Add SDL3 and replace Windows semaphores (#4)

* Add SDL3 and replace Windows semaphores

* Try this

* Change for now

.github/workflows/build.yml

@@ -19,6 +19,13 @@ jobs:
         # - { name: 'msys2 clang32',  shell: 'msys2 {0}', msystem: clang32, msys-env: mingw-w64-clang-i686,  clang-tidy: true, werror: true, no-dx5-libs: true }
 
     steps:
+      # Figure out how to build for 32-bit arch
+      # - name: Set up SDL
+      #   id: sdl
+      #   uses: libsdl-org/setup-sdl@main
+      #   with:
+      #     version: sdl3-head
+
       - name: Set up MSYS2
         if: ${{ !!matrix.toolchain.msystem }}
         uses: msys2/setup-msys2@v2
@@ -49,6 +56,7 @@ jobs:
           submodules: true
 
       - name: Build
+        # Add -DDOWNLOAD_DEPENDENCIES=OFF once setup-sdl works
         run: |
           cmake -S . -B build -GNinja \
             -DCMAKE_BUILD_TYPE=Debug \

CMakeLists.txt

@@ -5,6 +5,27 @@ cmake_policy(SET CMP0091 NEW)
 
 project(isle CXX C)
 
+# By configuring CMake with -DDOWNLOAD_DEPENDENCIES=ON/OFF,
+# users can choose between downloading dependencies or using system libraries
+option(DOWNLOAD_DEPENDENCIES "Download dependencies" TRUE)
+
+if(DOWNLOAD_DEPENDENCIES)
+    # FetchContent downloads and configures dependencies
+    include(FetchContent)
+    FetchContent_Declare(
+        SDL3
+        GIT_REPOSITORY "https://github.com/libsdl-org/SDL.git"
+        GIT_TAG "main"
+        EXCLUDE_FROM_ALL
+    )
+    FetchContent_MakeAvailable(SDL3)
+else()
+    # find_package looks for already-installed system packages.
+    # Configure with `-DCMAKE_PREFIX_PATH="/path/to/package1;/path/to/package2"`
+    # to add search paths.
+    find_package(SDL3 CONFIG REQUIRED)
+endif()
+
 include(CheckCXXSourceCompiles)
 include(CMakeDependentOption)
 include(CMakePushCheckState)
@@ -277,7 +298,7 @@ add_library(omni STATIC
 register_lego1_target(omni)
 set_property(TARGET omni PROPERTY ARCHIVE_OUTPUT_NAME "omni$<$<CONFIG:Debug>:d>")
 target_include_directories(omni PRIVATE "${CMAKE_SOURCE_DIR}/LEGO1/omni/include" "${CMAKE_SOURCE_DIR}/LEGO1" "${CMAKE_SOURCE_DIR}/util")
-target_link_libraries(omni PRIVATE dsound winmm libsmacker)
+target_link_libraries(omni PRIVATE dsound winmm libsmacker SDL3::SDL3)
 
 add_library(lego1 SHARED
   LEGO1/define.cpp

LEGO1/omni/include/mxsemaphore.h

@@ -3,7 +3,7 @@
 
 #include "mxtypes.h"
 
-#include <windows.h>
+#include <SDL3/SDL_mutex.h>
 
 // VTABLE: LEGO1 0x100dccf0
 // SIZE 0x08
@@ -12,15 +12,15 @@ public:
 	MxSemaphore();
 
 	// FUNCTION: LEGO1 0x100c87e0
-	~MxSemaphore() { CloseHandle(m_hSemaphore); }
+	~MxSemaphore() { SDL_DestroySemaphore(m_semaphore); }
 
 	virtual MxResult Init(MxU32 p_initialCount, MxU32 p_maxCount);
 
-	void Wait(MxU32 p_timeoutMS);
-	void Release(MxU32 p_releaseCount);
+	void Wait();
+	void Release();
 
 private:
-	HANDLE m_hSemaphore; // 0x04
+	SDL_Semaphore* m_semaphore; // 0x04
 };
 
