fix render layer guid linking w/out font provider layer; eliminate generation number on render handles; sketch out tester scratch program for text drawing performance

src/scratch/textperf.c

@@ -0,0 +1,84 @@
+// Copyright (c) 2024 Epic Games Tools
+// Licensed under the MIT license (https://opensource.org/license/mit/)
+
+////////////////////////////////
+//~ rjf: Build Options
+
+#define BUILD_TITLE "textperf"
+#define OS_FEATURE_GRAPHICAL 1
+
+////////////////////////////////
+//~ rjf: Includes
+
+//- rjf: [h]
+#include "base/base_inc.h"
+#include "os/os_inc.h"
+#include "render/render_inc.h"
+#include "font_provider/font_provider_inc.h"
+#include "font_cache/font_cache.h"
+#include "draw/draw.h"
+
+//- rjf: [c]
+#include "base/base_inc.c"
+#include "os/os_inc.c"
+#include "render/render_inc.c"
+#include "font_provider/font_provider_inc.c"
+#include "font_cache/font_cache.c"
+#include "draw/draw.c"
+
+////////////////////////////////
+//~ rjf: Globals
+
+global OS_Handle os_window = {0};
+global R_Handle r_window = {0};
+
+////////////////////////////////
+//~ rjf: Entry Points
+
+internal B32
+frame(void)
+{
+  ProfBeginFunction();
+  B32 quit = 0;
+  Temp scratch = scratch_begin(0, 0);
+  OS_EventList events = os_get_events(scratch.arena, 0);
+  for(OS_Event *evt = events.first; evt != 0; evt = evt->next)
+  {
+    if(evt->kind == OS_EventKind_WindowClose)
+    {
+      quit = 1;
+      break;
+    }
+  }
+  r_begin_frame();
+  dr_begin_frame();
+  r_window_begin_frame(os_window, r_window);
+  DR_Bucket *bucket = dr_bucket_make();
+  DR_BucketScope(bucket) ProfScope("draw")
+  {
+    Vec2F32 mouse = os_mouse_from_window(os_window);
+    FNT_Tag font = fnt_tag_from_path(str8_lit("C:/devel/raddebugger/data/Inconsolata-Regular.ttf"));
+    for(F32 x = 0; x < 500; x += 5.f)
+    {
+      for(F32 y = 0; y < 500; y += 5.f)
+      {
+        dr_text(font, 16.f, 0, 0, FNT_RasterFlag_Smooth|FNT_RasterFlag_Hinted, v2f32(30 + x + mouse.x, 30 + y + mouse.y), v4f32(1, 1, 1, 1), str8_lit("This is a test."));
+      }
+    }
+  }
+  r_window_submit(os_window, r_window, &bucket->passes);
+  r_window_end_frame(os_window, r_window);
+  r_end_frame();
+  scratch_end(scratch);
+  ProfEnd();
+  return quit;
+}
+
+internal void
+entry_point(CmdLine *cmdline)
+{
+  os_window = os_window_open(v2f32(1600, 900), 0, str8_lit("textperf"));
+  r_window = r_window_equip(os_window);
+  os_window_first_paint(os_window);
+  for(;!update(););
+}