Correction for negative affine parallax

Reviewed-on: #1

core/cpu.c

@@ -234,7 +234,7 @@ static int cpuOnExecute(VB *sim) {
     #define VB_ON_READ VB_DIRECT_READ
 #endif
 static int cpuRead(VB *sim, uint32_t address, int type, int32_t *value) {
-    uint32_t cycles = 4; /* TODO: Research this */
+    uint32_t cycles = 0; /* TODO: Research this */
 
     /* Retrieve the value from the simulation state directly */
     busRead(sim, address, type, value);
@@ -289,7 +289,7 @@ static int cpuReadFetch(VB *sim, int fetch, uint32_t address, int32_t *value) {
 #endif
 static int cpuWrite(VB *sim, uint32_t address, int type, int32_t value) {
     int      cancel = 0;
-    uint32_t cycles = 3; /* TODO: Research this */
+    uint32_t cycles = 0; /* TODO: Research this */
 
     /* Reset pseudo-halt */
     if (sim->ph.enabled)
@@ -495,7 +495,7 @@ static int cpuException(VB *sim) {
         sim->cpu.eipc     = sim->cpu.pc;
         sim->cpu.psw.ep   = 1;
         sim->cpu.nextPC   = 0xFFFF0000 |
-            ((cause & 0xFFF0) == 0xFF60 ? 0xFF60 : cause & 0xFFF0);
+            ((cause & 0xFFF0) == 0xFF70 ? 0xFF60 : cause & 0xFFF0);
     }
 
     /* All exceptions */

core/vb.c

@@ -900,7 +900,7 @@ VBAPI vbOnWrite vbSetWriteCallback(VB *sim, vbOnWrite callback) {
 }
 
 /* Determine the size of a simulation instance */
-VBAPI size_t vbSizeOf() {
+VBAPI size_t vbSizeOf(void) {
     return sizeof (VB);
 }
 

core/vb.h

@@ -166,7 +166,7 @@ VBAPI vbOnSamples   vbSetSamplesCallback  (VB *sim, vbOnSamples callback);
 VBAPI uint32_t      vbSetSystemRegister   (VB *sim, unsigned index, uint32_t value);
 VBAPI void*         vbSetUserData         (VB *sim, void *tag);
 VBAPI vbOnWrite     vbSetWriteCallback    (VB *sim, vbOnWrite callback);
-VBAPI size_t        vbSizeOf              ();
+VBAPI size_t        vbSizeOf              (void);
 VBAPI int32_t       vbWrite               (VB *sim, uint32_t address, int type, int32_t value);
 
 

core/vip.c

@@ -41,16 +41,17 @@ static const uint8_t BG_TEMPLATES[][64] = {
 };
 
 /* 8-bit color magnitude by brightness level */
+/* Generated as BRIGHT8[n] = round((n / 132) ** 1.6 * 255) */
 static const uint8_t BRIGHT8[] = {
-      0,  1,  3,  5,  7,  9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 28,
+      0, 12, 19, 24, 29, 33, 37, 41, 44, 48, 51, 54, 57, 60, 63, 65,
-     30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 57, 59,
+     68, 71, 73, 76, 78, 81, 83, 86, 88, 90, 92, 95, 97, 99,101,103,
-     61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 86, 88, 90,
+    105,107,109,111,113,115,117,119,121,123,125,127,128,130,132,134,
-     92, 94, 96, 98,100,102,104,106,108,110,112,113,115,117,119,121,
+    136,137,139,141,142,144,146,148,149,151,153,154,156,157,159,161,
-    123,125,127,129,131,133,135,137,139,141,142,144,146,148,150,152,
+    162,164,165,167,168,170,172,173,175,176,178,179,181,182,184,185,
-    154,156,158,160,162,164,166,168,170,171,173,175,177,179,181,183,
+    186,188,189,191,192,194,195,197,198,199,201,202,203,205,206,208,
-    185,187,189,191,193,195,197,198,200,202,204,206,208,210,212,214,
+    209,210,212,213,214,216,217,218,220,221,222,224,225,226,228,229,
-    216,218,220,222,224,226,227,229,231,233,235,237,239,241,243,245,
+    230,231,233,234,235,236,238,239,240,242,243,244,245,246,248,249,
-    247,249,251,253,255
+    250,251,253,254,255
 };
 
