From b3a7f8f1fceddcd45ec62bcbf75ba128e4f84f5a Mon Sep 17 00:00:00 2001
From: Nebuleon Fumika
Date: Sun, 3 Feb 2013 19:26:34 -0500
Subject: 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.
---
 source/gfx.cpp | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'source/gfx.cpp')

diff --git a/source/gfx.cpp b/source/gfx.cpp
index 1b429c6..9ea0a97 100644
--- a/source/gfx.cpp
+++ b/source/gfx.cpp
@@ -1169,6 +1169,14 @@ void S9xSetupOBJ ()
 
 static void DrawOBJS (bool8 OnMain = FALSE, uint8 D = 0)
 {
+#ifdef ACCUMULATE_JOYPAD
+/*
+ * This call allows NDSSFC to synchronise the DS controller more often.
+ * If porting a later version of Snes9x into NDSSFC, it is essential to
+ * preserve it.
+ */
+	NDSSFCAccumulateJoypad ();
+#endif
 #ifdef MK_DEBUG_RTO
 	if(Settings.BGLayering) fprintf(stderr, "Entering DrawOBJS() for %d-%d\n", GFX.StartY, GFX.EndY);
 #endif
@@ -2314,6 +2322,14 @@ static void DrawBackgroundMode5 (uint32 /* BGMODE */, uint32 bg, uint8 Z1, uint8
 
 static void DrawBackground (uint32 BGMode, uint32 bg, uint8 Z1, uint8 Z2)
 {
+#ifdef ACCUMULATE_JOYPAD
+/*
+ * This call allows NDSSFC to synchronise the DS controller more often.
+ * If porting a later version of Snes9x into NDSSFC, it is essential to
+ * preserve it.
+ */
+	NDSSFCAccumulateJoypad ();
+#endif
     GFX.PixSize = 1;
 	
     BG.TileSize = BGSizes [PPU.BG[bg].BGSize];
-- 
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