diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4a5b2a6d818..a80019b4877 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -625,7 +625,6 @@ option(WITH_CYCLES "Enable Cycles Render Engine" ON)
 option(WITH_CYCLES_OSL "Build Cycles with OpenShadingLanguage support" ON)
 option(WITH_CYCLES_PATH_GUIDING "Build Cycles with path guiding support" ON)
 option(WITH_CYCLES_EMBREE "Build Cycles with Embree support" ON)
-option(WITH_CYCLES_LOGGING "Build Cycles with logging support" ON)
 option(WITH_CYCLES_DEBUG "Build Cycles with options useful for debugging (e.g., MIS)" OFF)
 
 option(WITH_CYCLES_STANDALONE "Build Cycles standalone application" OFF)
@@ -655,7 +654,6 @@ Run additional Cycles test with OSL enabled"
   OFF
 )
 mark_as_advanced(WITH_CYCLES_KERNEL_ASAN)
-mark_as_advanced(WITH_CYCLES_LOGGING)
 mark_as_advanced(WITH_CYCLES_DEBUG_NAN)
 mark_as_advanced(WITH_CYCLES_NATIVE_ONLY)
 mark_as_advanced(WITH_CYCLES_PRECOMPUTE)
@@ -1711,7 +1709,7 @@ set_and_warn_incompatible(WITH_PYTHON_MODULE WITH_GTESTS OFF)
 # -----------------------------------------------------------------------------
 # Configure `GLog/GFlags`
 
-if(WITH_LIBMV OR WITH_GTESTS OR (WITH_CYCLES AND WITH_CYCLES_LOGGING))
+if(WITH_LIBMV OR WITH_GTESTS)
   if(WITH_SYSTEM_GFLAGS)
     find_package(Gflags)
     if(NOT GFLAGS_FOUND)
@@ -2686,12 +2684,6 @@ elseif(WITH_CYCLES_STANDALONE OR WITH_CYCLES_HYDRA_RENDER_DELEGATE)
   add_subdirectory(intern/sky)
 
   add_subdirectory(intern/cycles)
-  if(WITH_CYCLES_LOGGING)
-    if(NOT WITH_SYSTEM_GFLAGS)
-      add_subdirectory(extern/gflags)
-    endif()
-    add_subdirectory(extern/glog)
-  endif()
   if(WITH_CUDA_DYNLOAD)
     add_subdirectory(extern/cuew)
   endif()
diff --git a/extern/CMakeLists.txt b/extern/CMakeLists.txt
index fb5232cca05..d384cf64425 100644
--- a/extern/CMakeLists.txt
+++ b/extern/CMakeLists.txt
@@ -86,7 +86,7 @@ if(WITH_LIBMV)
   add_subdirectory(ceres)
 endif()
 
-if(WITH_LIBMV OR WITH_GTESTS OR (WITH_CYCLES AND WITH_CYCLES_LOGGING))
+if(WITH_LIBMV OR WITH_GTESTS)
   if(NOT WITH_SYSTEM_GFLAGS)
     add_subdirectory(gflags)
   endif()
diff --git a/intern/cycles/CMakeLists.txt b/intern/cycles/CMakeLists.txt
index 02aca6b299c..2772215b6eb 100644
--- a/intern/cycles/CMakeLists.txt
+++ b/intern/cycles/CMakeLists.txt
@@ -325,18 +325,6 @@ if(WITH_OPENIMAGEDENOISE)
   )
 endif()
 
-# Logging capabilities using GLog library.
-if(WITH_CYCLES_LOGGING)
-  add_definitions(-DWITH_CYCLES_LOGGING)
-  add_definitions(${GLOG_DEFINES})
-  add_definitions(-DCYCLES_GFLAGS_NAMESPACE=${GFLAGS_NAMESPACE})
-  include_directories(
-    SYSTEM
-    ${GLOG_INCLUDE_DIRS}
-    ${GFLAGS_INCLUDE_DIRS}
-  )
-endif()
-
 if(WITH_ALEMBIC)
   add_definitions(-DWITH_ALEMBIC)
   include_directories(
diff --git a/intern/cycles/app/cycles_standalone.cpp b/intern/cycles/app/cycles_standalone.cpp
index 2f042b00247..69518684103 100644
--- a/intern/cycles/app/cycles_standalone.cpp
+++ b/intern/cycles/app/cycles_standalone.cpp
@@ -405,9 +405,8 @@ static void options_parse(const int argc, const char **argv)
   ArgParse ap;
   bool help = false;
   bool profile = false;
-  bool debug = false;
   bool version = false;
-  int verbosity = 1;
+  string log_level;
 
   ap.usage("cycles [options] file.xml");
   ap.arg("filename").hidden().action([&](auto argv) { options.filepath = argv[0]; });
@@ -442,12 +441,9 @@ static void options_parse(const int argc, const char **argv)
   });
   ap.arg("--list-devices", &list).help("List information about all available devices");
   ap.arg("--profile", &profile).help("Enable profile logging");
-#ifdef WITH_CYCLES_LOGGING
-  ap.arg("--debug", &debug).help("Enable debug logging");
-  ap.arg("--verbose %d:VERBOSE").help("Set verbosity of the logger").action([&](auto argv) {
-    parse_int(argv, &verbosity);
-  });
-#endif
+  ap.arg("--log-level %s:LEVEL")
+      .help("Log verbosity: fatal, error, warning, info, stats, debug")
+      .action([&](auto argv) { parse_string(argv, &log_level); });
   ap.arg("--help", &help).help("Print help message");
   ap.arg("--version", &version).help("Print version number");
 
