{"id":679,"date":"2016-08-20T21:20:09","date_gmt":"2016-08-20T21:20:09","guid":{"rendered":"https:\/\/astrofra.com\/wordpress\/?p=679"},"modified":"2016-08-20T21:20:09","modified_gmt":"2016-08-20T21:20:09","slug":"lua-remake-of-an-amiga-cracktro","status":"publish","type":"post","link":"https:\/\/astrofra.com\/wordpress\/index.php\/2016\/08\/20\/lua-remake-of-an-amiga-cracktro\/","title":{"rendered":"Lua remake of an Amiga cracktro"},"content":{"rendered":"

Recently, I wanted to test the Plus wrapper<\/a> of Harfang<\/a> on a simple project, and I found that I could try to remake an ancient Amiga <\/a>cracktro I used to enjoy back in the days.<\/p>\n

[youtube]https:\/\/www.youtube.com\/watch?v=NJjQM982S6s[\/youtube]<\/p>\n

Starfield!<\/strong>
\nThe starfield is a simple list of 3D points on which a vector is applied each frame, transformed from 3D to 2D and displayed using 2D sprites. The 3D to 2D projection works the usual way :
\n
\nx2d = (a.x * zoom) \/ a.z
\ny2d = (a.y * zoom) \/ a.z
\n<\/code><\/p>\n

There’s room for an optimization, as the whole list of sprites could be drawn as a unique batch. If more performance was needed, for several thousands of stars for example, DrawSpriteAuto() would really work faster.<\/p>\n

Music!<\/strong>
\nThe venerable ProTracker module, available on the Exotica archives, was converted to the XM format and replayed easily in Harfang, using the following instruction :<\/p>\n

al:Stream(\"assets\/unit5.xm\")<\/code><\/p>\n

Let’s Scroll!<\/strong>
\nThe scroll text, finally, was made easy to render thanks to the Plus<\/em> wrapper, by blitting each glyph to the screen. The original font was grabbed from the original cracktro using a memory snapshot from the WinUAE emulator.<\/p>\n

Each glyph is then drawn, using :<\/p>\n

Blit2D()<\/code><\/p>\n

This remake is not 100% accurate as the scope of this project was more focused on using the Plus<\/em> wrapper than being in competition with the most excellent Flashtro<\/a> project.<\/p>\n

Here is the Win64<\/strong> release :
\nhttp:\/\/fra.planet-d.net\/prods\/Unit-A-Interceptor-Win64.zip<\/a><\/p>\n

Here is the source code on Github<\/strong> :
\nhttps:\/\/github.com\/astrofra\/harfang-lua-experiments\/tree\/master\/unit-a-interceptor-remake\/src<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Recently, I wanted to test the Plus wrapper of Harfang on a simple project, and I found that I could try to remake an ancient Amiga cracktro I used to enjoy back in the days. [youtube]https:\/\/www.youtube.com\/watch?v=NJjQM982S6s[\/youtube] Starfield! The starfield is a simple list of 3D points on which a vector is applied each frame, transformed … Continue reading Lua remake of an Amiga cracktro<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,5],"tags":[],"class_list":["post-679","post","type-post","status-publish","format-standard","hentry","category-demoscene","category-prog"],"_links":{"self":[{"href":"https:\/\/astrofra.com\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/679"}],"collection":[{"href":"https:\/\/astrofra.com\/wordpress\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/astrofra.com\/wordpress\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/astrofra.com\/wordpress\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/astrofra.com\/wordpress\/index.php\/wp-json\/wp\/v2\/comments?post=679"}],"version-history":[{"count":1,"href":"https:\/\/astrofra.com\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/679\/revisions"}],"predecessor-version":[{"id":680,"href":"https:\/\/astrofra.com\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/679\/revisions\/680"}],"wp:attachment":[{"href":"https:\/\/astrofra.com\/wordpress\/index.php\/wp-json\/wp\/v2\/media?parent=679"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/astrofra.com\/wordpress\/index.php\/wp-json\/wp\/v2\/categories?post=679"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/astrofra.com\/wordpress\/index.php\/wp-json\/wp\/v2\/tags?post=679"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}