dependent-buffer-change.html

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Copyright (c) 2019 The Khronos Group Inc.

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<meta charset="utf-8">

<title>WebGL draw with uniform blocks conformance tests</title>

<link rel="stylesheet" href="../../resources/js-test-style.css"/>

<script src="../../js/js-test-pre.js"></script>

<script src="../../js/webgl-test-utils.js"></script>

<script id="vshader" type="x-shader/x-vertex">#version 300 es

in vec4 a_vertex;

void main(void) {

  gl_Position = a_vertex;

</script>

<script id="fshader" type="x-shader/x-fragment">#version 300 es

precision mediump float;

layout (std140) uniform color_ubo {

  vec4 color;

};

out vec4 fragColor;

void main(void) {

  fragColor = color;

</script>

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<canvas id="example" width="100", height="100"></canvas>

<div id="description"></div>

<div id="console"></div>

<script>

"use strict";

debug("");

// Ported from: https://github.com/google/angle/blob/master/src/tests/gl_tests/UniformBufferTest.cpp#L1507

description("Regression test for https://bugs.chromium.org/p/chromium/issues/detail?id=792966");

var wtu = WebGLTestUtils;

var gl = wtu.create3DContext("example", undefined, 2);

function runTest() {

    var program = wtu.setupProgram(gl, ['vshader', 'fshader'], ['a_vertex']);

    var uboIndex = gl.INVALID_INDEX;

    if (program)

        uboIndex = gl.getUniformBlockIndex(program, "color_ubo");

    if (!program || uboIndex == gl.INVALID_INDEX) {

        testFailed("Loading program failed");

        return;

    testPassed("Loading program succeeded");

    var vertices = new Float32Array([

        -1, -1, 0,

         1, -1, 0,

        -1,  1, 0,

         1,  1, 0

]);

    var vertexBuf = gl.createBuffer();

    gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuf);

    gl.bufferData(gl.ARRAY_BUFFER, vertices, gl.STATIC_DRAW);

    gl.enableVertexAttribArray(0);

    gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0);

    var indexBuf = gl.createBuffer();

    gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indexBuf);

    gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Int16Array([ 0, 1, 2, 2, 1, 3 ]), gl.STATIC_DRAW);

    var uboDataSize = gl.getActiveUniformBlockParameter(

        program, uboIndex, gl.UNIFORM_BLOCK_DATA_SIZE);

    if (uboDataSize == 0) {

        testFailed("uniform block data size invalid");

        return;

    wtu.glErrorShouldBe(gl, gl.NO_ERROR, "No errors from setup");

    debug("draw lower triangle - should be red");

    var uboBuf1 = gl.createBuffer();

    gl.bindBufferBase(gl.UNIFORM_BUFFER, 0, uboBuf1);

    gl.bufferData(gl.UNIFORM_BUFFER, uboDataSize, gl.STATIC_DRAW);

    gl.bufferSubData(gl.UNIFORM_BUFFER, 0, new Float32Array([ 1, 0, 0, 1 ]));

    gl.uniformBlockBinding(program, uboIndex, 0);

    gl.drawElements(gl.TRIANGLES, 3, gl.UNSIGNED_SHORT, 0);

    wtu.glErrorShouldBe(gl, gl.NO_ERROR, "No errors from draw");

    // Resize the buffer - triggers a re-allocation in the D3D11 back-end.

    debug("draw upper triangle - should be green");

    var bigData = new Float32Array(128 * 4);

    bigData.set([ 0, 1, 0, 1 ]);

    gl.bufferData(gl.UNIFORM_BUFFER, bigData, gl.STATIC_DRAW);

    gl.drawElements(gl.TRIANGLES, 3, gl.UNSIGNED_SHORT, 6);

    wtu.glErrorShouldBe(gl, gl.NO_ERROR, "No errors from draw");

    var width = 100, height = 100;

    wtu.checkCanvasRectColor(gl, 0, 0, width/2-5, height/2-5, [255, 0, 0, 255], 2,

        function() { testPassed("lower left should be red"); },

        function() { testFailed("lower left should be red"); });

    wtu.checkCanvasRectColor(gl, width/2+5, height/2+5, width/2-5, height/2-5, [0, 255, 0, 255], 2,

        function() { testPassed("top right should be green"); },

        function() { testFailed("top right should be green"); });

if (!gl) {

    testFailed("WebGL context creation failed");

} else {

    testPassed("WebGL context creation succeeded");

    runTest();

debug("");

var successfullyParsed = true;

</script>

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