bugfixes, new scaling, double ym upd at 940

[picodrive.git] / platform / gp2x / 940ctl.c

diff --git a/platform/gp2x/940ctl.c b/platform/gp2x/940ctl.c
index bcbb09b..f2e98a9 100644 (file)
--- a/platform/gp2x/940ctl.c
+++ b/platform/gp2x/940ctl.c
@@ -66,8 +66,10 @@ static int   writebuff_ptr = 0;
 \r
 \r
 /* OPN Mode Register Write */\r
-static void set_timers( int v )\r
+static int set_timers( int v )\r
 {\r
+       int change;\r
+\r
        /* b7 = CSM MODE */\r
        /* b6 = 3 slot mode */\r
        /* b5 = reset b */\r
@@ -76,6 +78,7 @@ static void set_timers( int v )
        /* b2 = timer enable a */\r
        /* b1 = load b */\r
        /* b0 = load a */\r
+       change = (ST_mode ^ v) & 0xc0;\r
        ST_mode = v;\r
 \r
        /* reset Timer b flag */\r
@@ -85,6 +88,8 @@ static void set_timers( int v )
        /* reset Timer a flag */\r
        if( v & 0x10 )\r
                ST_status &= ~1;\r
+\r
+       return change;\r
 }\r
 \r
 /* YM2612 write */\r
@@ -93,11 +98,14 @@ static void set_timers( int v )
 /* returns 1 if sample affecting state changed */\r
 int YM2612Write_940(unsigned int a, unsigned int v)\r
 {\r
-       int addr; //, ret=1;\r
+       int addr;\r
+       int upd = 1;    /* the write affects sample generation */\r
 \r
        v &= 0xff;      /* adjust to 8 bit bus */\r
        a &= 3;\r
 \r
+       //printf("%05i:%03i: ym w ([%i] %02x)\n", Pico.m.frame_count, Pico.m.scanline, a, v);\r
+\r
        switch( a ) {\r
        case 0: /* address port 0 */\r
                if (!addr_A1 && ST_address == v)\r
@@ -108,7 +116,7 @@ int YM2612Write_940(unsigned int a, unsigned int v)
                        (v == 0x24 || v == 0x25 || v == 0x26 || v == 0x2a))\r
                                return 0;\r
                addr_A1 = 0;\r
-               //ret=0;\r
+               upd = 0;\r
                break;\r
 \r
        case 1: /* data port 0    */\r
@@ -152,14 +160,16 @@ int YM2612Write_940(unsigned int a, unsigned int v)
                                }\r
                                return 0;\r
                        case 0x27:      /* mode, timer control */\r
-                               set_timers( v );\r
-                               break; // other side needs ST.mode for 3slot mode\r
+                               if (set_timers( v ))\r
+                                       break; // other side needs ST.mode for 3slot mode\r
+                               return 0;\r
                        case 0x2a:      /* DAC data (YM2612) */\r
                                dacout = ((int)v - 0x80) << 6;  /* level unknown (notaz: 8 seems to be too much) */\r
                                return 0;\r
                        case 0x2b:      /* DAC Sel  (YM2612) */\r
                                /* b7 = dac enable */\r
                                dacen = v & 0x80;\r
+                               upd = 0;\r
                                break; // other side has to know this\r
                        default:\r
                                break;\r
@@ -173,7 +183,7 @@ int YM2612Write_940(unsigned int a, unsigned int v)
                        return 0;\r
                ST_address = v;\r
                addr_A1 = 1;\r
-               //ret=0;\r
+               upd = 0;\r
                break;\r
 \r
        case 3: /* data port 1    */\r
@@ -186,14 +196,25 @@ int YM2612Write_940(unsigned int a, unsigned int v)
                break;\r
        }\r
 \r
+       //printf("ym pass\n");\r
+\r
        if(currentConfig.EmuOpt & 4) {\r
-               /* queue this write for 940 */\r
-               if (writebuff_ptr < 2047) {\r
-                       if (shared_ctl->writebuffsel == 1) {\r
-                               shared_ctl->writebuff0[writebuff_ptr++] = (a<<8)|v;\r
-                       } else {\r
-                               shared_ctl->writebuff1[writebuff_ptr++] = (a<<8)|v;\r
+               UINT16 *writebuff = shared_ctl->writebuffsel ? shared_ctl->writebuff0 : shared_ctl->writebuff1;\r
+\r
+               /* detect rapid ym updates */\r
+               if (upd && !(writebuff_ptr & 0x80000000) && Pico.m.scanline < 224) {\r
+                       int mid = Pico.m.pal ? 68 : 93;\r
+                       if (Pico.m.scanline > mid) {\r
+                               //printf("%05i:%03i: rapid ym\n", Pico.m.frame_count, Pico.m.scanline);\r
+                               writebuff[writebuff_ptr++ & 0xffff] = 0xfffe;\r
+                               writebuff_ptr |= 0x80000000;\r
+                               //printf("%05i:%03i: ym w ([%02x] %02x, upd=%i)\n", Pico.m.frame_count, Pico.m.scanline, addr, v, upd);\r
                        }\r
+               }\r
+\r
+               /* queue this write for 940 */\r
+               if ((writebuff_ptr&0xffff) < 2047) {\r
+                       writebuff[writebuff_ptr++ & 0xffff] = (a<<8)|v;\r
                } else {\r
                        printf("warning: writebuff_ptr > 2047 ([%i] %02x)\n", a, v);\r
                }\r
@@ -301,7 +322,7 @@ void YM2612PicoStateLoad_940(void)
 \r
        addr_A1 = old_A1;\r
 \r
-       add_job_940(JOB940_PICOSTATELOAD);\r
+//     add_job_940(JOB940_PICOSTATELOAD);\r
 }\r
 \r
 \r
@@ -465,9 +486,9 @@ int YM2612UpdateOne_940(int *buffer, int length, int stereo, int is_buf_empty)
        else memset32(buffer, 0, length<<stereo);\r
 \r
        if (shared_ctl->writebuffsel == 1) {\r
-               shared_ctl->writebuff0[writebuff_ptr] = 0xffff;\r
+               shared_ctl->writebuff0[writebuff_ptr & 0xffff] = 0xffff;\r
        } else {\r
-               shared_ctl->writebuff1[writebuff_ptr] = 0xffff;\r
+               shared_ctl->writebuff1[writebuff_ptr & 0xffff] = 0xffff;\r
        }\r
        writebuff_ptr = 0;\r
 \r