Add Android backend
authorPekka Paalanen <ppaalanen@gmail.com>
Wed, 30 May 2012 12:53:45 +0000 (15:53 +0300)
committerKristian Høgsberg <krh@bitplanet.net>
Thu, 31 May 2012 17:54:01 +0000 (13:54 -0400)
The Android backend provides basic EGL/GLES2 graphics, where everything
is always composited. Overlays are not used. Input is stubbed, therefore
there is no input yet.

This adds the first C++ source file into Weston compositor. The Android
gralloc and fb HAL glue code to the Android EGL library is in C++, and
there is no way to access it from plain C. We have a simple wrapper to
the required C++ class API. Android forces the C++ file name extension
to .cpp.

The android backend is compiled by default. However, all Android
specific calls are protected with #ifdef ANDROID, so it will build also
without Android headers. The binary produced without the Android build
system is useless, but allows build-testing generic Weston changes.
Therefore the android backend is not installed.

Signed-off-by: Pekka Paalanen <ppaalanen@gmail.com>
configure.ac
src/Makefile.am
src/android-framebuffer.cpp [new file with mode: 0644]
src/android-framebuffer.h [new file with mode: 0644]
src/compositor-android.c [new file with mode: 0644]

index ad8a44a..d8865f9 100644 (file)
@@ -13,6 +13,7 @@ AM_SILENT_RULES([yes])
 
 # Check for programs
 AC_PROG_CC
+AC_PROG_CXX
 
 # Initialize libtool
 LT_PREREQ([2.2])
@@ -95,6 +96,17 @@ if test x$enable_wayland_compositor = xyes; then
   PKG_CHECK_MODULES(WAYLAND_COMPOSITOR, [wayland-client wayland-egl])
 fi
 
+
+AC_ARG_ENABLE(android-compositor,
+             AS_HELP_STRING([--disable-android-compositor],
+                            [do not build-test the Android 4.0 backend]),,
+             enable_android_compositor=yes)
+AM_CONDITIONAL(ENABLE_ANDROID_COMPOSITOR, test x$enable_android_compositor = xyes)
+if test x$enable_android_compositor = xyes; then
+  AC_DEFINE([BUILD_ANDROID_COMPOSITOR], [1], [Build the compositor for Android 4.0])
+fi
+
+
 AC_ARG_WITH(cairo-glesv2, AS_HELP_STRING([--with-cairo-glesv2],
               [Use GLESv2 cairo instead of full GL]),
               [cairo_modules="cairo-glesv2"],
index 7606211..ea81d33 100644 (file)
@@ -67,6 +67,10 @@ module_LTLIBRARIES =                         \
        $(wayland_backend)                      \
        $(openwfd_backend)
 
+# Do not install, since the binary produced via autotools is unusable.
+# The real backend is built by the Android build system.
+noinst_LTLIBRARIES = $(android_backend)
+
 if ENABLE_X11_COMPOSITOR
 x11_backend = x11-backend.la
 x11_backend_la_LDFLAGS = -module -avoid-version
@@ -121,6 +125,17 @@ openwfd_backend_la_CFLAGS = $(OPENWFD_COMPOSITOR_CFLAGS) $(GCC_CFLAGS)
 openwfd_backend_la_SOURCES = compositor-openwfd.c tty.c evdev.c evdev.h
 endif
 
