sync: Remove streflop library and all associated dead code

streflop is no longer needed: the four atan2 calls that affected
sync-logged game state now use deterministicAtan2Deg() (previous
commit), and the remaining streflop uses (fabs, floor, sqrt) are
inherently deterministic under IEEE 754.

Source file cleanup
-------------------
Every #ifdef USE_STREFLOP / streflop:: / #else / stdlib / #endif block
is collapsed to the stdlib branch:

  unit_updater.cpp   - floor() for range checks
  map_preview.cpp    - sqrtf() distance, fabs() gradient
  particle.cpp       - fabsf/sinf/cosf/sqrtf/fmod/cos/sin/atan2
                       (all rendering-only, no sync impact)
  vec.h              - std::sqrt() in Vec2/Vec3::length()
  main.cpp           - remove STREFLOP mode/enabled log prints
  math_wrapper.h     - unconditional #include <cmath>

lua_script.cpp: remove Lua_STREFLOP_Wrapper class and all ~25
instances. The class toggled streflop precision around Lua calls to
avoid FPU state corruption; with streflop gone it is a no-op.

platform_main.h
---------------
  - Remove --disable-streflop-checks CLI arg and GAME_ARG enum value
  - Remove the SSE capability runtime check (was only needed to
    validate streflop's SSE mode requirement)
  - Remove streflop_init<streflop::Simple>() startup call

CMakeLists.txt
--------------
  - Remove WANT_USE_STREFLOP and FORCE_STREFLOP_SOFTWRAPPER options
  - Remove the STREFLOP_SSE/X87/SOFT detection and ADD_DEFINITIONS block

source/shared_lib/CMakeLists.txt
---------------------------------
  - Remove pkg_search_module(STREFLOP …) discovery
  - Remove ADD_SUBDIRECTORY(sources/streflop) and link step
  - Remove ${STREFLOP_PROPERTIES} from compile flags
  - Remove ${MG_STREFLOP} from Windows link libraries

Deleted files
-------------
  source/shared_lib/sources/streflop/         (~70 .cpp files)
  source/shared_lib/include/streflop/         (~20 .h files)
  source/shared_lib/include/platform/common/streflop_cond.h
  source/tests/shared_lib/streflop/           (OOS regression test)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: andy5995

CMakeLists.txt

@@ -100,7 +100,6 @@ OPTION(WANT_STATIC_LIBS "Builds as many static libs as possible." OFF)
 OPTION(WANT_USE_OpenSSL "Use libOpenSSL during CURL linking." ON)
 OPTION(WANT_USE_FriBiDi "Enable libFriBIDi support." ON)
 OPTION(WANT_USE_GoogleBreakpad "Enable GoogleBreakpad support." ON)
-OPTION(WANT_USE_STREFLOP "Use the library streflop." OFF)
 OPTION(WANT_USE_XercesC "Enable libXercesC support." OFF)
 
 FIND_PROGRAM(HELP2MAN "help2man")
@@ -263,39 +262,6 @@ endforeach()
 	#SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall")
     #MESSAGE(STATUS "*TEST: Checking for max SSE LEVEL [${FORCE_MAX_SSE_LEVEL}]")
 
-	OPTION(FORCE_STREFLOP_SOFTWRAPPER "Set the streflop library to be forced to use the software emulator" OFF)
-    IF(NOT FORCE_MAX_SSE_LEVEL AND NOT FORCE_STREFLOP_SOFTWRAPPER)
-        SET(FORCE_MAX_SSE_LEVEL "1" CACHE STRING "Set the max SSE level to use if supported (0-3)")
-    ENDIF()
-
-    IF(NOT FORCE_STREFLOP_SOFTWRAPPER)
-        MESSAGE(STATUS "*NOTE: Checking for max SSE LEVEL [${FORCE_MAX_SSE_LEVEL}]")
-        special_check_for_sse( ${FORCE_MAX_SSE_LEVEL} )
-    ENDIF()
-
-	IF(WANT_USE_STREFLOP)
-		ADD_DEFINITIONS("-DUSE_STREFLOP -DSTREFLOP_RANDOM_GEN_SIZE=32 -DLIBM_COMPILING_FLT32 -DN_SPECIALIZED=32")
-
-        IF(HAS_SSE_EXTENSIONS AND NOT ${FORCE_MAX_SSE_LEVEL} MATCHES "0" AND NOT FORCE_STREFLOP_SOFTWRAPPER)
-            ADD_DEFINITIONS("-DSTREFLOP_SSE")
-            MESSAGE(STATUS "*NOTE: using SSE for STREFLOP.")
-        ELSE()
-            IF(NOT FORCE_STREFLOP_SOFTWRAPPER)
-                special_check_for_x87()
-            ENDIF()
-
-            IF(HAS_X87_SUPPORT AND NOT FORCE_STREFLOP_SOFTWRAPPER)
-                ADD_DEFINITIONS("-DSTREFLOP_X87")
-                MESSAGE(STATUS "*NOTE: using X87 for STREFLOP.")
-            ELSE()
-                ADD_DEFINITIONS("-DSTREFLOP_SOFT")
-                MESSAGE(STATUS "*NOTE: using SOFT emulation for STREFLOP.")
-            ENDIF()
-        ENDIF()
-	ELSE()
-		MESSAGE(STATUS "*NOTE: STREFLOP disabled. atan2 calls that feed into sync state use deterministicAtan2Deg() instead.")
-	ENDIF()
-
 	include(CheckCXXSourceRuns)
 
