SPGL Shader/render State examples

[ryanm]

Howdy

I've been picking through spgl with a view to appropriating the clever stuff that I haven't the fortitude to reinvent, starting with the com.shavenpuppy.jglib.renderer stuff.
I suspect that if I mess up the implementation of the State object, I'll bork the sorting and any performance benefit will disappear.

Does anyone have any concrete examples of State objects, and/or the Shaders that produce them, that I can peruse? Even trivial ones would be a great help.

Cheers

[princec]

Yeah, I do believe I used it to render the backgrounds in Alien Flux. But it's very simple stuff unfortunately.

The trick is to get your States sorted so that the most expensive state changes are called least often.

Cas

[ryanm]

Yeah, I do believe I used it to render the backgrounds in Alien Flux. But it's very simple stuff unfortunately.

Anything is good. Is the source available anywhere? I take it you don't use it anymore? I suppose it's just sprites all over the shop for your stuff nowadays...

Just as a sanity check of what I'm thinking:

from most expensive to least

• Shader programs
• texture id
• server attributes
• client attributes
• any more?

Encode the expensive stuff into the top bits of the sort order, and the expensive changes should be minimised.

Are there any gotchas with the radix sort? Do I need to worry about the range of sort order values being too expansive?

Cheers

Games published by our own members! Check 'em out!

[princec]

I'll dig up some source when I get home. As for RadixSort, as far as I know there are no gotchas at all. Just make sure you give different integer IDs to each state as appropriate (texture ID for example makes a good sort index for it).

Cas

[ryanm]

Champion, I'll see how that goes.

Next to fall under my avaricious eye: Font rendering...

[princec]

My font rendering code is quite nice but really it needs to be ditched and incorporated in to the sprite engine so that glyphs are just sprites.

Cas

[ryanm]

Well that went well.


Java output on the top, followed by mine, and then the packed texture.

Changes made:

• Glyphs hold their own image data, rather than the Font
• Floating-point layout
• More dynamic - glyphs can be added as needed
• Font generator substantially refactored
• Uses the rectangle packer

I've flung it all up Google code if anyone wants a look.

• Font
• Glyph
• FontFactory

So, in summary, huzzah for the spgl!

edit: Incidentally, does anyone have any recommendations for fonts that definitely have kerning values? I've scanned through the 103 fonts on this system and not found any kerning pairs, so I'm wondering if there aren't any or if I've borked the kerning computation.

edit2: Nevermind, found the problem (which, incidentally, existed in SPGL too). Text rendering with kerning now works.

[princec]

ooh what problem was that? (Not that I've ever had a problem  )

Cas

[ryanm]

On line 474 of FontConverter you call drawGlyphVector() directly on the special graphics object, rather than using a TextLayout - which is apparently where the kerning information appears from. - and passing in the graphics object. The Javadocs refer to using a TextLayout, it just doesn't happen in the code.

Also, Java doesn't render with kerning by default, you need to derive the font with the appropriate TextAttribute map. Haven't tested that one myself, but that's what the docs say.

The code that works for me is linked above.

Hmmm, sounding like a bit of an ingrate here I'm not, honest!

[brackeen]

Oh, interesting. I had been trying to figure out how to get kerning info, but it my experience KERNING_ON didn't do anything (even with fonts that obviously have kerning in other apps).

What font are you using?

Games published by our own members! Check 'em out!

[ryanm]

Running

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private static void kerningHunt()    {       String[] fonts =             GraphicsEnvironment.getLocalGraphicsEnvironment().getAvailableFontFamilyNames();       System.out.println( fonts.length + " Available font families : " );       for( String fontname : fonts )       {          System.out.println( "Hunting for kerning in " + fontname );          FontFactory ff = new FontFactory( fontname );          boolean found = false;          for( int i = 0; i < defaultCharSet.length() && !found; i++ )          {             for( int j = 0; j < defaultCharSet.length() && !found; j++ )             {                char prev = defaultCharSet.charAt( i );                char next = defaultCharSet.charAt( j );                float k = ff.computeKerning( prev, next );                if( k != 0 )                {                   found = true;                   System.out.println( "\tkerning found!" );                   // System.out.println( "\t" + prev + " -> " + next +                  // " = " + k );               }             }          }       }    }

