Quelle test_hidden_alpha.html Sprache: HTML

products/Sources/formale Sprachen/C/Firefox/dom/canvas/test/webgl-mochitest/test_hidden_alpha.html

<!DOCTYPE HTML>
<title>WebGL test: Hidden alpha on no-alpha contexts</title>
<script src='/tests/SimpleTest/SimpleTest.js'></script>
<link rel='stylesheet' href='/tests/SimpleTest/test.css'>
<script src='driver-info.js'></script>
<script src='webgl-util.js'></script>
<body>
<script id='vs' type='x-shader/x-vertex'>
  attribute vec2 aPosCoord;

  void main(void) {
    gl_Position = vec4(aPosCoord, 0.0, 1.0);
  }
</script>

<script id='fs' type='x-shader/x-fragment'>
  precision mediump float;

  void main(void) {
    gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
  }
</script>
<canvas id='canvas' style='border: none;' width='100' height='100'></canvas>
<script>

var posCoords_arr = new Float32Array(2 * 4);
var posCoords_buff = null;
function DrawQuad(gl, prog, x0, y0, x1, y1) {
  gl.useProgram(prog);

  if (!posCoords_buff) {
    posCoords_buff = gl.createBuffer();
  }
  gl.bindBuffer(gl.ARRAY_BUFFER, posCoords_buff);
  posCoords_arr[0] = x0;
  posCoords_arr[1] = y0;

  posCoords_arr[2] = x1;
  posCoords_arr[3] = y0;

  posCoords_arr[4] = x0;
  posCoords_arr[5] = y1;

  posCoords_arr[6] = x1;
  posCoords_arr[7] = y1;
  gl.bufferData(gl.ARRAY_BUFFER, posCoords_arr, gl.STREAM_DRAW);

  gl.enableVertexAttribArray(prog.aPosCoord);
  gl.vertexAttribPointer(prog.aPosCoord, 2, gl.FLOAT, false, 0, 0);

  gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4);
}

function DrawSquare(gl, prog, size) {
  DrawQuad(gl, prog, -size, -size, size, size);
}

function Reset(gl) {
  gl.canvas.width += 1;
  gl.canvas.width -= 1;
}

function ReadCenterPixel(gl) {
  var w = gl.drawingbufferWidth;
  var h = gl.drawingbufferHeight;
  var ret = new Uint8Array(4);
  gl.readPixels(w/2, h/2, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, ret);
  return ret;
}

function Test(gl, prog) {
  gl.enable(gl.BLEND);
  gl.blendFunc(gl.ZERO, gl.DST_ALPHA);

  var iColor = 64;
  var fColor = iColor / 255.0;

  //////////////////

  ok(true, 'clear(R,G,B,0)');

  Reset(gl);

  gl.clearColor(fColor, fColor, fColor, 0.0);
  gl.clear(gl.COLOR_BUFFER_BIT);

  var dataURL_pre = gl.canvas.toDataURL();
  //console.log('Before blending: ' + dataURL_pre);

  DrawSquare(gl, prog, 0.7);

  var pixel = ReadCenterPixel(gl);
  ok(pixel[0] == iColor &&
     pixel[1] == iColor &&
     pixel[2] == iColor, 'Color should be the same.');
  ok(pixel[3] == 255, 'No-alpha should always readback as 1.0 alpha.');

  var dataURL_post = gl.canvas.toDataURL();
  //console.log('After blending: ' + dataURL_post);
  ok(dataURL_post == dataURL_pre,
     'toDataURL should be unchanged after blending.');

  //////////////////

  ok(true, 'mask(R,G,B,0), clear(R,G,B,1)');

  Reset(gl);

  gl.colorMask(true, true, true, false);
  gl.clearColor(fColor, fColor, fColor, 1.0);
  gl.clear(gl.COLOR_BUFFER_BIT);
  gl.colorMask(true, true, true, true);

  dataURL_pre = gl.canvas.toDataURL();
  //console.log('Before blending: ' + dataURL_pre);

  DrawSquare(gl, prog, 0.7);

  var pixel = ReadCenterPixel(gl);
  ok(pixel[0] == iColor &&
     pixel[1] == iColor &&
     pixel[2] == iColor, 'Color should be the same.');
  ok(pixel[3] == 255, 'No-alpha should always readback as 1.0 alpha.');
  ok(gl.getError() == 0, 'Should have no errors.');

  dataURL_post = gl.canvas.toDataURL();
  //console.log('After blending: ' + dataURL_post);
  ok(dataURL_post == dataURL_pre,
     'toDataURL should be unchanged after blending.');

  ok(true, 'Test complete.');
  SimpleTest.finish();
}

(function(){
  var canvas = document.getElementById('canvas');
  var attribs = {
    alpha: false,
    antialias: false,
    premultipliedAlpha: false,
  };
  var gl = canvas.getContext('experimental-webgl', attribs);
  ok(gl, 'WebGL should work.');
  ok(gl.getParameter(gl.ALPHA_BITS) == 0, 'Shouldn\'t have alpha bits.');

  var prog = WebGLUtil.createProgramByIds(gl, 'vs', 'fs');
  ok(prog, 'Program should link.');
  prog.aPosCoord = gl.getAttribLocation(prog, 'aPosCoord');

  SimpleTest.waitForExplicitFinish();
  SimpleTest.requestFlakyTimeout("untriaged");
  setTimeout(function(){ Test(gl, prog); }, 500);
})();

</script>
</body>

Messung V0.5

¤ Dauer der Verarbeitung: 0.26 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung und die Messung sind noch experimentell.