From cdf10766edf1e6e1e15f3b080f91cb6310d94eb3 Mon Sep 17 00:00:00 2001
From: Evan Barger <epbarger@gmail.com>
Date: Mon, 18 Jan 2021 21:47:16 -0500
Subject: [PATCH] Add limited single game map support

---
 index.html      | 13 ++++++++++---
 script/app.js   | 26 +++++++++++++++++++++++++-
 script/gbnp.js  | 15 +++++++++------
 style/style.css |  8 ++++++++
 4 files changed, 52 insertions(+), 10 deletions(-)

diff --git a/index.html b/index.html
index 13bb12b..d2c970a 100644
--- a/index.html
+++ b/index.html
@@ -84,11 +84,11 @@
               <td></td>
               <td>{{ processor.romTotalKB() + 'k' }}</td>
               <td>{{ processor.ramUsedKB() + 'k' }}</td>
-              <td :class="{ overflow: romOverflow }">
+              <td :class="overflowClassMsg.class">
                 {{ processor.romUsedKB() / 128 + ' (' + processor.romUsedKB() + 'k)'}}
               </td>
-              <td :class="{ overflow: romOverflow }">
-                <span v-if="romOverflow">Limit is 7 blocks</span>
+              <td :class="overflowClassMsg.class">
+                <span v-if="overflowClassMsg.msg">{{overflowClassMsg.msg}}</span>
               </td>
               <td></td>
             </tr>
@@ -169,6 +169,13 @@
         <a class='download-link' :download="filename + '.gb'" :href="downloadEnabled ? romData : null" type="application/octet-stream" v-on:click="downloadRomFile" :class="{ disabled: !downloadEnabled }">Download ROM File ({{filename}}.gb)</a>
         <br>
         <a class='download-link' v-if="mapEnabled" :download="filename + '.map'" :href="downloadEnabled ? mapData : null" type="application/octet-stream" v-on:click="downloadMapFile" :class="{ disabled: !downloadEnabled }">Download MAP File ({{filename}}.map)</a>
+
+        <div v-if="singleRomMapEnabled" class="single-rom-download">
+          <div>If you want to flash {{singleRomFilename}} without the menu, you can use this MAP file to configure the cart to work with your ROM.</div>
+          <a class='download-link' :download="singleRomFilename + '.map'" :href="singleRomMapData" type="application/octet-stream" v-on:click="downloadSingleRomMapFile">
+            Download Single Game MAP File ({{singleRomFilename}}.map)
+          </a>
+        </div>
       </section>
     </div>
 
diff --git a/script/app.js b/script/app.js
index aaa3899..9fd12b3 100644
--- a/script/app.js
+++ b/script/app.js
@@ -71,6 +71,7 @@ let app = new Vue({
     filename: 'GBNP',
     mapData: '',
     romData: '',
+    singleRomMapData: '',
     fontIndex: 0,
     forceDMG: false,
     englishPatch: false,
@@ -96,7 +97,23 @@ let app = new Vue({
     mapEnabled: function() {
       return this.cartType == 0;
     },
-    romOverflow: function() { return this.processor.romOverflow(); }
+    romOverflow: function() { return this.processor.romOverflow(); },
+    overflowClassMsg: function() {
+      if (this.processor.roms.length === 1 && this.processor.roms[0].paddedRomSizeKB() === 1024) {
+        return { class: 'single-rom', msg: "Game only (no menu)" };
+      } else if (this.romOverflow) {
+        return { class: 'overflow', msg: "Limit is 7 blocks" };
+      }
+      return { class: null, msg: null };
+    },
+    singleRomMapEnabled: function() {
+      return this.mapEnabled
+        && this.processor.roms.length === 1
+        && this.processor.roms[0].paddedRomSizeKB() <= 1024;
+    },
+    singleRomFilename: function() {
+      return this.processor.roms[0] ? this.processor.roms[0].title : '';
+    }
   },
   watch: {
     roms: function() { this.processor.roms = this.roms; },
@@ -169,6 +186,13 @@ let app = new Vue({
         this.mapData = URL.createObjectURL(new Blob([this.processor.mapData()]));
       }
     },
+    downloadSingleRomMapFile: function(e) {
+      this.processor.roms = this.roms; // in case they got out of sync
+      if (this.cartType == 0) { // regular power cart only
+        if (this.singleRomMapData) { URL.revokeObjectURL(this.singleRomMapData) }
+        this.singleRomMapData = URL.createObjectURL(new Blob([this.processor.mapData(true)]));
+      }
+    },
     downloadRomFile: function(e) {
       this.processor.roms = this.roms; // in case they got out of sync
       if (this.romData) { URL.revokeObjectURL(this.romData) }
diff --git a/script/gbnp.js b/script/gbnp.js
index e2f1153..bd6e0e1 100644
--- a/script/gbnp.js
+++ b/script/gbnp.js
@@ -239,17 +239,20 @@ class Processor {
     return (this.romUsedKB() > 896);
   }
 
-  mapData() {
+  mapData(singleRom = false) {
     const mapBuffer = new ArrayBuffer(128);
     const mapFile = new FileSeeker(mapBuffer);
 
-    // write mbc type, rom size, and ram size for menu
-    mapFile.writeBytes([0xA8, 0, 0]);
-
-    // write mbc type, rom size, and ram size for each rom
-    let romOffset = 128;
+    let romOffset = 0;
     let ramOffset = 0;
 
+    if (!singleRom) {
+      // write mbc type, rom size, and ram size for menu
+      mapFile.writeBytes([0xA8, 0, 0]);
+      romOffset += 128;
+    }
+
+    // write mbc type, rom size, and ram size for each rom
     for (let i = 0; i < this.roms.length; i++) {
       let rom = this.roms[i];
       let bits = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0] // 16
diff --git a/style/style.css b/style/style.css
index e5e849e..be8743f 100644
--- a/style/style.css
+++ b/style/style.css
@@ -129,6 +129,10 @@ td.overflow {
   background-color: red;
 }
 
+td.single-rom {
+  background-color: orange;
+}
+
 thead tr {
   border-bottom: 1px solid #ddd;
 }
@@ -215,3 +219,7 @@ noscript {
   min-width: 250px;
   margin-right: 20px;
 }
+
+.single-rom-download {
+  margin-top: 1.5rem;
+}