From 4dfd9f4230a2677501756b6121024593f1b37d86 Mon Sep 17 00:00:00 2001
From: notaz <notasas@gmail.com>
Date: Thu, 8 Feb 2007 23:19:53 +0000
Subject: [PATCH] audio improvement wip

git-svn-id: file:///home/notaz/opt/svn/PicoDrive/platform@33 be3aeb3a-fb24-0410-a615-afba39da0efa
---
 gp2x/{940ctl_ym2612.c => 940ctl.c} | 24 ++++++++++++++++--------
 gp2x/{940ctl_ym2612.h => 940ctl.h} |  1 +
 gp2x/Makefile                      |  2 +-
 gp2x/gp2x.c                        | 11 +++++++++++
 gp2x/main.c                        |  3 +++
 5 files changed, 32 insertions(+), 9 deletions(-)
 rename gp2x/{940ctl_ym2612.c => 940ctl.c} (93%)
 rename gp2x/{940ctl_ym2612.h => 940ctl.h} (89%)

diff --git a/gp2x/940ctl_ym2612.c b/gp2x/940ctl.c
similarity index 93%
rename from gp2x/940ctl_ym2612.c
rename to gp2x/940ctl.c
index bd88c71..5c53761 100644
--- a/gp2x/940ctl_ym2612.c
+++ b/gp2x/940ctl.c
@@ -333,6 +333,16 @@ void sharedmem_init(void)
 }
 
 
+void sharedmem_deinit(void)
+{
+	munmap(shared_mem, 0x210000);
+	munmap(mp3_mem, MP3_SIZE_MAX);
+	shared_mem = mp3_mem = NULL;
+	shared_data = NULL;
+	shared_ctl = NULL;
+}
+
+
 extern char **g_argv;
 
 /* none of the functions in this file should be called before this one */
@@ -433,19 +443,17 @@ void YM2612ResetChip_940(void)
 int YM2612UpdateOne_940(int *buffer, int length, int stereo, int is_buf_empty)
 {
 	int *ym_buf = shared_data->ym_buffer;
+	int ym_active_chs;
 
 	//printf("YM2612UpdateOne_940()\n");
 
 	if (CHECK_BUSY(JOB940_YM2612UPDATEONE)) wait_busy_940(JOB940_YM2612UPDATEONE);
 
-	// mix in ym buffer
-	if (is_buf_empty) memcpy32(buffer, ym_buf, length<<stereo);
-	// else TODO
+	ym_active_chs = shared_ctl->ym_active_chs;
 
-//	for (len = length << stereo; len > 0; len--)
-//	{
-//		*dest_buf++ += *ym_buf++;
-//	}
+	// mix in ym buffer. is_buf_empty means nobody mixed there anything yet and it may contain trash
+	if (is_buf_empty && ym_active_chs) memcpy32(buffer, ym_buf, length<<stereo);
+	else memset32(buffer, 0, length<<stereo);
 
 	if (shared_ctl->writebuffsel == 1) {
 		shared_ctl->writebuff0[writebuff_ptr] = 0xffff;
@@ -467,7 +475,7 @@ int YM2612UpdateOne_940(int *buffer, int length, int stereo, int is_buf_empty)
 
 	add_job_940(JOB940_YM2612UPDATEONE);
 
-	return 1;
+	return ym_active_chs;
 }
 
 
diff --git a/gp2x/940ctl_ym2612.h b/gp2x/940ctl.h
similarity index 89%
rename from gp2x/940ctl_ym2612.h
rename to gp2x/940ctl.h
index 186a6df..95e9a07 100644
--- a/gp2x/940ctl_ym2612.h
+++ b/gp2x/940ctl.h
@@ -1,4 +1,5 @@
 void sharedmem_init(void);
+void sharedmem_deinit(void);
 
 void YM2612Init_940(int baseclock, int rate);
 void YM2612ResetChip_940(void);
diff --git a/gp2x/Makefile b/gp2x/Makefile
index 5efe302..d4de0ec 100644
--- a/gp2x/Makefile
+++ b/gp2x/Makefile
@@ -34,7 +34,7 @@ OBJCOPY = $(CROSS)objcopy
 # frontend
 OBJS += main.o menu.o gp2x.o usbjoy.o emu.o squidgehack.o asmutils.o cpuctrl.o
 # 940 core control
-OBJS += 940ctl_ym2612.o
+OBJS += 940ctl.o
 # Pico
 OBJS += ../../Pico/Area.o ../../Pico/Cart.o ../../Pico/Utils.o ../../Pico/Memory.o ../../Pico/Misc.o \
 		../../Pico/Pico.o ../../Pico/Sek.o ../../Pico/VideoPort.o ../../Pico/Draw2.o ../../Pico/Draw.o
diff --git a/gp2x/gp2x.c b/gp2x/gp2x.c
index 18c5e48..b02a685 100644
--- a/gp2x/gp2x.c
+++ b/gp2x/gp2x.c
@@ -52,6 +52,7 @@ void *gp2x_screen;
 #define FRAMEBUFF_ADDR3 0x4000000-640*480*4
 
 static const int gp2x_screenaddrs[] = { FRAMEBUFF_ADDR0, FRAMEBUFF_ADDR1, FRAMEBUFF_ADDR2, FRAMEBUFF_ADDR3 };
+static unsigned short gp2x_screenaddr_old[4];
 
 
 /* video stuff */
@@ -269,6 +270,11 @@ void gp2x_init(void)
 	gp2x_screen = gp2x_screens[0];
 	screensel = 0;
 
+	gp2x_screenaddr_old[0] = gp2x_memregs[0x290E>>1];
+	gp2x_screenaddr_old[1] = gp2x_memregs[0x2910>>1];
+	gp2x_screenaddr_old[2] = gp2x_memregs[0x2912>>1];
+	gp2x_screenaddr_old[3] = gp2x_memregs[0x2914>>1];
+
 	// snd
   	mixerdev = open("/dev/mixer", O_RDWR);
 	if (mixerdev == -1)
@@ -288,6 +294,11 @@ void gp2x_deinit(void)
 	Pause940(1);
 
 	gp2x_video_changemode(15);
+	gp2x_memregs[0x290E>>1] = gp2x_screenaddr_old[0];
+	gp2x_memregs[0x2910>>1] = gp2x_screenaddr_old[1];
+	gp2x_memregs[0x2912>>1] = gp2x_screenaddr_old[2];
+	gp2x_memregs[0x2914>>1] = gp2x_screenaddr_old[3];
+
 	munmap(gp2x_screens[0], 640*480*4);
 	munmap((void *)gp2x_memregs, 0x10000);
 	close(memdev);
diff --git a/gp2x/main.c b/gp2x/main.c
index 5422b2b..23d6241 100644
--- a/gp2x/main.c
+++ b/gp2x/main.c
@@ -12,6 +12,7 @@
 #include "gp2x.h"
 #include "menu.h"
 #include "emu.h"
+#include "940ctl.h"
 #include "version.h"
 
 #include "squidgehack.h"
@@ -94,6 +95,7 @@ int main(int argc, char *argv[])
 		set_RAM_Timings(6, 4, 1, 1, 1, 2, 2);
 		printf("done.\n"); fflush(stdout);
 	}
+	sharedmem_init();
 	emu_Init();
 
 	engineState = PGS_Menu;
@@ -134,6 +136,7 @@ int main(int argc, char *argv[])
 	endloop:
 
 	emu_Deinit();
+	sharedmem_deinit();
 	cpuctrl_deinit();
 	gp2x_deinit();
 	if(mmuhack_status)
-- 
2.39.2