80 lines
1.3 KiB
C
80 lines
1.3 KiB
C
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// NES APU state snapshot support
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// Nes_Snd_Emu 0.1.7
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#ifndef APU_STATE_H
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#define APU_STATE_H
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#include "blargg_common.h"
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struct apu_state_t
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{
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typedef BOOST::uint8_t byte;
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typedef byte env_t [3];
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/*struct env_t {
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byte delay;
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byte env;
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byte written;
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};*/
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struct apu_t {
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byte w40xx [0x14]; // $4000-$4013
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byte w4015; // enables
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byte w4017; // mode
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BOOST::uint16_t frame_delay;
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byte frame_step;
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byte irq_flag;
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} apu;
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struct square_t {
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BOOST::uint16_t delay;
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env_t env;
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byte length_counter;
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byte phase;
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byte swp_delay;
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byte swp_reset;
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byte unused2 [1];
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};
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square_t square1;
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square_t square2;
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struct triangle_t {
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BOOST::uint16_t delay;
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byte length_counter;
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byte phase;
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byte linear_counter;
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byte linear_mode;
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} triangle;
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struct noise_t {
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BOOST::uint16_t delay;
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env_t env;
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byte length_counter;
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BOOST::uint16_t shift_reg;
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} noise;
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struct dmc_t {
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BOOST::uint16_t delay;
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BOOST::uint16_t remain;
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BOOST::uint16_t addr;
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byte buf;
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byte bits_remain;
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byte bits;
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byte buf_full;
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byte silence;
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byte irq_flag;
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} dmc;
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//byte length_counters [4];
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enum { tag = 0x41505552 }; // 'APUR'
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void swap();
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};
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BOOST_STATIC_ASSERT( sizeof (apu_state_t) == 72 );
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#endif
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