Add basic support for Android

3 files changed, 464 insertions, 1 deletions

diff --git a/src/android/ffi.rs b/src/android/ffi.rs
new file mode 100644
index 0000000..123a3f0
--- /dev/null
+++ b/src/android/ffi.rs
@@ -0,0 +1,252 @@
+#![allow(dead_code)]
+#![allow(non_snake_case)]
+#![allow(non_camel_case_types)]
+
+use libc;
+
+pub type EGLBoolean = libc::c_int;
+pub type EGLint = i32;
+pub type EGLDisplay = *const libc::c_void;
+pub type EGLConfig = *const libc::c_void;
+pub type EGLSurface = *const libc::c_void;
+pub type EGLContext = *const libc::c_void;
+
+pub type NativePixmapType = *const libc::c_void;     // FIXME: egl_native_pixmap_t instead
+pub type NativeWindowType = *const ANativeWindow;
+
+pub static EGL_DEFAULT_DISPLAY: EGLint = 0;
+/*pub static EGL_NO_CONTEXT: EGLContext = { use std::ptr; ptr::null() };
+pub static EGL_NO_DISPLAY: EGLDisplay = { use std::ptr; ptr::null() };
+pub static EGL_NO_SURFACE: EGLSurface = { use std::ptr; ptr::null() };*/
+
+pub static EGL_VERSION_1_0: EGLint = 1;
+pub static EGL_VERSION_1_1: EGLint = 1;
+
+pub static EGL_FALSE: EGLint = 0;
+pub static EGL_TRUE: EGLint = 1;
+
+pub static EGL_SUCCESS: EGLint = 0x3000;
+pub static EGL_NOT_INITIALIZED: EGLint = 0x3001;
+pub static EGL_BAD_ACCESS: EGLint = 0x3002;
+pub static EGL_BAD_ALLOC: EGLint = 0x3003;
+pub static EGL_BAD_ATTRIBUTE: EGLint = 0x3004;
+pub static EGL_BAD_CONFIG: EGLint = 0x3005;
+pub static EGL_BAD_CONTEXT: EGLint = 0x3006;
+pub static EGL_BAD_CURRENT_SURFACE: EGLint = 0x3007;
+pub static EGL_BAD_DISPLAY: EGLint = 0x3008;
+pub static EGL_BAD_MATCH: EGLint = 0x3009;
+pub static EGL_BAD_NATIVE_PIXMAP: EGLint = 0x300A;
+pub static EGL_BAD_NATIVE_WINDOW: EGLint = 0x300B;
+pub static EGL_BAD_PARAMETER: EGLint = 0x300C;
+pub static EGL_BAD_SURFACE: EGLint = 0x300D;
+pub static EGL_CONTEXT_LOST: EGLint = 0x300E;
+
+pub static EGL_BUFFER_SIZE: EGLint = 0x3020;
+pub static EGL_ALPHA_SIZE: EGLint = 0x3021;
+pub static EGL_BLUE_SIZE: EGLint = 0x3022;
+pub static EGL_GREEN_SIZE: EGLint = 0x3023;
+pub static EGL_RED_SIZE: EGLint = 0x3024;
+pub static EGL_DEPTH_SIZE: EGLint = 0x3025;
+pub static EGL_STENCIL_SIZE: EGLint = 0x3026;
+pub static EGL_CONFIG_CAVEAT: EGLint = 0x3027;
+pub static EGL_CONFIG_ID: EGLint = 0x3028;
+pub static EGL_LEVEL: EGLint = 0x3029;
+pub static EGL_MAX_PBUFFER_HEIGHT: EGLint = 0x302A;
+pub static EGL_MAX_PBUFFER_PIXELS: EGLint = 0x302B;
+pub static EGL_MAX_PBUFFER_WIDTH: EGLint = 0x302C;
+pub static EGL_NATIVE_RENDERABLE: EGLint = 0x302D;
+pub static EGL_NATIVE_VISUAL_ID: EGLint = 0x302E;
+pub static EGL_NATIVE_VISUAL_TYPE: EGLint = 0x302F;
+/*pub static EGL_PRESERVED_RESOURCES: EGLint = 0x3030;*/
+pub static EGL_SAMPLES: EGLint = 0x3031;
+pub static EGL_SAMPLE_BUFFERS: EGLint = 0x3032;
+pub static EGL_SURFACE_TYPE: EGLint = 0x3033;
+pub static EGL_TRANSPARENT_TYPE: EGLint = 0x3034;
+pub static EGL_TRANSPARENT_BLUE_VALUE: EGLint = 0x3035;
+pub static EGL_TRANSPARENT_GREEN_VALUE: EGLint = 0x3036;
+pub static EGL_TRANSPARENT_RED_VALUE: EGLint = 0x3037;
