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https://github.com/ZDoom/gzdoom-gles.git
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3bfcc5c09c
spc_amp from a x.4 fixed point number to a normal float. - Switched SPC playback from the external SNESAPU.DLL to Blargg's LGPL snes_spc library. I've compiled it with the fast DSP rather than the highly accurate one, since I didn't notice a meaningful difference between the two in my limited testing. In short: SPC playback is now built in to ZDoom. You don't need to download anything extra to make it work, and it also works on Linux as well as Windows (though building with Linux is currently untested). - Fixed: Stereo separation was calculated very wrongly when in 2D sound mode. SVN r794 (trunk)
70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
/* Communicates with SPC the way the SNES would.
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Note: You'll need an "spc_rom.h" file that contains the 64-byte IPL ROM contents */
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#include "snes_spc/spc.h"
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#include "demo_util.h"
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#include <string.h>
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#include <stdio.h>
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static SNES_SPC* snes_spc;
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/* Make port access more convenient. Fakes time by simply incrementing it each call. */
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static spc_time_t stime;
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static int pread ( int port ) { return spc_read_port( snes_spc, stime++, port ); }
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static void pwrite( int port, int data ) { spc_write_port( snes_spc, stime++, port, data ); }
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static unsigned char const spc_rom [spc_rom_size] = {
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/* ROM data not provided with emulator */
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#include "spc_rom.h"
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};
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int main()
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{
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int i;
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/* Data to upload */
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static unsigned char const data [4] = "\xFA\xDE\xD1";
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unsigned const data_addr = 0xF5; /* second I/O port */
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snes_spc = spc_new();
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if ( !snes_spc ) error( "Out of memory" );
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spc_init_rom( snes_spc, spc_rom );
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spc_reset( snes_spc );
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/* Simulate reads and writes that SNES code would do */
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/* Wait for SPC to be ready */
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while ( pread( 0 ) != 0xAA || pread( 1 ) != 0xBB ) { }
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/* Start address */
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pwrite( 2, data_addr & 0xFF );
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pwrite( 3, data_addr >> 8 );
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/* Tell SPC to start transfer and wait for acknowledgement */
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pwrite( 0, 0xCC );
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pwrite( 1, 0x01 );
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while ( pread( 0 ) != 0xCC ) { }
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/* Send each byte and wait for acknowledgement */
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for ( i = 0; i < 4; i++ )
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{
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printf( "%02X ", data [i] );
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pwrite( 1, data [i] );
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pwrite( 0, i );
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while ( pread( 0 ) != i ) { }
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}
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printf( "\n" );
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/* Verify that data was transferred properly */
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for ( i = 0; i < 3; i++ )
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printf( "%02X ", pread( i + 1 ) );
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printf( "\n" );
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printf( "Cycles: %ld\n", (long) stime );
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spc_delete( snes_spc );
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return 0;
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}
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