godot/platform/javascript/export/export.cpp

/*************************************************************************/
/*  export.cpp                                                           */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2017 Godot Engine contributors (cf. AUTHORS.md)    */
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#include "editor/editor_node.h"
#include "editor_export.h"
#include "io/zip_io.h"
#include "platform/javascript/logo.gen.h"
#include "platform/javascript/run_icon.gen.h"

#define EXPORT_TEMPLATE_WEBASSEMBLY_RELEASE "webassembly_release.zip"
#define EXPORT_TEMPLATE_WEBASSEMBLY_DEBUG "webassembly_debug.zip"
#define EXPORT_TEMPLATE_ASMJS_RELEASE "javascript_release.zip"
#define EXPORT_TEMPLATE_ASMJS_DEBUG "javascript_debug.zip"

class EditorExportPlatformJavaScript : public EditorExportPlatform {

	GDCLASS(EditorExportPlatformJavaScript, EditorExportPlatform)

	Ref<ImageTexture> logo;
	Ref<ImageTexture> run_icon;
	bool runnable_when_last_polled;

	void _fix_html(Vector<uint8_t> &p_html, const Ref<EditorExportPreset> &p_preset, const String &p_name, bool p_debug);
	void _fix_fsloader_js(Vector<uint8_t> &p_js, const String &p_pack_name, uint64_t p_pack_size);

public:
	enum Target {
		TARGET_WEBASSEMBLY,
		TARGET_ASMJS
	};

	virtual void get_preset_features(const Ref<EditorExportPreset> &p_preset, List<String> *r_features);

	virtual void get_export_options(List<ExportOption> *r_options);
	virtual bool get_option_visibility(const String &p_option, const Map<StringName, Variant> &p_options) const;

	virtual String get_name() const;
	virtual Ref<Texture> get_logo() const;

	virtual bool can_export(const Ref<EditorExportPreset> &p_preset, String &r_error, bool &r_missing_templates) const;
	virtual String get_binary_extension() const;
	virtual Error export_project(const Ref<EditorExportPreset> &p_preset, bool p_debug, const String &p_path, int p_flags = 0);

	virtual bool poll_devices();
	virtual int get_device_count() const;
	virtual String get_device_name(int p_device) const { return TTR("Run in Browser"); }
	virtual String get_device_info(int p_device) const { return TTR("Run exported HTML in the system's default browser."); }
	virtual Error run(const Ref<EditorExportPreset> &p_preset, int p_device, int p_debug_flags);
	virtual Ref<Texture> get_run_icon() const;

	EditorExportPlatformJavaScript();
};

void EditorExportPlatformJavaScript::_fix_html(Vector<uint8_t> &p_html, const Ref<EditorExportPreset> &p_preset, const String &p_name, bool p_debug) {

	String str_template = String::utf8(reinterpret_cast<const char *>(p_html.ptr()), p_html.size());
	String str_export;
	Vector<String> lines = str_template.split("\n");

	int memory_mb;
	if (p_preset->get("options/target").operator int() != TARGET_ASMJS)
		// WebAssembly allows memory growth, so start with a reasonable default
		memory_mb = 1 << 4;
	else
		memory_mb = 1 << (p_preset->get("options/memory_size").operator int() + 5);

	for (int i = 0; i < lines.size(); i++) {

		String current_line = lines[i];
		current_line = current_line.replace("$GODOT_TMEM", itos(memory_mb * 1024 * 1024));
		current_line = current_line.replace("$GODOT_BASE", p_name);
		current_line = current_line.replace("$GODOT_HEAD_INCLUDE", p_preset->get("html/head_include"));
		current_line = current_line.replace("$GODOT_DEBUG_ENABLED", p_debug ? "true" : "false");
		str_export += current_line + "\n";
	}

	CharString cs = str_export.utf8();
	p_html.resize(cs.length());
	for (int i = 0; i < cs.length(); i++) {
		p_html[i] = cs[i];
	}
}

void EditorExportPlatformJavaScript::_fix_fsloader_js(Vector<uint8_t> &p_js, const String &p_pack_name, uint64_t p_pack_size) {

	String str_template = String::utf8(reinterpret_cast<const char *>(p_js.ptr()), p_js.size());
	String str_export;
	Vector<String> lines = str_template.split("\n");
	for (int i = 0; i < lines.size(); i++) {
		if (lines[i].find("$GODOT_PACK_NAME") != -1) {
			str_export += lines[i].replace("$GODOT_PACK_NAME", p_pack_name);
		} else if (lines[i].find("$GODOT_PACK_SIZE") != -1) {
			str_export += lines[i].replace("$GODOT_PACK_SIZE", itos(p_pack_size));
		} else {
			str_export += lines[i] + "\n";
		}
	}

