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Posts posted by Yazwho

  1. On 6/13/2022 at 7:48 PM, svenvandevelde said:

    Thank you sir. Interesting concept using two layers. Would it also work with isomeric tiles that are 30⁰ over 30⁰ instead 45⁰ over 45⁰?

    Aye, you need to shift each the layer by the difference of the height of the tile and the height of the graphic using a line interrupt.

  2. For simple isometric playfields I'd use two tile layers, one for each row of tiles.

    Each tile is a graphic in a diamond shape so they can be linked as you'd imagine an isometric display would be.

    The layers are then offset by half a tile, so they interlock as below.

    The green tiles could include imagery that overlaps the red tiles, so you could create some pretty landscapes easily.

    If you want to get fancy then you can switch the layers using line interrupts on lines that are half way through a tileset. This would mean red tiles can also be above the green.

    Below are 16x16, but you could of course do 16x8 or 8x8 or use line interrupts for other smaller dimensions, depending on how you want it to look.


  3. On 5/5/2022 at 2:10 PM, epsilon537 said:

    If I may ask, where do you hang out online for Amiga development, and what's your target? UAE, an actual Amiga...?

    I've been looking into the Amiga design while doing research for my BoxLambda project, and the more I look at it, the more I like it: The bitplane concept, the Copper, the Blitter are all very cool, and those are just the pieces I had a chance to look at.

    I'm on the 'Official Commodore Amiga' discord, which is a good place to ask questions. ( https://discord.gg/MQ6Mfwk ) The 'English Amiga Board' is also a good resource. ( http://eab.abime.net/index.php )

    I'm using VSC with the Amiga Assembly extension to compile with vasm and run (+debug) in WinUAE. I have an A500 and 1200, but no small monitor right now, when I pick one up I'll use those for final testing.

    The copper and the blitter are where I started as well. Both are very interesting to code against. Didn't take long to knock up the app below. (Its animated, so looks a bit better than below!)

    While the X16 doesn't need such systems, it's a shame it doesn't have them. It makes developing for the system so much more interesting.


    • Like 1
  4. I've added code to the image library to take an image and turn it into tiles. Eg, the following code takes logo.png and turns it into 1bpp tiles, and adds a full tile so we know it will be tile #1. (tile #0 is empty and is always added by setting a parameter)

    public class Logo
        private TileData? _tileData = null;
        public void LoadLogo()
            var image  = ImageProcessor.Processor.LoadImage(@"logo.png");
            // flip pixels
            for(var i = 0; i < image.Pixels.Count(); i++)
                image.Pixels = image.Pixels == 0 ? (byte)1 : (byte)0;
            // add a full set so we know it will be in position #1
            var toAdd = new Tile(8, 8, Depth.Bpp_1);
            for(var x = 0; x < 8; x++)
                for(var y = 0; y < 8; y++)
                    toAdd.Pixels[x, y] = 1;
            _tileData = ImageProcessor.Processor.CreateTileMap(image, ImageProcessor.Depth.Bpp_1, ImageProcessor.TileSize.Size_8, ImageProcessor.TileSize.Size_8, false, true, ImageProcessor.TileExcessHandling.Error, new [] { toAdd });
        public IEnumerable<byte> TileMapData()
            foreach(var m in _tileData.Map)
                yield return m.Index;
                yield return 0x01;
        public IEnumerable<byte> TileData()
            foreach(var tile in _tileData.Tiles)
                foreach(var b in tile.Data())
                    yield return b;
        public int Height => _tileData.MapHeight;
        public int Width => _tileData.MapWidth;

    This can then be used:

    VideoMemory.Copy("tiles", 0x2000, logo.TileData().Count());


        BM.Bytes(logo.TileData(), 8);


    However, I'm going to stop development on the X16 bits while I concentrate on the developing for the Amiga. I'm sure I'll pick this back up at some point, although mostly to generalise the macro compiler to other chipsets -- namely the 68000 -- and to remove the basic X16 emulator to retarget the project in a more general direction.



