aboutsummaryrefslogtreecommitdiff
path: root/nes/nes.go
blob: c4d09a0839be8909abce4cae1ade67722fb7d795 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
package nes

import (
	"crecher.net/gones/v2/cart"
	"crecher.net/gones/v2/cpu"
)

type Console struct {
	CPU *cpu.CPU
	Cart *cart.Cartridge
	RAM [0x800]uint8
	// PPU, APU, controllers once they exist
	cycles uint64
}

func New(c *cart.Cartridge) *Console {
	n := &Console{Cart: c}
	n.CPU = cpu.NewCPU(n)
	n.CPU.Reset()
	return n
}

func (n *Console) Step() int {
	cycles := n.CPU.Step()
	n.cycles += uint64(cycles)
	return cycles
}

func (n *Console) StepFrame() {
	const cyclesPerFrame = 29780 // 29780 ~ 1789773 / 60.1
	for done := 0; done < cyclesPerFrame; {
		done += n.Step()
	}
}