From 6c80168e8c57172728350af844449b172950f648 Mon Sep 17 00:00:00 2001
From: Patedam <pgillen.pro@gmail.com>
Date: Sun, 12 Jan 2025 17:26:58 -0500
Subject: [PATCH] Can load dynamic library (dll) instead of linking against.
 Allow to not link against d3d12 lib

---
 Juliet/Juliet.vcxproj                         | 57 +++++++++++++-
 Juliet/include/Core/DynLib/DynamicLibrary.h   | 14 ++++
 .../src/Core/DynLib/Win32/DynamicLibrary.cpp  | 75 +++++++++++++++++++
 3 files changed, 145 insertions(+), 1 deletion(-)
 create mode 100644 Juliet/include/Core/DynLib/DynamicLibrary.h
 create mode 100644 Juliet/src/Core/DynLib/Win32/DynamicLibrary.cpp

diff --git a/Juliet/Juliet.vcxproj b/Juliet/Juliet.vcxproj
index 2cc8c2e..7279447 100644
--- a/Juliet/Juliet.vcxproj
+++ b/Juliet/Juliet.vcxproj
@@ -70,7 +70,7 @@
       <SubSystem>
       </SubSystem>
       <GenerateDebugInformation>true</GenerateDebugInformation>
-      <AdditionalDependencies>ws2_32.lib;d3d12.lib;dxgi.lib;dxguid.lib;$(CoreLibraryDependencies);%(AdditionalDependencies)</AdditionalDependencies>
+      <AdditionalDependencies>ws2_32.lib;dxgi.lib;dxguid.lib;$(CoreLibraryDependencies);%(AdditionalDependencies)</AdditionalDependencies>
     </Link>
     <Lib>
       <AdditionalDependencies>
@@ -112,6 +112,7 @@
     <ClInclude Include="include\Core\Common\NonNullPtr.h" />
     <ClInclude Include="include\Core\Common\Singleton.h" />
     <ClInclude Include="include\Core\Container\Vector.h" />
+    <ClInclude Include="include\Core\DynLib\DynamicLibrary.h" />
     <ClInclude Include="include\Core\HAL\Display\Display.h" />
     <ClInclude Include="include\Core\HAL\Event\SystemEvent.h" />
     <ClInclude Include="include\Core\HAL\Keyboard\Keyboard.h" />
@@ -155,6 +156,60 @@
   <ItemGroup>
     <ClCompile Include="src\Core\Application\ApplicationManager.cpp" />
     <ClCompile Include="src\Core\Common\CoreUtils.cpp" />
+    <ClCompile Include="src\Core\DynLib\Win32\DynamicLibrary.cpp">
+      <RuntimeLibrary>MultiThreadedDebugDll</RuntimeLibrary>
+      <Optimization>Disabled</Optimization>
+      <SupportJustMyCode>true</SupportJustMyCode>
+      <AssemblerOutput>NoListing</AssemblerOutput>
+      <AssemblerListingLocation>W:\Classified\Juliet\Intermediate\Juliet\x64\Debug\</AssemblerListingLocation>
+      <UndefineAllPreprocessorDefinitions>false</UndefineAllPreprocessorDefinitions>
+      <BrowseInformationFile>W:\Classified\Juliet\Intermediate\Juliet\x64\Debug\</BrowseInformationFile>
+      <CompileAs>Default</CompileAs>
+      <ConformanceMode>Default</ConformanceMode>
+      <DiagnosticsFormat>Column</DiagnosticsFormat>
+      <ExceptionHandling>false</ExceptionHandling>
+      <EnableASAN>false</EnableASAN>
+      <EnableFiberSafeOptimizations>false</EnableFiberSafeOptimizations>
+      <EnableEnhancedInstructionSet>NotSet</EnableEnhancedInstructionSet>
+      <FloatingPointModel>Fast</FloatingPointModel>
+      <InlineFunctionExpansion>Default</InlineFunctionExpansion>
+      <IntrinsicFunctions>false</IntrinsicFunctions>
+      <LanguageStandard>stdcpp20</LanguageStandard>
+      <LanguageStandard_C>Default</LanguageStandard_C>
+      <ModuleDependenciesFile>W:\Classified\Juliet\Intermediate\Juliet\x64\Debug\</ModuleDependenciesFile>
+      <OmitDefaultLibName>false</OmitDefaultLibName>
+      <FavorSizeOrSpeed>Neither</FavorSizeOrSpeed>
+      <ObjectFileName>W:\Classified\Juliet\Intermediate\Juliet\x64\Debug\</ObjectFileName>
+      <CallingConvention>Cdecl</CallingConvention>
+      <PrecompiledHeader>Use</PrecompiledHeader>
+      <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
+      <PrecompiledHeaderOutputFile>W:\Classified\Juliet\Intermediate\Juliet\x64\Debug\Juliet.pch</PrecompiledHeaderOutputFile>
+      <PreprocessToFile>false</PreprocessToFile>
+      <PreprocessKeepComments>false</PreprocessKeepComments>
+      <PreprocessSuppressLineNumbers>false</PreprocessSuppressLineNumbers>
+      <ScanSourceForModuleDependencies>false</ScanSourceForModuleDependencies>
+      <ShowIncludes>false</ShowIncludes>
+      <SourceDependenciesFile>W:\Classified\Juliet\Intermediate\Juliet\x64\Debug\</SourceDependenciesFile>
+      <SuppressStartupBanner>true</SuppressStartupBanner>
+      <BufferSecurityCheck>true</BufferSecurityCheck>
+      <SmallerTypeCheck>false</SmallerTypeCheck>