  5. The assembler part now supports embedded procs, and correctly scopes them. (Scopes set with the .scope command still work in the same way.)

    The end of the proc is also tagged with a constant called 'endproc' if a definition with that name doesn't exist.

    One thing to note, referencing constants that are defined later in the file will always be assumed to be 16bit, so defined 8 bit ones earlier in the file. This is important for commands like lda to get the right opcode.

    All of this is demonstrated below:

    .machine CommanderX16R40;
    .const a = $01
    .proc proca
        .const a = $02
        lda #a          ; $02
        ;lda #procb:a   ; $03   doesn't work yet
        lda procb:b     ; $1234
        .proc procb
            .const a = $03
            .const b = $1234
            lda #a      ; $03
        lda #a          ; $02
        lda #procb:a    ; $03
    lda #a

    With the output:

    $0801:  $A9, $02              LDA       #a
    $0803:* $AD, $CD, $AB   LDA       procb:b
    $0806:  $A9, $03              LDA       #a
    $0808:  $A9, $02              LDA       #a
    $080A:  $A9, $03              LDA       #procb:a
    $080C:  $A9, $01              LDA       #a
    $0803:  $AD, $34, $12     LDA       procb:b

    and the constants:

    App:Main:a = $01
    App:Main:proca = $801
    App:Main:proca:a = $02
    App:Main:proca:procb = $806
    App:Main:proca:endproc = $80C
    App:Main:proca:procb:a = $03
    App:Main:proca:procb:b = $1234
    App:Main:proca:procb:endproc = $808




  6. If no one is going to take an income from it then it should definitely be 'Non profit', for the tax and licensing breaks at the very least.

    As you can see from the recent posts financing isn't the problem. It appears to be a mix of technical and managerial problems.

    Of course supporting content creators is a good thing, but dont think sending money now will hurry up this particular project.

  7. In an attempt to be more generic I've added the ability to target individual 'machines'. The only two so far implemented are the X16 R38 and R39, but hopefully I'll add more later. (The ability to target just a CPU is on the todo list, eg 6502 or 65c02.)

    This gives us a handy feature, in that we can check the version in both libraries and the main csasm file as the Template Engine constructs the bmasm file.

    For example:

            if (BM.Machine.Name == "CommanderX16")
                if (BM.Machine.Version <= 38)
                    lda #38
                    lda #39
                sta version

    A practical use would be switching look up tables for the YM2151.

    The machine you're building can be set in both the csasm and the bmasm.


    machine CommanderX16R38;


    .machine CommanderX16R38

    As an aside; a machine for the compilation is just a set of constants, so for example the rom bank switch location would be mapped correctly to the 'RAM_BANK' constant depending on if you target R38 or R39.

    • Thanks 1
  8. On 2/15/2022 at 1:28 PM, Jormundgand said:

    similar project on my own, but using a Motorola 68000, original DIP-64 version, instead of a 6502. So far, I'm still waiting for parts so nothing is working at all (I'm not even at the amateur stage of designing computers).

    That's certainly jumping in feet first!


  9. Introducing BitMagic!

    BitMagic is -- currently -- a macro assembler and a compiler for the X16, that utilises C# and the dotnet build chain to provide us with the ability to write macros to a much greater degree of complexity than offered by traditional assemblers. The ideal being that there will no longer be a need to write external applications to construct what we're trying to do, especially with assets.

    There are a few things to do, most importantly implement any missing 65c02 opcodes, but it is nearing a usable state so it felt like the right time to at least share.

    Instead of cut/pasting the text on the GitHub repository, you can read all about it here.

