tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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webgl-draw-buffers-utils.js (2314B)

      1 /*
      2 Copyright (c) 2019 The Khronos Group Inc.
      3 Use of this source code is governed by an MIT-style license that can be
      4 found in the LICENSE.txt file.
      5 */
      6 
      7 // This file contains utilities shared between tests for the WEBGL_draw_buffers extension and multiple draw buffers functionality in WebGL 2.0.
      8 
      9 'use strict';
     10 
     11 var WebGLDrawBuffersUtils = function(gl, ext) {
     12 
     13  var getMaxUsableColorAttachments = function() {
     14    var maxDrawingBuffers;
     15    var maxColorAttachments;
     16    if (ext) {
     17      // EXT_draw_buffers
     18      maxDrawingBuffers = gl.getParameter(ext.MAX_DRAW_BUFFERS_WEBGL);
     19      maxColorAttachments = gl.getParameter(ext.MAX_COLOR_ATTACHMENTS_WEBGL);
     20    } else {
     21      // WebGL 2.0
     22      maxDrawingBuffers = gl.getParameter(gl.MAX_DRAW_BUFFERS);
     23      maxColorAttachments = gl.getParameter(gl.MAX_COLOR_ATTACHMENTS);
     24    }
     25    var maxUniformVectors = gl.getParameter(gl.MAX_FRAGMENT_UNIFORM_VECTORS);
     26    return Math.min(maxDrawingBuffers, maxColorAttachments, maxUniformVectors);
     27  };
     28 
     29  var makeColorAttachmentArray = function(size) {
     30    var array = []
     31    for (var ii = 0; ii < size; ++ii) {
     32      array.push(gl.COLOR_ATTACHMENT0 + ii);
     33    }
     34    return array;
     35  }
     36 
     37  var checkProgram = wtu.setupTexturedQuad(gl);
     38 
     39  var checkAttachmentsForColorFn = function(attachments, colorFn) {
     40    gl.bindFramebuffer(gl.FRAMEBUFFER, null);
     41    gl.useProgram(checkProgram);
     42    attachments.forEach(function(attachment, index) {
     43      gl.bindTexture(gl.TEXTURE_2D, attachment.texture);
     44      wtu.clearAndDrawUnitQuad(gl);
     45      var expectedColor = colorFn(attachment, index);
     46      var tolerance = 0;
     47      expectedColor.forEach(function(v) {
     48        if (v != 0 && v != 255) {
     49          tolerance = 8;
     50        }
     51      });
     52      wtu.checkCanvas(gl, expectedColor, "attachment " + index + " should be " + expectedColor.toString(), tolerance);
     53    });
     54    debug("");
     55  };
     56 
     57  var checkAttachmentsForColor = function(attachments, color) {
     58    checkAttachmentsForColorFn(attachments, function(attachment, index) {
     59      return color || attachment.color;
     60    });
     61  };
     62 
     63  return {
     64    getMaxUsableColorAttachments: getMaxUsableColorAttachments,
     65    makeColorAttachmentArray: makeColorAttachmentArray,
     66    checkAttachmentsForColorFn: checkAttachmentsForColorFn,
     67    checkAttachmentsForColor: checkAttachmentsForColor
     68  };
     69 };