 
@@ -984,7 +985,7 @@ static void vipDrawHBias(VB *sim, World *world) {
         /* Process all visible lines */
         param = &sim->vip.ram[world->paramBase +
             ((y1 - world->gy) << 2) + (i << 1)];
-        for (y = y1; y < y2; y++, param += 2) {
+        for (y = y1; y < y2; y++, param += 4) {
 
             /* Configure window bounds */
             wnd.y1 = y;
@@ -992,7 +993,7 @@ static void vipDrawHBias(VB *sim, World *world) {
 
             /* Draw the background into the window */
             vipDrawBackground(sim->vip.shadow[i], &wnd, world,
-                mx + busReadBuffer(param, VB_S16), my);
+                mx - busReadBuffer(param, VB_S16), my);
         }
 
     }
@@ -1004,7 +1005,7 @@ static void vipDrawAffine(VB *sim, World *world) {
     Cell    *cell;               /* Source cell */
     uint8_t *col, *row;          /* Output pixel */
     uint8_t  pixel;              /* Character pixel value */
-    uint8_t *param;              /* World parameter memory */
+    uint32_t param;              /* World parameter memory */
     int32_t  px, py;             /* Pixel source coordinates */
     int32_t  dx, dy, mp, mx, my; /* Affine parameters */
     int32_t  wx;                 /* Base world X coordinate */
@@ -1051,21 +1052,26 @@ static void vipDrawAffine(VB *sim, World *world) {
         wx = x1 - wx;
 
         /* Process all visible rows */
-        param = &sim->vip.ram[world->paramBase | (y1 - world->gy) << 4];
+        param = world->paramBase + ((y1 - world->gy) << 4);
         row   = &sim->vip.shadow[i][x1 * 224 + y1];
         for (y = y1; y < y2; y++, param += 16, row++) {
 
             /* Parse line parameters */
-            mx = (int32_t) busReadBuffer(param + 0, VB_S16) << 6;
+            mx = (int32_t) busReadBuffer(&sim->vip.ram[param | 0], VB_S16) << 6;
-            mp = (int32_t) busReadBuffer(param + 2, VB_S16);
+            mp = (int32_t) busReadBuffer(&sim->vip.ram[param | 2], VB_S16);
-            my = (int32_t) busReadBuffer(param + 4, VB_S16) << 6;
+            my = (int32_t) busReadBuffer(&sim->vip.ram[param | 4], VB_S16) << 6;
-            dx = (int32_t) busReadBuffer(param + 6, VB_S16);
+            dx = (int32_t) busReadBuffer(&sim->vip.ram[param | 6], VB_S16);
-            dy = (int32_t) busReadBuffer(param + 8, VB_S16);
+            dy = (int32_t) busReadBuffer(&sim->vip.ram[param | 8], VB_S16);
 
             /* Adjust left-edge parameters */
             if ((mp < 0) ^ i) {
-                mx += dx * (wx + mp);
+                if (mp < 0) {
-                my += dy * (wx + mp);
+                    mx += dx * (wx - mp);
+                    my += dy * (wx - mp);
+                } else {
+                    mx += dx * (wx + mp);
+                    my += dy * (wx + mp);
+                }
             } else {
                 mx += dx * wx;
                 my += dy * wx;

core/vsu.c

@@ -132,14 +132,19 @@ static void vsuEmulateChannel(VB *sim, Channel *chan) {
     }
 
