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Support for message buffering (PC8080 only; needs to be added to PCx86, too)

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This commit is contained in:
Jeff Parsons 2016-05-31 09:59:19 -07:00
commit 43355dec6f
3 changed files with 37 additions and 5 deletions
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21
modules/pc8080/lib/video.js
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@ -206,6 +206,8 @@ function Video(parmsVideo, canvas, context, textarea, container)
}
}
}
if (DEBUG) this.nCyclesPrev = 0;
}
Component.subclass(Video);
@ -484,6 +486,9 @@ Video.prototype.setPixel = function(imageBuffer, x, y, bPixel)
*/
Video.prototype.updateScreen = function(n)
{
var fClean;
var fUpdate = true;
if (n >= 0) {
if (!(n & 1)) {
/*
@ -497,17 +502,27 @@ Video.prototype.updateScreen = function(n)
* update the bottom half of the frame buffer after acknowledging this interrupt.
*/
this.cpu.requestINTR(2);
return;
fUpdate = false;
}
/*
* Since this is not a forced update, if our cell cache is valid AND the buffer is clean, then do nothing.
*/
if (this.fCellCacheValid && this.bus.cleanMemory(this.addrBuffer, this.sizeBuffer)) {
return;
if (fUpdate && this.fCellCacheValid) {
if ((fClean = this.bus.cleanMemory(this.addrBuffer, this.sizeBuffer))) {
fUpdate = false;
}
}
}
if (DEBUG) {
var nCycles = this.cpu.getCycles();
var nCyclesDelta = nCycles - this.nCyclesPrev;
this.nCyclesPrev = nCycles;
this.printMessage("updateScreen(" + n + "): clean=" + fClean + ", update=" + fUpdate + ", cycles=" + nCycles + ", delta=" + nCyclesDelta);
}
if (!fUpdate) return;
var addr = this.addrBuffer;
var addrLimit = addr + this.sizeBuffer;