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Merged Ryan's SDL-gui-backend branch.
Adds three APIs, and implements them on X11, Cocoa, and Windows: - SDL_CaptureMouse() - SDL_GetGlobalMouseState() - SDL_SetWindowHitTest()
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| Original file line number | Diff line number | Diff line change |
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| ================================================================================ | ||
| Simple DirectMedia Layer for Native Client | ||
| ================================================================================ | ||
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| Requirements: | ||
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| * Native Client SDK (https://developer.chrome.com/native-client), | ||
| (tested with Pepper version 33 or higher). | ||
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| 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! | ||
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| ================================================================================ | ||
| Building SDL for NaCl | ||
| ================================================================================ | ||
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| Set up the right environment variables (see naclbuild.sh), then configure SDL with: | ||
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| configure --host=pnacl --prefix some/install/destination | ||
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| Then "make". | ||
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| 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! | ||
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| ================================================================================ | ||
| Running tests | ||
| ================================================================================ | ||
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| 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. | ||
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| Basic usage: | ||
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| ./naclbuild.sh path/to/pepper/toolchain (i.e. ~/naclsdk/pepper_35) | ||
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| This will build testgles2.c by default. | ||
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| If you want to build a different test, for example testrendercopyex.c: | ||
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| SOURCES=~/sdl/SDL/test/testrendercopyex.c ./naclbuild.sh ~/naclsdk/pepper_35 | ||
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| 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). | ||
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| ================================================================================ | ||
| RWops and nacl_io | ||
| ================================================================================ | ||
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| SDL_RWops work transparently with nacl_io. Two functions control the mount points: | ||
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| int mount(const char* source, const char* target, | ||
| const char* filesystemtype, | ||
| unsigned long mountflags, const void *data); | ||
| int umount(const char *target); | ||
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| 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: | ||
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| umount("/"); | ||
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| And then mounting a different filesystem at / | ||
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| 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. | ||
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| For more information on how nacl_io and mount points work, see: | ||
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| 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 | ||
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| To be able to save into the directory "/save/" (like backup of game) : | ||
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| mount("", "/save", "html5fs", 0, "type=PERSISTENT"); | ||
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| And add to manifest.json : | ||
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| "permissions": [ | ||
| "unlimitedStorage" | ||
| ] | ||
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| ================================================================================ | ||
| 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 | ||
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