Apple-2-Tools/apple2shader
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webgl: add battle-chess image; add dhgr conversion param

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This commit is contained in:
Zellyn Hunter 2018-05-15 22:01:01 -04:00
parent 142acc1523
commit 9781548413
3 changed files with 4 additions and 2 deletions
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images/battle-chess.png Normal file
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Width:  |  Height:  |  Size: 5.2 KiB

1
index.html
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@ -176,6 +176,7 @@
async function setupScreenView() {
const image = await screenEmu.loadImage("images/airheart-560x192.png");
// const image = await screenEmu.loadImage("images/battle-chess.png");
const [imageCanvas, imageData] = screenEmu.screenData(image, screenEmu.C.NTSC_DETAILS);
let canvas = document.getElementById("d");

5
screenEmu.js
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@ -487,7 +487,7 @@ void main(void)
// image: a 560x192 image, from the same domain (hence readable).
// details: NTSC_DETAILS, or PAL_DETAILS
// returns: a canvas
const screenData = (image, details) => {
const screenData = (image, details, dhgr=true) => {
if ((image.naturalWidth != 560) || (image.naturalHeight != 192)) {
throw new Error('screenData expects an image 560x192;' +
` got ${image.naturalWidth}x${image.naturalHeight}`);
@ -500,7 +500,8 @@ void main(void)
canvas.height = height;
context.fillStyle = 'rgba(0,0,0,1)';
context.fillRect(0, 0, width, height);
context.drawImage(image, details.topLeft80Col.x, details.topLeft80Col.y);
const topLeft = dhgr ? details.topLeft80Col : details.topLeft;
context.drawImage(image, topLeft.x, topLeft.y);
const imageData = context.getImageData(0, 0, width, height);
return [canvas, imageData];
};