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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>WebGL vertexAttribPointer Conformance Tests</title>
<script src="resources/desktop-gl-constants.js" type="text/javascript"></script>
<script src="../../../resources/js-test.js"></script>
<script src="resources/webgl-test.js"></script>
<script src="resources/webgl-test-utils.js"></script>
</head>
<body>
<div id="description"></div>
<div id="console"></div>
<canvas id="canvas" width="2" height="2"> </canvas>
<script>
description("This test checks vertexAttribPointer behaviors in WebGL.");
debug("");
debug("Canvas.getContext");
if (window.internals)
window.internals.settings.setWebGLErrorsToConsoleEnabled(false);
var wtu = WebGLTestUtils;
var gl = create3DContext(document.getElementById("canvas"));
if (!gl) {
testFailed("context does not exist");
} else {
testPassed("context exists");
debug("");
debug("Checking gl.vertexAttribPointer.");
if (!gl.FIXED) {
gl.FIXED = 0x140C;
}
gl.vertexAttribPointer(0, 3, gl.FLOAT, 0, 0, 12);
glErrorShouldBe(gl, gl.INVALID_OPERATION,
"vertexAttribPointer should fail if no buffer is bound");
var vertexObject = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(0), gl.STATIC_DRAW);
gl.vertexAttribPointer(0, 1, gl.INT, 0, 0, 0);
glErrorShouldBe(gl, gl.INVALID_ENUM,
"vertexAttribPointer should not support INT");
gl.vertexAttribPointer(0, 1, gl.UNSIGNED_INT, 0, 0, 0);
glErrorShouldBe(gl, gl.INVALID_ENUM,
"vertexAttribPointer should not support UNSIGNED_INT");
gl.vertexAttribPointer(0, 1, gl.FIXED, 0, 0, 0);
glErrorShouldBe(gl, gl.INVALID_ENUM,
"vertexAttribPointer should not support FIXED");
function checkVertexAttribPointer(
gl, err, reason, size, type, normalize, stride, offset) {
gl.vertexAttribPointer(0, size, type, normalize, stride, offset);
glErrorShouldBe(gl, err,
"gl.vertexAttribPointer(0, " + size +
", gl." + wtu.glEnumToString(gl, type) +
", " + normalize +
", " + stride +
", " + offset +
") should " + (err == gl.NO_ERROR ? "succeed " : "fail ") + reason);
}
var types = [
{ type:gl.BYTE, bytesPerComponent: 1 },
{ type:gl.UNSIGNED_BYTE, bytesPerComponent: 1 },
{ type:gl.SHORT, bytesPerComponent: 2 },
{ type:gl.UNSIGNED_SHORT, bytesPerComponent: 2 },
{ type:gl.FLOAT, bytesPerComponent: 4 },
];
for (var ii = 0; ii < types.length; ++ii) {
var info = types[ii];
debug("");
for (var size = 1; size <= 4; ++size) {
debug("");
debug("checking: " + wtu.glEnumToString(gl, info.type) + " with size " + size);
var bytesPerElement = size * info.bytesPerComponent;
var offsetSet;
if (info.bytesPerComponent > 1)
offsetSet = [0, info.bytesPerComponent - 1];
else
offsetSet = [0];
for (var jj = 0; jj < offsetSet.length; ++jj) {
var offset = offsetSet[jj];
var strideSet;
if (bytesPerElement > 1)
strideSet = [0, bytesPerElement - 1, bytesPerElement];
else
strideSet = [0, bytesPerElement];
for (var kk = 0; kk < strideSet.length; ++kk) {
var stride = strideSet[kk];
var err = gl.NO_ERROR;
var reason = ""
if (offset != 0) {
reason = "because offset is bad";
err = gl.INVALID_OPERATION;
}
if (stride % info.bytesPerComponent != 0) {
reason = "because stride is bad";
err = gl.INVALID_OPERATION;
}
checkVertexAttribPointer(
gl, err, reason, size, info.type, false, stride, offset);
}
var stride = Math.floor(255 / info.bytesPerComponent) * info.bytesPerComponent;
if (offset == 0) {
checkVertexAttribPointer(
gl, gl.NO_ERROR, "at stride limit",
size, info.type, false, stride, offset);
checkVertexAttribPointer(
gl, gl.INVALID_VALUE, "over stride limit",
size, info.type, false,
stride + info.bytesPerComponent, offset);
}
}
}
}
}
debug("");
</script>
</body>
</html>