@@ -457,9 +453,8 @@ static void options_parse(const int argc, const char **argv)
     exit(EXIT_FAILURE);
   }
 
-  if (debug) {
-    util_logging_start();
-    util_logging_verbosity_set(verbosity);
+  if (!log_level.empty()) {
+    log_level_set(log_level);
   }
 
   if (list) {
@@ -544,7 +539,7 @@ using namespace ccl;
 
 int main(const int argc, const char **argv)
 {
-  util_logging_init(argv[0]);
+  log_init(argv[0]);
   path_init();
   options_parse(argc, argv);
 
diff --git a/intern/cycles/blender/CCL_api.h b/intern/cycles/blender/CCL_api.h
index 8d66d5a8018..a27755e68b9 100644
--- a/intern/cycles/blender/CCL_api.h
+++ b/intern/cycles/blender/CCL_api.h
@@ -12,9 +12,7 @@ extern "C" {
 
 void *CCL_python_module_init(void);
 
-void CCL_init_logging(const char *argv0);
-void CCL_start_debug_logging(void);
-void CCL_logging_verbosity_set(const int verbosity);
+void CCL_log_init(void);
 
 #ifdef __cplusplus
 }
diff --git a/intern/cycles/blender/CMakeLists.txt b/intern/cycles/blender/CMakeLists.txt
index 0110d203a9d..e343502043a 100644
--- a/intern/cycles/blender/CMakeLists.txt
+++ b/intern/cycles/blender/CMakeLists.txt
@@ -58,6 +58,7 @@ set(LIB
   PRIVATE bf::imbuf
   PRIVATE bf::gpu
   PRIVATE bf::intern::guardedalloc
+  PRIVATE bf::intern::clog
   PRIVATE bf::render
   cycles_bvh
   cycles_device
@@ -73,13 +74,6 @@ set(LIB
   ${PYTHON_LIBRARIES}
 )
 
-if(WITH_CYCLES_LOGGING)
-  list(APPEND LIB
-    ${GLOG_LIBRARIES}
-    ${GFLAGS_LIBRARIES}
-  )
-endif()
-
 set(ADDON_FILES
   addon/__init__.py
   addon/camera.py
diff --git a/intern/cycles/blender/logging.cpp b/intern/cycles/blender/logging.cpp
index bc6a7e106c8..ca92da52412 100644
--- a/intern/cycles/blender/logging.cpp
+++ b/intern/cycles/blender/logging.cpp
@@ -5,17 +5,59 @@
 #include "blender/CCL_api.h"
 #include "util/log.h"
 
-void CCL_init_logging(const char *argv0)
-{
-  ccl::util_logging_init(argv0);
-}
+#include "CLG_log.h"
 
-void CCL_start_debug_logging()
-{
-  ccl::util_logging_start();
-}
+static CLG_LogRef LOG = {"cycles"};
 
-void CCL_logging_verbosity_set(const int verbosity)
+void CCL_log_init()
 {
-  ccl::util_logging_verbosity_set(verbosity);
+  /* Set callback to pass log messages to CLOG. */
+  ccl::log_init(
+      [](const ccl::LogLevel level, const char *file_line, const char *func, const char *msg) {
+        const CLG_LogType *log_type = CLOG_ENSURE(&LOG);
+        switch (level) {
+          case ccl::FATAL:
+          case ccl::DFATAL:
+            CLG_log_str(log_type, CLG_SEVERITY_FATAL, file_line, func, msg);
+            return;
+          case ccl::ERROR:
+          case ccl::DERROR:
+            CLG_log_str(log_type, CLG_SEVERITY_ERROR, file_line, func, msg);
+            return;
+          case ccl::WARNING:
+          case ccl::DWARNING:
+            CLG_log_str(log_type, CLG_SEVERITY_WARN, file_line, func, msg);
+            return;
+          case ccl::INFO:
+          case ccl::WORK:
+          case ccl::STATS:
+          case ccl::DEBUG:
+          case ccl::UNKNOWN:
+            CLG_log_str(log_type, CLG_SEVERITY_INFO, file_line, func, msg);
+            return;
+        }
+      });
+
+  /* Map log level from CLOG. */
+  const CLG_LogType *log_type = CLOG_ENSURE(&LOG);
+  if (log_type->flag & CLG_FLAG_USE) {
+    switch (log_type->level) {
+      case 0:
+      case 1:
+        ccl::log_level_set(ccl::INFO);
+        break;
+      case 2:
+        ccl::log_level_set(ccl::WORK);
+        break;
+      case 3:
+        ccl::log_level_set(ccl::STATS);
+        break;
+      default:
+        ccl::log_level_set(ccl::DEBUG);
+        break;
+    }
+  }
+  else {
+    ccl::log_level_set(ccl::ERROR);
+  }
 }
diff --git a/intern/cycles/cmake/macros.cmake b/intern/cycles/cmake/macros.cmake
index 494618d6ddb..12f63cdb856 100644
--- a/intern/cycles/cmake/macros.cmake
+++ b/intern/cycles/cmake/macros.cmake
@@ -85,9 +85,6 @@ macro(cycles_external_libraries_append libraries)
       list(APPEND ${libraries} "opengl32")
     endif()
   endif()
-  if(WITH_CYCLES_LOGGING)
-    list(APPEND ${libraries} ${GLOG_LIBRARIES} ${GFLAGS_LIBRARIES})
-  endif()
   if(WITH_CYCLES_OSL)
     list(APPEND ${libraries} ${OSL_LIBRARIES})
   endif()
diff --git a/intern/cycles/hydra/plugin.cpp b/intern/cycles/hydra/plugin.cpp
index 1eac4ea495d..3a139cf960a 100644
--- a/intern/cycles/hydra/plugin.cpp
+++ b/intern/cycles/hydra/plugin.cpp
@@ -16,10 +16,8 @@
 