 	check_cxx_source_runs("

source/glest_game/main/main.cpp

@@ -4364,29 +4364,7 @@ int glestMain(int argc, char **argv) {
 
         printf("\nGIT: [%s]", getGITRevisionString().c_str());
 
-#ifdef USE_STREFLOP
-
-#if defined(STREFLOP_SSE)
-        const char *instruction_set = "[SSE]";
-#elif defined(STREFLOP_X87)
-        const char *instruction_set = "[X87]";
-#elif defined(STREFLOP_SOFT)
-        const char *instruction_set = "[SOFTFLOAT]";
-#else
-        const char *instruction_set = "[none]";
-#endif
-
-#if defined(STREFLOP_NO_DENORMALS)
-        const char *denormals = "[no-denormals]";
-#else
-        const char *denormals = "[denormals]";
-#endif
-
-        printf(" - using STREFLOP %s - %s\n", instruction_set, denormals);
-
-#else
         printf("\n");
-#endif
     }
 
     setGameVersion(glestVersionString);
@@ -4923,11 +4901,7 @@ int glestMain(int argc, char **argv) {
         NetworkInterface::setDisplayMessageFunction(ExceptionHandler::DisplayMessage);
         MenuStateMasterserver::setDisplayMessageFunction(ExceptionHandler::DisplayMessage);
 
-#ifdef USE_STREFLOP
-        SystemFlags::OutputDebug(SystemFlags::debugSystem, "%s, STREFLOP enabled.\n", getNetworkVersionString().c_str());
-#else
         SystemFlags::OutputDebug(SystemFlags::debugSystem, "%s, STREFLOP NOT enabled.\n", getNetworkVersionString().c_str());
-#endif
 
         SystemFlags::OutputDebug(SystemFlags::debugSystem, "In [%s::%s Line: %d]\n", __FILE__, __FUNCTION__, __LINE__);
         SystemFlags::OutputDebug(SystemFlags::debugUnitCommands, "START\n");

source/glest_game/world/unit_updater.cpp

@@ -3490,11 +3490,7 @@ vector<Unit *> UnitUpdater::findUnitsInRange(const Unit *unit, int radius) {
     for (int i = center.x - range; i < center.x + range + size; ++i) {
         for (int j = center.y - range; j < center.y + range + size; ++j) {
             // cells inside map and in range
-#ifdef USE_STREFLOP
-            if (map->isInside(i, j) && streflop::floor(static_cast<streflop::Simple>(floatCenter.dist(Vec2f((float)i, (float)j)))) <= (range + 1)) {
-#else
             if (map->isInside(i, j) && floor(floatCenter.dist(Vec2f((float)i, (float)j))) <= (range + 1)) {
-#endif
                 Cell *cell = map->getCell(i, j);
                 findUnitsForCell(cell, units);
             }

source/shared_lib/CMakeLists.txt

@@ -1,47 +1,14 @@
-#########################################################################################
-# streflop
-
 OPTION(FORCE_EMBEDDED_LIBS "Force use of embedded libraries' code." OFF)
 
 # IMPORTANT: should come BEFORE finding packages
 IF(NOT MSVC)
 	find_package(PkgConfig REQUIRED)
 ENDIF()
 
-IF(FORCE_STREFLOP_SOFTWRAPPER)
-    pkg_search_module(STREFLOP streflop-soft)
-ELSE()
-    IF(HAS_SSE_EXTENSIONS AND NOT ${FORCE_MAX_SSE_LEVEL} MATCHES "0")
-        pkg_search_module(STREFLOP streflop-sse)
-    ELSE()
-        IF(HAS_X87_SUPPORT)
-            pkg_search_module(STREFLOP streflop-x87)
-        ELSE()
-            pkg_search_module(STREFLOP streflop-soft)
-        ENDIF()
-    ENDIF()
-ENDIF()
-IF(NOT STREFLOP_FOUND)
-    pkg_search_module(STREFLOP streflop)
-ENDIF()
-MESSAGE(STATUS "Search for Library STREFLOP result = ${STREFLOP_FOUND} libs: ${STREFLOP_LIBRARIES} include dirs: ${STREFLOP_INCLUDE_DIRS}")
-
 IF(FORCE_EMBEDDED_LIBS)
-    SET(STREFLOP_FOUND OFF)
     MESSAGE(STATUS "FORCING USE of EMBEDDED Libraries...")
 ENDIF()
 