+pub static EGL_NONE: EGLint = 0x3038   /* Also a config value */;
+pub static EGL_BIND_TO_TEXTURE_RGB: EGLint = 0x3039;
+pub static EGL_BIND_TO_TEXTURE_RGBA: EGLint = 0x303A;
+pub static EGL_MIN_SWAP_INTERVAL: EGLint = 0x303B;
+pub static EGL_MAX_SWAP_INTERVAL: EGLint = 0x303C;
+
+
+pub static EGL_DONT_CARE: EGLint = -1;
+pub static EGL_SLOW_CONFIG: EGLint = 0x3050   /* EGL_CONFIG_CAVEAT value */;
+pub static EGL_NON_CONFORMANT_CONFIG: EGLint = 0x3051   /* " */;
+pub static EGL_TRANSPARENT_RGB: EGLint = 0x3052   /* EGL_TRANSPARENT_TYPE value */;
+pub static EGL_NO_TEXTURE: EGLint = 0x305C   /* EGL_TEXTURE_FORMAT/TARGET value */;
+pub static EGL_TEXTURE_RGB: EGLint = 0x305D   /* EGL_TEXTURE_FORMAT value */;
+pub static EGL_TEXTURE_RGBA: EGLint = 0x305E   /* " */;
+pub static EGL_TEXTURE_2D: EGLint = 0x305F   /* EGL_TEXTURE_TARGET value */;
+
+pub static EGL_PBUFFER_BIT: EGLint = 0x01 /* EGL_SURFACE_TYPE mask bit */;
+pub static EGL_PIXMAP_BIT: EGLint = 0x02 /* " */;
+pub static EGL_WINDOW_BIT: EGLint = 0x04 /* " */;
+
+pub static EGL_VENDOR: EGLint = 0x3053   /* eglQueryString target */;
+pub static EGL_VERSION: EGLint = 0x3054   /* " */;
+pub static EGL_EXTENSIONS: EGLint = 0x3055   /* " */;
+
+pub static EGL_HEIGHT: EGLint = 0x3056;
+pub static EGL_WIDTH: EGLint = 0x3057;
+pub static EGL_LARGEST_PBUFFER: EGLint = 0x3058;
+pub static EGL_TEXTURE_FORMAT: EGLint = 0x3080   /* For pbuffers bound as textures */;
+pub static EGL_TEXTURE_TARGET: EGLint = 0x3081   /* " */;
+pub static EGL_MIPMAP_TEXTURE: EGLint = 0x3082   /* " */;
+pub static EGL_MIPMAP_LEVEL: EGLint = 0x3083   /* " */;
+
+pub static EGL_BACK_BUFFER: EGLint = 0x3084;
+
+pub static EGL_DRAW: EGLint = 0x3059;
+pub static EGL_READ: EGLint = 0x305A;
+
+pub static EGL_CORE_NATIVE_ENGINE: EGLint = 0x305B;
+
+#[link(name = "android")]
+#[link(name = "EGL")]
+#[link(name = "GLESv2")]
+extern {
+    pub fn eglGetError() -> EGLint;
+
+    pub fn eglGetDisplay(display: *const ()/*NativeDisplayType*/) -> EGLDisplay;
+    pub fn eglInitialize(dpy: EGLDisplay, major: *mut EGLint, minor: *mut EGLint) -> EGLBoolean;
+    pub fn eglTerminate(dpy: EGLDisplay) -> EGLBoolean;
+    pub fn eglQueryString(dpy: EGLDisplay, name: EGLint) -> *const libc::c_char;
+    pub fn eglGetProcAddress(procname: *const libc::c_char) -> *const ();
+
+    pub fn eglGetConfigs(dpy: EGLDisplay, configs: *mut EGLConfig, config_size: EGLint,
+        num_config: *mut EGLint) -> EGLBoolean;
+    pub fn eglChooseConfig(dpy: EGLDisplay, attrib_list: *const EGLint, configs: *mut EGLConfig,
+        config_size: EGLint, num_config: *mut EGLint) -> EGLBoolean;
+    pub fn eglGetConfigAttrib(dpy: EGLDisplay, config: EGLConfig, attribute: EGLint,
+        value: *mut EGLint) -> EGLBoolean;
+
+    pub fn eglCreateWindowSurface(dpy: EGLDisplay, config: EGLConfig, window: NativeWindowType, attrib_list: *const EGLint) -> EGLSurface;
+    pub fn eglCreatePixmapSurface(dpy: EGLDisplay, config: EGLConfig, pixmap: NativePixmapType, attrib_list: *const EGLint) -> EGLSurface;
