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#!/usr/bin/env ruby
# frozen_string_literal: true
##
# Generate the different values on `config/values/*.s` by parsing the values on
# `config/values.yml`. The values on that file are agnostic to NTSC or PAL, and
# it's up to this script to produce constants which make sense for NTSC and PAL.
# That is, it's a way to ensure that both NTSC and PAL have the same experience
# (or at least as close as possible).
##
# Parse the configuration.
require 'yaml'
config_path = File.join("#{File.dirname(__FILE__)}/..", 'config/')
config = YAML.safe_load_file(File.join(config_path, 'values.yml'))
# Converts the given floating point value into a signed fixed point value in the
# 4.4 format.
def to_signed_fixed_point(value)
integer = value.to_i
raise 'bad signed fixed point value' if integer > 7 || integer < -7
integer &= 0b00001111
decimal = (value % 1) * 100
decimal = ((decimal * 15) / 100.0).round & 0b00001111
(integer << 4) | decimal
end
##
# Loop through the configuration and fetch values for NTSC and PAL.
res = {}
config.each do |model, properties|
res[model] ||= { ntsc: {}, pal: {} }
properties.each do |name, ntsc|
name = name.upcase
pal = (ntsc * 6) / 5.0
res[model][:ntsc][name] = to_signed_fixed_point(ntsc)
res[model][:pal][name] = to_signed_fixed_point(pal)
end
end
##
# Generate each model as expected.
def to_hex(value)
hex = value.to_s(16).upcase
if hex.size == 1
"$0#{hex}"
else
"$#{hex}"
end
end
def values_to_asm(values)
values.map { |k, v| " #{k} = #{to_hex(v)}" }.join("\n")
end
res.each do |model, formats|
path = File.join(config_path, "values/#{model}.s")
contents = <<~HERE
;; This file has been automatically generated via bin/values.rb.
;; DO NOT MODIFY this file directly: check config/values.yml instead.
.ifdef PAL
#{values_to_asm(formats[:pal])}
.else
#{values_to_asm(formats[:ntsc])}
.endif
HERE
File.write(path, contents)
end
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