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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.
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<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>
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<script>
"use strict";
description("Tests that index validation verifies the correct number of indices");
function sizeInBytes(type) {
switch (type) {
case gl.BYTE:
case gl.UNSIGNED_BYTE:
return 1;
case gl.SHORT:
case gl.UNSIGNED_SHORT:
return 2;
case gl.INT:
case gl.UNSIGNED_INT:
case gl.FLOAT:
return 4;
default:
throw "unknown type";
}
}
var wtu = WebGLTestUtils;
var gl = wtu.create3DContext();
var program = wtu.loadStandardProgram(gl);
// 3 vertices => 1 triangle, interleaved data
var dataComplete = new Float32Array([0, 0, 0, 1,
0, 0, 1,
1, 0, 0, 1,
0, 0, 1,
1, 1, 1, 1,
0, 0, 1]);
var dataIncomplete = new Float32Array([0, 0, 0, 1,
0, 0, 1,
1, 0, 0, 1,
0, 0, 1,
1, 1, 1, 1]);
var indices = new Uint16Array([0, 1, 2]);
debug("Testing with valid indices");
var bufferComplete = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, bufferComplete);
gl.bufferData(gl.ARRAY_BUFFER, dataComplete, gl.STATIC_DRAW);
var elements = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, elements);
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, indices, gl.STATIC_DRAW);
gl.useProgram(program);
var vertexLoc = gl.getAttribLocation(program, "a_vertex");
var normalLoc = gl.getAttribLocation(program, "a_normal");
gl.vertexAttribPointer(vertexLoc, 4, gl.FLOAT, false, 7 * sizeInBytes(gl.FLOAT), 0);
gl.enableVertexAttribArray(vertexLoc);
gl.vertexAttribPointer(normalLoc, 3, gl.FLOAT, false, 7 * sizeInBytes(gl.FLOAT), 4 * sizeInBytes(gl.FLOAT));
gl.enableVertexAttribArray(normalLoc);
shouldBe('gl.checkFramebufferStatus(gl.FRAMEBUFFER)', 'gl.FRAMEBUFFER_COMPLETE');
wtu.glErrorShouldBe(gl, gl.NO_ERROR);
shouldBeUndefined('gl.drawElements(gl.TRIANGLES, 3, gl.UNSIGNED_SHORT, 0)');
wtu.glErrorShouldBe(gl, gl.NO_ERROR);
debug("Testing with out-of-range indices");
var bufferIncomplete = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, bufferIncomplete);
gl.bufferData(gl.ARRAY_BUFFER, dataIncomplete, gl.STATIC_DRAW);
gl.vertexAttribPointer(vertexLoc, 4, gl.FLOAT, false, 7 * sizeInBytes(gl.FLOAT), 0);
gl.enableVertexAttribArray(vertexLoc);
gl.disableVertexAttribArray(normalLoc);
debug("Enable vertices, valid");
wtu.glErrorShouldBe(gl, gl.NO_ERROR);
shouldBeUndefined('gl.drawElements(gl.TRIANGLES, 3, gl.UNSIGNED_SHORT, 0)');
wtu.glErrorShouldBe(gl, gl.NO_ERROR);
debug("Enable normals, out-of-range");
gl.vertexAttribPointer(normalLoc, 3, gl.FLOAT, false, 7 * sizeInBytes(gl.FLOAT), 4 * sizeInBytes(gl.FLOAT));
gl.enableVertexAttribArray(normalLoc);
wtu.glErrorShouldBe(gl, gl.NO_ERROR);
shouldBeUndefined('gl.drawElements(gl.TRIANGLES, 3, gl.UNSIGNED_SHORT, 0)');
wtu.glErrorShouldBe(gl, [gl.INVALID_OPERATION, gl.NO_ERROR]);
debug("Test with enabled attribute that does not belong to current program");
gl.disableVertexAttribArray(normalLoc);
var extraLoc = Math.max(vertexLoc, normalLoc) + 1;
gl.enableVertexAttribArray(extraLoc);
debug("Enable an extra attribute with null");
wtu.glErrorShouldBe(gl, gl.NO_ERROR);
shouldBeUndefined('gl.drawElements(gl.TRIANGLES, 3, gl.UNSIGNED_SHORT, 0)');
wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION);
debug("Enable an extra attribute with insufficient data buffer");
gl.vertexAttribPointer(extraLoc, 3, gl.FLOAT, false, 7 * sizeInBytes(gl.FLOAT), 4 * sizeInBytes(gl.FLOAT));
wtu.glErrorShouldBe(gl, gl.NO_ERROR);
shouldBeUndefined('gl.drawElements(gl.TRIANGLES, 3, gl.UNSIGNED_SHORT, 0)');
debug("Pass large negative index to vertexAttribPointer");
gl.vertexAttribPointer(normalLoc, 3, gl.FLOAT, false, 7 * sizeInBytes(gl.FLOAT), -2000000000 * sizeInBytes(gl.FLOAT));
wtu.glErrorShouldBe(gl, gl.INVALID_VALUE);
shouldBeUndefined('gl.drawElements(gl.TRIANGLES, 3, gl.UNSIGNED_SHORT, 0)');
var successfullyParsed = true;
</script>
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