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Tentative for a eatch-a-sketch 4k

How to build the demo

bndbuild.yml is the configuration file that describes how to construct the demo. See https://cpcsdk.github.io/rust.cpclib/bndbuild/ for more documentation.

  • sna is a target to make a quick build that test if everything workds properly. It generates a snapshot
  • etch4k is a target to make a slower build that compresses the demo and checks if it fits in 4k. It generates a snapshot but also update the etch4k.dsk file

To build the compressed version

.\tools\bndbuild etch4k

This is veeeerrrrryyy loooong to assemble, even on a beast. My assembler is fucking slow on the macro interpretation side and everything relies on hundred of thousands of tiny macro use. I am not sure to be able to improve that during the project. This is the reason why I individually assemble each image.

From scratch it takes 52min on my powerfull Linux machine. if there is no path computation but all code to assemble it takes <1min.

To cleanup the folder

.\tools\bndbuild.exe distclean

BUT be prepared to WAIT A LOT after to rebuild everything

How to add an image

Take inspiration to these rules in bndbuild.yml to understand how to add an image to convert.

These lines generate small_connex.asm from one PNG file

- tgt: small_connex.asm
  dep: convert/small_connex.png
  cmd: extern ./tools/convert --euclidean convert/small_connex.png small_connex.asm
- tgt: small_connex.o
  dep: small_connex.asm
  cmd: basm -I src small_connex.asm -o small_connex.o

These lines generate multiple.asm` from several png file

- tgt: multiple.asm
  dep: convert/puzzle1.png convert/puzzle2.png convert/puzzle3.png
  cmd: extern ./tools/convert --euclidean convert/puzzle1.png convert/puzzle2.png convert/puzzle3.png multiple.asm
- tgt: multiple.o
  dep: multiple.asm
  cmd: basm -I src multiple.asm -o multiple.o

In src\main.asm the list of pictures to draw is set up this way

picture1
	incbin "small_connex.o"
picture2
	incbin "title.o"
picture3
	incbin "multiple.o"

so just give a label and use incbin "file.o to include the picture stored in file.o

The display order is also set up in src\main.asm

unaligned_data
.pictures
	dw picture1
	dw picture2
	dw picture3
	dw 00

just add dw new_label to include a new image in the list

How to test

You can test with :

For the compressed version type RUN"ETCH4K and wait a while during uncrunch of the demo. uncompressed version is way faster to start

Current Limitations

  • OSCC + My Flat TV does not like the screen erasing part. SCreen is black. Need to be able to disable taht at last minute if revision people have the same issue