File indexing completed on 2024-05-19 05:31:54

 /*
     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 "glrendertimequery.h"
 #include "opengl/glplatform.h"
 
 namespace KWin
 {
 
 GLRenderTimeQuery::GLRenderTimeQuery()
 {
     if (GLPlatform::instance()->supports(GLFeature::TimerQuery)) {
         glGenQueries(1, &m_query);
     }
 }
 
 GLRenderTimeQuery::~GLRenderTimeQuery()
 {
     if (m_query) {
         glDeleteQueries(1, &m_query);
     }
 }
 
 void GLRenderTimeQuery::begin()
 {
     if (m_query) {
         GLint64 nanos = 0;
         glGetInteger64v(GL_TIMESTAMP, &nanos);
         m_cpuStart = std::chrono::nanoseconds(nanos);
     } else {
         m_cpuStart = std::chrono::steady_clock::now().time_since_epoch();
     }
 }
 
 void GLRenderTimeQuery::end()
 {
     if (m_query) {
         glQueryCounter(m_query, GL_TIMESTAMP);
     } else {
         m_cpuEnd = std::chrono::steady_clock::now().time_since_epoch();
     }
     m_hasResult = true;
 }
 
 std::chrono::nanoseconds GLRenderTimeQuery::result()
 {
     if (!m_hasResult) {
         return std::chrono::nanoseconds::zero();
     }
     m_hasResult = false;
     if (m_query) {
         uint64_t nanos = 0;
         glGetQueryObjectui64v(m_query, GL_QUERY_RESULT, &nanos);
         if (nanos == 0) {
             return std::chrono::nanoseconds::zero();
         }
         return std::chrono::nanoseconds(nanos) - m_cpuStart;
     } else {
         return m_cpuEnd - m_cpuStart;
     }
 }
 
 }