HAM Fill demo effects

[DanScott]

are you redrawing the lines to clear the buffer? or is it a blitter clear?

[Jobbo]

Redrawing the lines. A 5 plane clear for 320x256 would by itself take over a frame.

[Jobbo]

Incidentally does anyone know how to consistently capture video from Winuae at 50hz in such a way that youtube will process it correctly?

[hooverphonique]

Nice HAM object :-)

Originally Posted by Jobbo

Incidentally does anyone know how to consistently capture video from Winuae at 50hz in such a way that youtube will process it correctly?

I think the resolution must be above a certain size (720p ?) to get 50Hz.

[Antiriad_UK]

I use the free Lagarith lossless codec to capture to .avi (after installing you select it in WinUAE). Then I use ffmpeg and a command line like this to crop it and convert to something that looks good after uploading to youtube.
https://lags.leetcode.net/codec.html

ffmpeg -i "output.avi" -vf "crop=704:544:44:20,scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2" -c:a aac -b:a 320k -ar 48000 -c:v libx264 -crf 1 -profile:v high -level 4.0 -preset slow -bf 2 -coder 1 -b:v 15M -r 50 -pix_fmt yuv420p -threads 8 -cpu-used 0 -f matroska "output_youtube_50fps.mkv"

[defor]

Originally Posted by Antiriad_UK

 ;(dx+1)*64 + 2
 .bltsize:
a set 0
    rept    BPL_BUF_WIDTH
    dc.w    ((a+1)<<6)+2        
a set a+1
    endr

Just an off-topic: Default REPTN counter can be used inside rept block in vasm.

[Tigerskunk]

Originally Posted by Jobbo

This is how it's looking after a lot of tricky changes to when and how each line is drawn.

It's a lot more trouble than it's probably worth but I don't think you could pull off a 4 bitplane poly shape this large with the blitter doing the fill.

It's running at 50hz with a screen size of 320x256.

[ Show youtube player ]

Amazing...

[rothers]

Would a raycaster in HAM just be too slow to bother with?

[DanScott]

Originally Posted by rothers

Would a raycaster in HAM just be too slow to bother with?

For what purpose? For a "Wolfenstein" style engine ? You could render to a chunky screen and then C2P to HAM, but it's certainly not very quick unless you have a very low resolution

This HAM object exploits the fact that you can set a colour on the edge of the polygon, and then hold that colour across the line (very similar to how a blitter fill, can fill a convex object)

[Frog]

in the demo Colors by Devils there's some HAM mode effect, i'm not sure about the rest of the demo :
[ Show youtube player ]

http://janeway.exotica.org.uk/release.php?id=752

[Jobbo]

Originally Posted by rothers

Would a raycaster in HAM just be too slow to bother with?

It’s hard to imagine a way that HAM would help with a Wolf3D engine.

If you flipped your tv on its side then maybe you could do something clever. But even then there’s probably other approaches that’d be faster.

Where it could come into its own is if you have a fast method for generating a span buffer for flat shaded worlds. Then you could use HAM to draw the spans quite efficiently.