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Test for signed int attribs conversion (#2488)
* Test for signed int attribs conversion The test verifies that a WebGL 2 implementation converts singed integer vertex attributes using zero-presering rule as it's required to the GLES 3 spec. * Test for signed int attribs conversion Review fixes.
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gl-vertex-attrib.html | ||
gl-vertex-attrib-i-render.html | ||
--min-version 2.0.1 gl-vertex-attrib-normalized-int.html | ||
gl-vertexattribipointer.html | ||
gl-vertexattribipointer-offsets.html |
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sdk/tests/conformance2/attribs/gl-vertex-attrib-normalized-int.html
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<!-- | ||
/* | ||
** Copyright (c) 2017 The Khronos Group Inc. | ||
** | ||
** Permission is hereby granted, free of charge, to any person obtaining a | ||
** copy of this software and/or associated documentation files (the | ||
** "Materials"), to deal in the Materials without restriction, including | ||
** without limitation the rights to use, copy, modify, merge, publish, | ||
** distribute, sublicense, and/or sell copies of the Materials, and to | ||
** permit persons to whom the Materials are furnished to do so, subject to | ||
** the following conditions: | ||
** | ||
** The above copyright notice and this permission notice shall be included | ||
** in all copies or substantial portions of the Materials. | ||
** | ||
** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | ||
** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | ||
** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. | ||
** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY | ||
** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, | ||
** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE | ||
** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS. | ||
*/ | ||
--> | ||
<!DOCTYPE html> | ||
<html> | ||
<head> | ||
<title>WebGL 2 Normalized Vertex Attributes Conformance Test</title> | ||
<meta charset="utf-8"> | ||
<link rel="stylesheet" href="../../resources/js-test-style.css"/> | ||
</head> | ||
<body> | ||
<canvas width=1 height=1></canvas> | ||
<div id="description"></div> | ||
<div id="console"></div> | ||
<script id="vertex-shader" type="x-shader/x-vertex">#version 300 es | ||
layout(location = 0) in vec3 vertex; | ||
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out float normAttrib; | ||
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void main(void) { | ||
gl_Position = vec4(vertex.xy, 0, 1); | ||
normAttrib = vertex.z; | ||
} | ||
</script> | ||
<script id="fragment-shader" type="x-shader/x-fragment">#version 300 es | ||
in lowp float normAttrib; | ||
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layout(location=0) out lowp vec4 fragColor; | ||
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void main(void) { | ||
fragColor = vec4(vec3(normAttrib == -1.0 ? 1.0 : 0.0), 1); | ||
} | ||
</script> | ||
<script src="../../js/js-test-pre.js"></script> | ||
<script src="../../js/webgl-test-utils.js"></script> | ||
<script> | ||
(function () { | ||
'use strict'; | ||
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var wtu = WebGLTestUtils; | ||
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var gl = wtu.create3DContext(document.querySelector('canvas'), null, 2); | ||
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var program = wtu.setupProgram(gl, ['vertex-shader', 'fragment-shader']); | ||
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gl.useProgram(program); | ||
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var buffer = gl.createBuffer(); | ||
gl.bindBuffer(gl.ARRAY_BUFFER, buffer); | ||
gl.bufferData(gl.ARRAY_BUFFER, new Int8Array([ | ||
// Here we set the third component (the one that's actually tested) | ||
// to (MIN_INT + 1). If non-zero-preserving rules are used, it'll be | ||
// converted to a float that's slightly greater than -1. If zero-preserving | ||
// rules are used, as the GLES 3 spec requires, result of conversion | ||
// should be exactly -1. | ||
-0x80, 0x7f, -0x7f, | ||
0x7f, 0x7f, -0x7f, | ||
-0x80, -0x7f, -0x7f, | ||
-0x80, -0x7f, -0x7f, | ||
0x7f, 0x7f, -0x7f, | ||
0x7f, -0x80, -0x7f | ||
]), gl.STATIC_DRAW); | ||
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gl.enableVertexAttribArray(0); | ||
gl.vertexAttribPointer(0, 3, gl.BYTE, true, 0, 0); | ||
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gl.drawArrays(gl.TRIANGLE_STRIP, 0, 6); | ||
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wtu.checkCanvas(gl, [255, 255, 255, 255], "should be opaque white"); | ||
}()); | ||
</script> | ||
<script> | ||
description('Verify that conversion of normalized signed int attributes to floats uses zero-preserving rule.'); | ||
window.successfullyParsed = true; | ||
</script> | ||
<script src="../../js/js-test-post.js"></script> | ||
</body> | ||
</html> |