Use the SDL2 perf counter (#50)

Using SDL2 functions will allow us to be compatible to more platforms
and not having to maintain our own implementations for each platform.

4 files changed, 9 insertions, 91 deletions

diff --git a/Projects/CMakeLists.txt b/Projects/CMakeLists.txt
index 21c9fce2..5be55093 100644
--- a/Projects/CMakeLists.txt
+++ b/Projects/CMakeLists.txt
@@ -1147,6 +1147,7 @@ FILE(GLOB OVERGROWTH_INTERNAL_SRCS RELATIVE ${CMAKE_SOURCE_DIR}
     ${SRCDIR}/Compat/compat.h
     ${SRCDIR}/Compat/filepath.h
     ${SRCDIR}/Compat/hardware_info.h
+    ${SRCDIR}/Compat/time.cpp
     ${SRCDIR}/Compat/time.h
     ${SRCDIR}/Compat/os_dialogs.h
     ${SRCDIR}/Compat/fileio.cpp
@@ -1171,7 +1172,6 @@ IF(LINUX)
         ${SRCDIR}/Compat/Linux/linux_compat.cpp
         ${SRCDIR}/Compat/Linux/linux_compat.h
         ${SRCDIR}/Compat/Linux/linux_hardware_info.cpp
-        ${SRCDIR}/Compat/Linux/linux_time.cpp
     )
 ENDIF()
 
@@ -1184,7 +1184,6 @@ IF(APPLE)
         ${SRCDIR}/Compat/Mac/mac_compat.mm
         ${SRCDIR}/Compat/Mac/mac_compat.h
         ${SRCDIR}/Compat/Mac/mac_hardware_info.cpp
-        ${SRCDIR}/Compat/Mac/mac_time.cpp
     )
 ENDIF()
 
@@ -1195,7 +1194,6 @@ IF(WIN32)
             ${SRCDIR}/Compat/Win/win_compat.cpp 
             ${SRCDIR}/Compat/Win/win_compat.h
             ${SRCDIR}/Compat/Win/win_hardware_info.cpp
-            ${SRCDIR}/Compat/Win/win_time.cpp
 	)
 
 	IF(MSVC_VERSION LESS 1911)
diff --git a/Source/Compat/Mac/mac_time.cpp b/Source/Compat/Mac/mac_time.cpp
deleted file mode 100644
index 6607b42a..00000000
--- a/Source/Compat/Mac/mac_time.cpp
+++ /dev/null
@@ -1,35 +0,0 @@
-//-----------------------------------------------------------------------------
-//           Name: mac_time.cpp
-//      Developer: Wolfire Games LLC
-//    Description: 
-//        License: Read below
-//-----------------------------------------------------------------------------
-//
-//   Copyright 2022 Wolfire Games LLC
-//
-//   Licensed under the Apache License, Version 2.0 (the "License");
-//   you may not use this file except in compliance with the License.
-//   You may obtain a copy of the License at
-//
-//       http://www.apache.org/licenses/LICENSE-2.0
-//
-//   Unless required by applicable law or agreed to in writing, software
-//   distributed under the License is distributed on an "AS IS" BASIS,
-//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-//   See the License for the specific language governing permissions and
-//   limitations under the License.
-//
-//-----------------------------------------------------------------------------
-#include <Compat/time.h>
-
-#include <CoreServices/CoreServices.h>
-
-uint64_t GetPrecisionTime() {
-    AbsoluteTime upTime = UpTime();
-    return *(uint64_t*)&upTime;
-}
-
-uint64_t ToNanoseconds(uint64_t time){
-    Nanoseconds elapsedNano = AbsoluteToNanoseconds(*(AbsoluteTime*)&time );
-    return *(uint64_t*)&elapsedNano;
-}
diff --git a/Source/Compat/Win/win_time.cpp b/Source/Compat/Win/win_time.cpp
deleted file mode 100644
index 6751fe7c..00000000
--- a/Source/Compat/Win/win_time.cpp
+++ /dev/null
@@ -1,42 +0,0 @@
-//-----------------------------------------------------------------------------
-//           Name: win_time.cpp
-//      Developer: Wolfire Games LLC
-//    Description: 
-//        License: Read below
-//-----------------------------------------------------------------------------
-//
-//   Copyright 2022 Wolfire Games LLC
-//
-//   Licensed under the Apache License, Version 2.0 (the "License");
-//   you may not use this file except in compliance with the License.
-//   You may obtain a copy of the License at
-//
-//       http://www.apache.org/licenses/LICENSE-2.0
-//
-//   Unless required by applicable law or agreed to in writing, software
-//   distributed under the License is distributed on an "AS IS" BASIS,
-//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-//   See the License for the specific language governing permissions and
-//   limitations under the License.
-//
-//-----------------------------------------------------------------------------
-#include <Compat/time.h>
-
-#define NOMINMAX
-#include <windows.h>
-
-uint64_t GetPrecisionTime() {
-    LARGE_INTEGER tick;
-    QueryPerformanceCounter(&tick);
-    return (uint64_t)tick.QuadPart;
-}
-
-uint64_t ToNanoseconds(uint64_t time){
-    LARGE_INTEGER ticksPerSecond;
-    QueryPerformanceFrequency(&ticksPerSecond);
-    
-    time *= 1000000000;
-    time /= ticksPerSecond.QuadPart;
-
-    return time;
-}
diff --git a/Source/Compat/Linux/linux_time.cpp b/Source/Compat/time.cpp
index 8b10f287..a35da9c2 100644
--- a/Source/Compat/Linux/linux_time.cpp
+++ b/Source/Compat/time.cpp
@@ -1,5 +1,5 @@
 //-----------------------------------------------------------------------------
-//           Name: linux_time.cpp
+//           Name: time.cpp
 //      Developer: Wolfire Games LLC
 //    Description: 
 //        License: Read below
@@ -20,19 +20,16 @@
 //   limitations under the License.
 //
 //-----------------------------------------------------------------------------
-#include <Compat/time.h>
-
-#include <sys/time.h>
-#include <stdlib.h>
+#include "time.h"
+#include <SDL.h>
 
 uint64_t GetPrecisionTime() {
-    struct timeval time;
-    
-    gettimeofday(&time, NULL);
-    return time.tv_usec +
-            (time.tv_sec * 1000 * 1000);
+    return SDL_GetPerformanceCounter();
 }
 
 uint64_t ToNanoseconds(uint64_t time){
-    return time * 1000;
+    uint64_t ticksPerSecond = SDL_GetPerformanceFrequency();
+
+    // Multiply with 1e9 to get nanoseconds
+    return time * 1e9 / ticksPerSecond;
 }