     /* Envelope modification */
-    if (chan->env.enb && !chan->env.modmask && chan->env.clocks == 0) {
+    if (chan->env.clocks == 0) {
+        uint8_t new_envelope = chan->env.value;
         if (chan->env.dir == 0 && chan->env.value != 0)
-            chan->env.value--;
+            new_envelope--;
         else if (chan->env.dir == 1 && chan->env.value != 15)
-            chan->env.value++;
+            new_envelope++;
-        else if (chan->env.rep)
+        else if (chan->env.rep && chan->env.modmask != 2) {
-            chan->env.value = chan->env.reload;
+            new_envelope = chan->env.reload;
-        else chan->env.modmask = 1;
+            chan->env.modmask = 0;
+        } else if (!chan->env.modmask)
+            chan->env.modmask = 1;
+        if (chan->env.enb && !chan->env.modmask)
+            chan->env.value = new_envelope;
         chan->env.clocks = ((uint32_t) chan->env.interval + 1) * 307220;
     }
 
@@ -215,6 +220,7 @@ static void vsuWriteEV0(VB *sim, int index, uint8_t value) {
     chan->env.interval = value      &  7;
     chan->env.value    = value >> 4 & 15;
     chan->env.reload   = chan->env.value;
+    if (chan->env.modmask == 1) chan->env.modmask = 2;
     if (index == 4) {
         chan->freqmod = vsuCheckFreqMod(sim);
         vsuNextFreqMod(sim, chan);
@@ -231,6 +237,12 @@ static void vsuWriteEV1(VB *sim, int index, uint8_t value) {
     /* Parse fields */
     chan->env.enb = value      & 1;
     chan->env.rep = value >> 1 & 1;
+    if (
+        !chan->env.rep && (
+            (chan->env.reload ==  0 && chan->env.dir == 0) ||
+            (chan->env.reload == 15 && chan->env.dir == 1)
+        )
+    ) chan->env.modmask = 1;
 
     /* Processing by channel */
     switch (index) {
@@ -286,8 +298,13 @@ static void vsuWriteINT(VB *sim, int index, uint8_t value) {
     /* Update state */
     chan->int_.clocks = 76805 * ((uint32_t) chan->int_.interval + 1);
     chan->env.modmask = 0;
-    if (chan->env.enb)
+    if (
-        chan->env.clocks = 307220 * ((uint32_t) chan->env.interval + 1);
+        !chan->env.rep && (
+            (chan->env.reload ==  0 && chan->env.dir == 0) ||
+            (chan->env.reload == 15 && chan->env.dir == 1)
+        )
+    ) chan->env.modmask = 1;
+    chan->env.clocks = 307220 * ((uint32_t) chan->env.interval + 1);
     if (index != 5) {
         chan->wave.sample = 0;
         chan->clocks =  4 * (2048 - (uint32_t) chan->freq.current);
@@ -377,7 +394,7 @@ static void vsuEmulate(VB *sim, uint32_t clocks) {
 
                     /* Clocks until next state change */
                     chan->until = chan->clocks;
-                    if (chan->env.enb && !chan->env.modmask &&
+                    if (chan->env.enb && chan->env.modmask != 2 &&
                         chan->env.clocks < chan->until)
                         chan->until = chan->env.clocks;
                     if (chan->int_.auto_ && chan->int_.clocks < chan->until)
@@ -387,7 +404,7 @@ static void vsuEmulate(VB *sim, uint32_t clocks) {
 
                     /* Manage clocks */
                     chan->clocks -= chan->until;
-                    if (chan->env.enb && !chan->env.modmask)
+                    if (chan->env.enb && chan->env.modmask != 2)
                         chan->env.clocks -= chan->until;
                     if (chan->int_.auto_)
                         chan->int_.clocks -= chan->until;
@@ -531,14 +548,7 @@ static void vsuReset(VB *sim) {
 
 /* Write a typed value to the VSU bus */
 static void vsuWrite(VB*sim,uint32_t address,int type,int32_t value,int debug){
-
+    (void) type;
-    /* Only byte writes are allowed */
-    switch (type) {
-        case VB_S16:
-        case VB_U16:
-        case VB_S32:
-            return;
-    }
 
     /* Unmapped */
     if (address & 1)

web/Core.js

@@ -293,6 +293,12 @@ new class Core {
         }, [ output.buffer ]);
     }
 
+    // Reset simulation state
+    reset(message) {
+        this.vbReset(message.sim);
+        this.dom.postMessage({ promised: true });
+    }
+
     // Specify anaglyph colors
     setAnaglyph(message) {
         this.SetAnaglyph(message.sim, message.left, message.right);

web/VB.js

@@ -436,8 +436,17 @@ class Sim extends HTMLElement {
             response.lines.map(l=>new DasmLine(GUARD, l));
     }
 
