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<!--
Copyright (c) 2022 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 WEBGL_provoking_vertex 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>
<canvas width="16" height="16" id="c"></canvas>
<div id="description"></div>
<div id="console"></div>
<script>
"use strict";
description("This test verifies the functionality of the WEBGL_provoking_vertex extension, if it is available.");
debug("");
var wtu = WebGLTestUtils;
var gl = wtu.create3DContext("c", null, 2);
var ext;
function runTestNoExtension() {
debug("");
debug("Check getParameter without the extension");
shouldBeNull("gl.getParameter(0x8E4F /* PROVOKING_VERTEX_WEBGL */)");
wtu.glErrorShouldBe(gl, gl.INVALID_ENUM, "parameter unknown without enabling the extension");
debug("");
}
function runTestExtension() {
debug("");
debug("Check enums");
shouldBe("ext.FIRST_VERTEX_CONVENTION_WEBGL", "0x8E4D");
shouldBe("ext.LAST_VERTEX_CONVENTION_WEBGL", "0x8E4E");
shouldBe("ext.PROVOKING_VERTEX_WEBGL", "0x8E4F");
debug("");
debug("Check default state");
shouldBe("gl.getParameter(ext.PROVOKING_VERTEX_WEBGL)", "ext.LAST_VERTEX_CONVENTION_WEBGL");
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "parameter known with the extension enabled");
debug("");
debug("Check state updates");
ext.provokingVertexWEBGL(ext.FIRST_VERTEX_CONVENTION_WEBGL);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "provokingVertexWEBGL(ext.FIRST_VERTEX_CONVENTION_WEBGL) generates no errors");
shouldBe("gl.getParameter(ext.PROVOKING_VERTEX_WEBGL)", "ext.FIRST_VERTEX_CONVENTION_WEBGL");
wtu.glErrorShouldBe(gl, gl.NO_ERROR);
ext.provokingVertexWEBGL(ext.LAST_VERTEX_CONVENTION_WEBGL);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "provokingVertexWEBGL(ext.LAST_VERTEX_CONVENTION_WEBGL) generates no errors");
shouldBe("gl.getParameter(ext.PROVOKING_VERTEX_WEBGL)", "ext.LAST_VERTEX_CONVENTION_WEBGL");
wtu.glErrorShouldBe(gl, gl.NO_ERROR);
debug("");
debug("Check invalid provoking vertex mode");
ext.provokingVertexWEBGL(ext.FIRST_VERTEX_CONVENTION_WEBGL);
ext.provokingVertexWEBGL(ext.PROVOKING_VERTEX_WEBGL);
wtu.glErrorShouldBe(gl, gl.INVALID_ENUM, "invalid provoking mode generates an error");
shouldBe("gl.getParameter(ext.PROVOKING_VERTEX_WEBGL)", "ext.FIRST_VERTEX_CONVENTION_WEBGL");
wtu.glErrorShouldBe(gl, gl.NO_ERROR);
debug("");
debug("Check provoking vertex operation");
const vs = `#version 300 es
in int intAttrib;
in vec2 position;
flat out int attrib;
void main() {
gl_Position = vec4(position, 0, 1);
attrib = intAttrib;
}`;
const fs = `#version 300 es
flat in int attrib;
out int fragColor;
void main() {
fragColor = attrib;
}`;
const program = wtu.setupProgram(gl, [vs, fs]);
gl.useProgram(program);
const tex = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, tex);
gl.texStorage2D(gl.TEXTURE_2D, 1, gl.R32I, 16, 16);
const fb = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, tex, 0);
const vb = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, vb);
const buf = new ArrayBuffer(36);
new Float32Array(buf, 0, 6).set([-1.0, -1.0, 3.0, -1.0, -1.0, 3.0]);
new Int32Array(buf, 24, 3).set([1, 2, 3]);
gl.bufferData(gl.ARRAY_BUFFER, buf, gl.STATIC_DRAW);
const positionLocation = gl.getAttribLocation(program, "position");
gl.enableVertexAttribArray(positionLocation);
gl.vertexAttribPointer(positionLocation, 2, gl.FLOAT, false, 0, 0);
const intAttribLocation = gl.getAttribLocation(program, "intAttrib");
gl.enableVertexAttribArray(intAttribLocation);
gl.vertexAttribIPointer(intAttribLocation, 1, gl.INT, 0, 24);
const pixel = new Int32Array(4);
ext.provokingVertexWEBGL(ext.LAST_VERTEX_CONVENTION_WEBGL);
gl.clearBufferiv(gl.COLOR, 0, new Int32Array(4));
gl.drawArrays(gl.TRIANGLES, 0, 3);
gl.readPixels(0, 0, 1, 1, gl.RGBA_INTEGER, gl.INT, pixel);
if (pixel[0] == 3) {
testPassed("Correct last provoking vertex");
} else {
testFailed("Incorrect last provoking vertex");
}
ext.provokingVertexWEBGL(ext.FIRST_VERTEX_CONVENTION_WEBGL);
gl.clearBufferiv(gl.COLOR, 0, new Int32Array(4));
gl.drawArrays(gl.TRIANGLES, 0, 3);
gl.readPixels(0, 0, 1, 1, gl.RGBA_INTEGER, gl.INT, pixel);
if (pixel[0] == 1) {
testPassed("Correct first provoking vertex");
} else {
testFailed("Incorrect first provoking vertex");
}
}
function runTest() {
if (!gl) {
testFailed("context does not exist");
} else {
testPassed("context exists");
runTestNoExtension();
ext = gl.getExtension("WEBGL_provoking_vertex");
wtu.runExtensionSupportedTest(gl, "WEBGL_provoking_vertex", ext !== null);
if (ext !== null) {
runTestExtension();
} else {
testPassed("No WEBGL_provoking_vertex support -- this is legal");
}
}
}
runTest();
var successfullyParsed = true;
</script>
<script src="../../js/js-test-post.js"></script>
</body>
</html>
|