 PXR_NAMESPACE_OPEN_SCOPE
 
-#ifdef WITH_CYCLES_LOGGING
 TF_DEFINE_ENV_SETTING(CYCLES_LOGGING, false, "Enable Cycles logging")
-TF_DEFINE_ENV_SETTING(CYCLES_LOGGING_SEVERITY, 1, "Cycles logging verbosity")
-#endif
+TF_DEFINE_ENV_SETTING(CYCLES_LOGGING_LEVEL, "warning", "Cycles logging level")
 
 HdCyclesPlugin::HdCyclesPlugin()
 {
@@ -28,12 +26,9 @@ HdCyclesPlugin::HdCyclesPlugin()
   const std::string rootPath = PXR_NS::ArchAbsPath(plugin->GetResourcePath());
   CCL_NS::path_init(std::move(rootPath));
 
-#ifdef WITH_CYCLES_LOGGING
   if (TfGetEnvSetting(CYCLES_LOGGING)) {
-    CCL_NS::util_logging_start();
-    CCL_NS::util_logging_verbosity_set(TfGetEnvSetting(CYCLES_LOGGING_SEVERITY));
+    CCL_NS::log_level_set(TfGetEnvSetting(CYCLES_LOGGING_LEVEL));
   }
-#endif
 }
 
 HdCyclesPlugin::~HdCyclesPlugin() {}
diff --git a/intern/cycles/test/CMakeLists.txt b/intern/cycles/test/CMakeLists.txt
index c83a3e9971a..09ae60c2d62 100644
--- a/intern/cycles/test/CMakeLists.txt
+++ b/intern/cycles/test/CMakeLists.txt
@@ -2,7 +2,7 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 
-if(WITH_GTESTS AND WITH_CYCLES_LOGGING)
+if(WITH_GTESTS)
   # Otherwise we get warnings here that we can't fix in external projects
   remove_strict_flags()
 endif()
@@ -58,7 +58,7 @@ if(NOT APPLE)
   endif()
 endif()
 
-if(WITH_GTESTS AND WITH_CYCLES_LOGGING)
+if(WITH_GTESTS)
   set(INC_SYS )
   blender_add_test_suite_executable(cycles "${SRC}" "${INC}" "${INC_SYS}" "${LIB}")
 endif()
diff --git a/intern/cycles/test/render_graph_finalize_test.cpp b/intern/cycles/test/render_graph_finalize_test.cpp
index 2d73616d277..3f1bfbf0705 100644
--- a/intern/cycles/test/render_graph_finalize_test.cpp
+++ b/intern/cycles/test/render_graph_finalize_test.cpp
@@ -2,7 +2,6 @@
  *
  * SPDX-License-Identifier: Apache-2.0 */
 
-#include <glog/logging.h>
 #include <gtest/gtest.h>
 
 #include "device/device.h"
@@ -145,16 +144,23 @@ class ShaderGraphBuilder {
 
 /* A ScopedMockLog object intercepts log messages issued during its lifespan,
  * to test if the approriate logs are output. */
-class ScopedMockLog : google::LogSink {
+class ScopedMockLog {
  public:
   ScopedMockLog()
   {
-    AddLogSink(this);
+    log_init([](const LogLevel /*level*/,
+                const char * /*file_line*/,
+                const char * /*func*/,
+                const char *msg) {
+      static thread_mutex mutex;
+      thread_scoped_lock lock(mutex);
+      messages.push_back(msg);
+    });
   }
 
-  ~ScopedMockLog() override
+  ~ScopedMockLog()
   {
-    RemoveLogSink(this);
+    log_init(nullptr);
     messages.free_memory();
   }
 