+    pub fn eglCreatePbufferSurface(dpy: EGLDisplay, config: EGLConfig,
+        attrib_list: *const EGLint) -> EGLSurface;
+    pub fn eglDestroySurface(dpy: EGLDisplay, surface: EGLSurface) -> EGLBoolean;
+    pub fn eglQuerySurface(dpy: EGLDisplay, surface: EGLSurface, attribute: EGLint,
+        value: *mut EGLint) -> EGLBoolean;
+
+    pub fn eglSurfaceAttrib(dpy: EGLDisplay, surface: EGLSurface, attribute: EGLint,
+        value: EGLint) -> EGLBoolean;
+    pub fn eglBindTexImage(dpy: EGLDisplay, surface: EGLSurface, buffer: EGLint) -> EGLBoolean;
+    pub fn eglReleaseTexImage(dpy: EGLDisplay, surface: EGLSurface, buffer: EGLint) -> EGLBoolean;
+
+    pub fn eglSwapInterval(dpy: EGLDisplay, interval: EGLint) -> EGLBoolean;
+
+    pub fn eglCreateContext(dpy: EGLDisplay, config: EGLConfig, share_list: EGLContext,
+        attrib_list: *const EGLint) -> EGLContext;
+    pub fn eglDestroyContext(dpy: EGLDisplay, ctx: EGLContext) -> EGLBoolean;
+    pub fn eglMakeCurrent(dpy: EGLDisplay, draw: EGLSurface, read: EGLSurface,
+        ctx: EGLContext) -> EGLBoolean;
+    pub fn eglGetCurrentContext() -> EGLContext;
+    pub fn eglGetCurrentSurface(readdraw: EGLint) -> EGLSurface;
+    pub fn eglGetCurrentDisplay() -> EGLDisplay;
+    pub fn eglQueryContext(dpy: EGLDisplay, ctx: EGLContext, attribute: EGLint,
+        value: *mut EGLint) -> EGLBoolean;
+
+    pub fn eglWaitGL() -> EGLBoolean;
+    pub fn eglWaitNative(engine: EGLint) -> EGLBoolean;
+    pub fn eglSwapBuffers(dpy: EGLDisplay, draw: EGLSurface) -> EGLBoolean;
+    //pub fn eglCopyBuffers(dpy: EGLDisplay, surface: EGLSurface, target: NativePixmapType) -> EGLBoolean;
+}
+
+/**
+ * asset_manager.h
+ */
+pub type AAssetManager = ();
+
+/**
+ * native_window.h
+ */
+pub type ANativeWindow = ();
+
+extern {
+    pub fn ANativeWindow_getHeight(window: *const ANativeWindow) -> libc::int32_t;
+    pub fn ANativeWindow_getWidth(window: *const ANativeWindow) -> libc::int32_t;
+}
+
+/**
+ * native_activity.h
+ */
+pub type JavaVM = ();
+pub type JNIEnv = ();
+pub type jobject = *const libc::c_void;
+
+pub type AInputQueue = ();  // FIXME: wrong
+pub type ARect = ();  // FIXME: wrong
+
+#[repr(C)]
+pub struct ANativeActivity {
+    pub callbacks: *mut ANativeActivityCallbacks,
+    pub vm: *mut JavaVM,
+    pub env: *mut JNIEnv,
+    pub clazz: jobject,
+    pub internalDataPath: *const libc::c_char,
+    pub externalDataPath: *const libc::c_char,
+    pub sdkVersion: libc::int32_t,
+    pub instance: *mut libc::c_void,
+    pub assetManager: *mut AAssetManager,
+    pub obbPath: *const libc::c_char,
+}
+
+#[repr(C)]
+pub struct ANativeActivityCallbacks {
+    pub onStart: extern fn(*mut ANativeActivity),
+    pub onResume: extern fn(*mut ANativeActivity),
+    pub onSaveInstanceState: extern fn(*mut ANativeActivity, *mut libc::size_t),
+    pub onPause: extern fn(*mut ANativeActivity),
+    pub onStop: extern fn(*mut ANativeActivity),
+    pub onDestroy: extern fn(*mut ANativeActivity),
+    pub onWindowFocusChanged: extern fn(*mut ANativeActivity, libc::c_int),
