Subject: RE: [stella] bBasic feature requests / 0.3a teaser From: "Fred Quimby" <c9r@xxxxxxxxxxx> Date: Fri, 19 Aug 2005 07:29:57 -0400 |
>There is a way to define a sprite shape. It's nice >that sprites can be any size rather than just 8 >scanlines. However, I don't see any way to animate >sprites without simulating some kind of massive >switch-case construct. Could there be a way to define >arbitrary shapes and then just point the sprite to the >data? That would mean the kernel would have to do >indirect loading. The kernel does indirect loading of sprite data. You can use on..goto as a pretty effective switch statement without needing to simulate it, and the playerx: command will set the pointers. I guess you are talking about putting the pointers into a table so you can access them in an array instead of using the lengthy on..goto. >45 playfield: There has been talk about this on AA, but for some reason it didn't make into my todo list. I'm on the verge of releasing 0.3a now so I'll put it on the list for 0.4a or later. All I need to do before I release 0.3a is integrate Bob Montgomery's multisprite kernel (been putting this for the last thing because I think it's gonna be tough.) As a teaser, this is what has already been added and will be in the upcoming release: 8.8 and 4.4 fixed point types automatic conversion from one type to another in assignments addition/subtraction routines do automatic conversion if multiple types are used immediate decimal numbers allowed, either negative or positive 8.8 types can be used wherever integers are used 4.4 can't be used anywhere but can be added/subtracted/assigned to other types data statement length keyword remove trailing commas from data statements set optimization for size/speed full divide/multiply optional: multiply can produce a16-bit result or divide can produce remainder bit operations - assign one bit to another for-next loop bug fixed (foward loops by step >1 ended too soon) "else" allowed in if-thens Able to set the filename of variable alias file set ROM size to 2k or 4k smartbranching now accessed via set instead of rem REFPX bug fixed uses includes file for spcifying kernels and organizing modules include additional modules with include command pfread function (determine if pixel is off or on) fixed bug in decreasing for-next loops function declaration for user functions: functions can be in bB or asm optinally can be compiled separately and included as modules score=score+ var now supports vars other than a-z fixed bugs in if-thens for bit reads longer variable names allowed (50 chars max.) allow arrays as arguments in all functions (in user functions or built-in fns like pfpixel) improved error handling/reporting: more descriptive errors line in file now echoed const statement for defining constants optimized code fixed < and > comparisons, and added <= and >= fixed collision checks used lex to help with parsing/preprocessing score=score-1 bug fixed fixed bogus gosub/return errors on...goto now allows labels instead of just linenumbers allow negative numbers in code Don't get too excited though, as all this stuff will probably introduces new bugs, as I haven't been able to test everything thoroughly... Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://stella.biglist.com
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