1 files changed, 84 insertions, 0 deletions
diff --git a/tools/editor/plugins/baked_light_baker_cmpxchg.cpp b/tools/editor/plugins/baked_light_baker_cmpxchg.cpp
new file mode 100644
index 0000000000..d08c9f6484
--- /dev/null
+++ b/tools/editor/plugins/baked_light_baker_cmpxchg.cpp
@@ -0,0 +1,84 @@
+
+#include "typedefs.h"
+
+
+#ifdef WINDOWS_ENABLED
+
+#include "windows.h"
+
+void baked_light_baker_add_64f(double *dst,double value) {
+
+	union {
+		int64_t i;
+		double f;
+	} swapy;
+
+
+	while(true) {
+		swapy.f=*dst;
+		int64_t from = swapy.i;
+		swapy.f+=value;
+		int64_t to=swapy.i;
+		int64_t result = InterlockedCompareExchange64((int64_t*)dst,to,from);
+		if (result==from)
+			break;
+	}
+
+}
+
+void baked_light_baker_add_64i(int64_t *dst,int64_t value) {
+
+	while(true) {
+		int64_t from = *dst;
+		int64_t to = from+value;
+		int64_t result = InterlockedCompareExchange64(dst,to,from);
+		if (result==from)
+			break;
+	}
+}
+
+#elif (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) > 40100
+
+void baked_light_baker_add_64f(double *dst,double value) {
+
+
+	union {
+		int64_t i;
+		double f;
+	} swapy;
+
+
+	while(true) {
+		swapy.f=*dst;
+		int64_t from = swapy.i;
+		swapy.f+=value;
+		int64_t to=swapy.i;
+		if (__sync_bool_compare_and_swap((int64_t*)dst,from,to))
+			break;
+	}
+}
+
+void baked_light_baker_add_64i(int64_t *dst,int64_t value) {
+
+	while(!__sync_bool_compare_and_swap(dst,*dst,(*dst)+value)) {}
+
+}
+
+#else
+
+//in goder (the god of programmers) we trust
+#warning seems this platform or compiler does not support safe cmpxchg, your baked lighting may be funny
+
+void baked_light_baker_add_64f(double *dst,double value) {
+
+	*dst+=value;
+
+}
+
+void baked_light_baker_add_64i(int64_t *dst,int64_t value) {
+
+	*dst+=value;
+
+}
+
+#endif