+    pub onNativeWindowCreated: extern fn(*mut ANativeActivity, *const ANativeWindow),
+    pub onNativeWindowResized: extern fn(*mut ANativeActivity, *const ANativeWindow),
+    pub onNativeWindowRedrawNeeded: extern fn(*mut ANativeActivity, *const ANativeWindow),
+    pub onNativeWindowDestroyed: extern fn(*mut ANativeActivity, *const ANativeWindow),
+    pub onInputQueueCreated: extern fn(*mut ANativeActivity, *mut AInputQueue),
+    pub onInputQueueDestroyed: extern fn(*mut ANativeActivity, *mut AInputQueue),
+    pub onContentRectChanged: extern fn(*mut ANativeActivity, *const ARect),
+    pub onConfigurationChanged: extern fn(*mut ANativeActivity),
+    pub onLowMemory: extern fn(*mut ANativeActivity),
+}
+
+/**
+ * looper.h
+ */
+pub type ALooper = ();
+
+#[link(name = "android")]
+extern {
+    pub fn ALooper_forThread() -> *const ALooper;
+    pub fn ALooper_acquire(looper: *const ALooper);
+    pub fn ALooper_release(looper: *const ALooper);
+    pub fn ALooper_prepare(opts: libc::c_int) -> *const ALooper;
+    pub fn ALooper_pollOnce(timeoutMillis: libc::c_int, outFd: *mut libc::c_int,
+        outEvents: *mut libc::c_int, outData: *mut *mut libc::c_void) -> libc::c_int;
+    pub fn ALooper_pollAll(timeoutMillis: libc::c_int, outFd: *mut libc::c_int,
+        outEvents: *mut libc::c_int, outData: *mut *mut libc::c_void) -> libc::c_int;
+    pub fn ALooper_wake(looper: *const ALooper);
+    pub fn ALooper_addFd(looper: *const ALooper, fd: libc::c_int, ident: libc::c_int,
+        events: libc::c_int, callback: ALooper_callbackFunc, data: *mut libc::c_void)
+        -> libc::c_int;
+    pub fn ALooper_removeFd(looper: *const ALooper, fd: libc::c_int) -> libc::c_int;
+}
+
+pub static ALOOPER_PREPARE_ALLOW_NON_CALLBACKS: libc::c_int = 1 << 0;
+
+pub static ALOOPER_POLL_WAKE: libc::c_int = -1;
+pub static ALOOPER_POLL_CALLBACK: libc::c_int = -2;
+pub static ALOOPER_POLL_TIMEOUT: libc::c_int = -3;
+pub static ALOOPER_POLL_ERROR: libc::c_int = -4;
+
+pub static ALOOPER_EVENT_INPUT: libc::c_int = 1 << 0;
+pub static ALOOPER_EVENT_OUTPUT: libc::c_int = 1 << 1;
+pub static ALOOPER_EVENT_ERROR: libc::c_int = 1 << 2;
+pub static ALOOPER_EVENT_HANGUP: libc::c_int = 1 << 3;
+pub static ALOOPER_EVENT_INVALID: libc::c_int = 1 << 4;
+
+pub type ALooper_callbackFunc = extern fn(libc::c_int, libc::c_int, *mut libc::c_void) -> libc::c_int;
diff --git a/src/android/mod.rs b/src/android/mod.rs
new file mode 100644
index 0000000..74a07e6
--- /dev/null
+++ b/src/android/mod.rs
@@ -0,0 +1,207 @@
+extern crate android_glue;
+extern crate native;
+
+use libc;
+use self::native::NativeTaskBuilder;
+use {Event, WindowBuilder};
+
+pub struct Window {
+    display: ffi::EGLDisplay,
+    context: ffi::EGLContext,
+    surface: ffi::EGLSurface,
+}
+
+pub struct MonitorID;
+
+mod ffi;
+
+compile_warning!("The Android implementation is not fully working yet")
+
+pub fn get_available_monitors() -> Vec<MonitorID> {
+    vec![ MonitorID ]
+}
+
+pub fn get_primary_monitor() -> MonitorID {
+    MonitorID
+}
+
