Added a basic Logging system. Currently calls SDL_ShowSimpleMessageBox(...).

build/vs/vs.vcxproj

@@ -75,6 +75,7 @@ xcopy /d /y "..\..\..\..\Dev\SDL2-2.0.3\lib\x86\SDL2.dll" "$(OutDir)"</Command>
     </Link>
   </ItemDefinitionGroup>
   <ItemGroup>
+    <ClCompile Include="..\..\src\Log.cpp" />
     <ClCompile Include="..\..\src\main.cpp" />
     <ClCompile Include="..\..\src\Mat4.cpp" />
     <ClCompile Include="..\..\src\RenderCamera.cpp" />
@@ -96,6 +97,7 @@ xcopy /d /y "..\..\..\..\Dev\SDL2-2.0.3\lib\x86\SDL2.dll" "$(OutDir)"</Command>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\..\src\common.hpp" />
+    <ClInclude Include="..\..\src\Log.hpp" />
     <ClInclude Include="..\..\src\Mat4.hpp" />
     <ClInclude Include="..\..\src\RenderCamera.hpp" />
     <ClInclude Include="..\..\src\RenderObject.hpp" />

build/vs/vs.vcxproj.filters

@@ -45,6 +45,9 @@
     <ClCompile Include="..\..\src\Mat4.cpp">
       <Filter>Classes</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\src\Log.cpp">
+      <Filter>Classes</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <None Include="..\..\..\..\Dev\SDL2-2.0.3\lib\x86\SDL2.dll">
@@ -79,5 +82,8 @@
     <ClInclude Include="..\..\src\Mat4.hpp">
       <Filter>Classes</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\src\Log.hpp">
+      <Filter>Classes</Filter>
+    </ClInclude>
   </ItemGroup>
 </Project>

src/Log.cpp

@@ -0,0 +1,42 @@
+/* ================================================================
+Log
+----------------
+This file defines the class for Log.
+================================================================ */
+#include "Log.hpp"
+
+Log::Log() {}
+
+std::ostringstream& Log::Get(LogLevel level) {
+  l = level;
+  time_t current_time = time(0);
+  struct tm *ltm;
+#ifdef _MSC_VER
+  struct tm lltm;
+  localtime_s(&lltm, &current_time);
+  ltm = &lltm;
+#else
+  ltm = localtime(&current_time);
+#endif
+  os << 1900+ltm->tm_year << "/" << 1+ltm->tm_mon << "/" << ltm->tm_mday << " " << ltm->tm_hour << ":" << ltm->tm_min << ':' << ltm->tm_sec;
+  os << "\n";
+  return os;
+}
+Log::~Log() {
+  os << std::endl;
+  fprintf(stderr, "%s\n", os.str().c_str());
+  fflush(stderr);
+  char *title = "Undefined";
+  switch(l) {
+  case LOG_ERROR:
+    title = "Error";
+    break;
+  case LOG_WARNING:
+    title = "Warning";
+    break;
+  case LOG_DEBUG:
+    title = "Debug";
+    break;
+  }
+  SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, title, os.str().c_str(), NULL);
+}

src/Log.hpp

@@ -0,0 +1,42 @@
+/* ================================================================
+Log
+----------------
+This header file describes the Log class
+================================================================ */
+#ifndef LOG_HPP
+#define LOG_HPP
+
+#include <SDL.h>
+#include <iostream>
+#include <sstream>
+#include <ctime>
+#include <time.h>
+#include <string>
+
+#ifdef _MSC_VER // Visual Studio
+#define FUNC_NAME __FUNCSIG__
+#else // GCC/clang
+#define FUNC_NAME __PRETTY_FUNCTION__
+#endif
+
+enum LogLevel { LOG_ERROR, LOG_WARNING, LOG_DEBUG };
+
+class Log {
+  public:
+    Log();
+    virtual ~Log();
+    std::ostringstream& Get(LogLevel level = LOG_DEBUG);
+  protected:
+    std::ostringstream os;
+  private:
+    int l;
+    Log(const Log&);
+    Log& operator =(const Log&);
+};
+
+#ifndef MAX_LOG_LEVEL
+#define MAX_LOG_LEVEL LOG_ERROR
+#endif
+#define LOG(level) if (level > MAX_LOG_LEVEL) ; else Log().Get(level)
+
+#endif

src/RenderScene.cpp

@@ -4,11 +4,14 @@ RenderScene
 This header file defines the RenderScene class.
 ================================================================ */
 #include "RenderScene.hpp"
+#include "Log.hpp"
 #include <stdexcept>      // for std::out_of_range
 #include <iostream>       // for std::cerr
 #include <algorithm>      // for std::find
+
 /* ======== Constructors and Destructors ======== */
 RenderScene::RenderScene() {
+
 }
 RenderScene::~RenderScene() {
 }
@@ -18,7 +21,7 @@ int RenderScene::addCamera(RenderCamera* camera) {
   try {
     cameras.push_back(camera);
   } catch(...) {
-    std::cerr << __PRETTY_FUNCTION__ << ": Could not add RenderCamera" << '\n';
+    LOG(LOG_ERROR) << FUNC_NAME << ": Could not add RenderCamera";
   }
   // return size regardless of success, likely The Wrong Thing
   return cameras.size();
@@ -29,6 +32,7 @@ int RenderScene::remCamera(int id) {
     cameras.erase(cameras.begin()+(id-1));
     return 0;
   }
+  LOG(LOG_WARNING) << FUNC_NAME << ": Could not remove RenderCamera " << id;
   return 1;
 }
 int RenderScene::remCamera(RenderCamera *camera) {
@@ -37,6 +41,7 @@ int RenderScene::remCamera(RenderCamera *camera) {
     cameras.erase(it);
     return 0;
   }
+  LOG(LOG_WARNING) << FUNC_NAME << ": Could not remove RenderCamera";
   return 1;
 }
 
@@ -44,8 +49,7 @@ RenderCamera* RenderScene::getCamera(int id) {
   try {
     return cameras.at(id-1);
   } catch (const std::out_of_range& oor) {
-    std::cerr << __PRETTY_FUNCTION__ << ": Camera index out of range: "
-      << oor.what() << '\n';
+    LOG(LOG_ERROR) << FUNC_NAME << ": RenderCamera index out of range: " << oor.what();
   }
   return NULL;
 }