show log in game

src/game/Log.cpp

@@ -1,10 +1,13 @@
 #include "Log.h"
 #include "bx/handlealloc.h"
 #include "bx/hash.h"
+#include "bx/timer.h"
 #include <bx/string.h>
 #define WIN32_LEAN_AND_MEAN
 #include "Windows.h"
 
+#include "Instance.h"
+
 #define ESC "\x1B["
 #define YELLOW ESC "33m"
 #define RED ESC "31m"
@@ -12,9 +15,11 @@
 
 namespace
 {
-    char LineBuffer[1024]{0};
-    char OutBuffer[1024]{0};
+    char LineBuffer[LogInternal::MaxLineSize]{0};
+    char OutBuffer[LogInternal::MaxLineSize]{0};
     bx::HandleHashMapT<1024> OnceMap;
+    LogHistory History;
+
     constexpr char LogFormat[]{"%s\n"};
     constexpr char WarnFormat[]{YELLOW "%s" END "\n"};
     constexpr char ErrorFormat[]{RED "%s" END "\n"};
@@ -33,6 +38,11 @@ void Log(ELogType logType, const char* file, uint32_t line, const char* format,
     bx::vsnprintf(OutBuffer, sizeof(OutBuffer), LineBuffer, args);
     va_end(args);
     OutputDebugStringA(OutBuffer);
+
+    bx::strCopy(&History.LogBuffer[History.WriteIdx * LogInternal::MaxLineSize], LogInternal::MaxLineSize, OutBuffer);
+    History.WriteTime[History.WriteIdx] = bx::getHPCounter();
+    ++History.WriteIdx;
+    if (History.WriteIdx >= LogInternal::LogHistorySize) History.WriteIdx = 0;
 }
 
 bool WasLogged(ELogType logType, const char* file, uint32_t line, const char* format)
@@ -48,3 +58,8 @@ bool WasLogged(ELogType logType, const char* file, uint32_t line, const char* fo
     OnceMap.insert(hash, {});
     return false;
 }
+
+LogHistory& GetLogHistory()
+{
+    return History;
+}

src/game/Log.h

@@ -27,5 +27,19 @@ enum class ELogType
     Error,
 };
 
+namespace LogInternal
+{
+    constexpr int32_t MaxLineSize = 1024;
+    constexpr int32_t LogHistorySize = 1024;
+} // namespace LogInternal
+
+struct LogHistory
+{
+    char LogBuffer[LogInternal::MaxLineSize * LogInternal::LogHistorySize]{0};
+    int32_t WriteIdx = 0;
+    int64_t WriteTime[LogInternal::LogHistorySize]{0};
+};
+
 void Log(ELogType logType, const char* file, uint32_t line, const char* format, ...);
 bool WasLogged(ELogType logType, const char* file, uint32_t line, const char* format);
+LogHistory& GetLogHistory();

src/game/rendering/Rendering.cpp

@@ -474,6 +474,22 @@ namespace Game
             debug.DebugCardRotation++;
             if (debug.DebugCardRotation >= 4) debug.DebugCardRotation = 0;
         }
+        if (ImGui::Begin("Log"))
+        {
+            for (int32_t i = 0; i < bx::min(100, LogInternal::LogHistorySize); ++i)
+            {
+                int32_t idx = GetLogHistory().WriteIdx - i - 1;
+                if (idx < 0) idx += LogInternal::LogHistorySize;
+                const char* line = &GetLogHistory().LogBuffer[idx * LogInternal::MaxLineSize];
+                if (line[0] != 0)
+                {
+                    int64_t timeOffset = GetLogHistory().WriteTime[idx] - GetInstance().Time.StartTime;
+                    double writeTime = (double)timeOffset / bx::getHPFrequency();
+                    ImGui::Text("%.04f: %s", writeTime, line);
+                }
+            }
+        }
+        ImGui::End();
         if (ImGui::Begin("Rendering"))
         {
             if (LastShaderLoadTime >= 0.0f)