+impl MonitorID {
+    pub fn get_name(&self) -> Option<String> {
+        Some("Primary".to_string())
+    }
+
+    pub fn get_dimensions(&self) -> (uint, uint) {
+        unimplemented!()
+    }
+}
+
+impl Window {
+    pub fn new(_builder: WindowBuilder) -> Result<Window, String> {
+        use std::{mem, ptr};
+        use std::task::TaskBuilder;
+
+        let native_window = unsafe { android_glue::get_native_window() };
+        if native_window.is_null() {
+            return Err(format!("Android's native window is null"));
+        }
+
+        let display = unsafe {
+            let display = ffi::eglGetDisplay(mem::transmute(ffi::EGL_DEFAULT_DISPLAY));
+            if display.is_null() {
+                return Err("No EGL display connection available".to_string());
+            }
+            display
+        };
+
+        android_glue::write_log("eglGetDisplay succeeded");
+
+        let (_major, _minor) = unsafe {
+            let mut major: ffi::EGLint = mem::uninitialized();
+            let mut minor: ffi::EGLint = mem::uninitialized();
+
+            if ffi::eglInitialize(display, &mut major, &mut minor) != ffi::EGL_TRUE {
+                return Err(format!("eglInitialize failed"))
+            }
+
+            (major, minor)
+        };
+
+        android_glue::write_log("eglInitialize succeeded");
+
+        let config = unsafe {
+            let attribute_list = [
+                ffi::EGL_RED_SIZE, 1,
+                ffi::EGL_GREEN_SIZE, 1,
+                ffi::EGL_BLUE_SIZE, 1,
+                ffi::EGL_NONE
+            ];
+
+            let mut num_config: ffi::EGLint = mem::uninitialized();
+            let mut config: ffi::EGLConfig = mem::uninitialized();
+            if ffi::eglChooseConfig(display, attribute_list.as_ptr(), &mut config, 1,
+                &mut num_config) != ffi::EGL_TRUE
+            {
+                return Err(format!("eglChooseConfig failed"))
+            }
+
+            if num_config <= 0 {
+                return Err(format!("eglChooseConfig returned no available config"))
+            }
+
+            config
+        };
+
+        android_glue::write_log("eglChooseConfig succeeded");
+
+        let context = unsafe {
+            let context = ffi::eglCreateContext(display, config, ptr::null(), ptr::null());
+            if context.is_null() {
+                return Err(format!("eglCreateContext failed"))
+            }
+            context
+        };
+
+        android_glue::write_log("eglCreateContext succeeded");
+
+        let surface = unsafe {
+            let surface = ffi::eglCreateWindowSurface(display, config, native_window, ptr::null());
+            if surface.is_null() {
+                return Err(format!("eglCreateWindowSurface failed"))
+            }
+            surface
+        };
+        
+        android_glue::write_log("eglCreateWindowSurface succeeded");
+
+        Ok(Window {
+            display: display,
+            context: context,
+            surface: surface,
+        })
+    }
+