@@ -182,19 +188,6 @@ class ScopedMockLog : google::LogSink {
 
  private:
   static vector<string> messages;
-
-  void send(google::LogSeverity /*severity*/,
-            const char * /*full_filename*/,
-            const char * /*base_filename*/,
-            int /*line*/,
-            const tm * /*tm_time*/,
-            const char *message,
-            size_t /*message_len*/) override
-  {
-    static thread_mutex mutex;
-    thread_scoped_lock lock(mutex);
-    messages.push_back(message);
-  }
 };
 
 vector<string> ScopedMockLog::messages;
@@ -230,15 +223,14 @@ class RenderGraph : public testing::Test {
     /* Initialize logging after the creation of the essential resources. This way the logging
      * mock sink does not warn about uninteresting messages which happens prior to the setup of
      * the actual mock sinks. */
-    util_logging_start();
-    util_logging_verbosity_set(5);
+    log_level_set(DEBUG);
   }
 
   void TearDown() override
   {
     /* Effectively disable logging, so that the next test suit starts in an environment which is
      * not logging by default. */
-    util_logging_verbosity_set(0);
+    log_level_set(FATAL);
 
     scene.reset();
     device_cpu.reset();
diff --git a/intern/cycles/util/log.cpp b/intern/cycles/util/log.cpp
index 8fb42b59881..64c153aee51 100644
--- a/intern/cycles/util/log.cpp
+++ b/intern/cycles/util/log.cpp
@@ -3,9 +3,9 @@
  * SPDX-License-Identifier: Apache-2.0 */
 
 #include "util/log.h"
-
 #include "util/math.h"
 #include "util/string.h"
+#include "util/time.h"
 
 #include <cstdio>
 #ifdef _MSC_VER
@@ -14,59 +14,122 @@
 
 CCL_NAMESPACE_BEGIN
 
-#ifdef WITH_CYCLES_LOGGING
-static bool is_verbosity_set()
+LogLevel LOG_LEVEL = DWARNING;
+static LogFunction LOG_FUNCTION;
+static double LOG_START_TIME = time_dt();
+
+const char *log_level_to_string(const LogLevel level)
 {
-  using CYCLES_GFLAGS_NAMESPACE::GetCommandLineOption;
-
-  string verbosity;
-  if (!GetCommandLineOption("v", &verbosity)) {
-    return false;
+  switch (level) {
+    case FATAL:
+    case DFATAL:
+      return "FATAL";
+    case ERROR:
+    case DERROR:
+      return "ERROR";
+    case WARNING:
+    case DWARNING:
+      return "WARNING";
+    case INFO:
+      return "INFO";
+    case WORK:
+      return "WORK";
+    case STATS:
+      return "STATS";
+    case DEBUG:
+      return "DEBUG";
+    case UNKNOWN:
+      return "UNKNOWN";
   }
-  return verbosity != "0";
-}
-#endif
 
-void util_logging_init(const char *argv0)
-{
-#ifdef WITH_CYCLES_LOGGING
-  using CYCLES_GFLAGS_NAMESPACE::SetCommandLineOption;
-
-  google::InitGoogleLogging(argv0);
-  SetCommandLineOption("logtostderr", "1");
-  if (!is_verbosity_set()) {
-    SetCommandLineOption("v", "0");
-  }
-  SetCommandLineOption("stderrthreshold", "0");
-  SetCommandLineOption("minloglevel", "0");
-#else
-  (void)argv0;
-#endif
+  return "";
 }
 
-void util_logging_start()
+LogLevel log_string_to_level(const string &str)
 {
-#ifdef WITH_CYCLES_LOGGING
-  using CYCLES_GFLAGS_NAMESPACE::SetCommandLineOption;
-  SetCommandLineOption("logtostderr", "1");
-  if (!is_verbosity_set()) {
-    SetCommandLineOption("v", "2");
+  const std::string str_lower = string_to_lower(str);
+
+  if (str_lower == "fatal") {
+    return FATAL;
   }
-  SetCommandLineOption("stderrthreshold", "0");
-  SetCommandLineOption("minloglevel", "0");
-#endif
+  if (str_lower == "error") {
+    return ERROR;
+  }
+  if (str_lower == "warning") {
+    return WARNING;
+  }
+  if (str_lower == "info") {
+    return FATAL;
+  }
+  if (str_lower == "work") {
+    return WORK;
+  }
+  if (str_lower == "stats") {
+    return STATS;
+  }
+  if (str_lower == "debug") {
+    return DEBUG;
+  }
+  return UNKNOWN;
 }
 
