Platform ability to query system (logical) cores

src/DTRenderer.cpp

@@ -997,7 +997,7 @@ extern "C" void DTR_Update(PlatformRenderBuffer *const platformRenderBuffer,
 			DTRDebug_EndCycleCount(DTRDebugCycleCount_DTR_Update_RenderPrimitiveTriangles);
 		}
 
-		if (1)
+		if (0)
 		{
 			LOCAL_PERSIST bool runTinyRendererOnce = false;
 			if (1 && runTinyRendererOnce)

src/Win32DTRenderer.cpp

@@ -441,9 +441,15 @@ i32 Win32GetModuleDirectory(char *const buf, const u32 bufLen)
 	return lastSlashIndex;
 }
 
-int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
+DWORD WINAPI Win32ThreadCallback(void *lpParameter)
-                    LPWSTR lpCmdLine, int nShowCmd)
 {
+	OutputDebugString("Threaded Hello World!\n");
+	return 0;
+}
+
+int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPWSTR lpCmdLine, int nShowCmd)
+{
+
 	////////////////////////////////////////////////////////////////////////////
 	// Initialise Win32 Window
 	////////////////////////////////////////////////////////////////////////////
@@ -563,6 +569,78 @@ int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
 	platformInput.flags.canUseSSE2  = IsProcessorFeaturePresent(PF_XMMI64_INSTRUCTIONS_AVAILABLE);
 	platformInput.flags.canUseRdtsc = IsProcessorFeaturePresent(PF_RDTSC_INSTRUCTION_AVAILABLE);
 
+	// Threading
+	{
+		const i32 USE_DEFAULT_STACK_SIZE = 0;
+		void *threadParam                = NULL;
+		DWORD threadId;
+
+		HANDLE threadHandle = CreateThread(NULL, USE_DEFAULT_STACK_SIZE, Win32ThreadCallback,
+		                                   threadParam, 0, &threadId);
+
+		////////////////////////////////////////////////////////////////////////
+		// Query CPU Cores
+		////////////////////////////////////////////////////////////////////////
+		i32 numCores        = 1;
+		i32 numLogicalCores = 0;
+
+		SYSTEM_INFO systemInfo;
+		GetNativeSystemInfo(&systemInfo);
+		DqnWin32_OutputDebugString("Number of Logical Processors: %d\n",
+		                           systemInfo.dwNumberOfProcessors);
+		numLogicalCores = systemInfo.dwNumberOfProcessors;
+
+		DWORD logicalProcInfoRequiredSize = 0;
+		u8 insufficientBuffer             = {};
+		GetLogicalProcessorInformationEx(
+		    RelationProcessorCore, (SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX *)insufficientBuffer,
+		    &logicalProcInfoRequiredSize);
+
+		u8 *rawProcInfoArray =
+		    (u8 *)DqnMemStack_Push(&globalPlatformMemory.tempStack, logicalProcInfoRequiredSize);
+
+		if (rawProcInfoArray)
+		{
+			if (GetLogicalProcessorInformationEx(
+			        RelationProcessorCore,
+			        (SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX *)rawProcInfoArray,
+			        &logicalProcInfoRequiredSize))
+			{
+				SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX *logicalProcInfo =
+				    (SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX *)rawProcInfoArray;
+				DWORD bytesRead = 0;
+
+				do
+				{
+					// NOTE: High efficiency value has greater performance and less efficiency.
+					PROCESSOR_RELATIONSHIP *procInfo = &logicalProcInfo->Processor;
+					u32 efficiency                   = procInfo->EfficiencyClass;
+					DqnWin32_OutputDebugString("Core %d: Efficiency: %d\n", numCores++, efficiency);
+
+					DQN_ASSERT(logicalProcInfo->Relationship == RelationProcessorCore);
+					DQN_ASSERT(procInfo->GroupCount == 1);
+
+					bytesRead += logicalProcInfo->Size;
+					logicalProcInfo =
+					    (SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX *)((u8 *)logicalProcInfo +
+					                                                logicalProcInfo->Size);
+
+				} while (bytesRead < logicalProcInfoRequiredSize);
+			}
+			else
+			{
+				DqnWin32_DisplayLastError("GetLogicalProcessorInformationEx() failed");
+			}
+		}
+		else
+		{
+			DQN_WIN32_ERROR_BOX("DqnMemStack_Push() failed", NULL);
+		}
+
+		DqnMemStack_Pop(&globalPlatformMemory.tempStack, rawProcInfoArray,
+		                logicalProcInfoRequiredSize);
+	}
+
 	////////////////////////////////////////////////////////////////////////////
 	// Update Loop
 	////////////////////////////////////////////////////////////////////////////

src/build.bat

@@ -39,7 +39,7 @@ REM wd4100 unused argument parameters
 REM wd4201 nonstandard extension used: nameless struct/union
 REM wd4189 local variable is initialised but not referenced
 REM wd4505 unreferenced local function not used will be removed
-set CompileFlags=-EHsc -GR- -Oi -MT -Z7 -W4 -wd4100 -wd4201 -wd4189 -wd4505 -O2 -FAsc /I..\src\external\
+set CompileFlags=-EHsc -GR- -Oi -MT -Z7 -W4 -wd4100 -wd4201 -wd4189 -wd4505 -Od -FAsc /I..\src\external\
 set DLLFlags=/Fm%ProjectName% /Fo%ProjectName% /Fa%ProjectName% /Fe%ProjectName%
 set Win32Flags=/FmWin32DTRenderer /FeWin32DTRenderer
 

src/dqn.h

@@ -796,6 +796,8 @@ DQN_FILE_SCOPE void DqnWin32_GetClientDim    (const HWND window, LONG *width, LO
 DQN_FILE_SCOPE void DqnWin32_GetRectDim      (RECT rect, LONG *width, LONG *height);
 DQN_FILE_SCOPE void DqnWin32_DisplayLastError(const char *const errorPrefix);
 DQN_FILE_SCOPE void DqnWin32_DisplayErrorCode(const DWORD error, const char *const errorPrefix);
+DQN_FILE_SCOPE void DqnWin32_OutputDebugString(const char *const formatStr, ...);
+
 #endif /* DQN_WIN32_IMPLEMENTATION */
 
 
@@ -3270,6 +3272,21 @@ DQN_FILE_SCOPE void DqnWin32_DisplayErrorCode(const DWORD error, const char *con
 	Dqn_sprintf(formattedError, "%s: %s", errorPrefix, errorMsg);
 	DQN_WIN32_ERROR_BOX(formattedError, NULL);
 }
+
+DQN_FILE_SCOPE void DqnWin32_OutputDebugString(const char *const formatStr, ...)
+{
+	LOCAL_PERSIST char str[1024] = {};
+
+	va_list argList;
+	va_start(argList, formatStr);
+	{
+		i32 numCopied = Dqn_vsprintf(str, formatStr, argList);
+		DQN_ASSERT(numCopied < DQN_ARRAY_COUNT(str));
+	}
+	va_end(argList);
+
+	OutputDebugString(str);
+}
 #endif // DQN_WIN32_PLATFROM
 
 FILE_SCOPE bool DqnFile_OpenInternal(const wchar_t *const path,