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<!--
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>vertexattribpointer offsets test</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>
<canvas id="example" width="50" height="50">
There is supposed to be an example drawing here, but it's not important.
</canvas>
<div id="description"></div>
<div id="console"></div>
<script id="vshader" type="x-shader/x-vertex">
attribute vec4 vPosition;
void main()
{
gl_Position = vPosition;
}
</script>
<script id="fshader" type="x-shader/x-fragment">
precision mediump float;
uniform vec4 color;
void main()
{
gl_FragColor = color;
}
</script>
<script>
"use strict";
function init()
{
description("test vertexattribpointer offsets work");
var wtu = WebGLTestUtils;
var gl = wtu.create3DContext("example");
var program = wtu.setupProgram(gl, ["vshader", "fshader"], ["vPosition"]);
var tests = [
{ data: new Float32Array([ 0, 1, 0, 1, 0, 0, 0, 0, 0 ]),
type: gl.FLOAT,
componentSize: 4,
normalize: false,
},
{ data: new Uint16Array([ 0, 32767, 0, 32767, 0, 0, 0, 0, 0]),
type: gl.SHORT,
componentSize: 2,
normalize: true,
},
{ data: new Uint16Array([ 0, 65535, 0, 65535, 0, 0, 0, 0, 0 ]),
type: gl.UNSIGNED_SHORT,
componentSize: 2,
normalize: true,
},
{ data: new Uint16Array([ 0, 1, 0, 1, 0, 0, 0, 0, 0 ]),
type: gl.UNSIGNED_SHORT,
componentSize: 2,
normalize: false,
},
{ data: new Uint16Array([ 0, 1, 0, 1, 0, 0, 0, 0, 0 ]),
type: gl.SHORT,
componentSize: 2,
normalize: false,
},
{ data: new Uint8Array([ 0, 127, 0, 127, 0, 0, 0, 0, 0 ]),
type: gl.BYTE,
componentSize: 1,
normalize: true,
},
{ data: new Uint8Array([ 0, 255, 0, 255, 0, 0, 0, 0, 0 ]),
type: gl.UNSIGNED_BYTE,
componentSize: 1,
normalize: true,
},
{ data: new Uint8Array([ 0, 1, 0, 1, 0, 0, 0, 0, 0 ]),
type: gl.BYTE,
componentSize: 1,
normalize: false,
},
{ data: new Uint8Array([ 0, 1, 0, 1, 0, 0, 0, 0, 0 ]),
type: gl.UNSIGNED_BYTE,
componentSize: 1,
normalize: false,
}
];
if (wtu.getDefault3DContextVersion() >= 2) {
tests.push(...[
{ data: new Int32Array([ 0, 1, 0, 1, 0, 0, 0, 0, 0]),
type: gl.INT,
componentSize: 4,
normalize: false,
},
{ data: new Int32Array([ 0, 2147483647, 0, 2147483647, 0, 0, 0, 0, 0]),
type: gl.INT,
componentSize: 4,
normalize: true,
},
{ data: new Uint32Array([ 0, 1, 0, 1, 0, 0, 0, 0, 0]),
type: gl.UNSIGNED_INT,
componentSize: 4,
normalize: false,
},
{ data: new Uint32Array([ 0, 4294967295, 0, 4294967295, 0, 0, 0, 0, 0]),
type: gl.UNSIGNED_INT,
componentSize: 4,
normalize: true,
},
{ data: new Uint16Array([ 0, 0b11110000000000, 0, 0b11110000000000, 0, 0, 0, 0, 0]),
type: gl.HALF_FLOAT,
componentSize: 2,
normalize: false,
},
{ data: new Uint16Array([ 0, 0b11110000000000, 0, 0b11110000000000, 0, 0, 0, 0, 0]),
type: gl.HALF_FLOAT,
componentSize: 2,
normalize: false,
}
]);
}
var vertexObject = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
gl.bufferData(gl.ARRAY_BUFFER, 1024, gl.STATIC_DRAW);
gl.enableVertexAttribArray(0);
var colorLoc = gl.getUniformLocation(program, "color");
var kNumVerts = 3;
var kNumComponents = 3;
var count = 0;
for (var tt = 0; tt < tests.length; ++tt) {
var test = tests[tt];
for (var oo = 0; oo < 3; ++oo) {
for (var ss = 0; ss < 3; ++ss) {
var offset = (oo + 1) * test.componentSize;
var color = (count % 2) ? [1, 0, 0, 1] : [0, 1, 0, 1];
var stride = test.componentSize * kNumComponents + test.componentSize * ss;
debug("");
debug("check with " + wtu.glEnumToString(gl, test.type) + " at offset: " + offset + " with stride:" + stride + " normalize: " + test.normalize);
gl.uniform4fv(colorLoc, color);
var data = new Uint8Array(test.componentSize * kNumVerts * kNumComponents + stride * (kNumVerts - 1));
var view = new Uint8Array(test.data.buffer);
var size = test.componentSize * kNumComponents;
for (var jj = 0; jj < kNumVerts; ++jj) {
var off1 = jj * size;
var off2 = jj * stride;
for (var zz = 0; zz < size; ++zz) {
data[off2 + zz] = view[off1 + zz];
}
}
gl.bufferSubData(gl.ARRAY_BUFFER, offset, data);
gl.vertexAttribPointer(0, 3, test.type, test.normalize, stride, offset);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
gl.drawArrays(gl.TRIANGLES, 0, 3);
var buf = new Uint8Array(50 * 50 * 4);
gl.readPixels(0, 0, 50, 50, gl.RGBA, gl.UNSIGNED_BYTE, buf);
var black = [0, 0, 0, 0];
var other = [color[0] * 255, color[1] * 255, color[2] * 255, color[3] * 255];
var otherMsg = "should be " + ((count % 2) ? "red" : "green")
wtu.checkCanvasRect(gl, 0, 0, 1, 1, black, "should be black", 0);
wtu.checkCanvasRect(gl, 0, 49, 1, 1, black, "should be black", 0);
wtu.checkCanvasRect(gl, 26, 40, 1, 1, other, otherMsg, 0);
wtu.checkCanvasRect(gl, 26, 27, 1, 1, other, otherMsg, 0);
wtu.checkCanvasRect(gl, 40, 27, 1, 1, other, otherMsg, 0);
++count;
}
}
}
}
init();
var successfullyParsed = true;
</script>
<script src="../../js/js-test-post.js"></script>
</body>
</html>