-void util_logging_verbosity_set(const int verbosity)
+void log_init(const LogFunction func)
 {
-#ifdef WITH_CYCLES_LOGGING
-  using CYCLES_GFLAGS_NAMESPACE::SetCommandLineOption;
-  char val[10];
-  snprintf(val, sizeof(val), "%d", verbosity);
-  SetCommandLineOption("v", val);
-#else
-  (void)verbosity;
-#endif
+  LOG_FUNCTION = func;
+  LOG_START_TIME = time_dt();
+}
+
+void log_level_set(const LogLevel level)
+{
+  LOG_LEVEL = level;
+}
+
+void log_level_set(const std::string &level)
+{
+  const LogLevel new_level = log_string_to_level(level);
+  if (new_level == UNKNOWN) {
+    LOG(ERROR) << "Unknown log level specified: " << level;
+    return;
+  }
+  LOG_LEVEL = new_level;
+}
+
+static void log_default(const LogLevel level, const std::string &time_str, const char *msg)
+{
+  if (level >= INFO) {
+    printf("%s | %s\n", time_str.c_str(), msg);
+  }
+  else {
+    fflush(stdout);
+    fprintf(stderr, "%s | %s: %s\n", time_str.c_str(), log_level_to_string(level), msg);
+  }
+}
+
+void _log_message(const LogLevel level, const char *file_line, const char *func, const char *msg)
+{
+  assert(level <= LOG_LEVEL);
+
+  if (LOG_FUNCTION) {
+    LOG_FUNCTION(level, file_line, func, msg);
+    return;
+  }
+
+  const std::string time_str = time_human_readable_from_seconds(time_dt() - LOG_START_TIME);
+
+  if (strchr(msg, '\n') == nullptr) {
+    log_default(level, time_str, msg);
+    return;
+  }
+
+  vector<string> lines;
+  string_split(lines, msg, "\n", false);
+  for (const string &line : lines) {
+    log_default(level, time_str, line.c_str());
+  }
+
+  if (level == FATAL || level == DFATAL) {
+    abort();
+  }
 }
 
 std::ostream &operator<<(std::ostream &os, const int2 &value)
diff --git a/intern/cycles/util/log.h b/intern/cycles/util/log.h
index 20a2f919f40..2006e60b0e9 100644
--- a/intern/cycles/util/log.h
+++ b/intern/cycles/util/log.h
@@ -4,89 +4,154 @@
 
 #pragma once
 
-#if defined(WITH_CYCLES_LOGGING) && !defined(__KERNEL_GPU__)
-#  include <gflags/gflags.h>  // IWYU pragma: export
-#  include <glog/logging.h>   // IWYU pragma: export
-#endif
+#include "util/defines.h"
+#include "util/string.h"
+#include "util/types.h"
 
-#include <iosfwd>
+#include <sstream>
 
 CCL_NAMESPACE_BEGIN
 
-#if !defined(WITH_CYCLES_LOGGING) || defined(__KERNEL_GPU__)
-class StubStream {
+enum LogLevel {
+  FATAL = 0,
+  DFATAL = 1,
+  ERROR = 2,
+  DERROR = 3,
+  WARNING = 4,
+  DWARNING = 5,
+  INFO = 6,
+  WORK = 7,
+  STATS = 8,
+  DEBUG = 9,
+  UNKNOWN = -1,
+};
+
+const char *log_level_to_string(const LogLevel level);
+LogLevel log_string_to_level(const string &str);
+
+using LogFunction = void (*)(const LogLevel level,
+                             const char *file_line,
+                             const char *func,
+                             const char *msg);
+
+void log_init(const LogFunction func = nullptr);
+void log_level_set(const LogLevel level);
+void log_level_set(const string &level);
+
+void _log_message(const LogLevel level, const char *file_line, const char *func, const char *msg);
+
+class LogMessage {
  public:
-  template<class T> StubStream &operator<<(const T &)
+  LogMessage(enum LogLevel level, const char *file_line, const char *func)
+      : level_(level), file_line_(file_line), func_(func)
   {
-    return *this;
   }
+
+  ~LogMessage()
+  {
+    _log_message(level_, file_line_, func_, stream_.str().c_str());
+  }
+
+  std::ostream &stream()
+  {
+    return stream_;
+  }
+
+ protected:
+  LogLevel level_;
+  const char *file_line_;
+  const char *func_;
+  std::stringstream stream_;
 };
 
-class LogMessageVoidify {
- public:
-  LogMessageVoidify() {}
-  void operator&(const StubStream &) {}
-};
+extern LogLevel LOG_LEVEL;
 
-#  define LOG_SUPPRESS() (true) ? ((void)0) : LogMessageVoidify() & StubStream()
-#  define LOG(severity) LOG_SUPPRESS()
-#  define VLOG(severity) LOG_SUPPRESS()
-#  define VLOG_IF(severity, condition) LOG_SUPPRESS()
-#  define VLOG_IS_ON(severity) false
+#define LOG_STRINGIFY_APPEND(a, b) "" a #b
+#define LOG_STRINGIFY(x) LOG_STRINGIFY_APPEND("", x)
 
-#  define CHECK(expression) LOG_SUPPRESS()
+#ifdef NDEBUG
+#  define VLOG_IF(level, condition) \
+    if constexpr (level != DFATAL && level != DERROR && level != DWARNING) \
+      if (LIKELY(!(level <= LOG_LEVEL && (condition)))) \
+        ; \
+      else \
+        LogMessage(level, __FILE__ ":" LOG_STRINGIFY(__LINE__), __func__).stream()
+#else
+#  define VLOG_IF(level, condition) \
+    if (LIKELY(!(level <= LOG_LEVEL && (condition)))) \
+      ; \
+    else \
+      LogMessage(level, __FILE__ ":" LOG_STRINGIFY(__LINE__), __func__).stream()
+#endif
 
