refactor: world generation (#17)

* refactor: use TBB for concurrent hash maps and parallelize chunk processing

* fix: tbb link fail

* refactor(chunk): remove biome check for caves in rivers and oceans

* refactor(random): replace std distributions with custom implementations

Avoid overhead and platform-dependent behavior of `<random>` distributions by using direct engine operations and integer arithmetic. This ensures deterministic, cross-platform results and improves performance.

* refactor(generation): use chunk seed for cave and river paths

- Use per-chunk seed instead of global path_id for cave and river generation.
- Remove unused m_sum variables and m_path_id members.
- Clamp river yaw within 10 degrees of initial direction.
- Fix river radius interpolation (use t instead of 1-t).
- Lower sea level from 64 to 63.

CMakeLists.txt

@@ -58,6 +58,21 @@ if (WIN32)
     if(TARGET freetype)
     add_library(Freetype::Freetype ALIAS freetype)
     endif()
+    set(_BUILD_SHARED_LIBS_SAVED ${BUILD_SHARED_LIBS})
+    set(BUILD_SHARED_LIBS ON)
+
+    FetchContent_Declare(
+    onetbb                           
+    GIT_REPOSITORY https://github.com/uxlfoundation/oneTBB.git
+    GIT_TAG v2023.0.0
+    )
+    set(BUILD_TESTING OFF CACHE BOOL "Build tests" FORCE)
+    set(TBB_TEST OFF CACHE BOOL "Build TBB tests" FORCE)
+    FetchContent_MakeAvailable(onetbb)
+
+    set(BUILD_SHARED_LIBS ${_BUILD_SHARED_LIBS_SAVED})
+    unset(_BUILD_SHARED_LIBS_SAVED)
+
 endif()
 
 FetchContent_Declare(
@@ -83,7 +98,6 @@ FetchContent_MakeAvailable(tomlplusplus)
 
 add_subdirectory(third_party/imgui)
 
-
 set(INCLUDE_DIR ${PROJECT_SOURCE_DIR}/include)
 
 add_executable(${PROJECT_NAME}
@@ -164,10 +178,11 @@ target_link_libraries(${PROJECT_NAME}
         Freetype::Freetype
         tomlplusplus::tomlplusplus
         imgui
+        tbb
 )
 
 if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU" OR CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
-    target_link_libraries(${PROJECT_NAME} PRIVATE tbb)
+#    target_link_libraries(${PROJECT_NAME} PRIVATE tbb)
 endif()
 
 if (UNIX AND NOT APPLE)
@@ -187,3 +202,19 @@ if (UNIX AND NOT APPLE)
 
     target_compile_options(${PROJECT_NAME} PRIVATE ${EGL_CFLAGS_OTHER} ${Wayland_CFLAGS_OTHER})
 endif()
+
+if (WIN32)
+    foreach(TBB_LIB IN ITEMS tbb tbbmalloc tbbmalloc_proxy)
+        if(TARGET ${TBB_LIB})
+            add_custom_command(
+                TARGET ${PROJECT_NAME} POST_BUILD
+                COMMAND ${CMAKE_COMMAND} -E copy_if_different
+                    $<TARGET_FILE:${TBB_LIB}>
+                    $<TARGET_FILE_DIR:${PROJECT_NAME}>
+                COMMENT "Copying ${TBB_LIB}.dll"
+            )
+        else()
+            message(STATUS "Target ${TBB_LIB} not found, skipping copy")
+        endif()
+    endforeach()
+endif()