Fixed screen blanking to no longer wipe all of graphics (#266)

* Set ups a nice breakpoint function for debugging.
* Fixes Screen wiping wiping all of our graphics in memory, including our internal stuff like our palettes.

Links Awakening DX Works again! 😄 🎉 

<img width="727" alt="screen shot 2019-02-23 at 3 30 14 am" src="https://user-images.githubusercontent.com/1448289/53285894-5c147500-371b-11e9-808c-e92b60f936d0.png">

Author: torch2424

core/debug/breakpoints.ts

@@ -6,6 +6,10 @@ export class Breakpoints {
   static reachedBreakpoint: boolean = false;
 }
 
+export function breakpoint(): void {
+  Breakpoints.reachedBreakpoint = true;
+}
+
 export function setProgramCounterBreakpoint(breakpoint: i32): void {
   Breakpoints.programCounter = breakpoint;
 }

core/graphics/lcd.ts

@@ -6,7 +6,7 @@ import { eightBitStoreIntoGBMemory } from '../memory/store';
 import { updateHblankHdma } from '../memory/index';
 import { requestLcdInterrupt, requestVBlankInterrupt } from '../interrupts/index';
 import { checkBitOnByte, setBitOnByte, resetBitOnByte, hexLog } from '../helpers/index';
-import { GRAPHICS_OUTPUT_LOCATION, GRAPHICS_OUTPUT_SIZE } from '../constants';
+import { FRAME_LOCATION, FRAME_SIZE } from '../constants';
 
 export class Lcd {
   // Memory Locations
@@ -102,8 +102,8 @@ function resetLcd(shouldBlankScreen: boolean): void {
 
   // Blank the screen
   if (shouldBlankScreen) {
-    for (let i = 0; i < GRAPHICS_OUTPUT_SIZE; i++) {
-      store<u8>(GRAPHICS_OUTPUT_LOCATION + i, 255);
+    for (let i = 0; i < FRAME_SIZE; i++) {
+      store<u8>(FRAME_LOCATION + i, 255);
     }
   }
 }

core/graphics/palette.ts

@@ -1,6 +1,7 @@
 import { GBC_PALETTE_LOCATION } from '../constants';
 import { Cpu } from '../cpu/index';
 import { Memory, eightBitLoadFromGBMemory, eightBitStoreIntoGBMemory } from '../memory/index';
+import { breakpoint } from '../debug/breakpoints';
 import { checkBitOnByte, resetBitOnByte, setBitOnByte, concatenateBytes, hexLog } from '../helpers/index';
 
 import { Colors } from './colors';

demo/debugger/components/graphics/paletteViewer/paletteViewer.js

@@ -81,7 +81,7 @@ export default class PaletteViewer extends Component {
   }
 
   update() {
-    if (!WasmBoy.isPlaying()) {
+    if (!WasmBoy.isReady()) {
       return;
     }
 
@@ -147,7 +147,6 @@ export default class PaletteViewer extends Component {
   }
 
   updateColor() {
-    // TODO:
     const updateTask = async () => {
       // Get the CGB palette memory
       const memoryStart = await WasmBoy._getWasmConstant('GBC_PALETTE_LOCATION');

dist/core/core.untouched.wasm

@@ -87,6 +87,10 @@
  (global $core/graphics/colors/Colors.obj1LightGrey (mut i32) (i32.const 0))
  (global $core/graphics/colors/Colors.obj1DarkGrey (mut i32) (i32.const 0))
  (global $core/graphics/colors/Colors.obj1Black (mut i32) (i32.const 0))
+ (global $core/debug/breakpoints/Breakpoints.programCounter (mut i32) (i32.const -1))
+ (global $core/debug/breakpoints/Breakpoints.readGbMemory (mut i32) (i32.const -1))
+ (global $core/debug/breakpoints/Breakpoints.writeGbMemory (mut i32) (i32.const -1))
+ (global $core/debug/breakpoints/Breakpoints.reachedBreakpoint (mut i32) (i32.const 0))
  (global $core/graphics/palette/Palette.memoryLocationBackgroundPaletteIndex (mut i32) (i32.const 65384))
  (global $core/graphics/palette/Palette.memoryLocationBackgroundPaletteData (mut i32) (i32.const 65385))
  (global $core/graphics/palette/Palette.memoryLocationSpritePaletteData (mut i32) (i32.const 65387))
@@ -234,10 +238,6 @@
  (global $core/joypad/joypad/Joypad.joypadRegisterFlipped (mut i32) (i32.const 0))
  (global $core/joypad/joypad/Joypad.isDpadType (mut i32) (i32.const 0))
  (global $core/joypad/joypad/Joypad.isButtonType (mut i32) (i32.const 0))
- (global $core/debug/breakpoints/Breakpoints.programCounter (mut i32) (i32.const -1))
- (global $core/debug/breakpoints/Breakpoints.readGbMemory (mut i32) (i32.const -1))
- (global $core/debug/breakpoints/Breakpoints.writeGbMemory (mut i32) (i32.const -1))
- (global $core/debug/breakpoints/Breakpoints.reachedBreakpoint (mut i32) (i32.const 0))
  (global $core/graphics/lcd/Lcd.currentLcdMode (mut i32) (i32.const 0))
  (global $core/graphics/lcd/Lcd.coincidenceCompare (mut i32) (i32.const 0))
  (global $core/graphics/lcd/Lcd.enabled (mut i32) (i32.const 1))
@@ -2581,11 +2581,11 @@
     local.set $0
     loop $repeat|0
      local.get $0
-     i32.const 476288
+     i32.const 93184
      i32.ge_s
      br_if $break|0
      local.get $0
-     i32.const 67584
+     i32.const 91264
      i32.add
      i32.const 255
      i32.store8