+    // Reset simulation state
+    reset() {
+        return this.#core.toCore({
+            command : "reset",
+            promised: true,
+            sim     : this.#pointer
+        });
+    }
+
     // Specify anaglyph colors
-    async setAnaglyph(left, right) {
+    setAnaglyph(left, right) {
 
         // Error checking
         if (!Number.isSafeInteger(left ) || left  < 0 || left  > 0xFFFFFF)
@@ -455,7 +464,7 @@ class Sim extends HTMLElement {
         this.#anaglyph[1] = right;
 
         // Send the colors to the core
-        await this.#core.toCore({
+        return this.#core.toCore({
             command : "setAnaglyph",
             promised: true,
             sim     : this.#pointer,
@@ -475,7 +484,7 @@ class Sim extends HTMLElement {
     }
 
     // Specify new game pad keys
-    async setKeys(keys) {
+    setKeys(keys) {
 
         // Error checking
         if (!Number.isSafeInteger(keys) || keys < 0 || keys > 0xFFFF)
@@ -487,7 +496,7 @@ class Sim extends HTMLElement {
         this.#keys = keys;
 
         // Send the keys to the core
-        await this.#core.toCore({
+        return this.#core.toCore({
             command : "setKeys",
             promised: true,
             sim     : this.#pointer,
@@ -496,7 +505,7 @@ class Sim extends HTMLElement {
     }
 
     // Specify audio panning
-    async setPanning(panning) {
+    setPanning(panning) {
 
         // Error checking
         if (!Number.isFinite(panning) ||panning < -1 || panning > +1) {
@@ -508,7 +517,7 @@ class Sim extends HTMLElement {
         this.#panning = panning;
 
         // Send the panning to the core
-        await this.#core.toCore({
+        return this.#core.toCore({
             command : "setPanning",
             promised: true,
             sim     : this.#pointer,
@@ -529,7 +538,7 @@ class Sim extends HTMLElement {
     }
 
     // Specify audio volume
-    async setVolume(volume) {
+    setVolume(volume) {
 
         // Error checking
         if (!Number.isFinite(volume) ||volume < 0 || volume > 10) {
@@ -541,7 +550,7 @@ class Sim extends HTMLElement {
         this.#volume = volume;
 
         // Send the volume to the core
-        await this.#core.toCore({
+        return this.#core.toCore({
             command : "setVolume",
             promised: true,
             sim     : this.#pointer,
@@ -596,7 +605,7 @@ class VB {
     #commands;  // Computed method table
     #core;      // Core worker
     #proxy;     // Self proxy for sim access
-    #sims;      // All sims
+    #sims;      // Mapping of Sim|pointer -> proxy
     #state;     // Operations state
 
 
@@ -683,8 +692,8 @@ class VB {
     ///////////////////////////// Static Methods //////////////////////////////
 
     // Create a core instance
-    static async create(options) {
+    static create(options) {
-        return await new VB(GUARD).#construct(options);
+        return new VB(GUARD).#construct(options);
     }
 
 
@@ -769,6 +778,16 @@ class VB {
 
 
 
+    /////////////////////////////// Properties ////////////////////////////////
+
+    // Number of managed simulations
+    get size() { return this.#sims.size / 2; }
+
+    // Managed simulations
+    get sims() { return [... this.#sims.keys()].filter(s=>s instanceof Sim); }
+
+
+
     ///////////////////////////// Public Methods //////////////////////////////
 
     // Create one or more sims
@@ -809,7 +828,7 @@ class VB {
         if (
             !Array.isArray(sims) ||
             sims.length == 0     ||
-            sims.find(s=>!this.#sims.has(s))
+            sims.some(s=>!this.#sims.has(s))
         ) {
             throw new TypeError("Must specify a Sim or array of Sims " +
                 "that belong to this core.");