Re: [racket-users] Time for draw-bitmap
This definitely seems worth experimenting with. big-bang does (can, really) create bitmaps itself. It gets 2htdp/image images from the user's program and then it can create a bitmap to draw them into directly, if it wants to. It may already be creating a bitmap explicitly, I'm not sure. Robby On Mon, May 11, 2015 at 12:43 AM, Jens Axel Søgaard jensa...@soegaard.net wrote: 2015-05-11 2:24 GMT+02:00 Robby Findler ro...@eecs.northwestern.edu: But if you have a specific destination in mind you can make the bitmap first and then draw the 2htdp/image into it (or anything into it!) When I use my own game-loop it is easy enough to use the make-bitmap method of the canvas. I did see a significant improvement in responsiveness, so I thought maybe the same trick could be used in the implementation of big-bang. It's tricky though since the user produces the bitmaps, not the big-bang loop itself. FWIW: On OS X the difference between the two methods is so large the game went from unplayable to playable (due to a single call to draw-bitmap). I saw times between 7-9 milliseconds for the call. /Jens Axel -- You received this message because you are subscribed to the Google Groups Racket Users group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [racket-users] Time for draw-bitmap
2015-05-11 0:56 GMT+02:00 Matthew Flatt mfl...@cs.utah.edu: At Mon, 11 May 2015 00:30:05 +0200, Jens Axel Søgaard wrote: 2015-05-11 0:07 GMT+02:00 Matthew Flatt mfl...@cs.utah.edu: If you're on OS X, try creating the bitmap with (send canvas make-bitmap screen-width screen-height) instead of (make-object bitmap% screen-width screen-height) Roughly, using the `make-bitmap` method creates a bitmap that's on the graphics card instead of main memory. Two thoughts: - will make-screen-bitmap work too? No, only the `make-bitmap` method. See also http://docs.racket-lang.org/draw/overview.html#%28part._.Portability%29 Ok. - If I insert images in the teaching languages, do they become screen-bitmaps automatically? No, I don't think so. It's possible that it would make sense for `freeze` to use `make-bitmap`-method bitmaps. The `pict-pre-render-pict` function is similar to `freeze`, except that it's for picts in Slideshow, and it does use the `make-bitmap` method of Slideshow's canvas. (As you might guess, Slideshow was the original motivation for the feature.) I'm not certain that using a `make-bitmap` method would make as much sense even for `freeze`, since those images are less tied to a specific destination. Thanks. -- You received this message because you are subscribed to the Google Groups Racket Users group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [racket-users] Time for draw-bitmap
2015-05-11 2:24 GMT+02:00 Robby Findler ro...@eecs.northwestern.edu: But if you have a specific destination in mind you can make the bitmap first and then draw the 2htdp/image into it (or anything into it!) When I use my own game-loop it is easy enough to use the make-bitmap method of the canvas. I did see a significant improvement in responsiveness, so I thought maybe the same trick could be used in the implementation of big-bang. It's tricky though since the user produces the bitmaps, not the big-bang loop itself. FWIW: On OS X the difference between the two methods is so large the game went from unplayable to playable (due to a single call to draw-bitmap). I saw times between 7-9 milliseconds for the call. /Jens Axel -- You received this message because you are subscribed to the Google Groups Racket Users group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [racket-users] Time for draw-bitmap
But if you have a specific destination in mind you can make the bitmap first and then draw the 2htdp/image into it (or anything into it!) Robby On Sunday, May 10, 2015, Matthew Flatt mfl...@cs.utah.edu wrote: At Mon, 11 May 2015 00:30:05 +0200, Jens Axel Søgaard wrote: 2015-05-11 0:07 GMT+02:00 Matthew Flatt mfl...@cs.utah.edu javascript:;: If you're on OS X, try creating the bitmap with (send canvas make-bitmap screen-width screen-height) instead of (make-object bitmap% screen-width screen-height) Roughly, using the `make-bitmap` method creates a bitmap that's on the graphics card instead of main memory. Two thoughts: - will make-screen-bitmap work too? No, only the `make-bitmap` method. See also http://docs.racket-lang.org/draw/overview.html#%28part._.Portability%29 - If I insert images in the teaching languages, do they become screen-bitmaps automatically? No, I don't think so. It's possible that it would make sense for `freeze` to use `make-bitmap`-method bitmaps. The `pict-pre-render-pict` function is similar to `freeze`, except that it's for picts in Slideshow, and it does use the `make-bitmap` method of Slideshow's canvas. (As you might guess, Slideshow was the original motivation for the feature.) I'm not certain that using a `make-bitmap` method would make as much sense even for `freeze`, since those images are less tied to a specific destination. -- You received this message because you are subscribed to the Google Groups Racket Users group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com javascript:;. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Racket Users group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [racket-users] Time for draw-bitmap
