Synchronise the controller status more spread out inside a rendered frame:

* before rendering a background;
* before rendering sprites;
* while rendering more than 128 samples of audio at once ("Prefer fluid video");
* after every 16 scanlines of CPU execution instead of every 1;
* while waiting for an audio buffer to become available;
* while killing time between frames with fast-forward disabled.

Controller presses and releases are now combined in a DS button bitfield using a shorter 32-bit algorithm. See entry.cpp:NDSSFCAccumulateJoypad and #define ACCUMULATE_JOYPAD in the source.

This is still not suitable for playing platformers frame-perfectly, but it's much better than half a second of latency to press or release a button, and one still needs to press buttons a bit more than just light taps. I'd say 50 milliseconds is the latency now. Platformers requiring more precision can be played with frameskip 0.

DMA does not require double-buffered displaying, so synchronise the controller more often by disabling double-buffered displaying again.

1 files changed, 3 insertions, 0 deletions

diff --git a/source/display.h b/source/display.h
index 8e65885..d00c5ed 100644
--- a/source/display.h
+++ b/source/display.h
@@ -97,6 +97,9 @@ void S9xGraphicsMode ();
 char *S9xParseArgs (char **argv, int argc);
 void S9xParseArg (char **argv, int &index, int argc);
 void S9xExtraUsage ();
+#ifdef ACCUMULATE_JOYPAD
+void NDSSFCAccumulateJoypad ();
+#endif
 uint32 S9xReadJoypad (int which1_0_to_4);
 bool8 S9xReadMousePosition (int which1_0_to_1, int &x, int &y, uint32 &buttons);
 bool8 S9xReadSuperScopePosition (int &x, int &y, uint32 &buttons);