
     return m_version;
 }
 
 QByteArrayView OpenGlContext::vendor() const
 {
     return m_vendor;
 }
 
 QByteArrayView OpenGlContext::renderer() const
 {
     return m_renderer;
 }
 
 bool OpenGlContext::isOpenglES() const
 {
     return m_isOpenglES;
 }
 
 bool OpenGlContext::hasOpenglExtension(QByteArrayView name) const
 {
     return std::any_of(m_extensions.cbegin(), m_extensions.cend(), [name](const auto &string) {
         return string == name;
     });
 }
 
 bool OpenGlContext::isSoftwareRenderer() const
 {
     return m_renderer.contains("softpipe") || m_renderer.contains("Software Rasterizer") || m_renderer.contains("llvmpipe");
 }
 
 bool OpenGlContext::supportsTimerQueries() const
 {
     return m_supportsTimerQueries;
 }
 
 bool OpenGlContext::checkSupported() const
 {
     const bool supportsGLSL = m_isOpenglES || (hasOpenglExtension("GL_ARB_shader_objects") && hasOpenglExtension("GL_ARB_fragment_shader") && hasOpenglExtension("GL_ARB_vertex_shader"));
     const bool supportsNonPowerOfTwoTextures = m_isOpenglES || hasOpenglExtension("GL_ARB_texture_non_power_of_two");
     const bool supports3DTextures = !m_isOpenglES || hasVersion(Version(3, 0)) || hasOpenglExtension("GL_OES_texture_3D");
     return supportsGLSL && supportsNonPowerOfTwoTextures && supports3DTextures;
 }
 }