feat: borrow buffer

zss/bios/index.ts

@@ -41,7 +41,7 @@ export const BIOS = createbook('BIOS', [
     object: {
       char: 15,
       color: COLOR.WHITE,
-      bg: COLOR.BLACK,
+      bg: COLOR.BORROW,
     },
   }),
   createcodepage(bulletcode, {
@@ -55,14 +55,14 @@ export const BIOS = createbook('BIOS', [
     object: {
       char: 219,
       color: COLOR.WHITE,
-      bg: COLOR.CLEAR,
+      bg: COLOR.BORROW,
     },
   }),
   createcodepage(spincode, {
     object: {
       char: 1,
       color: COLOR.WHITE,
-      bg: COLOR.CLEAR,
+      bg: COLOR.BORROW,
     },
   }),
   createcodepage('@terrain bimp\n@destructible', {

zss/chip.ts

@@ -6,7 +6,7 @@ import { hub } from './hub'
 import { GeneratorBuild } from './lang/generator'
 import { GENERATED_FILENAME } from './lang/transformer'
 import { CYCLE_DEFAULT } from './mapping/tick'
-import { deepcopy, isequal, isstring } from './mapping/types'
+import { MAYBE, deepcopy, isequal, ispresent, isstring } from './mapping/types'
 
 export const HALT_AT_COUNT = 64
 
@@ -26,7 +26,7 @@ export type CHIP = {
   id: () => string
 
   // set firmware on chip
-  install: (firmware: FIRMWARE) => void
+  install: (firmware: MAYBE<FIRMWARE>) => void
 
   // state api
   set: (name: string, value: any) => any
@@ -167,6 +167,9 @@ export function createchip(id: string, build: GeneratorBuild) {
 
     // invokes api
     install(firmware) {
+      if (!ispresent(firmware)) {
+        return
+      }
       // clear invoke cache
       invokes = {}
       // add firmware

zss/firmware/loader.ts

@@ -9,9 +9,8 @@ const firmwares: Record<string, FIRMWARE> = {
   zss: ZSS_FIRMWARE,
 }
 
-export function loadfirmware(chip: CHIP) {
-  // todo, add target codepage type here ...
-  Object.values(firmwares).forEach((firmware) => {
-    chip.install(firmware)
-  })
+export type FIRMWARE_NAME = keyof typeof firmwares
+
+export function loadfirmware(chip: CHIP, items: FIRMWARE_NAME[]) {
+  items.forEach((name) => chip.install(firmwares[name]))
 }

zss/firmware/wordtypes.ts

@@ -61,8 +61,10 @@ export enum COLOR {
   ONPURPLE,
   ONYELLOW,
   ONWHITE,
+  // special bg colors
   CLEAR = COLOR_TINDEX,
   SHADOW = COLOR_SINDEX,
+  BORROW = COLOR_SINDEX + 1,
 }
 
 export enum DIR {
@@ -289,6 +291,7 @@ export const colorconsts = {
   white: 'WHITE',
   clear: 'CLEAR',
   shadow: 'SHADOW',
+  borrow: 'BORROW',
   // aliases
   brown: 'DKYELLOW',
   dkwhite: 'LTGRAY',

zss/gadget/display/sprites.ts

@@ -54,7 +54,7 @@ const spritesMaterial = new THREE.ShaderMaterial({
     vec4 empty;
 
     vec4 bgFromIndex(float index) {
-      if (int(index) <= ${COLOR_TINDEX}) {
+      if (int(index) >= ${COLOR_TINDEX}) {
         return empty;
       }
       vec4 bg;

zss/memory/index.ts

@@ -191,7 +191,7 @@ export function memorytick(os: OS, timestamp: number) {
     context.target = target
     context.inputcurrent = undefined
     // run chip code
-    os.tick(id, timestamp, code)
+    os.tick(id, timestamp, code, ['zss', 'zzt'])
   }
 
   // update boards / build code / run chips
@@ -207,6 +207,7 @@ function memoryconverttogadgetlayers(
   book: BOOK,
   board: BOARD,
   isprimary: boolean,
+  borrowbuffer: number[],
 ): LAYER[] {
   const layers: LAYER[] = []
 