	CharString cs = str_export.utf8();
	p_js.resize(cs.length());
	for (int i = 0; i < cs.length(); i++) {
		p_js[i] = cs[i];
	}
}

void EditorExportPlatformJavaScript::get_preset_features(const Ref<EditorExportPreset> &p_preset, List<String> *r_features) {

	if (p_preset->get("texture_format/s3tc")) {
		r_features->push_back("s3tc");
	}
	if (p_preset->get("texture_format/etc")) {
		r_features->push_back("etc");
	}
	if (p_preset->get("texture_format/etc2")) {
		r_features->push_back("etc2");
	}
}

void EditorExportPlatformJavaScript::get_export_options(List<ExportOption> *r_options) {

	r_options->push_back(ExportOption(PropertyInfo(Variant::INT, "options/target", PROPERTY_HINT_ENUM, "WebAssembly,asm.js"), TARGET_WEBASSEMBLY));
	r_options->push_back(ExportOption(PropertyInfo(Variant::INT, "options/memory_size", PROPERTY_HINT_ENUM, "32 MB,64 MB,128 MB,256 MB,512 MB,1 GB"), 3));
	r_options->push_back(ExportOption(PropertyInfo(Variant::BOOL, "texture_format/s3tc"), false));
	r_options->push_back(ExportOption(PropertyInfo(Variant::BOOL, "texture_format/etc"), true));
	r_options->push_back(ExportOption(PropertyInfo(Variant::BOOL, "texture_format/etc2"), false));
	r_options->push_back(ExportOption(PropertyInfo(Variant::STRING, "html/head_include", PROPERTY_HINT_MULTILINE_TEXT), ""));
	r_options->push_back(ExportOption(PropertyInfo(Variant::STRING, "custom_template/release", PROPERTY_HINT_GLOBAL_FILE, "zip"), ""));
	r_options->push_back(ExportOption(PropertyInfo(Variant::STRING, "custom_template/debug", PROPERTY_HINT_GLOBAL_FILE, "zip"), ""));
}

bool EditorExportPlatformJavaScript::get_option_visibility(const String &p_option, const Map<StringName, Variant> &p_options) const {

	if (p_option == "options/memory_size") {
		return p_options["options/target"].operator int() == TARGET_ASMJS;
	}
	return true;
}

String EditorExportPlatformJavaScript::get_name() const {

	return "HTML5";
}

Ref<Texture> EditorExportPlatformJavaScript::get_logo() const {

	return logo;
}

bool EditorExportPlatformJavaScript::can_export(const Ref<EditorExportPreset> &p_preset, String &r_error, bool &r_missing_templates) const {

	r_missing_templates = false;

	if (p_preset->get("options/target").operator int() == TARGET_WEBASSEMBLY) {
		if (find_export_template(EXPORT_TEMPLATE_WEBASSEMBLY_RELEASE) == String())
			r_missing_templates = true;
		else if (find_export_template(EXPORT_TEMPLATE_WEBASSEMBLY_DEBUG) == String())
			r_missing_templates = true;
	} else {
		if (find_export_template(EXPORT_TEMPLATE_ASMJS_RELEASE) == String())
			r_missing_templates = true;
		else if (find_export_template(EXPORT_TEMPLATE_ASMJS_DEBUG) == String())
			r_missing_templates = true;
	}

	return !r_missing_templates;
}

String EditorExportPlatformJavaScript::get_binary_extension() const {

	return "html";
}

Error EditorExportPlatformJavaScript::export_project(const Ref<EditorExportPreset> &p_preset, bool p_debug, const String &p_path, int p_flags) {

	String custom_debug = p_preset->get("custom_template/debug");
	String custom_release = p_preset->get("custom_template/release");

	String template_path = p_debug ? custom_debug : custom_release;

	template_path = template_path.strip_edges();

	if (template_path == String()) {

		if (p_preset->get("options/target").operator int() == TARGET_WEBASSEMBLY) {
			if (p_debug)
				template_path = find_export_template(EXPORT_TEMPLATE_WEBASSEMBLY_DEBUG);
			else
				template_path = find_export_template(EXPORT_TEMPLATE_WEBASSEMBLY_RELEASE);
		} else {
			if (p_debug)
				template_path = find_export_template(EXPORT_TEMPLATE_ASMJS_DEBUG);
			else
				template_path = find_export_template(EXPORT_TEMPLATE_ASMJS_RELEASE);
		}
	}

	if (template_path != String() && !FileAccess::exists(template_path)) {
		EditorNode::get_singleton()->show_warning(TTR("Template file not found:\n") + template_path);
		return ERR_FILE_NOT_FOUND;
	}

