add tracy memory tracking to SDL

src/main.cpp

@@ -626,7 +626,44 @@ V2 get_floor_intersection_of_mouse(V2 mouse_pos) {
     return floor_intersection.xy;
 }
 
+#ifdef TRACY_ENABLE
+SDL_malloc_func  sdl_malloc  = NULL;
+SDL_calloc_func  sdl_calloc  = NULL;
+SDL_realloc_func sdl_realloc = NULL;
+SDL_free_func    sdl_free    = NULL;
+
+void setup_memory_functions() {
+    SDL_GetMemoryFunctions(&sdl_malloc, &sdl_calloc, &sdl_realloc, &sdl_free);
+    SDL_SetMemoryFunctions(
+        [](size_t size) -> void * {
+            void *result = sdl_malloc(size);
+            TracyAllocN(result, size, "SDL");
+            return result;
+        },
+        [](size_t nmemb, size_t size) -> void * {
+            void *result = sdl_calloc(nmemb, size);
+            TracyAllocN(result, nmemb * size, "SDL");
+            return result;
+        },
+        [](void *mem, size_t size) -> void * {
+            void *result = sdl_realloc(mem, size);
+            TracyFreeN(mem, "SDL");
+            TracyAllocN(result, size, "SDL");
+            return result;
+        },
+        [](void *mem) {
+            TracyFreeN(mem, "SDL");
+            sdl_free(mem);
+        }
+    );
+}
+#else
+void setup_memory_functions() {}
+#endif
+
 int main(int argc, char **argv) {
+    setup_memory_functions();
+
     load_map();
 
     #ifdef SDL_PLATFORM_LINUX