+      <StructMemberAlignment>Default</StructMemberAlignment>
+      <TrackerLogDirectory>W:\Classified\Juliet\Intermediate\Juliet\x64\Debug\Juliet.tlog\</TrackerLogDirectory>
+      <MinimalRebuildFromTracking>true</MinimalRebuildFromTracking>
+      <TreatWarningAsError>false</TreatWarningAsError>
+      <WarningLevel>Level3</WarningLevel>
+      <XMLDocumentationFileName>W:\Classified\Juliet\Intermediate\Juliet\x64\Debug\</XMLDocumentationFileName>
+      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
+      <IntelJCCErratum>false</IntelJCCErratum>
+      <BuildStlModules>false</BuildStlModules>
+      <TreatExternalTemplatesAsInternal>true</TreatExternalTemplatesAsInternal>
+      <PreprocessorDefinitions>_DEBUG;JULIET_EXPORT;JULIET_WIN32;_WINDLL;_UNICODE;UNICODE;</PreprocessorDefinitions>
+      <RuntimeTypeInfo>false</RuntimeTypeInfo>
+      <LinkCompiled>true</LinkCompiled>
+      <ClangClMode>true</ClangClMode>
+      <MSCVersion>Default</MSCVersion>
+      <AdditionalOptions>--target=amd64-pc-windows-msvc  </AdditionalOptions>
+    </ClCompile>
     <ClCompile Include="src\Core\HAL\Display\Display.cpp" />
     <ClCompile Include="src\Core\HAL\Display\Win32\Win32DisplayDevice.cpp" />
     <ClCompile Include="src\Core\HAL\Display\Win32\Win32DisplayEvent.cpp" />
diff --git a/Juliet/include/Core/DynLib/DynamicLibrary.h b/Juliet/include/Core/DynLib/DynamicLibrary.h
new file mode 100644
index 0000000..aeeb0df
--- /dev/null
+++ b/Juliet/include/Core/DynLib/DynamicLibrary.h
@@ -0,0 +1,14 @@
+#pragma once
+
+#include <core/Common/NonNullPtr.h>
+
+namespace Juliet
+{
+    struct DynamicLibrary
+    {
+    };
+
+    extern JULIET_API DynamicLibrary* LoadDynamicLibrary(const char* filename);
+    extern JULIET_API FunctionPtr     LoadFunction(NonNullPtr<DynamicLibrary> lib, const char* functionName);
+    extern JULIET_API void UnloadDynamicLibrary(NonNullPtr<DynamicLibrary> lib);
+} // namespace Juliet
diff --git a/Juliet/src/Core/DynLib/Win32/DynamicLibrary.cpp b/Juliet/src/Core/DynLib/Win32/DynamicLibrary.cpp
new file mode 100644
index 0000000..9367bfd
--- /dev/null
+++ b/Juliet/src/Core/DynLib/Win32/DynamicLibrary.cpp
@@ -0,0 +1,75 @@
+#include <pch.h>
+
+#include <Core/DynLib/DynamicLibrary.h>
+#include <Core/HAL/Win32.h>
+
+namespace Juliet
+{
+    namespace
+    {
+        // TODO : Move into string file
+        // Use portable code + pass the memory array into parameter and not use new
+        // This is from http://www.rohitab.com/discuss/topic/41257-char-to-lpcwstr/
+        wchar_t* UTF8ToWideChar(const char* utf8)
+        {
+            wchar_t* w;
+
+            int len = MultiByteToWideChar(CP_UTF8, 0, utf8, -1, 0, 0);
+            if (len <= 0)
+            {
+                return nullptr;
+            }
+
+            w = new wchar_t[len];
+
+            if (!w)
+            {
+                return nullptr;
+            }
+
+            if (MultiByteToWideChar(CP_UTF8, 0, utf8, -1, w, len) <= 0)
+            {
+                delete[] w;
+                return nullptr;
+            }
+
+            return w;
+        }
+    } // namespace
+
+    DynamicLibrary* LoadDynamicLibrary(const char* filename)
+    {
+        if (!filename)
+        {
+            Log(LogLevel::Error, LogCategory::Core, "Library filename is invalid (empty)");
+            return nullptr;
+        }
+
+        LPWSTR  wstr   = UTF8ToWideChar(filename);
+        HMODULE handle = LoadLibraryW(wstr);
+        delete[] wstr;
+
+        // Generate an error message if all loads failed
+        if (!handle)
+        {
+            Log(LogLevel::Error, LogCategory::Core, "Failed loading %s", filename);
+            return nullptr;
+        }
+        return reinterpret_cast<DynamicLibrary*>(handle);
+    }
+
+    FunctionPtr LoadFunction(NonNullPtr<DynamicLibrary> lib, const char* functionName)
+    {
+        auto function = (FunctionPtr)GetProcAddress(reinterpret_cast<HMODULE>(lib.Get()), functionName);
+        if (!function)
+        {
+            Log(LogLevel::Error, LogCategory::Core, "Failed loading %s", functionName);
+        }
+        return function;
+    }
+
+    void UnloadDynamicLibrary(NonNullPtr<DynamicLibrary> lib)
+    {
+        FreeLibrary(reinterpret_cast<HMODULE>(lib.Get()));
+    }
+} // namespace Juliet