If you're on OS X, try creating the bitmap with (send canvas make-bitmap screen-width screen-height) instead of (make-object bitmap% screen-width screen-height) Roughly, using the `make-bitmap` method creates a bitmap that's on the graphics card instead of main memory. At Sun, 10 May 2015 23:14:08 +0200, Jens Axel Søgaard wrote: Hi All, The attached files are a work-in-progress. Eventually it will become a remake of Cees Kramer's Snoopy for C64. Anyways, the game represents an unmoveable object as a block structure. Today I decided to stop rendering the blocks for every frame. Instead they are rendered once to a background image, and then simply replace (send dc clear) with (send dc draw-bitmap the-background 0 0) in the game loop. To my surprise the frame rate dropped. It seems draw-bitmap is more expensive than I thought.? Or ... perhaps I am doing something that trips up draw-bitmap? Anyways, I have attached the game. To see the difference: Hold down the space bar. /Jens Axel -- You received this message because you are subscribed to the Google Groups Racket Users group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [racket-users] Time for draw-bitmap
Worked like a charm. Thanks! 2015-05-11 0:07 GMT+02:00 Matthew Flatt mfl...@cs.utah.edu: If you're on OS X, try creating the bitmap with (send canvas make-bitmap screen-width screen-height) instead of (make-object bitmap% screen-width screen-height) Roughly, using the `make-bitmap` method creates a bitmap that's on the graphics card instead of main memory. At Sun, 10 May 2015 23:14:08 +0200, Jens Axel Søgaard wrote: Hi All, The attached files are a work-in-progress. Eventually it will become a remake of Cees Kramer's Snoopy for C64. Anyways, the game represents an unmoveable object as a block structure. Today I decided to stop rendering the blocks for every frame. Instead they are rendered once to a background image, and then simply replace (send dc clear) with (send dc draw-bitmap the-background 0 0) in the game loop. To my surprise the frame rate dropped. It seems draw-bitmap is more expensive than I thought.? Or ... perhaps I am doing something that trips up draw-bitmap? Anyways, I have attached the game. To see the difference: Hold down the space bar. /Jens Axel -- You received this message because you are subscribed to the Google Groups Racket Users group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- -- Jens Axel Søgaard -- You received this message because you are subscribed to the Google Groups Racket Users group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [racket-users] Time for draw-bitmap
2015-05-11 0:07 GMT+02:00 Matthew Flatt mfl...@cs.utah.edu: If you're on OS X, try creating the bitmap with (send canvas make-bitmap screen-width screen-height) instead of (make-object bitmap% screen-width screen-height) Roughly, using the `make-bitmap` method creates a bitmap that's on the graphics card instead of main memory. Two thoughts: - will make-screen-bitmap work too? - If I insert images in the teaching languages, do they become screen-bitmaps automatically? /Jens Axel -- You received this message because you are subscribed to the Google Groups Racket Users group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [racket-users] Time for draw-bitmap
At Mon, 11 May 2015 00:30:05 +0200, Jens Axel Søgaard wrote: 2015-05-11 0:07 GMT+02:00 Matthew Flatt mfl...@cs.utah.edu: If you're on OS X, try creating the bitmap with (send canvas make-bitmap screen-width screen-height) instead of (make-object bitmap% screen-width screen-height) Roughly, using the `make-bitmap` method creates a bitmap that's on the graphics card instead of main memory. Two thoughts: - will make-screen-bitmap work too? No, only the `make-bitmap` method. See also http://docs.racket-lang.org/draw/overview.html#%28part._.Portability%29 - If I insert images in the teaching languages, do they become screen-bitmaps automatically? No, I don't think so. It's possible that it would make sense for `freeze` to use `make-bitmap`-method bitmaps. The `pict-pre-render-pict` function is similar to `freeze`, except that it's for picts in Slideshow, and it does use the `make-bitmap` method of Slideshow's canvas. (As you might guess, Slideshow was the original motivation for the feature.) I'm not certain that using a `make-bitmap` method would make as much sense even for `freeze`, since those images are less tied to a specific destination. -- You received this message because you are subscribed to the Google Groups Racket Users group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
