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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.
*/
'use strict';
description("This test ensures clipping works with wide points whose centers are out of the viewport");
var wtu = WebGLTestUtils;
var gl = wtu.create3DContext("testbed", undefined, contextVersion);
var pointSize;
function setupProgram() {
var vs = "attribute vec4 pos;" +
"uniform float pointSize; " +
"void main() {" +
" gl_PointSize = pointSize;" +
" gl_Position = pos;" +
"}";
var fs = "precision mediump float;" +
"void main() {" +
" gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0);" +
"}";
var program = wtu.setupProgram(gl, [vs, fs], ['pos']);
if (program) {
var loc = gl.getUniformLocation(program, 'pointSize');
gl.uniform1f(loc, pointSize);
gl.vertexAttribPointer(0, 4, gl.FLOAT, false, 0, 0);
gl.enableVertexAttribArray(0);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors after setting up program");
}
return program;
}
function runOneTestCase(vertex) {
debug("");
debug("testing point at (" + vertex[0] + ", " + vertex[1] + ", " + vertex[2] + ")");
var data = new Float32Array(vertex);
gl.bufferSubData(gl.ARRAY_BUFFER, 0, data);
gl.clear(gl.COLOR_BUFFER_BIT);
gl.drawArrays(gl.POINTS, 0, 1);
wtu.checkCanvasRect(gl, 0, 0, 1, 1, [0, 255, 0]);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors after running one test case");
}
function runTests() {
if (!gl) {
testFailed("context does not exist");
return;
}
var range = gl.getParameter(gl.ALIASED_POINT_SIZE_RANGE);
if (range[1] < 2.0) {
testPassed("ALIASDED_POINT_SIZE_RANGE less than 2");
return;
}
pointSize = 2.0;
var data = new Float32Array(4);
var buffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
gl.bufferData(gl.ARRAY_BUFFER, data, gl.STATIC_DRAW);
var program = setupProgram();
if (!program) {
testFailed("fail to set up program");
return;
}
gl.disable(gl.BLEND);
gl.disable(gl.DITHER);
gl.disable(gl.DEPTH_TEST);
gl.clearColor(1.0, 0.0, 0.0, 1.0);
var vertices = [
[ 0.99, 0.5, 0.0, 1.0 ],
[ 1.01, 0.5, 0.0, 1.0 ],
[ 0.5, 0.99, 0.0, 1.0 ],
[ 0.5, 1.01, 0.0, 1.0 ],
];
for (var idx = 0; idx < vertices.length; ++idx) {
runOneTestCase(vertices[idx]);
}
}
runTests();
debug("");
var successfullyParsed = true;