190 lines
8.9 KiB
Rust
190 lines
8.9 KiB
Rust
use super::*;
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use crate::native_core::apu::ApuStateTail;
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use crate::native_core::state_io as sio;
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const BUS_STATE_CTX: &str = "bus state";
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impl NativeBus {
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pub fn save_state(&self, out: &mut Vec<u8>) {
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out.extend_from_slice(&self.cpu_ram);
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self.ppu.save_state(out);
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out.extend_from_slice(self.apu.registers());
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out.push(self.cpu_open_bus);
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out.push(self.joypad_state);
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out.push(self.joypad_shift);
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out.push(self.joypad2_state);
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out.push(self.joypad2_shift);
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out.push(u8::from(self.joypad_strobe));
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out.push(u8::from(self.nmi_pending));
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out.extend_from_slice(&self.ppu_dot.to_le_bytes());
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out.push(u8::from(self.odd_frame));
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out.push(u8::from(self.in_vblank));
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out.push(u8::from(self.mmc3_a12_prev_high));
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out.extend_from_slice(&self.mmc3_a12_low_dots.to_le_bytes());
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out.extend_from_slice(&self.mmc3_last_irq_scanline.to_le_bytes());
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self.apu.save_state_tail(out);
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let mut mapper_state = Vec::new();
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self.mapper.save_state(&mut mapper_state);
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out.extend_from_slice(&(mapper_state.len() as u32).to_le_bytes());
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out.extend_from_slice(&mapper_state);
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}
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pub fn load_state(&mut self, data: &[u8]) -> Result<(), String> {
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let mut cursor = 0usize;
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self.cpu_ram.copy_from_slice(sio::take_exact(
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data,
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&mut cursor,
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CPU_RAM_SIZE,
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BUS_STATE_CTX,
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)?);
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let ppu_consumed = self.ppu.load_state(&data[cursor..])?;
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cursor = cursor.saturating_add(ppu_consumed);
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let mut apu_regs = [0u8; 0x20];
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apu_regs.copy_from_slice(sio::take_exact(data, &mut cursor, 0x20, BUS_STATE_CTX)?);
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self.apu.set_registers(apu_regs);
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self.frame_complete = false;
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self.cpu_open_bus = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?;
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self.joypad_state = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?;
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self.joypad_shift = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?;
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self.joypad2_state = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?;
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self.joypad2_shift = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?;
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self.joypad_strobe = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)? != 0;
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self.nmi_pending = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)? != 0;
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self.suppress_vblank_this_frame = false;
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self.ppu_dot = sio::take_u32(data, &mut cursor, BUS_STATE_CTX)?;
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self.ppu_dot %= PPU_DOTS_PER_FRAME;
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self.odd_frame = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)? != 0;
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self.in_vblank = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)? != 0;
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self.mmc3_a12_prev_high = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)? != 0;
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self.mmc3_a12_low_dots = u16::from_le_bytes([
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sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?,
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sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?,
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]);
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self.mmc3_last_irq_scanline = u32::from_le_bytes([
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sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?,
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sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?,
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sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?,
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sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?,
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]);
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let frame_cycle = sio::take_u32(data, &mut cursor, BUS_STATE_CTX)?;
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let frame_mode_5step = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)? != 0;
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let frame_irq_inhibit = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)? != 0;
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let frame_irq_pending = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)? != 0;
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let channel_enable_mask = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?;
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let mut length_counters = [0u8; 4];
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length_counters.copy_from_slice(sio::take_exact(data, &mut cursor, 4, BUS_STATE_CTX)?);
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let dmc_bytes_remaining = u16::from_le_bytes([
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sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?,
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sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?,
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]);
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let dmc_irq_enabled = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)? != 0;
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let dmc_irq_pending = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)? != 0;
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let dmc_cycle_counter = u16::from_le_bytes([
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sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?,
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sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?,
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]);
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let dmc_current_addr = u16::from_le_bytes([
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sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?,
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sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?,
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]);
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let dmc_sample_buffer = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?;
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let dmc_sample_buffer_valid = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)? != 0;
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let dmc_shift_reg = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?;
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let dmc_bits_remaining = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?;
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let dmc_silence = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)? != 0;
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let dmc_output_level = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?;
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let dmc_dma_request = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)? != 0;
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let mut envelope_divider = [0u8; 3];
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envelope_divider.copy_from_slice(sio::take_exact(data, &mut cursor, 3, BUS_STATE_CTX)?);
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let mut envelope_decay = [0u8; 3];
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envelope_decay.copy_from_slice(sio::take_exact(data, &mut cursor, 3, BUS_STATE_CTX)?);
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let envelope_start_flags = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?;
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let triangle_linear_counter = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?;
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let triangle_linear_reload_flag = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)? != 0;
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let mut sweep_divider = [0u8; 2];
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sweep_divider.copy_from_slice(sio::take_exact(data, &mut cursor, 2, BUS_STATE_CTX)?);
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let sweep_reload_flags = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?;
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let cpu_cycle_parity = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)? != 0;
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let frame_reset_pending = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)? != 0;
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let frame_reset_delay = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?;
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let pending_frame_mode_5step = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)? != 0;
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let pending_frame_irq_inhibit = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)? != 0;
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let pulse_timer_counter = [
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u16::from_le_bytes([
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sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?,
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sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?,
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]),
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u16::from_le_bytes([
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sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?,
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sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?,
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]),
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];
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let mut pulse_duty_step = [0u8; 2];
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pulse_duty_step.copy_from_slice(sio::take_exact(data, &mut cursor, 2, BUS_STATE_CTX)?);
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let triangle_timer_counter = u16::from_le_bytes([
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sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?,
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sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?,
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]);
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let triangle_step = sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?;
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let noise_timer_counter = u16::from_le_bytes([
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sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?,
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sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?,
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]);
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let noise_lfsr = u16::from_le_bytes([
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sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?,
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sio::take_u8(data, &mut cursor, BUS_STATE_CTX)?,
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]);
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self.apu.load_state_tail(ApuStateTail {
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frame_cycle,
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frame_mode_5step,
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frame_irq_inhibit,
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frame_irq_pending,
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channel_enable_mask,
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length_counters,
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dmc_bytes_remaining,
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dmc_irq_enabled,
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dmc_irq_pending,
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dmc_cycle_counter,
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dmc_current_addr,
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dmc_sample_buffer,
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dmc_sample_buffer_valid,
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dmc_shift_reg,
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dmc_bits_remaining,
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dmc_silence,
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dmc_output_level,
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dmc_dma_request,
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envelope_divider,
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envelope_decay,
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envelope_start_flags,
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triangle_linear_counter,
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triangle_linear_reload_flag,
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sweep_divider,
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sweep_reload_flags,
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cpu_cycle_parity,
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frame_reset_pending,
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frame_reset_delay,
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pending_frame_mode_5step,
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pending_frame_irq_inhibit,
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pulse_timer_counter,
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pulse_duty_step,
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triangle_timer_counter,
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triangle_step,
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noise_timer_counter,
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noise_lfsr,
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});
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let mapper_len = sio::take_u32(data, &mut cursor, BUS_STATE_CTX)? as usize;
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let mapper_state = sio::take_exact(data, &mut cursor, mapper_len, BUS_STATE_CTX)?;
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self.ppu.set_vblank(self.in_vblank);
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self.mapper.load_state(mapper_state)?;
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if cursor != data.len() {
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return Err("bus state: trailing bytes in payload".to_string());
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}
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Ok(())
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}
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}
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