@@ -238,6 +239,8 @@ function memoryconverttogadgetlayers(
       tiles.char[i] = tile.char ?? kind?.char ?? 0
       tiles.color[i] = tile.color ?? kind?.color ?? defaultcolor
       tiles.bg[i] = tile.bg ?? kind?.bg ?? defaultcolor
+      // write to borrow buffer
+      borrowbuffer[i] = tiles.color[i]
     }
   })
 
@@ -254,6 +257,7 @@ function memoryconverttogadgetlayers(
     const sprite = createsprite(player, objectindex, id)
     const lx = object.lx ?? object.x ?? 0
     const ly = object.ly ?? object.y ?? 0
+    const li = lx + ly * board.width
 
     // setup sprite
     sprite.x = object.x ?? 0
@@ -264,11 +268,19 @@ function memoryconverttogadgetlayers(
     objects.sprites.push(sprite)
 
     // plot shadow
-    if (sprite.bg === COLOR.SHADOW) {
+    if (sprite.bg === (COLOR.SHADOW as number)) {
       sprite.bg = COLOR.CLEAR
       shadow.alphas[lx + ly * boardwidth] = 0.5
     }
 
+    // borrow color
+    if (sprite.bg === (COLOR.BORROW as number)) {
+      sprite.bg = borrowbuffer[li] ?? COLOR.BLACK
+    }
+
+    // write to borrow buffer
+    borrowbuffer[li] = sprite.color
+
     // inform control layer where to focus
     if (id === player) {
       control.focusx = sprite.x
@@ -372,6 +384,8 @@ export function memoryreadgadgetlayers(player: string): LAYER[] {
 
   let i = 0
   const frames = [...memoryreadframes(board.id ?? '')]
+  const borrowbuffer: number[] = new Array(board.width * board.height).fill(0)
+
   frames.sort((a, b) => framerank(a) - framerank(b))
   frames.forEach((frame) => {
     const withbook = memoryreadbook(frame.book ?? '') ?? book
@@ -383,6 +397,7 @@ export function memoryreadgadgetlayers(player: string): LAYER[] {
         withbook,
         withboard,
         frame.type === FRAME_TYPE.VIEW,
+        borrowbuffer,
       )
       i += view.length
       layers.push(...view)

zss/os.ts

@@ -1,14 +1,19 @@
 import { CHIP, createchip } from './chip'
 import { MESSAGE_FUNC, parsetarget } from './device'
-import { loadfirmware } from './firmware/loader'
+import { FIRMWARE_NAME, loadfirmware } from './firmware/loader'
 import { GeneratorBuild, compile } from './lang/generator'
 import { ispresent } from './mapping/types'
 
 export type OS = {
   ids: () => string[]
   has: (id: string) => boolean
   halt: (id: string) => boolean
-  tick: (id: string, timestamp: number, code: string) => boolean
+  tick: (
+    id: string,
+    timestamp: number,
+    code: string,
+    firmwares: FIRMWARE_NAME[],
+  ) => boolean
   message: MESSAGE_FUNC
 }
 
@@ -42,7 +47,7 @@ export function createos() {
       }
       return !!chip
     },
-    tick(id, timestamp, code) {
+    tick(id, timestamp, code, firmwares) {
       let chip = chips[id]
 
       if (!ispresent(chips[id])) {
@@ -58,7 +63,7 @@ export function createos() {
         chip = chips[id] = createchip(id, result)
 
         // load chip firmware
-        loadfirmware(chip)
+        loadfirmware(chip, firmwares)
       }
 
       return !!chip?.tick(timestamp)

zss/terminal/crt.tsx

@@ -48,8 +48,8 @@ void mainImage(const in vec4 inputColor, const in vec2 uv, out vec4 outputColor)
   } else {  
     outputColor = texture2D(inputBuffer, bent);
     // apply inner shade
-    float sh = clamp(0.0, 1.0, 1.0 - bx - 0.5);
-    vec3 shade = mix(outputColor.rgb, vec3(0.0), pow(sh, 3.0));
+    float sh = clamp(0.0, 1.0, 1.0 - bx - 0.7);
+    vec3 shade = mix(outputColor.rgb, vec3(0.0), pow(sh, 4.0));
     outputColor = vec4(shade, inputColor.a);
   }