diff options
Diffstat (limited to 'plugins/gme/game-music-emu-0.6pre/gme/Sgc_Impl.h')
| -rw-r--r-- | plugins/gme/game-music-emu-0.6pre/gme/Sgc_Impl.h | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/plugins/gme/game-music-emu-0.6pre/gme/Sgc_Impl.h b/plugins/gme/game-music-emu-0.6pre/gme/Sgc_Impl.h new file mode 100644 index 00000000..21b7e3f4 --- /dev/null +++ b/plugins/gme/game-music-emu-0.6pre/gme/Sgc_Impl.h @@ -0,0 +1,114 @@ +// Sega/Game Gear/Coleco SGC music file emulator implementation internals
+
+// Game_Music_Emu 0.6-pre
+#ifndef SGC_IMPL_H
+#define SGC_IMPL_H
+
+#include "Gme_Loader.h"
+#include "Rom_Data.h"
+#include "Z80_Cpu.h"
+
+class Sgc_Impl : public Gme_Loader {
+public:
+
+ // SGC file header
+ struct header_t
+ {
+ enum { size = 0xA0 };
+
+ char tag [4]; // "SGC\x1A"
+ byte vers; // 0x01
+ byte rate; // 0=NTSC 1=PAL
+ byte reserved1 [2];
+ byte load_addr [2];
+ byte init_addr [2];
+ byte play_addr [2];
+ byte stack_ptr [2];
+ byte reserved2 [2];
+ byte rst_addrs [7*2];
+ byte mapping [4]; // Used by Sega only
+ byte first_song; // Song to start playing first
+ byte song_count;
+ byte first_effect;
+ byte last_effect;
+ byte system; // 0=Master System 1=Game Gear 2=Colecovision
+ byte reserved3 [23];
+ char game [32]; // strings can be 32 chars, NOT terminated
+ char author [32];
+ char copyright [32];
+
+ // True if header has valid file signature
+ bool valid_tag() const;
+
+ int effect_count() const { return last_effect ? last_effect - first_effect + 1 : 0; }
+ };
+
+ // Header for currently loaded file
+ header_t const& header() const { return header_; }
+
+ int clock_rate() const { return header_.rate ? 3546893 : 3579545; }
+
+ // 0x2000 bytes
+ static void set_coleco_bios( void const* p ) { coleco_bios = p; }
+
+ // Clocks between calls to play routine
+ typedef int time_t;
+ void set_play_period( time_t p ) { play_period = p; }
+
+ // 0 = first track
+ blargg_err_t start_track( int );
+
+ // Runs for t clocks
+ blargg_err_t end_frame( time_t t );
+
+ // True if Master System or Game Gear
+ bool sega_mapping() const;
+
+protected:
+ typedef Z80_Cpu Sgc_Cpu;
+ Sgc_Cpu cpu;
+
+ typedef int addr_t;
+ virtual void cpu_out( time_t, addr_t, int data ) BLARGG_PURE( ; )
+
+// Implementation
+public:
+ Sgc_Impl();
+ ~Sgc_Impl();
+ virtual void unload();
+
+protected:
+ virtual blargg_err_t load_( Data_Reader& );
+
+private:
+ enum { bank_size = 0x4000 };
+
+ Rom_Data rom;
+ time_t play_period;
+ time_t next_play;
+ void const* bank2; // ROM selected for bank 2, in case RAM is currently hiding it
+ addr_t vectors_addr; // RST vectors start here
+ addr_t idle_addr; // return address for init/play routines
+ static void const* coleco_bios;
+
+ // large items
+ header_t header_;
+ blargg_vector<byte> vectors;
+ blargg_vector<byte> ram;
+ blargg_vector<byte> ram2;
+ blargg_vector<byte> unmapped_write;
+
+ bool run_cpu( time_t end );
+ void jsr( byte const (&addr) [2] );
+ void cpu_write( addr_t, int data );
+ int cpu_in( addr_t );
+
+ void set_bank( int bank, void const* data );
+};
+
+inline bool Sgc_Impl::sega_mapping() const
+{
+ return header_.system <= 1;
+}
+
+#endif
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