sketch out logging stub, to begin marking up debugger layers with logging - high level stuff still wip

src/base/base_log.c

@@ -0,0 +1,72 @@
+// Copyright (c) 2024 Epic Games Tools
+// Licensed under the MIT license (https://opensource.org/license/mit/)
+
+////////////////////////////////
+//~ rjf: Globals/Thread-Locals
+
+C_LINKAGE thread_static Log *log_active;
+#if !BUILD_SUPPLEMENTARY_UNIT
+C_LINKAGE thread_static Log *log_active = 0;
+#endif
+
+////////////////////////////////
+//~ rjf: Log Creation/Selection
+
+internal Log *
+log_alloc(void)
+{
+  Arena *arena = arena_alloc();
+  Log *log = push_array(arena, Log, 1);
+  log->arena = arena;
+  log->log_buffer_start_pos = arena_pos(arena);
+  return log;
+}
+
+internal void
+log_release(Log *log)
+{
+  arena_release(log->arena);
+}
+
+internal void
+log_select(Log *log)
+{
+  log_active = log;
+}
+
+////////////////////////////////
+//~ rjf: Log Building/Clearing
+
+internal void
+log_msg(String8 string)
+{
+  if(log_active != 0)
+  {
+    str8_list_push(log_active->arena, &log_active->log_buffer_strings, string);
+  }
+}
+
+internal void
+log_msgf(char *fmt, ...)
+{
+  if(log_active != 0)
+  {
+    Temp scratch = scratch_begin(0, 0);
+    va_list args;
+    va_start(args, fmt);
+    String8 string = push_str8fv(scratch.arena, fmt, args);
+    log_msg(string);
+    va_end(args);
+    scratch_end(scratch);
+  }
+}
+
+internal void
+log_clear(void)
+{
+  if(log_active != 0)
+  {
+    arena_pop_to(log_active->arena, log_active->log_buffer_start_pos);
+    MemoryZeroStruct(&log_active->log_buffer_strings);
+  }
+}