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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.
-->
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>WebGL Program Handling Conformance Test</title>
<link rel="stylesheet" href="../../resources/js-test-style.css"/>
<script src="../../js/js-test-pre.js"></script>
<script src="../../js/desktop-gl-constants.js"></script>
<script src="../../js/webgl-test-utils.js"></script>
</head>
<body>
<script id="vshader" type="x-shader/x-vertex">
attribute vec4 a_position;
uniform vec4 u_color;
varying vec4 v_color;
void main()
{
v_color = u_color;
gl_Position = a_position;
}
</script>
<script id="fshader" type="x-shader/x-fragment">
precision mediump float;
varying vec4 v_color;
void main()
{
gl_FragColor = v_color;
}
</script>
<script id="fshader-not-link" type="x-shader/x-fragment">
precision mediump float;
varying vec4 foo;
void main()
{
gl_FragColor = foo;
}
</script>
<canvas id="canvas" width="16" height="16"> </canvas>
<div id="description"></div>
<div id="console"></div>
<script>
"use strict";
function compile(gl, shader, src) {
var shaderSource = document.getElementById(src).text;
gl.shaderSource(shader, shaderSource);
gl.compileShader(shader);
}
debug("");
debug("Canvas.getContext");
var wtu = WebGLTestUtils;
var gl = wtu.create3DContext("canvas");
if (!gl) {
testFailed("context does not exist");
}
function testProgramInvalidation() {
debug('');
debug('== Testing invalidation of the current program ==');
var vs = wtu.loadShaderFromScript(gl, "vshader");
var fs = wtu.loadShaderFromScript(gl, "fshader");
var prg = wtu.createProgram(gl, vs, fs);
gl.useProgram(prg);
const positionLoc = gl.getAttribLocation(prg, 'a_position');
const colorLoc = gl.getUniformLocation(prg, 'u_color');
wtu.setupUnitQuad(gl, positionLoc);
debug("Draw red with valid program");
gl.uniform4fv(colorLoc, [1, 0, 0, 1]);
wtu.drawUnitQuad(gl);
wtu.checkCanvas(gl, [255, 0, 0, 255], "should be red");
debug("Change fragment shader to one that will not link");
compile(gl, fs, "fshader-not-link");
debug("Draw orange");
gl.uniform4fv(colorLoc, [1, 127/255, 0, 1]);
wtu.drawUnitQuad(gl);
wtu.checkCanvas(gl, [255, 127, 0, 255], "should be orange");
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors before relink");
debug("Try linking");
gl.linkProgram(prg);
assertMsg(gl.getProgramParameter(prg, gl.LINK_STATUS) == false, "link should fail");
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors after linkProgram");
debug("Attempt to draw green; because link failed, in WebGL, the draw should generate INVALID_OPERATION");
gl.uniform4fv(colorLoc, [0, 1, 0, 1]);
wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "because the current program has been invalidated, uniform* calls generate INVALID_OPERATION");
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors before draw");
wtu.drawUnitQuad(gl);
wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "draw with invalidated program should fail");
wtu.checkCanvas(gl, [255, 127, 0, 255], "should still be orange");
}
function testProgramShaderRemoval() {
debug('');
debug('== Testing removal of shaders from the current program ==');
var vs = wtu.loadShaderFromScript(gl, "vshader");
var fs = wtu.loadShaderFromScript(gl, "fshader");
var prg = wtu.createProgram(gl, vs, fs);
gl.useProgram(prg);
const positionLoc = gl.getAttribLocation(prg, 'a_position');
const colorLoc = gl.getUniformLocation(prg, 'u_color');
wtu.setupUnitQuad(gl, positionLoc);
debug("Draw red with valid program");
gl.uniform4fv(colorLoc, [1, 0, 0, 1]);
wtu.drawUnitQuad(gl);
wtu.checkCanvas(gl, [255, 0, 0, 255], "should be red");
debug("Detach and delete shaders");
gl.detachShader(prg, vs);
gl.detachShader(prg, fs);
gl.deleteShader(vs);
gl.deleteShader(fs);
debug("Draw blue to show even though shaders are gone program is still valid");
gl.uniform4fv(colorLoc, [0, 0, 1, 1]);
wtu.drawUnitQuad(gl);
wtu.checkCanvas(gl, [0, 0, 255, 255], "should be blue");
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors");
}
testProgramInvalidation();
testProgramShaderRemoval();
var successfullyParsed = true;
</script>
<script src="../../js/js-test-post.js"></script>
</body>
</html>