Re: [Factor-talk] OpenGL gadget question

[Jon Harper]

Also, the opengl matrix stacks were part of the "fixed function
pipeline". It was totally removed in openGL 4 and replaced by the
programmable  shaders. You can read about it on Joe's blog:
http://duriansoftware.com/joe/An-intro-to-modern-OpenGL.-Table-of-Contents.html
Jon


On Sun, Apr 24, 2016 at 8:45 PM, Jon Harper  wrote:
> Hi,
> do-matrix is a very thin wrapper around glPushMatrix and glPopMatrix
> (https://www.opengl.org/sdk/docs/man2/xhtml/glPushMatrix.xml), so for
> a theoretical explanation, I suggest you read about linear algebra
> (how a matrix can represent a linear transformation such as a
> translation, a rotation, a projection, etc) and the openGL matrix
> stacks used in the rendering pipeline (how opengl transforms your
> coordinates). But to explain everything, you will need more than a few
> words...
>
> From a more practical point of view, the do-matrix call in tetris
> means that the effects of the call to "glScalef" (in  "scale-board")
> end after do-matrix returns. Note that since factor also uses
> do-matrix to call the draw-gadget* word, it would have ended after
> draw-gadget* returned anyway.
>
> Also, if you don't use openGL functions that modify the current matrix
> (see 
> http://docs.factorcode.org/content/article-opengl-modeling-transformations.html),
> the do-matrix word doesn't do anything for you.
>
> Hope that helps,
> Jon
>
> Jon
>
>
> On Sun, Apr 24, 2016 at 7:22 PM, Alexander Ilin  wrote:
>> Thanks fore the reply!
>>
>>   Could someone explain to me in a few words what is do-matrix used for?
>>   I'm not sure I need it, I just copied the code from the tetris example.
>>
>> 24.04.2016, 19:51, "John Benediktsson" :
>>> You can log to the terminal/console standard output using:
>>>
>>> [ "foo" . ] with-global
>>>
>>> The problem with your listener output issue is probably pref-dim is called 
>>> before the new window opens and draw-gadget is called after and the 
>>> output-stream (initially set to the listener) is rebound to something other 
>>> than the listener you expect it to be.
>>>
>>> You could also save the listener output stream somewhere:
>>>
>>> SYMBOL: my-output-stream
>>>
>>> output-stream get my-output-stream set-global
>>>
>>> Then use it to make sure output goes to the right place:
>>>
>>> my-output-stream [ "foo" . ] with-output-stream
>>>
>>> There are other ways maybe to make that cleaner but if you only need debug 
>>> output that should fix it for you.
>>>
  M: iqlink-gadget draw-gadget*
   drop [ origin get { 5 5 } gl-fill-rect ] do-matrix "draw-gadget*" . 
 gl-error ;
>>
>> ---=---
>>  Александр
>>
>> --
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>> Applications Manager provides deep performance insights into multiple tiers 
>> of
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Re: [Factor-talk] OpenGL gadget question

[Jon Harper]

Hi,
do-matrix is a very thin wrapper around glPushMatrix and glPopMatrix
(https://www.opengl.org/sdk/docs/man2/xhtml/glPushMatrix.xml), so for
a theoretical explanation, I suggest you read about linear algebra
(how a matrix can represent a linear transformation such as a
translation, a rotation, a projection, etc) and the openGL matrix
stacks used in the rendering pipeline (how opengl transforms your
coordinates). But to explain everything, you will need more than a few
words...

From a more practical point of view, the do-matrix call in tetris
means that the effects of the call to "glScalef" (in  "scale-board")
end after do-matrix returns. Note that since factor also uses
do-matrix to call the draw-gadget* word, it would have ended after
draw-gadget* returned anyway.

Also, if you don't use openGL functions that modify the current matrix
(see 
http://docs.factorcode.org/content/article-opengl-modeling-transformations.html),
the do-matrix word doesn't do anything for you.

Hope that helps,
Jon

Jon


On Sun, Apr 24, 2016 at 7:22 PM, Alexander Ilin  wrote:
> Thanks fore the reply!
>
>   Could someone explain to me in a few words what is do-matrix used for?
>   I'm not sure I need it, I just copied the code from the tetris example.
>
> 24.04.2016, 19:51, "John Benediktsson" :
>> You can log to the terminal/console standard output using:
>>
>> [ "foo" . ] with-global
>>
>> The problem with your listener output issue is probably pref-dim is called 
>> before the new window opens and draw-gadget is called after and the 
>> output-stream (initially set to the listener) is rebound to something other 
>> than the listener you expect it to be.
>>
>> You could also save the listener output stream somewhere:
>>
>> SYMBOL: my-output-stream
>>
>> output-stream get my-output-stream set-global
>>
>> Then use it to make sure output goes to the right place:
>>
>> my-output-stream [ "foo" . ] with-output-stream
>>
>> There are other ways maybe to make that cleaner but if you only need debug 
>> output that should fix it for you.
>>
>>>  M: iqlink-gadget draw-gadget*
>>>   drop [ origin get { 5 5 } gl-fill-rect ] do-matrix "draw-gadget*" . 
>>> gl-error ;
>
> ---=---
>  Александр
>
> --
> Find and fix application performance issues faster with Applications Manager
> Applications Manager provides deep performance insights into multiple tiers of
> your business applications. It resolves application problems quickly and
> reduces your MTTR. Get your free trial!
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Re: [Factor-talk] OpenGL gadget question

