mirror of
https://github.com/imjasonh/nescript
synced 2026-07-08 17:06:04 +00:00
7507459787
Closes seven of the cc65/nesdoug parity gaps catalogued in docs/future-work.md in a single pass. All of the new features are gated on marker labels so programs that don't use them produce byte-identical ROM output (every pre-existing committed .nes file round-trips unchanged). Language / runtime additions: - `rand8()` / `rand16()` / `seed_rand(u16)` intrinsics backed by a 16-bit Galois LFSR (~30 bytes of runtime, ~40 cycles per draw). Reset path seeds state to 0xACE1 so the first draw is useful even without explicit seeding. - `p1.button.a.pressed` / `.released` edge-triggered input via a new ReadInputEdge IR op plus an NMI-side prev-frame snapshot into $07E6/$07E7, gated on the `__edge_input_used` marker. - `set_palette_brightness(level)` builtin mapping levels 0..8 to PPU mask emphasis bytes (`$2001`) for neslib-style screen fades. - `mapper: AxROM` (iNES 7) with automatic 32 KB PRG padding so emulators that enforce mapper-7's 32 KB page size boot cleanly. - `mapper: CNROM` (iNES 3) with a reset-time CHR bank 0 select. - `--fceux-labels <prefix>` CLI flag emitting per-bank `.nl` label files and a `.ram.nl` file for FCEUX's debugger. Tests + examples: - Five new example programs with committed .nes ROMs and pixel+audio goldens: prng_demo, edge_input_demo, palette_brightness_demo, axrom_simple, cnrom_simple. - Seven integration tests covering JSR emission, the omitted-when-unused invariant, the NMI prev-input snapshot, the correct mapper numbers for AxROM/CNROM, and negative tests for unknown button names and bad rand8 arity. - `is_intrinsic()` now runs in expression-position Call paths too, so `var x = rand8(1, 2)` errors at compile time instead of silently dropping the extra arguments.
25 lines
534 B
Text
25 lines
534 B
Text
// AxROM (mapper 7) demo — single 32 KB PRG with single-screen
|
|
// mirroring. Most homebrew AxROM games have multiple 32 KB pages;
|
|
// this minimal demo runs in bank 0 of a 32 KB-padded ROM to
|
|
// exercise the mapper's reset, bank-select register, and iNES
|
|
// header emission.
|
|
|
|
game "AxROM Demo" {
|
|
mapper: AxROM
|
|
}
|
|
|
|
var px: u8 = 120
|
|
var dx: u8 = 1
|
|
|
|
on frame {
|
|
if dx == 1 {
|
|
px += 1
|
|
if px >= 240 { dx = 0 }
|
|
} else {
|
|
px -= 1
|
|
if px == 0 { dx = 1 }
|
|
}
|
|
draw Ball at: (px, 100)
|
|
}
|
|
|
|
start Main
|