Gave me the output

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106 Available font families : Hunting for kerning in AlArabiya    kerning found! Hunting for kerning in AlBattar    kerning found! Hunting for kerning in AlHor    kerning found! Hunting for kerning in AlManzomah    kerning found! Hunting for kerning in AlMateen-Bold Hunting for kerning in AlMohanad    kerning found! Hunting for kerning in AlMothnna-Bold Hunting for kerning in AlYermook    kerning found! Hunting for kerning in AnjaliOldLipi Hunting for kerning in AR PL ShanHeiSun Uni Hunting for kerning in AR PL ZenKai Uni Hunting for kerning in Arab    kerning found! Hunting for kerning in Bitstream Charter Hunting for kerning in Bitstream Vera Sans    kerning found! Hunting for kerning in Bitstream Vera Sans Mono Hunting for kerning in Bitstream Vera Serif    kerning found! Hunting for kerning in Century Schoolbook L Hunting for kerning in Cortoba    kerning found! Hunting for kerning in Courier 10 Pitch Hunting for kerning in DejaVu Sans    kerning found! Hunting for kerning in DejaVu Sans Condensed    kerning found! Hunting for kerning in DejaVu Sans Light    kerning found! Hunting for kerning in DejaVu Sans Mono Hunting for kerning in DejaVu Serif    kerning found! Hunting for kerning in DejaVu Serif Condensed    kerning found! Hunting for kerning in Dialog Hunting for kerning in DialogInput Hunting for kerning in Dimnah    kerning found! Hunting for kerning in Dingbats Hunting for kerning in Electron    kerning found! Hunting for kerning in FreeMono Hunting for kerning in FreeSans    kerning found! Hunting for kerning in FreeSerif    kerning found! Hunting for kerning in Furat    kerning found! Hunting for kerning in Garuda Hunting for kerning in Gentium    kerning found! Hunting for kerning in GentiumAlt    kerning found! Hunting for kerning in Granada    kerning found! Hunting for kerning in Graph    kerning found! Hunting for kerning in Hani    kerning found! Hunting for kerning in Haramain    kerning found! Hunting for kerning in Hor    kerning found! Hunting for kerning in Japan    kerning found! Hunting for kerning in Jet    kerning found! Hunting for kerning in Kayrawan    kerning found! Hunting for kerning in Khalid    kerning found! Hunting for kerning in Kochi Gothic Hunting for kerning in Kochi Mincho Hunting for kerning in Lohit Gujarati Hunting for kerning in Lohit Hindi Hunting for kerning in Lohit Punjabi Hunting for kerning in Lohit Tamil Hunting for kerning in Loma    kerning found! Hunting for kerning in Lucida Bright Hunting for kerning in Lucida Sans Hunting for kerning in Lucida Sans Typewriter Hunting for kerning in Luxi Mono Hunting for kerning in Luxi Sans    kerning found! Hunting for kerning in Luxi Serif    kerning found! Hunting for kerning in Mallige Hunting for kerning in MalOtf Hunting for kerning in Mashq    kerning found! Hunting for kerning in Mashq-Bold    kerning found! Hunting for kerning in Metal    kerning found! Hunting for kerning in MgOpen Canonica    kerning found! Hunting for kerning in MgOpen Cosmetica Hunting for kerning in MgOpen Modata    kerning found! Hunting for kerning in MgOpen Moderna    kerning found! Hunting for kerning in Monospaced Hunting for kerning in Mukti Narrow Hunting for kerning in Nada    kerning found! Hunting for kerning in Nagham    kerning found! Hunting for kerning in Nice    kerning found! Hunting for kerning in Nimbus Mono L Hunting for kerning in Nimbus Roman No9 L Hunting for kerning in Nimbus Sans L Hunting for kerning in Norasi    kerning found! Hunting for kerning in OpenSymbol Hunting for kerning in Ostorah    kerning found! Hunting for kerning in Ouhod-Bold Hunting for kerning in Petra    kerning found! Hunting for kerning in Phetsarath OT Hunting for kerning in Purisa Hunting for kerning in Rachana_w01 Hunting for kerning in Rasheeq-Bold Hunting for kerning in Rehan    kerning found! Hunting for kerning in Salem    kerning found! Hunting for kerning in SansSerif Hunting for kerning in Serif Hunting for kerning in Shado    kerning found! Hunting for kerning in Sharjah    kerning found! Hunting for kerning in Sindibad    kerning found! Hunting for kerning in Standard Symbols L Hunting for kerning in Tarablus    kerning found! Hunting for kerning in Tholoth    kerning found! Hunting for kerning in Tlwg Typist Hunting for kerning in TlwgMono Hunting for kerning in TlwgTypewriter Hunting for kerning in UnBatang Hunting for kerning in UnDotum Hunting for kerning in URW Bookman L Hunting for kerning in URW Chancery L Hunting for kerning in URW Gothic L Hunting for kerning in URW Palladio L Hunting for kerning in utkal Hunting for kerning in Vemana2000

I tried to attach the list of kerning values that I found, but it's too big for the boards

[ryanm]

Also, I don't find any kerning information unless I derive the source font like so:

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Map<TextAttribute, Object> attributes = new HashMap<TextAttribute, Object>(); attributes.put( TextAttribute.KERNING, TextAttribute.KERNING_ON ); srcFont = java.awt.Font.decode( fontName ).deriveFont( attributes );

[brackeen]

Ah, you know what it is, a Java 6 implementation by a certain, uh, "fruit" company currently ignores KERNING_ON. Weird. The Sun implementation uses it.

BTW you don't have to use TextLayout or the faux Graphics2D - using font.layoutGlyphVector() has kerning.

Sorry to hijack the thread!

[princec]

Yeah, can't say I ever noticed kerning not working using the code as it is. It Just Worked.

Cas