tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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rrUtil.js (3867B)

      1 /*-------------------------------------------------------------------------
      2 * drawElements Quality Program OpenGL ES Utilities
      3 * ------------------------------------------------
      4 *
      5 * Copyright 2014 The Android Open Source Project
      6 *
      7 * Licensed under the Apache License, Version 2.0 (the "License");
      8 * you may not use this file except in compliance with the License.
      9 * You may obtain a copy of the License at
     10 *
     11 *      http://www.apache.org/licenses/LICENSE-2.0
     12 *
     13 * Unless required by applicable law or agreed to in writing, software
     14 * distributed under the License is distributed on an "AS IS" BASIS,
     15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     16 * See the License for the specific language governing permissions and
     17 * limitations under the License.
     18 *
     19 */
     20 
     21 'use strict';
     22 goog.provide('framework.referencerenderer.rrUtil');
     23 goog.require('framework.opengl.simplereference.sglrGLContext');
     24 goog.require('framework.opengl.simplereference.sglrReferenceContext');
     25 
     26 goog.scope(function() {
     27 
     28    var rrUtil = framework.referencerenderer.rrUtil;
     29    var sglrGLContext = framework.opengl.simplereference.sglrGLContext;
     30    var sglrReferenceContext = framework.opengl.simplereference.sglrReferenceContext;
     31 
     32    /**
     33     * @param {sglrGLContext.GLContext | WebGL2RenderingContext | sglrReferenceContext.ReferenceContext} ctx
     34     * @param {number|Object} program
     35     * @param {Array<number>} p0
     36     * @param {Array<number>} p1
     37     */
     38    rrUtil.drawQuad = function(ctx, program, p0, p1) {
     39        // Vertex data.
     40        var hz = (p0[2] + p1[2]) * 0.5;
     41        /** @type {Array<number>} */ var position = [
     42        p0[0], p0[1], p0[2], 1.0,
     43        p0[0], p1[1], hz, 1.0,
     44        p1[0], p0[1], hz, 1.0,
     45        p1[0], p1[1], p1[2], 1.0
     46        ];
     47        /** @type {Array<number>} */ var coord = [
     48        0.0, 0.0,
     49        0.0, 1.0,
     50        1.0, 0.0,
     51        1.0, 1.0
     52        ];
     53        /** @type {Array<number>} */ var indices = [0, 1, 2, 2, 1, 3];
     54 
     55        var posLoc = ctx.getAttribLocation(program, 'a_position');
     56        if (posLoc == -1)
     57            throw new Error('a_position attribute is not defined.');
     58 
     59        var coordLoc = ctx.getAttribLocation(program, 'a_coord');
     60        var vaoID;
     61        var bufIDs = [];
     62 
     63        vaoID = ctx.createVertexArray();
     64        ctx.bindVertexArray(vaoID);
     65 
     66        bufIDs[0] = ctx.createBuffer();
     67        bufIDs[1] = ctx.createBuffer();
     68 
     69        ctx.useProgram(program);
     70 
     71        if (posLoc >= 0) {
     72            ctx.bindBuffer(gl.ARRAY_BUFFER, bufIDs[0]);
     73            ctx.bufferData(gl.ARRAY_BUFFER, new Float32Array(position), gl.STATIC_DRAW);
     74 
     75            ctx.enableVertexAttribArray(posLoc);
     76            ctx.vertexAttribPointer(posLoc, 4, gl.FLOAT, false, 0, 0);
     77 
     78            ctx.bindBuffer(gl.ARRAY_BUFFER, null);
     79        }
     80 
     81        if (coordLoc >= 0) {
     82            ctx.bindBuffer(gl.ARRAY_BUFFER, bufIDs[1]);
     83            ctx.bufferData(gl.ARRAY_BUFFER, new Float32Array(coord), gl.STATIC_DRAW);
     84 
     85            ctx.enableVertexAttribArray(coordLoc);
     86            ctx.vertexAttribPointer(coordLoc, 2, gl.FLOAT, false, 0, 0);
     87 
     88            ctx.bindBuffer(gl.ARRAY_BUFFER, null);
     89        }
     90 
     91        {
     92            var ndxID = ctx.createBuffer();
     93 
     94            ctx.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, ndxID);
     95            ctx.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array(indices), gl.STATIC_DRAW);
     96 
     97            ctx.drawElements(gl.TRIANGLES, 6, gl.UNSIGNED_SHORT, 0);
     98 
     99            ctx.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, null);
    100            ctx.deleteBuffer(ndxID);
    101        }
    102 
    103        ctx.bindVertexArray(null);
    104        ctx.deleteBuffer(bufIDs[0]);
    105        ctx.deleteBuffer(bufIDs[1]);
    106        ctx.deleteVertexArray(vaoID);
    107 
    108        if (posLoc >= 0)
    109          ctx.disableVertexAttribArray(posLoc);
    110 
    111        if (coordLoc >= 0)
    112          ctx.disableVertexAttribArray(coordLoc);
    113    };
    114 
    115 });