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more precise fps in window title

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This commit is contained in:
Matthew Berry 2021-02-14 00:03:09 -08:00
parent f03c90a13b
commit 02b596943e
1 changed files with 22 additions and 11 deletions
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33
src/crab/display.cr
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@ -4,11 +4,14 @@ class Display
WIDTH = 240
HEIGHT = 160
SCALE = 4
@fps = 30
@microseconds = 0
@frames = 0
@last_time = Time.utc
@seconds : Int32 = Time.utc.second
def initialize
@window = SDL::Window.new(window_title, WIDTH * SCALE, HEIGHT * SCALE, flags: SDL::Window::Flags::OPENGL)
@window = SDL::Window.new(window_title(59.7), WIDTH * SCALE, HEIGHT * SCALE, flags: SDL::Window::Flags::OPENGL)
setup_gl
end
@ -16,17 +19,25 @@ class Display
LibGL.tex_image_2d(LibGL::TEXTURE_2D, 0, LibGL::RGB5, 240, 160, 0, LibGL::RGBA, LibGL::UNSIGNED_SHORT_1_5_5_5_REV, framebuffer)
LibGL.draw_arrays(LibGL::TRIANGLE_STRIP, 0, 4)
LibSDL.gl_swap_window(@window)
@fps += 1
if Time.utc.second != @seconds
@window.title = window_title
@fps = 0
@seconds = Time.utc.second
end
update_draw_count
end
private def window_title : String
"crab - #{@fps} fps"
private def window_title(fps : Float) : String
"crab - #{fps.round(1)} fps"
end
private def update_draw_count : Nil
current_time = Time.utc
@microseconds += (current_time - @last_time).microseconds
@last_time = current_time
@frames += 1
if current_time.second != @seconds
fps = @frames * 1_000_000 / @microseconds
@window.title = window_title(fps)
@microseconds = 0
@frames = 0
@seconds = current_time.second
end
end
private def compile_shader(source : String, type : UInt32) : UInt32