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Contents
# -*- coding: utf-8 -*-
require 'singleton'
module DXRubySDL
module Window
# FPSTimer is copied from http://www.kmc.gr.jp/~ohai/fpstimer.rb.
class FPSTimer
include Singleton
FPS_COUNT = 10
attr_accessor :fps
attr_reader :real_fps, :total_skip
attr_reader :count_sleep
# +fps+ is the number of frames per second that you want to keep,
# +accurary+ is the accurary of sleep/SDL.delay in milisecond
def initialize(fps = 60, accurary = 10, skip_limit = 15)
@fps = fps
@accurary = accurary / 1000.0
@skip_limit = skip_limit
end
# reset timer, you should call just before starting loop
def reset
@old = get_ticks
@skip = 0
@real_fps = @fps
@frame_count = 0
@fps_old = @old
@count_sleep = 0
@total_skip = 0
end
# execute given block and wait
def wait_frame
now = get_ticks
nxt = @old + (1.0 / @fps)
if nxt > now
yield
@skip = 0
wait(nxt)
@old = nxt
elsif @skip > @skip_limit
# :nocov:
yield
@skip = 0
@old = get_ticks
# :nocov:
else
# :nocov:
@skip += 1
@total_skip += 1
@old = nxt
# :nocov:
end
calc_real_fps
end
private
def wait(nxt)
while nxt > get_ticks + @accurary
sleep(@accurary - 0.005)
@count_sleep += 1
end
while nxt > get_ticks
# busy loop, do nothing
end
end
def get_ticks
SDL.getTicks / 1000.0
end
def calc_real_fps
@frame_count += 1
if @frame_count >= FPS_COUNT
# :nocov:
@frame_count = 0
now = get_ticks
@real_fps = FPS_COUNT / (now - @fps_old)
@fps_old = now
# :nocov:
end
end
end
end
end
Version data entries
17 entries across 17 versions & 1 rubygems