Sprinter/mame
2
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Hi,

Browse Source 
compared to other emulator (i.e. kawak), mame does not perform very well in
terms of speed of emulation against Neo Geo games.

Looking at profiling data for these neo geo games, we can see :
---------------------------------------------------------
  %   cumulative   self              self     total
 time   seconds   seconds    calls   s/call   s/call  name
 18.40     18.80    18.80   971070     0.00     0.00  video_update_neogeo
 10.42     29.45    10.65     4416     0.00     0.00  texture_set_data
 10.06     39.73    10.28  1144463     0.00     0.00
sprite_line_timer_callback
  6.24     46.10     6.37 187970965     0.00     0.00  astring_cmpc
  3.77     49.95     3.85 35732143     0.00     0.00  memory_region
---------------------------------------------------------

I was wondering why functions like 'astring_cmpc' and 'memory_region' where
in the top 5 of the most time consuming functions.

The answer is found in the function 'draw_sprites' from
'mame/video/neogeo.c' where 'memory_region' is called for each sprites for
each VIDEO_UPDATE.
I patched mame in order to keep track of this 'memory_region'. This is done
in VIDEO_START via a global variable (region_zoomy) just like in some other
drivers.
This commit is contained in:
Aaron Giles 2008-09-26 05:38:40 +00:00
parent decc35b5f2
commit 8a78b0252d
1 changed files with 4 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
src/mame/video/neogeo.c
View File

@ -35,6 +35,7 @@ static emu_timer *auto_animation_timer;
static emu_timer *sprite_line_timer;
static const UINT8 *region_zoomy;
/*************************************
@ -504,7 +505,7 @@ static void draw_sprites(running_machine *machine, bitmap_t *bitmap, int scanlin
}
}
sprite_y_and_tile = memory_region(machine, "zoomy")[(zoom_y << 8) | zoom_line];
sprite_y_and_tile = region_zoomy[(zoom_y << 8) | zoom_line];
sprite_y = sprite_y_and_tile & 0x0f;
tile = sprite_y_and_tile >> 4;
@ -902,6 +903,8 @@ VIDEO_START( neogeo )
state_save_register_global(auto_animation_frame_counter);
state_save_register_postload(machine, regenerate_pens, NULL);
region_zoomy = memory_region(machine, "zoomy");
}