MichaelValwin/Chipvuelto8
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Tried to pass the test but failed

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This commit is contained in:
Miguel Angel 2024-09-07 13:17:58 +02:00
parent 26774f49af
commit bc0f326bcc
1 changed files with 12 additions and 1 deletions
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13
src/cpu.ts
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@ -327,11 +327,15 @@ class CPU {
case 0xD: {
// DXYN
// draw(Vx, Vy, N)
// Draws a sprite at coordinate (VX, VY) that has a width of 8 pixels and a height of N pixels
this.regs[0xF] = 0; // Reset register VF
let regX = this.regs[nib2];
let regY = this.regs[nib3];
regX = regX % 64;
regY = regY % 32;
for(let y = 0; y < nib4; y++) {
// A sprite is always 8 bits horizontal
let pixel = this.memory[this.indexReg + y]; // Fetch pixel from memory starting at I reg
@ -340,7 +344,14 @@ class CPU {
const MSB = 0x80; // 0b10000000
if((pixel & (MSB >> x)) != 0) {
let mem = x + regX + ((y + regY) * SCREEN_WIDTH);
let r = x + regX;
let c = ((y + regY) * SCREEN_WIDTH);
let mem = r + c;
if(r+c > 64*32) {
mem = mem % (64*32);
}
if(this.displayMemory[mem] == 1) {
this.regs[0xF] = 1;
}