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-rw-r--r-- | dom/canvas/test/webgl-conf/checkout/conformance2/transform_feedback/unwritten-output-defaults-to-zero.html | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/dom/canvas/test/webgl-conf/checkout/conformance2/transform_feedback/unwritten-output-defaults-to-zero.html b/dom/canvas/test/webgl-conf/checkout/conformance2/transform_feedback/unwritten-output-defaults-to-zero.html new file mode 100644 index 0000000000..615ab9bab1 --- /dev/null +++ b/dom/canvas/test/webgl-conf/checkout/conformance2/transform_feedback/unwritten-output-defaults-to-zero.html @@ -0,0 +1,133 @@ +<!-- +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"> +<title>WebGL Transform Feedback 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> +</head> +<body> +<div id="description"></div> +<canvas id="canvas" style="width: 50px; height: 50px;"> </canvas> +<div id="console"></div> +<script id="vshader" type="x-shader/x-vertex">#version 300 es +in vec4 in_data; +uniform int flag; +out vec4 out_data; +void main(void) { + if (flag > 0) { + out_data = in_data + vec4(2.0, 3.0, 4.0, 5.0); + } +} +</script> +<script id="fshader" type="x-shader/x-fragment">#version 300 es +precision mediump float; +out vec4 out_color; +void main(void) { + out_color = vec4(1.0, 1.0, 1.0, 1.0); +} +</script> +<script> +"use strict"; +description("This test verifies if an output variable is specified to be streamed to a transform feedback buffer but not actually written, the value defaults to 0."); + +debug(""); + +var wtu = WebGLTestUtils; +var canvas = document.getElementById("canvas"); +var gl = wtu.create3DContext(canvas, null, 2); + +if (!gl) { + testFailed("WebGL context does not exist"); +} else { + testPassed("WebGL context exists"); + + debug(""); + debug("Testing transform feedback works fine"); + runTest(1); + + debug(""); + debug("Testing unwritten output variables default to zero"); + runTest(0); +} + +function runTest(flag) { + var in_data = [ + 1.0, 2.0, 3.0, 4.0, + 2.0, 4.0, 8.0, 16.0, + 0.75, 0.5, 0.25, 0.0 + ]; + + var in_buffer = gl.createBuffer(); + gl.bindBuffer(gl.ARRAY_BUFFER, in_buffer); + gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(in_data), gl.STATIC_DRAW); + + var out_buffer = gl.createBuffer(); + gl.bindBuffer(gl.TRANSFORM_FEEDBACK_BUFFER, out_buffer); + gl.bufferData(gl.TRANSFORM_FEEDBACK_BUFFER, Float32Array.BYTES_PER_ELEMENT * in_data.length, gl.STATIC_DRAW); + + // Create the transform feedback program + var program = wtu.setupTransformFeedbackProgram(gl, ["vshader", "fshader"], + ["out_data"], gl.SEPARATE_ATTRIBS, + ["in_data"]); + var loc = gl.getUniformLocation(program, "flag"); + if (!program || !loc) { + testFailed("Fail to set up the program"); + return; + } + gl.uniform1i(loc, flag); + wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Set up program should succeed"); + + // Draw the the transform feedback buffers + var tf = gl.createTransformFeedback(); + + gl.enableVertexAttribArray(0); + gl.bindBuffer(gl.ARRAY_BUFFER, in_buffer); + gl.vertexAttribPointer(0, 4, gl.FLOAT, false, 16, 0); + + gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, tf); + gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 0, out_buffer); + + gl.enable(gl.RASTERIZER_DISCARD); + gl.beginTransformFeedback(gl.POINTS); + + gl.drawArrays(gl.POINTS, 0, 3); + + gl.endTransformFeedback(); + gl.disable(gl.RASTERIZER_DISCARD); + + gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 0, null); + + // Verify the output buffer contents + var expected_data; + if (flag > 0) { + expected_data = [ + 3.0, 5.0, 7.0, 9.0, + 4.0, 7.0, 12.0, 21.0, + 2.75, 3.5, 4.25, 5.0 + ]; + } else { + expected_data = [ + 0.0, 0.0, 0.0, 0.0, + 0.0, 0.0, 0.0, 0.0, + 0.0, 0.0, 0.0, 0.0 + ]; + } + gl.bindBuffer(gl.TRANSFORM_FEEDBACK_BUFFER, out_buffer); + wtu.checkFloatBuffer(gl, gl.TRANSFORM_FEEDBACK_BUFFER, expected_data); +} + +debug(""); +var successfullyParsed = true; +</script> +<script src="../../js/js-test-post.js"></script> + +</body> +</html> |