	String pck_path = p_path.get_basename() + ".pck";
	Error error = save_pack(p_preset, pck_path);
	if (error != OK) {
		EditorNode::get_singleton()->show_warning(TTR("Could not write file:\n") + pck_path);
		return error;
	}

	FileAccess *f = FileAccess::open(pck_path, FileAccess::READ);
	if (!f) {
		EditorNode::get_singleton()->show_warning(TTR("Could not read file:\n") + pck_path);
		return ERR_FILE_CANT_READ;
	}
	size_t pack_size = f->get_len();
	memdelete(f);

	FileAccess *src_f = NULL;
	zlib_filefunc_def io = zipio_create_io_from_file(&src_f);
	unzFile pkg = unzOpen2(template_path.utf8().get_data(), &io);

	if (!pkg) {

		EditorNode::get_singleton()->show_warning(TTR("Could not open template for export:\n") + template_path);
		return ERR_FILE_NOT_FOUND;
	}

	int ret = unzGoToFirstFile(pkg);
	while (ret == UNZ_OK) {

		//get filename
		unz_file_info info;
		char fname[16384];
		ret = unzGetCurrentFileInfo(pkg, &info, fname, 16384, NULL, 0, NULL, 0);

		String file = fname;

		Vector<uint8_t> data;
		data.resize(info.uncompressed_size);

		//read
		unzOpenCurrentFile(pkg);
		unzReadCurrentFile(pkg, data.ptr(), data.size());
		unzCloseCurrentFile(pkg);

		//write

		if (file == "godot.html") {

			_fix_html(data, p_preset, p_path.get_file().get_basename(), p_debug);
			file = p_path.get_file();
		} else if (file == "godotfs.js") {

			_fix_fsloader_js(data, pck_path.get_file(), pack_size);
			file = p_path.get_file().get_basename() + "fs.js";
		} else if (file == "godot.js") {

			file = p_path.get_file().get_basename() + ".js";
		} else if (file == "godot.wasm") {

			file = p_path.get_file().get_basename() + ".wasm";
		} else if (file == "godot.asm.js") {

			file = p_path.get_file().get_basename() + ".asm.js";
		} else if (file == "godot.mem") {

			file = p_path.get_file().get_basename() + ".mem";
		}

		String dst = p_path.get_base_dir().plus_file(file);
		FileAccess *f = FileAccess::open(dst, FileAccess::WRITE);
		if (!f) {
			EditorNode::get_singleton()->show_warning(TTR("Could not write file:\n") + dst);
			unzClose(pkg);
			return ERR_FILE_CANT_WRITE;
		}
		f->store_buffer(data.ptr(), data.size());
		memdelete(f);

		ret = unzGoToNextFile(pkg);
	}

	return OK;
}

bool EditorExportPlatformJavaScript::poll_devices() {

	Ref<EditorExportPreset> preset;

	for (int i = 0; i < EditorExport::get_singleton()->get_export_preset_count(); i++) {

		Ref<EditorExportPreset> ep = EditorExport::get_singleton()->get_export_preset(i);
		if (ep->is_runnable() && ep->get_platform() == this) {
			preset = ep;
			break;
		}
	}

	bool prev = runnable_when_last_polled;
	runnable_when_last_polled = preset.is_valid();
	return runnable_when_last_polled != prev;
}

int EditorExportPlatformJavaScript::get_device_count() const {

	return runnable_when_last_polled;
}

Error EditorExportPlatformJavaScript::run(const Ref<EditorExportPreset> &p_preset, int p_device, int p_debug_flags) {

	String path = EditorSettings::get_singleton()->get_settings_path() + "/tmp/tmp_export.html";
	Error err = export_project(p_preset, true, path, p_debug_flags);
	if (err) {
		return err;
	}
	OS::get_singleton()->shell_open(path);
	return OK;
}

Ref<Texture> EditorExportPlatformJavaScript::get_run_icon() const {

	return run_icon;
}

EditorExportPlatformJavaScript::EditorExportPlatformJavaScript() {

	Ref<Image> img = memnew(Image(_javascript_logo));
	logo.instance();
	logo->create_from_image(img);

	img = Ref<Image>(memnew(Image(_javascript_run_icon)));
	run_icon.instance();
	run_icon->create_from_image(img);

	runnable_when_last_polled = false;
}

void register_javascript_exporter() {

	Ref<EditorExportPlatformJavaScript> platform;
	platform.instance();
	EditorExport::get_singleton()->add_export_platform(platform);
}