From d8f66523b6d0cbae18fa2d61db577b2effa5fd43 Mon Sep 17 00:00:00 2001
From: tildearrow <me@tildearrow.org>
Date: Sat, 8 Mar 2025 04:37:42 -0500
Subject: [PATCH] NDS: prepare for optimization

---
 src/engine/platform/sound/nds.cpp | 14 ++++++++++++++
 src/engine/platform/sound/nds.hpp |  2 ++
 2 files changed, 16 insertions(+)

diff --git a/src/engine/platform/sound/nds.cpp b/src/engine/platform/sound/nds.cpp
index e0b138878..fa45048a0 100644
--- a/src/engine/platform/sound/nds.cpp
+++ b/src/engine/platform/sound/nds.cpp
@@ -54,6 +54,15 @@ namespace nds_sound_emu
 		m_routput = 0;
 	}
 
+  s32 nds_sound_t::predict() {
+    s32 ret=INT32_MAX;
+    for (u8 i = 0; i < 16; i++) {
+      const s32 next=m_channel[i].predict();
+      if (next<ret) ret=next;
+    }
+    return ret;
+  }
+
 	void nds_sound_t::tick(s32 cycle)
 	{
 		m_loutput = m_routput = (m_bias & 0x3ff);
@@ -328,6 +337,11 @@ namespace nds_sound_emu
 		}
 	}
 
+  s32 nds_sound_t::channel_t::predict() {
+    if (!m_playing) return INT32_MAX;
+    return m_counter-m_freq;
+  }
+
 	void nds_sound_t::channel_t::fetch()
 	{
 		if (m_playing)
diff --git a/src/engine/platform/sound/nds.hpp b/src/engine/platform/sound/nds.hpp
index 8f67f436a..0ffa045ab 100644
--- a/src/engine/platform/sound/nds.hpp
+++ b/src/engine/platform/sound/nds.hpp
@@ -121,6 +121,7 @@ namespace nds_sound_emu
 
 			void reset();
 			void tick(s32 cycle);
+      s32 predict();
 
 			// host accesses
 			u32 read32(u32 addr);
@@ -205,6 +206,7 @@ namespace nds_sound_emu
 					void write(u32 offset, u32 data, u32 mask = ~0);
 
 					void update(s32 cycle);
+          s32 predict();
 
 					// getters
 					// control word