-#  define CHECK_NOTNULL(expression) (expression)
+// TODO: remove distinction
+#define VLOG(level) VLOG_IF(level, true)
+#define LOG(level) VLOG_IF(level, true)
 
-#  define CHECK_NEAR(actual, expected, eps) LOG_SUPPRESS()
+#define VLOG_IS_ON(level) ((level) <= LOG_LEVEL)
 
-#  define CHECK_GE(a, b) LOG_SUPPRESS()
-#  define CHECK_NE(a, b) LOG_SUPPRESS()
-#  define CHECK_EQ(a, b) LOG_SUPPRESS()
-#  define CHECK_GT(a, b) LOG_SUPPRESS()
-#  define CHECK_LT(a, b) LOG_SUPPRESS()
-#  define CHECK_LE(a, b) LOG_SUPPRESS()
+#define CHECK(expression) VLOG_IF(FATAL, !(expression))
+#define CHECK_OP(op, a, b) VLOG_IF(FATAL, !((a)op(b)))
+#define CHECK_GE(a, b) CHECK_OP(>=, a, b)
+#define CHECK_NE(a, b) CHECK_OP(!=, a, b)
+#define CHECK_EQ(a, b) CHECK_OP(==, a, b)
+#define CHECK_GT(a, b) CHECK_OP(>, a, b)
+#define CHECK_LT(a, b) CHECK_OP(<, a, b)
+#define CHECK_LE(a, b) CHECK_OP(<=, a, b)
 
+#ifndef NDEBUG
+template<typename T> T DCheckNotNull(T &&t, const char *expression)
+{
+  if (t == nullptr) {
+    LOG(FATAL) << "Failed " << expression << "is not null";
+  }
+  return std::forward<T>(t);
+}
+
+#  define DCHECK(expression) VLOG_IF(DFATAL, !(expression)) << LOG_STRINGIFY(expression) << " "
+#  define DCHECK_NOTNULL(expression) DCheckNotNull(expression, LOG_STRINGIFY(expression))
+#  define DCHECK_OP(op, a, b) \
+    VLOG_IF(DFATAL, !((a)op(b))) << "Failed " << LOG_STRINGIFY(a) << " (" << a << ") " \
+                                 << LOG_STRINGIFY(op) << " " << LOG_STRINGIFY(b) << " (" << b \
+                                 << ") "
+#  define DCHECK_GE(a, b) DCHECK_OP(>=, a, b)
+#  define DCHECK_NE(a, b) DCHECK_OP(!=, a, b)
+#  define DCHECK_EQ(a, b) DCHECK_OP(==, a, b)
+#  define DCHECK_GT(a, b) DCHECK_OP(>, a, b)
+#  define DCHECK_LT(a, b) DCHECK_OP(<, a, b)
+#  define DCHECK_LE(a, b) DCHECK_OP(<=, a, b)
+#else
+#  define LOG_SUPPRESS() VLOG_IF(DEBUG, false)
 #  define DCHECK(expression) LOG_SUPPRESS()
-
 #  define DCHECK_NOTNULL(expression) (expression)
-
-#  define DCHECK_NEAR(actual, expected, eps) LOG_SUPPRESS()
-
 #  define DCHECK_GE(a, b) LOG_SUPPRESS()
 #  define DCHECK_NE(a, b) LOG_SUPPRESS()
 #  define DCHECK_EQ(a, b) LOG_SUPPRESS()
 #  define DCHECK_GT(a, b) LOG_SUPPRESS()
 #  define DCHECK_LT(a, b) LOG_SUPPRESS()
 #  define DCHECK_LE(a, b) LOG_SUPPRESS()
-
-#  define LOG_ASSERT(expression) LOG_SUPPRESS()
 #endif
 
 /* Verbose logging categories. */
 
 /* Warnings. */
-#define VLOG_WARNING VLOG(1)
+#define VLOG_WARNING VLOG(WARNING)
 /* Info about devices, scene contents and features used. */
-#define VLOG_INFO VLOG(2)
-#define VLOG_INFO_IS_ON VLOG_IS_ON(2)
+#define VLOG_INFO VLOG(INFO)
+#define VLOG_INFO_IS_ON VLOG_IS_ON(INFO)
 /* Work being performed and timing/memory stats about that work. */
-#define VLOG_WORK VLOG(3)
-#define VLOG_WORK_IS_ON VLOG_IS_ON(3)
+#define VLOG_WORK VLOG(WORK)
+#define VLOG_WORK_IS_ON VLOG_IS_ON(WORK)
 /* Detailed device timing stats. */
-#define VLOG_DEVICE_STATS VLOG(4)
-#define VLOG_DEVICE_STATS_IS_ON VLOG_IS_ON(4)
+#define VLOG_DEVICE_STATS VLOG(STATS)
+#define VLOG_DEVICE_STATS_IS_ON VLOG_IS_ON(STATS)
 /* Verbose debug messages. */
-#define VLOG_DEBUG VLOG(5)
-#define VLOG_DEBUG_IS_ON VLOG_IS_ON(5)
+#define VLOG_DEBUG VLOG(DEBUG)
+#define VLOG_DEBUG_IS_ON VLOG_IS_ON(DEBUG)
 
 struct int2;
 struct float3;
 