+    pub fn is_closed(&self) -> bool {
+        false
+    }
+
+    pub fn set_title(&self, _: &str) {
+    }
+
+    pub fn get_position(&self) -> Option<(int, int)> {
+        None
+    }
+
+    pub fn set_position(&self, _x: int, _y: int) {
+    }
+
+    pub fn get_inner_size(&self) -> Option<(uint, uint)> {
+        let native_window = unsafe { android_glue::get_native_window() };
+
+        if native_window.is_null() {
+            None
+        } else {
+            Some((
+                unsafe { ffi::ANativeWindow_getWidth(native_window) } as uint,
+                unsafe { ffi::ANativeWindow_getHeight(native_window) } as uint
+            ))
+        }
+    }
+
+    pub fn get_outer_size(&self) -> Option<(uint, uint)> {
+        self.get_inner_size()
+    }
+
+    pub fn set_inner_size(&self, _x: uint, _y: uint) {
+    }
+
+    pub fn poll_events(&self) -> Vec<Event> {
+        use std::time::Duration;
+        use std::io::timer;
+        timer::sleep(Duration::milliseconds(16));
+        Vec::new()
+    }
+
+    pub fn wait_events(&self) -> Vec<Event> {
+        use std::time::Duration;
+        use std::io::timer;
+        timer::sleep(Duration::milliseconds(16));
+        Vec::new()
+    }
+
+    pub fn make_current(&self) {
+        unsafe {
+            ffi::eglMakeCurrent(self.display, self.surface, self.surface, self.context);
+        }
+    }
+
+    pub fn get_proc_address(&self, addr: &str) -> *const () {
+        use std::c_str::ToCStr;
+
+        unsafe {
+            addr.with_c_str(|s| {
+                ffi::eglGetProcAddress(s) as *const ()
+            })
+        }
+    }
+
+    pub fn swap_buffers(&self) {
+        unsafe {
+            ffi::eglSwapBuffers(self.display, self.surface);
+        }
+    }
+}
+
+#[unsafe_destructor]
+impl Drop for Window {
+    fn drop(&mut self) {
+        use std::ptr;
+
+        unsafe {
+            android_glue::write_log("Destroying gl-init window");
+            ffi::eglMakeCurrent(self.display, ptr::null(), ptr::null(), ptr::null());
+            ffi::eglDestroySurface(self.display, self.surface);
+            ffi::eglDestroyContext(self.display, self.context);
+            ffi::eglTerminate(self.display);
+        }
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
index a27337f..cfaf875 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -31,6 +31,8 @@ use win32 as winimpl;
 use x11 as winimpl;
 #[cfg(target_os = "macos")]
 use osx as winimpl;
+#[cfg(target_os = "android")]
+use android as winimpl;
 
 #[cfg(target_os = "windows")]
 mod win32;
@@ -38,13 +40,15 @@ mod win32;
 mod x11;
 #[cfg(target_os = "macos")]
 mod osx;
+#[cfg(target_os = "android")]
+mod android;
 
 #[allow(dead_code)]
 //mod egl;
 
 mod events;
 
-#[cfg(not(target_os = "windows"), not(target_os = "linux"), not(target_os = "macos"))]
+#[cfg(not(target_os = "windows"), not(target_os = "linux"), not(target_os = "macos"), not(target_os = "android"))]
 compile_error!("Only the `windows`, `linux` and `macos` platforms are supported")
 
 /// Identifier for a monitor.