[Alexander Ilin]

Thanks fore the reply!

  Could someone explain to me in a few words what is do-matrix used for?
  I'm not sure I need it, I just copied the code from the tetris example.

24.04.2016, 19:51, "John Benediktsson" :
> You can log to the terminal/console standard output using:
>
> [ "foo" . ] with-global
>
> The problem with your listener output issue is probably pref-dim is called 
> before the new window opens and draw-gadget is called after and the 
> output-stream (initially set to the listener) is rebound to something other 
> than the listener you expect it to be.
>
> You could also save the listener output stream somewhere:
>
> SYMBOL: my-output-stream
>
> output-stream get my-output-stream set-global
>
> Then use it to make sure output goes to the right place:
>
> my-output-stream [ "foo" . ] with-output-stream
>
> There are other ways maybe to make that cleaner but if you only need debug 
> output that should fix it for you.
>
>>  M: iqlink-gadget draw-gadget*
>>   drop [ origin get { 5 5 } gl-fill-rect ] do-matrix "draw-gadget*" . 
>> gl-error ;

---=---
 Александр

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Re: [Factor-talk] OpenGL gadget question

[John Benediktsson]

You can log to the terminal/console standard output using:

[ "foo" . ] with-global

The problem with your listener output issue is probably pref-dim is called 
before the new window opens and draw-gadget is called after and the 
output-stream (initially set to the listener) is rebound to something other 
than the listener you expect it to be. 

You could also save the listener output stream somewhere:

SYMBOL: my-output-stream

output-stream get my-output-stream set-global 

Then use it to make sure output goes to the right place:

my-output-stream [ "foo" . ] with-output-stream

There are other ways maybe to make that cleaner but if you only need debug 
output that should fix it for you. 



> On Apr 24, 2016, at 9:40 AM, Alexander Ilin  wrote:
> 
> Hello!
> 
>  I've got the following gadget implementation:
> USING: kernel ui.gadgets 
>  ui.render opengl prettyprint namespaces ;
> IN: iqlink.gadget
> 
> TUPLE: iqlink-gadget < gadget ;
> 
> :  ( -- gadget )
>  iqlink-gadget new ;
> 
> M: iqlink-gadget pref-dim*
>  drop { 900 600 } "pref-dim*" . ;
> 
> M: iqlink-gadget draw-gadget*
>  drop [ origin get { 5 5 } gl-fill-rect ] do-matrix "draw-gadget*" . gl-error 
> ;
> 
>  I'm displaying it in a window like so:
> [  "IQLink" open-window ] with-ui
> 
>  In the Listener output I expect to see the line "draw-gadget*" every time 
> the window is redrawn. However, I only see "pref-dim*" once, and  the line 
> "draw-gadget*" is never added to the Listener output. It appears as if  the 
> method draw-gadget* is never called.
> 
>  What do I do wrong?
> 
> 
> ---=---
> Александр
> 
> --
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> Applications Manager provides deep performance insights into multiple tiers of
> your business applications. It resolves application problems quickly and
> reduces your MTTR. Get your free trial!
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[Factor-talk] OpenGL gadget question

[Alexander Ilin]

Hello!

  I've got the following gadget implementation:
USING: kernel ui.gadgets 
  ui.render opengl prettyprint namespaces ;
IN: iqlink.gadget

TUPLE: iqlink-gadget < gadget ;

:  ( -- gadget )
  iqlink-gadget new ;
  
M: iqlink-gadget pref-dim*
  drop { 900 600 } "pref-dim*" . ;

M: iqlink-gadget draw-gadget*
  drop [ origin get { 5 5 } gl-fill-rect ] do-matrix "draw-gadget*" . gl-error ;

  I'm displaying it in a window like so:
[  "IQLink" open-window ] with-ui

  In the Listener output I expect to see the line "draw-gadget*" every time the 
window is redrawn. However, I only see "pref-dim*" once, and  the line 
"draw-gadget*" is never added to the Listener output. It appears as if  the 
method draw-gadget* is never called.

  What do I do wrong?


---=---
 Александр

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