-void util_logging_init(const char *argv0);
-void util_logging_start();
-void util_logging_verbosity_set(const int verbosity);
-
 std::ostream &operator<<(std::ostream &os, const int2 &value);
 std::ostream &operator<<(std::ostream &os, const float3 &value);
 
diff --git a/release/windows/batch/blender_debug_cycles.cmd b/release/windows/batch/blender_debug_cycles.cmd
index a62893e1e2c..b41ca34b332 100644
--- a/release/windows/batch/blender_debug_cycles.cmd
+++ b/release/windows/batch/blender_debug_cycles.cmd
@@ -16,5 +16,5 @@ set PYTHONPATH=
 set DEBUGLOGS="%temp%\blender\debug_logs"
 mkdir "%DEBUGLOGS%" > NUL 2>&1
 
-"%~dp0\blender" --debug --debug-cycles --verbose 8 --log-level -1 --python-expr "import bpy; bpy.context.preferences.filepaths.temporary_directory=r'%DEBUGLOGS%'; bpy.ops.wm.sysinfo(filepath=r'%DEBUGLOGS%\blender_system_info.txt')" > "%DEBUGLOGS%\blender_debug_output.txt" 2>&1 < %0
+"%~dp0\blender" --debug --log cycles --log-level 4 --python-expr "import bpy; bpy.context.preferences.filepaths.temporary_directory=r'%DEBUGLOGS%'; bpy.ops.wm.sysinfo(filepath=r'%DEBUGLOGS%\blender_system_info.txt')" > "%DEBUGLOGS%\blender_debug_output.txt" 2>&1 < %0
 explorer "%DEBUGLOGS%"
diff --git a/release/windows/batch/blender_debug_gpu.cmd b/release/windows/batch/blender_debug_gpu.cmd
index 3598583db05..3fb1a1dfce2 100644
--- a/release/windows/batch/blender_debug_gpu.cmd
+++ b/release/windows/batch/blender_debug_gpu.cmd
@@ -17,5 +17,5 @@ set DEBUGLOGS="%temp%\blender\debug_logs"
 set VK_LOADER_DEBUG=all
 mkdir "%DEBUGLOGS%" > NUL 2>&1
 
-"%~dp0\blender" --debug --debug-gpu --debug-cycles --python-expr "import bpy; bpy.context.preferences.filepaths.temporary_directory=r'%DEBUGLOGS%'; bpy.ops.wm.sysinfo(filepath=r'%DEBUGLOGS%\blender_system_info.txt')" > "%DEBUGLOGS%\blender_debug_output.txt" 2>&1 < %0
+"%~dp0\blender" --debug --debug-gpu --log cycles --python-expr "import bpy; bpy.context.preferences.filepaths.temporary_directory=r'%DEBUGLOGS%'; bpy.ops.wm.sysinfo(filepath=r'%DEBUGLOGS%\blender_system_info.txt')" > "%DEBUGLOGS%\blender_debug_output.txt" 2>&1 < %0
 explorer "%DEBUGLOGS%"
diff --git a/release/windows/batch/blender_debug_log.cmd b/release/windows/batch/blender_debug_log.cmd
index 2676ef7887f..47e25ab740d 100644
--- a/release/windows/batch/blender_debug_log.cmd
+++ b/release/windows/batch/blender_debug_log.cmd
@@ -16,5 +16,5 @@ set PYTHONPATH=
 set DEBUGLOGS="%temp%\blender\debug_logs"
 mkdir "%DEBUGLOGS%" > NUL 2>&1
 
-"%~dp0\blender" --debug --debug-cycles --python-expr "import bpy; bpy.context.preferences.filepaths.temporary_directory=r'%DEBUGLOGS%'; bpy.ops.wm.sysinfo(filepath=r'%DEBUGLOGS%\blender_system_info.txt')" > "%DEBUGLOGS%\blender_debug_output.txt" 2>&1 < %0
+"%~dp0\blender" --debug --log cycles --python-expr "import bpy; bpy.context.preferences.filepaths.temporary_directory=r'%DEBUGLOGS%'; bpy.ops.wm.sysinfo(filepath=r'%DEBUGLOGS%\blender_system_info.txt')" > "%DEBUGLOGS%\blender_debug_output.txt" 2>&1 < %0
 explorer "%DEBUGLOGS%"
diff --git a/source/creator/CMakeLists.txt b/source/creator/CMakeLists.txt
index 30094afd520..4a49c7e0f8b 100644
--- a/source/creator/CMakeLists.txt
+++ b/source/creator/CMakeLists.txt
@@ -52,10 +52,7 @@ endif()
 
 if(WITH_CYCLES)
   add_definitions(-DWITH_CYCLES)
-  if(WITH_CYCLES_LOGGING)
-    list(APPEND INC ../../intern/cycles/blender)
-    add_definitions(-DWITH_CYCLES_LOGGING)
-  endif()
+  list(APPEND INC ../../intern/cycles/blender)
 endif()
 
 if(WITH_OPENGL_BACKEND)
diff --git a/source/creator/creator.cc b/source/creator/creator.cc
index afff8a69298..da9e250c0ee 100644
--- a/source/creator/creator.cc
+++ b/source/creator/creator.cc
@@ -93,7 +93,9 @@
 
