|
@@ -1,103 +0,0 @@
|
|
|
-Native Client
|
|
|
-================================================================================
|
|
|
-
|
|
|
-Requirements:
|
|
|
-
|
|
|
-* Native Client SDK (https://developer.chrome.com/native-client),
|
|
|
- (tested with Pepper version 33 or higher).
|
|
|
-
|
|
|
-The SDL backend for Chrome's Native Client has been tested only with the PNaCl
|
|
|
-toolchain, which generates binaries designed to run on ARM and x86_32/64
|
|
|
-platforms. This does not mean it won't work with the other toolchains!
|
|
|
-
|
|
|
-================================================================================
|
|
|
-Building SDL for NaCl
|
|
|
-================================================================================
|
|
|
-
|
|
|
-Set up the right environment variables (see naclbuild.sh), then configure SDL with:
|
|
|
-
|
|
|
- configure --host=pnacl --prefix some/install/destination
|
|
|
-
|
|
|
-Then "make".
|
|
|
-
|
|
|
-As an example of how to create a deployable app a Makefile project is provided
|
|
|
-in test/nacl/Makefile, which includes some monkey patching of the common.mk file
|
|
|
-provided by NaCl, without which linking properly to SDL won't work (the search
|
|
|
-path can't be modified externally, so the linker won't find SDL's binaries unless
|
|
|
-you dump them into the SDK path, which is inconvenient).
|
|
|
-Also provided in test/nacl is the required support file, such as index.html,
|
|
|
-manifest.json, etc.
|
|
|
-SDL apps for NaCl run on a worker thread using the ppapi_simple infrastructure.
|
|
|
-This allows for blocking calls on all the relevant systems (OpenGL ES, filesystem),
|
|
|
-hiding the asynchronous nature of the browser behind the scenes...which is not the
|
|
|
-same as making it disappear!
|
|
|
-
|
|
|
-
|
|
|
-================================================================================
|
|
|
-Running tests
|
|
|
-================================================================================
|
|
|
-
|
|
|
-Due to the nature of NaCl programs, building and running SDL tests is not as
|
|
|
-straightforward as one would hope. The script naclbuild.sh in build-scripts
|
|
|
-automates the process and should serve as a guide for users of SDL trying to build
|
|
|
-their own applications.
|
|
|
-
|
|
|
-Basic usage:
|
|
|
-
|
|
|
- ./naclbuild.sh path/to/pepper/toolchain (i.e. ~/naclsdk/pepper_35)
|
|
|
-
|
|
|
-This will build testgles2.c by default.
|
|
|
-
|
|
|
-If you want to build a different test, for example testrendercopyex.c:
|
|
|
-
|
|
|
- SOURCES=~/sdl/SDL/test/testrendercopyex.c ./naclbuild.sh ~/naclsdk/pepper_35
|
|
|
-
|
|
|
-Once the build finishes, you have to serve the contents with a web server (the
|
|
|
-script will give you instructions on how to do that with Python).
|
|
|
-
|
|
|
-================================================================================
|
|
|
-RWops and nacl_io
|
|
|
-================================================================================
|
|
|
-
|
|
|
-SDL_RWops work transparently with nacl_io. Two functions control the mount points:
|
|
|
-
|
|
|
- int mount(const char* source, const char* target,
|
|
|
- const char* filesystemtype,
|
|
|
- unsigned long mountflags, const void *data);
|
|
|
- int umount(const char *target);
|
|
|
-
|
|
|
- For convenience, SDL will by default mount an httpfs tree at / before calling
|
|
|
-the app's main function. Such setting can be overridden by calling:
|
|
|
-
|
|
|
- umount("/");
|
|
|
-
|
|
|
-And then mounting a different filesystem at /
|
|
|
-
|
|
|
-It's important to consider that the asynchronous nature of file operations on a
|
|
|
-browser is hidden from the application, effectively providing the developer with
|
|
|
-a set of blocking file operations just like you get in a regular desktop
|
|
|
-environment, which eases the job of porting to Native Client, but also introduces
|
|
|
-a set of challenges of its own, in particular when big file sizes and slow
|
|
|
-connections are involved.
|
|
|
-
|
|
|
-For more information on how nacl_io and mount points work, see:
|
|
|
-
|
|
|
- https://developer.chrome.com/native-client/devguide/coding/nacl_io
|
|
|
- https://src.chromium.org/chrome/trunk/src/native_client_sdk/src/libraries/nacl_io/nacl_io.h
|
|
|
-
|
|
|
-To be able to save into the directory "/save/" (like backup of game) :
|
|
|
-
|
|
|
- mount("", "/save", "html5fs", 0, "type=PERSISTENT");
|
|
|
-
|
|
|
-And add to manifest.json :
|
|
|
-
|
|
|
- "permissions": [
|
|
|
- "unlimitedStorage"
|
|
|
- ]
|
|
|
-
|
|
|
-================================================================================
|
|
|
-TODO - Known Issues
|
|
|
-================================================================================
|
|
|
-* Testing of all systems with a real application (something other than SDL's tests)
|
|
|
-* Key events don't seem to work properly
|
|
|
-
|