-IF(WANT_USE_STREFLOP)
-    IF(NOT STREFLOP_FOUND)
-    	ADD_SUBDIRECTORY(sources/streflop)
-    ELSE()
-        INCLUDE_DIRECTORIES(${STREFLOP_INCLUDE_DIRS} ${STREFLOP_INCLUDE_DIRS}/streflop)
-        SET(EXTERNAL_LIBS ${EXTERNAL_LIBS} ${STREFLOP_LIBRARIES})
-
-		ADD_DEFINITIONS("-DUSE_STREFLOP_PKG")
-    ENDIF()
-ENDIF()
-
 #########################################################################################
 # common libraries
 
@@ -266,14 +233,6 @@ IF(BUILD_MEGAGLEST_MODEL_VIEWER OR BUILD_MEGAGLEST_MAP_EDITOR OR BUILD_MEGAGLEST
 		util
 		xml)
 
-	IF(WANT_USE_STREFLOP AND NOT STREFLOP_FOUND)
-		SET(DIRS_WITH_SRC
-            ${DIRS_WITH_SRC}
-			streflop
-			streflop/libm_flt32_source
-            streflop/softfloat)
-	ENDIF()
-
 	IF(FORCE_EMBEDDED_LIBS)
 		SET(FORCE_USE_EMBEDDED_Miniupnpc ON)
 	ELSE()
@@ -466,7 +425,7 @@ IF(BUILD_MEGAGLEST_MODEL_VIEWER OR BUILD_MEGAGLEST_MAP_EDITOR OR BUILD_MEGAGLEST
 	ENDIF()
 
 	SET_SOURCE_FILES_PROPERTIES(${MG_SOURCE_FILES} PROPERTIES COMPILE_FLAGS
-		"${PLATFORM_SPECIFIC_DEFINES} ${STREFLOP_PROPERTIES} ${CXXFLAGS}")
+		"${PLATFORM_SPECIFIC_DEFINES} ${CXXFLAGS}")
 
 	SET_SOURCE_FILES_PROPERTIES(${MG_INCLUDE_FILES} PROPERTIES HEADER_FILE_ONLY 1)
 
@@ -517,7 +476,6 @@ IF(BUILD_MEGAGLEST_MODEL_VIEWER OR BUILD_MEGAGLEST_MAP_EDITOR OR BUILD_MEGAGLEST
 			TARGET_LINK_LIBRARIES(${TARGET_NAME}
 				${JPEG_LIBRARIES}
 				${LUA_LIBRARIES}
-				${MG_STREFLOP}
 				${COMMON_LIBS}
 				ftgl
 				gdi32
@@ -530,9 +488,6 @@ IF(BUILD_MEGAGLEST_MODEL_VIEWER OR BUILD_MEGAGLEST_MAP_EDITOR OR BUILD_MEGAGLEST
 		ENDIF()
 	ENDIF()
 
-	IF(WANT_USE_STREFLOP AND NOT STREFLOP_FOUND)
-		TARGET_LINK_LIBRARIES(${TARGET_NAME} streflop)
-	ENDIF()
 	TARGET_LINK_LIBRARIES(${TARGET_NAME} ${EXTERNAL_LIBS} ${COMMON_LIBS})
 
 	#IF(MINIUPNP_DEBUG_BUILD)

source/shared_lib/include/graphics/vec.h

@@ -228,12 +228,8 @@ template <typename T> class Vec2 {
     inline bool operator<(const Vec2<T> &v) const { return x < v.x || (x == v.x && y < v.y); }
 
     inline float length() const {
-#ifdef USE_STREFLOP
-        float len = static_cast<float>(streflop::sqrt(static_cast<streflop::Simple>(x * x + y * y)));
-#else
         float len = static_cast<float>(std::sqrt(static_cast<float>(x * x + y * y)));
         len = truncateDecimal<float>(len, 6);
-#endif
         return len;
     }
 
@@ -422,12 +418,8 @@ template <typename T> class Vec3 {
     }
 
     inline float length() const {
-#ifdef USE_STREFLOP
-        float len = static_cast<float>(streflop::sqrt(static_cast<streflop::Simple>(x * x + y * y + z * z)));
-#else
         float len = static_cast<float>(std::sqrt(x * x + y * y + z * z));
         len = truncateDecimal<float>(len, 6);
-#endif
         return len;
     }
 

source/shared_lib/include/platform/common/math_wrapper.h

@@ -12,17 +12,8 @@
 #ifndef _SHARED_PLATFORMCOMMON_MATHWRAPPER_H_
 #define _SHARED_PLATFORMCOMMON_MATHWRAPPER_H_
 
-#ifdef USE_STREFLOP
-
-#include <cmath>
-#include <streflop_cond.h>
-
-#else
-
 #include <cmath>
 
-#endif
-
 #include "leak_dumper.h"
 
 #endif