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function testTransferToImageBitmap(webglContextVersion, bitmap) {
var internalFormat = "RGBA";
var pixelFormat = "RGBA";
var pixelType = "UNSIGNED_BYTE";
var width = 32;
var height = 32;
var canvas = document.createElement("canvas");
canvas.width = width;
canvas.height = height;
var gl = WebGLTestUtils.create3DContext(canvas);
gl.clearColor(0,0,0,1);
gl.clearDepth(1);
gl.disable(gl.BLEND);
TexImageUtils.setupTexturedQuad(gl, internalFormat);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
// Enable writes to the RGBA channels
gl.colorMask(1, 1, 1, 0);
var texture = gl.createTexture();
// Bind the texture to texture unit 0
gl.bindTexture(gl.TEXTURE_2D, texture);
// Set up texture parameters
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
var targets = [gl.TEXTURE_2D];
// Upload the image into the texture
for (var tt = 0; tt < targets.length; ++tt) {
gl.texImage2D(targets[tt], 0, gl[internalFormat], gl[pixelFormat], gl[pixelType], bitmap);
}
for (var tt = 0; tt < targets.length; ++tt) {
// Draw the triangles
gl.clearColor(0, 0, 0, 1);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
gl.drawArrays(gl.TRIANGLES, 0, 6);
var buf = new Uint8Array(width * height * 4);
gl.readPixels(0, 0, width, height, gl.RGBA, gl.UNSIGNED_BYTE, buf);
_checkCanvas(buf, width, height, webglContextVersion);
}
}
function _checkCanvas(buf, width, height, webglContextVersion)
{
for (var i = 0; i < width * height; i++) {
if (buf[i * 4] != 255 || buf[i * 4 + 1] != 255 ||
buf[i * 4 + 2] != 0 || buf[i * 4 + 3] != 255) {
testFailed("OffscreenCanvas." + webglContextVersion +
": This pixel should be [255, 255, 0, 255], but it is: [" + buf[i * 4] + ", " +
buf[i * 4 + 1] + ", " + buf[i * 4 + 2] + ", " + buf[i * 4 + 3] + "].");
return;
}
}
testPassed("TransferToImageBitmap test on OffscreenCanvas." + webglContextVersion + " passed");
}
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