print mem used

imgui.ini

@@ -8,7 +8,7 @@ Size=1152,1414
 
 [Window][main]
 Pos=0,0
-Size=1777,680
+Size=1183,680
 
 [Window][Hex View]
 Pos=91,62

src/mem.cpp

@@ -1,7 +1,6 @@
 // Mostly taken from the raddebugger -- thanks, Ryan.
 
 #define align_pow2(x, b) (((x) + (b) - 1) & ( ~((b) - 1)))
-#define SLLStackPush_N(f,n,next) ((n)->next=(f), (f)=(n))
 #define SLLStackPop_N(f,next) ((f)=(f)->next)
 
 #ifdef ENABLE_ASAN
@@ -60,6 +59,16 @@ void arena_release(Arena *arena)
   }
 }
 
+internal u64
+arena_mem_used(Arena *arena)
+{
+  u64 tot = 0;
+  for (Arena *node = arena->cur, *prev = 0; node; node = prev) {
+    tot += node->pos - node->base_pos;
+  }
+  return tot;
+}
+
 internal
 u64 arena_huge_push_threshold()
 {
@@ -86,7 +95,8 @@ void *arena_push_impl(Arena *arena, u64 size)
 
     if (new_block) {
       new_block->base_pos = cur->base_pos + cur->res;
-      SLLStackPush_N(arena->cur, new_block, prev);
+      new_block->prev = arena->cur;
+      arena->cur = new_block;
 
       cur = new_block;
       pos_mem = align_pow2(cur->pos, cur->align);

src/render.cpp

@@ -21,6 +21,15 @@ f32 calc_avg_dt_ms(const Delta_Time_Accum &accum)
 	return res;
 }
 
+internal
+String8 to_pretty_size(Arena *arena, u64 bytes)
+{
+	if (bytes >= GiB(1)) return push_str8f(arena, "%.1f GiB", (f32)bytes / GiB(1));
+	if (bytes >= MiB(1)) return push_str8f(arena, "%.1f MiB", (f32)bytes / MiB(1));
+	if (bytes >= KiB(1)) return push_str8f(arena, "%.1f KiB", (f32)bytes / KiB(1));
+	return push_str8f(arena, "%zu B", bytes);
+}
+
 internal
 u32 mem_edit_bg_color_fn(const u8 *data, u64 off, const void *user_data)
 {
@@ -84,19 +93,22 @@ void update_and_render(Arena *arena, App_State &app, f32 delta_time_ms)
     String8 ntpl_desc = rntuple_description(scratch.arena, app.rntinfo.anchor);
     ImGui::Text("Inspecting RNTuple '%s' (%s)", app.ntpl_name, ntpl_desc.c());
 
-    // Draw avg delta time
+    // Draw stats
     {
       ImGui::SameLine();
 
+      u64 mem_used = arena_mem_used(arena);
       f32 avg_dt = calc_avg_dt_ms(app.delta_time_accum);
-      String8 dt_txt = push_str8f(scratch.arena, "avg dt: %.1f", avg_dt);
 
-      f32 pos_x = (ImGui::GetCursorPosX() + ImGui::GetColumnWidth() - ImGui::CalcTextSize(dt_txt.c()).x 
+      String8 stat_txt = push_str8f(scratch.arena, "mem used: %s | avg dt: %.1f", 
+                                    to_pretty_size(scratch.arena, mem_used), avg_dt);
+
+      f32 pos_x = (ImGui::GetCursorPosX() + ImGui::GetColumnWidth() - ImGui::CalcTextSize(stat_txt.c()).x 
         - ImGui::GetScrollX() - 2 * ImGui::GetStyle().ItemSpacing.x);
       if (pos_x > ImGui::GetCursorPosX())
         ImGui::SetCursorPosX(pos_x);
 
-      ImGui::Text("%s", dt_txt.c());
+      ImGui::Text("%s", stat_txt.c());
     }
 
     ImGui::Separator();

src/rntviewer.cpp

@@ -61,7 +61,6 @@ void app_cleanup(App_State &app)
   os_stop_file_watch(app);
   os_unmap_file(app.inspected_fmem, app.inspected_file_size);
   if (app.inspected_file) fclose(app.inspected_file); 
-  app.inspected_file = nullptr;
 }
 
 int main(int argc, char **argv)

src/types.h

@@ -18,3 +18,7 @@ using i64 = int64_t;
 
 #define max(a, b) ((a) > (b)) ? (a) : (b)
 #define min(a, b) ((a) < (b)) ? (a) : (b)
+
+#define KiB(b) (b * 1024)
+#define MiB(b) (KiB(b) * 1024)
+#define GiB(b) (MiB(b) * 1024)