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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 Shader Translator</title>
<style>
textarea {
min-width: 70%;
min-height: 200px;
font-family: monospace;
background: #def;
}
#disabled {
color: red;
font-weight: bold;
}
</style>
<script>
// Needed by wtu.create3DContext():
var testFailed = function() {};
</script>
<script src="../js/webgl-test-utils.js"> </script>
<script>
"use strict";
window.onload = main;
var gl;
var debugShaders;
var enabledExtensions = [];
var translateButton;
var extButton;
function main() {
translateButton = document.getElementById('translate');
extButton = document.getElementById('getExts');
var wtu = WebGLTestUtils;
// Prioritize creating a WebGL 2 context if possible - if not, fall back to WebGL 1.
gl = wtu.create3DContext(undefined, undefined, 2);
if (!gl || !gl.getExtension('WEBGL_debug_shaders'))
{
gl = wtu.create3DContext();
}
if (!gl) {
disable();
return;
}
debugShaders = gl.getExtension('WEBGL_debug_shaders');
if (!debugShaders) {
disable();
}
}
function disable() {
translateButton.disabled = true;
extButton.disabled = true;
document.getElementById('disabled').style.display = 'block';
}
function getExtensions() {
getExtensionSet([
'EXT_frag_depth',
'EXT_shader_texture_lod',
'OES_standard_derivatives',
'WEBGL_draw_buffers'
]);
}
function getExtensionSet(shaderExtensions) {
for (var i = 0; i < shaderExtensions.length; ++i) {
if (enabledExtensions.indexOf(shaderExtensions[i]) < 0) {
var ext = gl.getExtension(shaderExtensions[i]);
if (ext) {
enabledExtensions.push(shaderExtensions[i]);
}
}
}
if (enabledExtensions.length > 0) {
document.getElementById('enabled-extensions').textContent = enabledExtensions.join(', ');
}
}
function translateShader() {
var sourceElement = document.getElementById('original-shader');
var source = sourceElement.value;
var output = document.getElementById('translated-shader');
var infoLog = document.getElementById('info-log');
var shaderType = document.getElementById('shader-type');
infoLog.value = '';
// Try compiling the source as both vertex and fragment shader and see if either one works
var tryCompile = function(type) {
var shader = gl.createShader(type);
gl.shaderSource(shader, source);
gl.compileShader(shader);
var shaderTypeStr;
if (type == gl.FRAGMENT_SHADER) {
shaderTypeStr = 'Fragment shader';
} else {
shaderTypeStr = 'Vertex shader';
}
if (gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
shaderType.textContent = shaderTypeStr;
var translatedSource = debugShaders.getTranslatedShaderSource(shader);
output.value = translatedSource;
infoLog.value = gl.getShaderInfoLog(shader);
return true;
} else {
infoLog.value += 'Info log when compiling as ' + shaderTypeStr + ':\n' + gl.getShaderInfoLog(shader) + '\n';
return false;
}
}
if (!tryCompile(gl.FRAGMENT_SHADER) && !tryCompile(gl.VERTEX_SHADER)) {
output.value = 'Invalid shader, compilation failed as both fragment and vertex shader.';
shaderType.textContent = 'Shader not';
}
}
</script>
</head>
<body>
<h1>WebGL Shader Translator</h1>
<p>This page uses the browser's built-in shader translation facilities to show how a shader
is changed before being passed on to the underlying platform's graphics driver.</p>
<p id="disabled" style="display: none;">
WebGL or WEBGL_debug_shaders extension is not available on this browser configuration.
Use a different browser or look for other alternatives to enable the extension to be able to use this page.
The extension might be behind a runtime flag for privacy considerations.
</p>
<h2>WebGL GLSL shader</h2>
<textarea id="original-shader"></textarea>
<p>
<input type="button" id="translate" value="Translate" onclick="translateShader()"></input>
<input type="button" id="getExts" value="Enable supported GLSL extensions" onclick="getExtensions()"></input>
</p>
<h2><span id="shader-type">Shader</span> translated for graphics driver</h2>
<textarea id="translated-shader"></textarea>
<h2>Enabled shader extensions</h2>
<p id="enabled-extensions">None</p>
<h2>Shader info log</h2>
<textarea id="info-log"></textarea>
</body>
</html>
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