 #endif // MX_SEMAPHORE_H

LEGO1/omni/src/stream/mxdiskstreamprovider.cpp

@@ -70,7 +70,7 @@ MxDiskStreamProvider::~MxDiskStreamProvider()
 
 	if (m_remainingWork) {
 		m_remainingWork = FALSE;
-		m_busySemaphore.Release(1);
+		m_busySemaphore.Release();
 		m_thread.Terminate();
 	}
 
@@ -164,7 +164,7 @@ void MxDiskStreamProvider::VTable0x20(MxDSAction* p_action)
 MxResult MxDiskStreamProvider::WaitForWorkToComplete()
 {
 	while (m_remainingWork) {
-		m_busySemaphore.Wait(INFINITE);
+		m_busySemaphore.Wait();
 		if (m_unk0x35) {
 			PerformWork();
 		}
@@ -205,7 +205,7 @@ MxResult MxDiskStreamProvider::FUN_100d1780(MxDSStreamingAction* p_action)
 	}
 
 	m_unk0x35 = TRUE;
-	m_busySemaphore.Release(1);
+	m_busySemaphore.Release();
 	return SUCCESS;
 }
 
@@ -222,7 +222,7 @@ void MxDiskStreamProvider::PerformWork()
 
 			if (streamingAction && !FUN_100d1af0(streamingAction)) {
 				m_thread.Sleep(500);
-				m_busySemaphore.Release(1);
+				m_busySemaphore.Release();
 				return;
 			}
 		}

LEGO1/omni/src/system/mxsemaphore.cpp

@@ -8,27 +8,30 @@ DECOMP_SIZE_ASSERT(MxSemaphore, 0x08)
 // FUNCTION: LEGO1 0x100c87d0
 MxSemaphore::MxSemaphore()
 {
-	m_hSemaphore = NULL;
+	m_semaphore = NULL;
 }
 
 // FUNCTION: LEGO1 0x100c8800
 MxResult MxSemaphore::Init(MxU32 p_initialCount, MxU32 p_maxCount)
 {
+	// [library:synchronization] No support for max count, but shouldn't be necessary
 	MxResult result = FAILURE;
-	if ((m_hSemaphore = CreateSemaphoreA(NULL, p_initialCount, p_maxCount, NULL))) {
+	if ((m_semaphore = SDL_CreateSemaphore(p_initialCount))) {
 		result = SUCCESS;
 	}
 	return result;
 }
 
 // FUNCTION: LEGO1 0x100c8830
-void MxSemaphore::Wait(MxU32 p_timeoutMS)
+void MxSemaphore::Wait()
 {
-	WaitForSingleObject(m_hSemaphore, p_timeoutMS);
+	// [library:synchronization] Removed timeout since only INFINITE is ever requested
+	SDL_WaitSemaphore(m_semaphore);
 }
 
 // FUNCTION: LEGO1 0x100c8850
-void MxSemaphore::Release(MxU32 p_releaseCount)
+void MxSemaphore::Release()
 {
-	ReleaseSemaphore(m_hSemaphore, p_releaseCount, NULL);
+	// [library:synchronization] Removed release count since only 1 is ever requested
+	SDL_PostSemaphore(m_semaphore);
 }

LEGO1/omni/src/system/mxthread.cpp

@@ -5,6 +5,7 @@
 #include "mxtimer.h"
 
 #include <process.h>
+#include <windows.h>
 
 DECOMP_SIZE_ASSERT(MxThread, 0x1c)
 DECOMP_SIZE_ASSERT(MxTickleThread, 0x20)
@@ -81,7 +82,7 @@ void MxThread::Sleep(MxS32 p_milliseconds)
 void MxThread::Terminate()
 {
 	m_running = FALSE;
-	m_semaphore.Wait(INFINITE);
+	m_semaphore.Wait();
 }
 
 // FUNCTION: LEGO1 0x100bf680
@@ -93,6 +94,6 @@ unsigned MxThread::ThreadProc(void* p_thread)
 // FUNCTION: LEGO1 0x100bf690
 MxResult MxThread::Run()
 {
-	m_semaphore.Release(1);
+	m_semaphore.Release();
 	return SUCCESS;
 }