<?php

if ( ! file_exists(__DIR__ . "/../resources/gl.xml")) {
    copy("https://cvs.khronos.org/svn/repos/ogl/trunk/doc/registry/public/api/gl.xml", __DIR__ . "/../resources/gl.xml");
}

$xml = new DOMDocument();
$xml->loadXML(file_get_contents(__DIR__ . "/../resources/gl.xml"));

$commands = $xml->getElementsByTagName("commands")->item(0);

$data = file_get_contents(__DIR__ . "/../headers/gl.h");

$data .= "// GENERATED DATA START\n\n";

/** @var DOMNode $node */
foreach ($commands->childNodes as $node) {
    if ($node->nodeName !== "command") {
        continue;
    }

    /** @var DOMElement $node */
    $proto = $node->getElementsByTagName("proto")->item(0);

    /** @var DOMElement $name */
    $name = $proto->getElementsByTagName("name")[0];
    $name->remove();

    $returnType = trim($proto->textContent);
    $functionName = trim($name->textContent);

    $args = [];
    foreach ($node->getElementsByTagName("param") as $param) {
        $args[] = trim($param->textContent);
    }

    $data .= "typedef $returnType (* FUNC_$functionName) (" . implode(", ", $args) . ");\n";
}

file_put_contents(__DIR__ . "/../headers/gl_generated.h", $data);