    However, an picture is worth a thousand words, so as an example here is the code for this downloadable demo. It is assembler -- honest!

    assembly "..\..\Libraries\Compression\bin\Debug\net6.0\Compression.dll";
    assembly "..\..\Libraries\ImageProcessor\bin\Debug\net6.0\ImageProcessor.dll";
    assembly "..\..\Libraries\Vera\bin\Debug\net6.0\Vera.dll";
    using Compression;
    using ImageProcessor;
    using Vera;
        BM.X16Header(); // byte code to start execution.
        VideoMemory.SetCopyZpWordAddress(0x00); // define where in ZP the copy can use.
        Inflator.SetSourceZp(0x00); // define where in ZP we can use for inflating.
        Video.Mode(Layers.None); // disable all layers and sprites while the image inflates.
        Video.Scaling(Resolution.Half); // 320x240
        Video.LayerBitmap(ConfigLayer.Layer0, Depth.Bpp_8, BitmapWidth.Half_320, 0x1000);
        ; in case colour 0 is not black!
        lda #$11
        sta ADDRx_H
        lda #$fa
        sta ADDRx_M
        stz ADDRx_L
        stz DATA0
        stz DATA0
        ; call decompress
        Inflator.InflateToVram("compressed_data", 0x1000);
        var imageData = ImageAsset.LoadFullImage(@"Assets\bliss.bmp");
        ; copy palette to vera
        VideoMemory.Copy("palette", 0x1fa00, imageData.X16Colours.Length);
        Video.Mode(Layers.Layer0); // turn on layer 0 to show the image.
        ; infinite loop
            jmp loop
        Inflator.InflateToVramCode(); // decompressor proc code.
        VideoMemory.CopyProc(); // copy proc code.
        var compressed = Deflator.Deflate(imageData.Pixels);
        ; Source data is @(imageData.Pixels.Length) bytes.
        ; Compressed data is $@(compressed.Length.ToString("X4")) bytes.
        ; scratch space for decompression.
        .segment Variables, $400

    Thanks for reading, and I hope you find it at least interesting!

    • Like 3
    • Thanks 1
  10. On 2/10/2022 at 1:31 PM, kliepatsch said:

    Although composing by scripting in Python is definitely tedious

    Wow, that is some effort indeed! Good skill!

    Edit: Sounds awesome, like someone has poured the 80s into the air con! 😄

    • Like 1
  11. BitPlayer - Jan 2022

    View File

    Happy New Year all! Given the site is a bit slow, I thought I'd show off the latest version of my player.

    The biggest change in the latest version is that the commands now have 2 bytes of variable space to store their state, hopefully leading to some more interesting effects. You can hear an example with the 'warbling' on the track included. It's not vibrato by any stretch, but adds a little something. Hopefully you can hear the difference to the previous version here and agree its an improvement! (I am by no means a musician, so your mileage on that may vary!)

    The 'tracker', BitPlayer, that I'm using and developing is still relatively basic in terms of its UI, but is slowly but surely maturing. This uploaded .prg file is what is produced when the X16 emulator is launched from the tracker. It's all hosted on Gitlab here. The .json file attached is the 'mod'.

    There are of course a fair few things to do, the list is something like this:

    1. PCM support
    2. Change the output to my own new templating engine instead of ca65
    3. YM2151 support (X8 depending)
    4. Change the sound engine to use a common engine with the emulator that better represents the X16 - Probably by embedding a emulator directly into the application

    The new templating engine removes all the typical restrictions that 'macro assemblers' can have. It's written in c# and is currently based on the Razor engine. As such it's easy to embed within an application like BitPlayer to produce 65c02 asm. The engine and the compiler have a little way to go, but if you're interested there is more information here.

    The track was originally by Archyx and can be found here.



  12. Great stuff. 

    When browsing Amazon, its worth using smile.amazon.xx so Amazon give a fraction to a charity for every purchase! Even if you use smile.amazon.xxx a link to www.amazon.com won't auto forward without an extension ( I use https://chrome.google.com/webstore/detail/smile-always/jgpmhnmjbhgkhpbgelalfpplebgfjmbf )

    Unless you have some sort of referral, it's worth updating the links..?

    More info: https://smile.amazon.com/charity/smile/about

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