From ab532cca844d6f52bc50ccf6be3176660c75c46f Mon Sep 17 00:00:00 2001
From: cam900 <dbtlrchl@naver.com>
Date: Sat, 14 Jan 2023 04:10:33 +0900
Subject: [PATCH] Fix free QSound ADPCM space calculation (#826)

---
 src/engine/platform/qsound.cpp | 6 ++++--
 src/engine/platform/qsound.h   | 1 +
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/engine/platform/qsound.cpp b/src/engine/platform/qsound.cpp
index 299e980a6..a75b3bfaa 100644
--- a/src/engine/platform/qsound.cpp
+++ b/src/engine/platform/qsound.cpp
@@ -707,11 +707,11 @@ const void* DivPlatformQSound::getSampleMem(int index) {
 }
 
 size_t DivPlatformQSound::getSampleMemCapacity(int index) {
-  return (index == 0 || index == 1) ? 16777216 : 0;
+  return index == 0 ? 16777216 : index == 1 ? (16777216 - sampleMemUsage) : 0;
 }
 
 size_t DivPlatformQSound::getSampleMemUsage(int index) {
-  return index == 0 ? sampleMemLen : index == 1 ? sampleMemLenBS : 0;
+  return index == 0 ? sampleMemLen : index == 1 ? (sampleMemLenBS - sampleMemUsage) : 0;
 }
 
 bool DivPlatformQSound::isSampleLoaded(int index, int sample) {
@@ -766,6 +766,7 @@ void DivPlatformQSound::renderSamples(int sysID) {
   sampleMemLen=memPos+256;
 
   memPos=(memPos+0xffff)&0xff0000;
+  sampleMemUsage=memPos;
 
   for (int i=0; i<parent->song.sampleLen; i++) {
     DivSample* s=parent->song.sample[i];
@@ -818,6 +819,7 @@ int DivPlatformQSound::init(DivEngine* p, int channels, int sugRate, const DivCo
   sampleMem=new unsigned char[getSampleMemCapacity()];
   sampleMemLen=0;
   sampleMemLenBS=0;
+  sampleMemUsage=0;
   chip.rom_data=sampleMem;
   chip.rom_mask=0xffffff;
   reset();
diff --git a/src/engine/platform/qsound.h b/src/engine/platform/qsound.h
index f0b0ed03b..c04514ed8 100644
--- a/src/engine/platform/qsound.h
+++ b/src/engine/platform/qsound.h
@@ -50,6 +50,7 @@ class DivPlatformQSound: public DivDispatch {
   unsigned char* sampleMem;
   size_t sampleMemLen;
   size_t sampleMemLenBS;
+  size_t sampleMemUsage;
   bool sampleLoaded[256];
   bool sampleLoadedBS[256];
   struct qsound_chip chip;