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Add: [Emscripten] Support for bootstrapping

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This commit is contained in:
glx22
2023-07-06 18:20:33 +02:00
committed by Loïc Guilloux
parent 3d1c4a8589
commit 4eddec9e79
4 changed files with 120 additions and 29 deletions
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76
src/bootstrap_gui.cpp
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@@ -286,6 +286,76 @@ public:
#endif /* defined(WITH_FREETYPE) */
#if defined(__EMSCRIPTEN__)
# include <emscripten.h>
# include "network/network.h"
# include "network/network_content.h"
# include "openttd.h"
# include "video/video_driver.hpp"
class BootstrapEmscripten : public ContentCallback {
bool downloading{false};
uint total_files{0};
uint total_bytes{0};
uint downloaded_bytes{0};
public:
BootstrapEmscripten()
{
_network_content_client.AddCallback(this);
_network_content_client.Connect();
}
~BootstrapEmscripten()
{
_network_content_client.RemoveCallback(this);
}
void OnConnect(bool success) override
{
if (!success) {
EM_ASM({ if (window["openttd_bootstrap_failed"]) openttd_bootstrap_failed(); });
return;
}
/* Once connected, request the metadata. */
_network_content_client.RequestContentList(CONTENT_TYPE_BASE_GRAPHICS);
}
void OnReceiveContentInfo(const ContentInfo *ci) override
{
if (this->downloading) return;
/* And once the metadata is received, start downloading it. */
_network_content_client.Select(ci->id);
_network_content_client.DownloadSelectedContent(this->total_files, this->total_bytes);
this->downloading = true;
EM_ASM({ if (window["openttd_bootstrap"]) openttd_bootstrap($0, $1); }, this->downloaded_bytes, this->total_bytes);
}
void OnDownloadProgress(const ContentInfo *ci, int bytes) override
{
/* A negative value means we are resetting; for example, when retrying or using a fallback. */
if (bytes < 0) {
this->downloaded_bytes = 0;
} else {
this->downloaded_bytes += bytes;
}
EM_ASM({ if (window["openttd_bootstrap"]) openttd_bootstrap($0, $1); }, this->downloaded_bytes, this->total_bytes);
}
void OnDownloadComplete(ContentID cid) override
{
/* _exit_game is used to break out of the outer video driver's MainLoop. */
_exit_game = true;
delete this;
}
};
#endif /* __EMSCRIPTEN__ */
/**
* Handle all procedures for bootstrapping OpenTTD without a base graphics set.
* This requires all kinds of trickery that is needed to avoid the use of
@@ -300,12 +370,15 @@ bool HandleBootstrap()
if (BlitterFactory::GetCurrentBlitter()->GetScreenDepth() == 0) goto failure;
/* If there is no network or no non-sprite font, then there is nothing we can do. Go straight to failure. */
#if (defined(_WIN32) && defined(WITH_UNISCRIBE)) || (defined(WITH_FREETYPE) && (defined(WITH_FONTCONFIG) || defined(__APPLE__))) || defined(WITH_COCOA)
#if defined(__EMSCRIPTEN__) || (defined(_WIN32) && defined(WITH_UNISCRIBE)) || (defined(WITH_FREETYPE) && (defined(WITH_FONTCONFIG) || defined(__APPLE__))) || defined(WITH_COCOA)
if (!_network_available) goto failure;
/* First tell the game we're bootstrapping. */
_game_mode = GM_BOOTSTRAP;
#if defined(__EMSCRIPTEN__)
new BootstrapEmscripten();
#else
/* Initialise the font cache. */
InitializeUnicodeGlyphMap();
/* Next "force" finding a suitable non-sprite font as the local font is missing. */
@@ -324,6 +397,7 @@ bool HandleBootstrap()
/* Finally ask the question. */
new BootstrapBackground();
new BootstrapAskForDownloadWindow();
#endif /* __EMSCRIPTEN__ */
/* Process the user events. */
VideoDriver::GetInstance()->MainLoop();