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More VT100 groundwork

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This commit is contained in:
Jeff Parsons 2016-07-27 12:03:12 -07:00 • committed by Jeff Parsons
commit c8f5357689
11 changed files with 162 additions and 14 deletions
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28
modules/pc8080/lib/video.js
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@ -52,6 +52,8 @@ if (NODE) {
* screenRotate: the amount of counter-clockwise screen rotation required (eg, -90 or 270)
* aspectRatio (eg, 1.33)
* bufferAddr: the starting address of the frame buffer (eg, 0x2400)
* bufferRAM: true to use existing RAM (default is false)
* bufferFormat: can be set to anything, but the only recognized format is currently "vt100"
* bufferCols: the width of a single frame buffer row, in pixels (eg, 256)
* bufferRows: the number of frame buffer rows (eg, 224)
* bufferBits: the number of bits per column (default is 1)
@ -96,6 +98,8 @@ function Video(parmsVideo, canvas, context, textarea, container)
this.cyScreen = parmsVideo['screenHeight'];
this.addrBuffer = parmsVideo['bufferAddr'];
this.fUseRAM = parmsVideo['bufferRAM'];
this.sFormat = parmsVideo['bufferFormat'];
this.cxBuffer = parmsVideo['bufferCols'];
this.cyBuffer = parmsVideo['bufferRows'];
this.nBitsPerPixel = parmsVideo['bufferBits'] || 1;
@ -212,6 +216,10 @@ function Video(parmsVideo, canvas, context, textarea, container)
Component.subclass(Video);
/*
* TODO: Use of these overlay colors should be limited to machine's that require/request them (ie, Space Invaders),
* using an additional parmsVideo property.
*/
Video.COLORS = {
OVERLAY_TOP: 0,
OVERLAY_BOTTOM: 1,
@ -237,14 +245,18 @@ Video.prototype.initBus = function(cmp, bus, cpu, dbg)
/*
* Compute the size of the frame buffer and allocate.
*/
this.sizeBuffer = ((this.cxBuffer * this.nBitsPerPixel) >> 3) * this.cyBuffer;
if (this.bus.addMemory(this.addrBuffer, this.sizeBuffer, Memory.TYPE.VIDEO)) {
/*
* Compute the number of cells and initialize the cell cache.
*/
this.nCellCache = this.sizeBuffer >> 1;
this.nPixelsPerCell = (16 / this.nBitsPerPixel)|0;
this.initCache();
if (!this.fUseRAM) {
this.sizeBuffer = ((this.cxBuffer * this.nBitsPerPixel) >> 3) * this.cyBuffer;
if (this.bus.addMemory(this.addrBuffer, this.sizeBuffer, Memory.TYPE.VIDEO)) {
/*
* Compute the number of cells and initialize the cell cache; note that sizeBuffer is a number of
* bytes, whereas nCellCache is a number of 16-bit words (aka shorts) because we fetch memory 16 bits
* at a time during screen updates.
*/
this.nCellCache = this.sizeBuffer >> 1;
this.nPixelsPerCell = (16 / this.nBitsPerPixel)|0;
this.initCache();
}
}
/*