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-rw-r--r-- | dom/canvas/test/webgl-conf/checkout/conformance/reading/fbo-remains-unchanged-after-read-pixels.html | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/reading/fbo-remains-unchanged-after-read-pixels.html b/dom/canvas/test/webgl-conf/checkout/conformance/reading/fbo-remains-unchanged-after-read-pixels.html new file mode 100644 index 0000000000..00e8dcd9a0 --- /dev/null +++ b/dom/canvas/test/webgl-conf/checkout/conformance/reading/fbo-remains-unchanged-after-read-pixels.html @@ -0,0 +1,105 @@ +<!-- +Copyright (c) 2019 The Khronos Group Inc. +Use of this source code is governed by an MIT-style license that can be +found in the LICENSE.txt file. +--> + +<!DOCTYPE html> +<html> +<head> +<meta charset="utf-8"> +<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> +</head> +<body> +<div id="description"></div> +<div id="console"></div> +<canvas id="canvas" width="4" height="4"></canvas> +<script id="vshader" type="x-shader/x-vertex"> +attribute vec3 a_pos; +attribute vec4 a_color; +varying vec4 v_color; + +void main() +{ + v_color = a_color; + gl_Position = vec4(a_pos.xyz, 1.0); +} +</script> + +<script id="fshader" type="x-shader/x-fragment"> +precision mediump float; + +varying vec4 v_color; + +void main() +{ + gl_FragColor = v_color; +} +</script> + +<script> +"use strict"; + +description("when antialias is enabled, verify default fbo pixels would not be changed between two readPixels without drawing operations"); +var wtu = WebGLTestUtils; +var N = 4; + +var vertices = new Float32Array([ + 1.0, 1.0, 0.0, + -1.0, -1.0, 0.0]); +var colors = new Uint8Array([ + 255, 0, 0, 255, + 255, 0, 0, 255]); + +var canvas = document.getElementById('canvas'); +var gl = wtu.create3DContext(canvas, {antialias: true}); + +if (!gl) { + testFailed("context does not exist"); +} else { + testPassed("context exists"); + + var program = wtu.setupProgram(gl, ["vshader", "fshader"], ["a_pos", "a_color"]); + gl.clearColor(0, 0, 0, 1); + gl.clear(gl.COLOR_BUFFER_BIT); + + var colorOffset = vertices.byteLength; + var vbo = gl.createBuffer(); + gl.bindBuffer(gl.ARRAY_BUFFER, vbo); + gl.bufferData(gl.ARRAY_BUFFER, colorOffset + colors.byteLength, gl.STATIC_DRAW); + gl.bufferSubData(gl.ARRAY_BUFFER, 0, vertices); + gl.bufferSubData(gl.ARRAY_BUFFER, colorOffset, colors); + + gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0); + gl.enableVertexAttribArray(0); + gl.vertexAttribPointer(1, 4, gl.UNSIGNED_BYTE, true, 0, colorOffset); + gl.enableVertexAttribArray(1); + gl.drawArrays(gl.LINES, 0, vertices.length / 3); + + var result_1 = new Uint8Array(N * N * 4); + var result_2 = new Uint8Array(N * N * 4); + gl.readPixels(0, 0, N, N, gl.RGBA, gl.UNSIGNED_BYTE, result_1); + gl.readPixels(0, 0, N, N, gl.RGBA, gl.UNSIGNED_BYTE, result_2); + wtu.glErrorShouldBe(gl, gl.NO_ERROR); + + var tolerance = 0; + var diff = new Uint8Array(N * N * 4); + var failed = wtu.comparePixels(result_1, result_2, tolerance, diff); + + if (failed) { + testFailed("default fbo pixels had be changed between two readPixels without drawing operations"); + } else { + testPassed("default fbo pixels had not be changed between two readPixels without drawing operations."); + } + + gl.bindBuffer(gl.ARRAY_BUFFER, null); + gl.deleteBuffer(vbo); +} + +var successfullyParsed = true; +</script> +<script src="../../js/js-test-post.js"></script> +</body> +</html> |