 #ifdef WITH_LIBMV
 #  include "libmv-capi.h"
-#elif defined(WITH_CYCLES_LOGGING)
+#endif
+
+#ifdef WITH_CYCLES
 #  include "CCL_api.h"
 #endif
 
@@ -405,8 +407,6 @@ int main(int argc,
 
 #ifdef WITH_LIBMV
   libmv_initLogging(argv[0]);
-#elif defined(WITH_CYCLES_LOGGING)
-  CCL_init_logging(argv[0]);
 #endif
 
 #if defined(WITH_TBB_MALLOC) && defined(_MSC_VER) && defined(NDEBUG) && defined(WITH_GMP)
@@ -496,6 +496,10 @@ int main(int argc,
   /* Continue with regular initialization, no need to use "early" exit. */
   app_init_data.early_exit = nullptr;
 
+#ifdef WITH_CYCLES
+  CCL_log_init();
+#endif
+
   /* Must be initialized after #BKE_appdir_init to account for color-management paths. */
   IMB_init();
   /* Keep after #ARG_PASS_SETTINGS since debug flags are checked. */
diff --git a/source/creator/creator_args.cc b/source/creator/creator_args.cc
index 9b2dfb1efa9..feaa8fc0ce1 100644
--- a/source/creator/creator_args.cc
+++ b/source/creator/creator_args.cc
@@ -69,7 +69,7 @@
 #    include "libmv-capi.h"
 #  endif
 
-#  ifdef WITH_CYCLES_LOGGING
+#  ifdef WITH_CYCLES
 #    include "CCL_api.h"
 #  endif
 
@@ -90,7 +90,6 @@
 struct BuildDefs {
   bool win32;
   bool with_cycles;
-  bool with_cycles_logging;
   bool with_ffmpeg;
   bool with_freestyle;
   bool with_libmv;
@@ -117,9 +116,6 @@ static void build_defs_init(BuildDefs *build_defs, bool force_all)
 #  ifdef WITH_CYCLES
   build_defs->with_cycles = true;
 #  endif
-#  ifdef WITH_CYCLES_LOGGING
-  build_defs->with_cycles_logging = true;
-#  endif
 #  ifdef WITH_FFMPEG
   build_defs->with_ffmpeg = true;
 #  endif
@@ -741,9 +737,6 @@ static void print_help(bArgs *ba, bool all)
   if (defs.with_libmv) {
     BLI_args_print_arg_doc(ba, "--debug-libmv");
   }
-  if (defs.with_cycles_logging) {
-    BLI_args_print_arg_doc(ba, "--debug-cycles");
-  }
   BLI_args_print_arg_doc(ba, "--debug-memory");
   BLI_args_print_arg_doc(ba, "--debug-jobs");
   BLI_args_print_arg_doc(ba, "--debug-python");
@@ -1393,9 +1386,6 @@ static int arg_handle_debug_mode_all(int /*argc*/, const char ** /*argv*/, void
   G.debug |= G_DEBUG_ALL;
 #  ifdef WITH_LIBMV
   libmv_startDebugLogging();
-#  endif
-#  ifdef WITH_CYCLES_LOGGING
-  CCL_start_debug_logging();
 #  endif
   return 0;
 }
@@ -1416,9 +1406,8 @@ static const char arg_handle_debug_mode_cycles_doc[] =
     "Enable debug messages from Cycles.";
 static int arg_handle_debug_mode_cycles(int /*argc*/, const char ** /*argv*/, void * /*data*/)
 {
-#  ifdef WITH_CYCLES_LOGGING
-  CCL_start_debug_logging();
-#  endif
+  const char *cycles_filter = "cycles.*";
+  CLG_type_filter_include(cycles_filter, strlen(cycles_filter));
   return 0;
 }
 
@@ -2094,10 +2083,6 @@ static int arg_handle_verbosity_set(int argc, const char **argv, void * /*data*/
 
 #  ifdef WITH_LIBMV
     libmv_setLoggingVerbosity(level);
-#  elif defined(WITH_CYCLES_LOGGING)
-    CCL_logging_verbosity_set(level);
-#  else
-    (void)level;
 #  endif
 
     return 1;
@@ -2821,7 +2806,7 @@ void main_args_setup(bContext *C, bArgs *ba, bool all)
   if (defs.with_libmv) {
     BLI_args_add(ba, nullptr, "--debug-libmv", CB(arg_handle_debug_mode_libmv), nullptr);
   }
-  if (defs.with_cycles_logging) {
+  if (defs.with_cycles) {
     BLI_args_add(ba, nullptr, "--debug-cycles", CB(arg_handle_debug_mode_cycles), nullptr);
   }
   BLI_args_add(ba, nullptr, "--debug-memory", CB(arg_handle_debug_mode_memory_set), nullptr);