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<!--
Copyright (c) 2023 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 EXT_polygon_offset_clamp 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="32" height="32" id="c"></canvas>
<div id="description"></div>
<div id="console"></div>
<script>
"use strict";
description("This test verifies the functionality of the EXT_polygon_offset_clamp extension, if it is available.");
debug("");
var wtu = WebGLTestUtils;
var gl = wtu.create3DContext();
var ext;
const w = gl.drawingBufferWidth;
const h = gl.drawingBufferHeight;
function runTestNoExtension() {
debug("");
debug("Check the parameter without the extension");
shouldBeNull("gl.getParameter(0x8E1B /* POLYGON_OFFSET_CLAMP_EXT */)");
wtu.glErrorShouldBe(gl, gl.INVALID_ENUM, "parameter unknown without enabling the extension");
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors");
}
function checkEnums() {
debug("");
debug("Check enums");
shouldBe("ext.POLYGON_OFFSET_CLAMP_EXT", "0x8E1B");
}
function checkQueries() {
debug("");
debug("Check default state");
shouldBe('gl.getParameter(gl.POLYGON_OFFSET_FACTOR)', '0.0');
shouldBe('gl.getParameter(gl.POLYGON_OFFSET_UNITS)', '0.0');
shouldBe('gl.getParameter(ext.POLYGON_OFFSET_CLAMP_EXT)', '0.0');
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors");
debug("");
debug("Check state update using the new function");
ext.polygonOffsetClampEXT(1.0, 2.0, 3.0);
shouldBe('gl.getParameter(gl.POLYGON_OFFSET_FACTOR)', '1.0');
shouldBe('gl.getParameter(gl.POLYGON_OFFSET_UNITS)', '2.0');
shouldBe('gl.getParameter(ext.POLYGON_OFFSET_CLAMP_EXT)', '3.0');
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors");
debug("");
debug("Check that the unextended function resets the clamp value to zero");
gl.polygonOffset(4.0, 5.0);
shouldBe('gl.getParameter(gl.POLYGON_OFFSET_FACTOR)', '4.0');
shouldBe('gl.getParameter(gl.POLYGON_OFFSET_UNITS)', '5.0');
shouldBe('gl.getParameter(ext.POLYGON_OFFSET_CLAMP_EXT)', '0.0');
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors");
}
function checkClamping() {
debug("");
debug("Check polygon offset clamp operation");
// The shader creates a depth slope from left (0) to right (1).
//
// This test issues two draw calls:
//
// Draw 2 (green): factor width, offset 0, clamp 0.5, depth test: Greater
// ^ | __________________
// | | __/ __/
// | V __/ __/ <--- Draw 1 (red): factor width, offset 0, clamp 0.25
// | __/ __/
// | __/ __/
// |/ __/
// | __/
// | __/
// |/
// |
// |
// +------------------------------->
//
// Result: <---------green--------><--red-->
const program = wtu.setupProgram(gl, [wtu.simpleVertexShader,
wtu.simpleColorFragmentShader]);
gl.useProgram(program);
const colorLoc = gl.getUniformLocation(program, "u_color");
const buf = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, buf);
gl.bufferData(
gl.ARRAY_BUFFER,
new Float32Array([-1, -1, -1, 1, -1, 1, -1, 1, -1, 1, 1, 1]),
gl.STATIC_DRAW);
gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0);
gl.enableVertexAttribArray(0);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors");
gl.enable(gl.POLYGON_OFFSET_FILL);
gl.clearColor(0, 0, 0, 1);
gl.clearDepth(0);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
gl.enable(gl.DEPTH_TEST);
gl.depthFunc(gl.ALWAYS);
gl.uniform4f(colorLoc, 1, 0, 0, 1);
ext.polygonOffsetClampEXT(w, 0, 0.25);
gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4);
gl.depthFunc(gl.GREATER);
gl.uniform4f(colorLoc, 0, 1, 0, 1);
ext.polygonOffsetClampEXT(w, 0, 0.5);
gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4);
wtu.checkCanvasRect(
gl,
0, 0, 3 * w / 4 - 1, h,
[0, 255, 0, 255], "should be green");
wtu.checkCanvasRect(
gl,
3 * w / 4 + 1, 0, w / 4 - 1, h,
[255, 0, 0, 255], "should be red");
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors");
}
function runTestExtension() {
checkEnums();
checkQueries();
checkClamping();
}
function runTest() {
if (!gl) {
testFailed("WebGL context does not exist");
return;
}
testPassed("WebGL context exists");
runTestNoExtension();
ext = gl.getExtension("EXT_polygon_offset_clamp");
wtu.runExtensionSupportedTest(gl, "EXT_polygon_offset_clamp", ext !== null);
if (ext !== null) {
runTestExtension();
} else {
testPassed("No EXT_polygon_offset_clamp support -- this is legal");
}
}
runTest();
var successfullyParsed = true;
</script>
<script src="../../js/js-test-post.js"></script>
</body>
</html>
|