+if ENABLE_ANDROID_COMPOSITOR
+android_backend = android-backend.la
+android_backend_la_LDFLAGS = -module -avoid-version
+android_backend_la_LIBADD = $(COMPOSITOR_LIBS)
+android_backend_la_CFLAGS = $(GCC_CFLAGS) $(COMPOSITOR_CFLAGS)
+android_backend_la_SOURCES = \
+       compositor-android.c \
+       android-framebuffer.cpp \
+       android-framebuffer.h
+endif
+
 if ENABLE_DESKTOP_SHELL
 desktop_shell = desktop-shell.la
 desktop_shell_la_LDFLAGS = -module -avoid-version
diff --git a/src/android-framebuffer.cpp b/src/android-framebuffer.cpp
new file mode 100644 (file)
index 0000000..1dfe9e8
--- /dev/null
@@ -0,0 +1,93 @@
+/*
+ * Copyright © 2012 Collabora, Ltd.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and
+ * its documentation for any purpose is hereby granted without fee, provided
+ * that the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name of the copyright holders not be used in
+ * advertising or publicity pertaining to distribution of the software
+ * without specific, written prior permission.  The copyright holders make
+ * no representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
+ * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
+ * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <cstdlib>
+
+#include "android-framebuffer.h"
+
+#ifdef ANDROID
+
+#include <ui/FramebufferNativeWindow.h>
+
+class AndroidFramebuffer {
+public:
+       int init();
+
+       struct android_framebuffer fb_;
+
+private:
+       android::sp<android::FramebufferNativeWindow> nativefb_;
+};
+
+int AndroidFramebuffer::init()
+{
+       struct ANativeWindow *window;
+       const framebuffer_device_t *fbdev;
+       int ret1, ret2, ret3;
+
+       nativefb_ = new android::FramebufferNativeWindow();
+       fbdev = nativefb_->getDevice();
+
+       if (!fbdev)
+               return -1;
+
+       fb_.priv = this;
+
+       window = nativefb_.get();
+       ret1 = window->query(window, NATIVE_WINDOW_WIDTH, &fb_.width);
+       ret2 = window->query(window, NATIVE_WINDOW_HEIGHT, &fb_.height);
+       ret3 = window->query(window, NATIVE_WINDOW_FORMAT, &fb_.format);
+       fb_.xdpi = window->xdpi;
+       fb_.ydpi = window->ydpi;
+       fb_.refresh_rate = fbdev->fps;
+
+       if (ret1 != android::NO_ERROR ||
+           ret2 != android::NO_ERROR ||
+           ret3 != android::NO_ERROR)
+               return -1;
+
+       fb_.native_window = reinterpret_cast<EGLNativeWindowType>(window);
+       return 0;
+}
+
+void
+android_framebuffer_destroy(struct android_framebuffer *fb)
+{
+       AndroidFramebuffer *afb = static_cast<AndroidFramebuffer*>(fb->priv);
+
+       delete afb;
+}
+
+struct android_framebuffer *
+android_framebuffer_create(void)
+{
+       AndroidFramebuffer *afb = new AndroidFramebuffer;
+
+       if (afb->init() < 0) {
+               delete afb;
+               return NULL;
+       }
+
+       return &afb->fb_;
+}
+
+#endif /* ANDROID */
diff --git a/src/android-framebuffer.h b/src/android-framebuffer.h
new file mode 100644 (file)
index 0000000..48b22e5
--- /dev/null
@@ -0,0 +1,54 @@
+/*
+ * Copyright © 2012 Collabora, Ltd.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and
+ * its documentation for any purpose is hereby granted without fee, provided
+ * that the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name of the copyright holders not be used in
+ * advertising or publicity pertaining to distribution of the software
+ * without specific, written prior permission.  The copyright holders make
+ * no representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
+ * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
+ * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef ANDROID_FRAMEBUFFER_H
+#define ANDROID_FRAMEBUFFER_H
+
+#include <EGL/egl.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct android_framebuffer {
+       EGLNativeWindowType native_window;
+       int width;
+       int height;
+       int format;
+       float xdpi;
+       float ydpi;
+       float refresh_rate;
+
+       void *priv;
+};
+
+void
+android_framebuffer_destroy(struct android_framebuffer *fb);
+
+struct android_framebuffer *
+android_framebuffer_create(void);
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /* ANDROID_FRAMEBUFFER_H */
diff --git a/src/compositor-android.c b/src/compositor-android.c
new file mode 100644 (file)
index 0000000..268538a
--- /dev/null
@@ -0,0 +1,444 @@
+/*
+ * Copyright © 2012 Collabora, Ltd.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and
+ * its documentation for any purpose is hereby granted without fee, provided
+ * that the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name of the copyright holders not be used in
+ * advertising or publicity pertaining to distribution of the software
+ * without specific, written prior permission.  The copyright holders make
+ * no representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
+ * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
+ * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+
+#include <EGL/egl.h>
+#include <GLES2/gl2.h>
+
+#include "compositor.h"
+#include "android-framebuffer.h"
+
+struct android_compositor;
+
+struct android_output {
+       struct android_compositor *compositor;
+       struct weston_output base;
+
+       struct weston_mode mode;
+       struct android_framebuffer *fb;
+       EGLSurface egl_surface;
+};
+
+struct android_seat {
+       struct weston_seat base;
+};
+
+struct android_compositor {
+       struct weston_compositor base;
+
+       struct android_seat *seat;
+};
+
+static inline struct android_output *
+to_android_output(struct weston_output *base)
+{
+       return container_of(base, struct android_output, base);
+}
+
+static inline struct android_compositor *
+to_android_compositor(struct weston_compositor *base)
+{
+       return container_of(base, struct android_compositor, base);
+}
+
+static const char *
+egl_error_string(EGLint code)
+{
+#define MYERRCODE(x) case x: return #x;
+       switch (code) {
+       MYERRCODE(EGL_SUCCESS)
+       MYERRCODE(EGL_NOT_INITIALIZED)
+       MYERRCODE(EGL_BAD_ACCESS)
+       MYERRCODE(EGL_BAD_ALLOC)
+       MYERRCODE(EGL_BAD_ATTRIBUTE)
+       MYERRCODE(EGL_BAD_CONTEXT)
+       MYERRCODE(EGL_BAD_CONFIG)
+       MYERRCODE(EGL_BAD_CURRENT_SURFACE)
+       MYERRCODE(EGL_BAD_DISPLAY)
+       MYERRCODE(EGL_BAD_SURFACE)
+       MYERRCODE(EGL_BAD_MATCH)
+       MYERRCODE(EGL_BAD_PARAMETER)
+       MYERRCODE(EGL_BAD_NATIVE_PIXMAP)
+       MYERRCODE(EGL_BAD_NATIVE_WINDOW)
+       MYERRCODE(EGL_CONTEXT_LOST)
+       default:
+               return "unknown";
+       }
+#undef MYERRCODE
+}
+
+static void
+print_egl_error_state(void)
+{
+       EGLint code;
+
+       code = eglGetError();
+       fprintf(stderr, "EGL error state: %s (0x%04lx)\n",
+               egl_error_string(code), (long)code);
+}
+
+static int
+android_output_make_current(struct android_output *output)
+{
+       struct android_compositor *compositor = output->compositor;
+       EGLBoolean ret;
+       static int errored;
+
+       ret = eglMakeCurrent(compositor->base.display, output->egl_surface,
+                            output->egl_surface, compositor->base.context);
+       if (ret == EGL_FALSE) {
+               if (errored)
+                       return -1;
+               errored = 1;
+               fprintf(stderr, "Failed to make EGL context current.\n");
+               print_egl_error_state();
+               return -1;
+       }
+
+       return 0;
+}
+
+static void
+android_finish_frame(void *data)
+{
+       struct android_output *output = data;
+
+       weston_output_finish_frame(&output->base,
+                                  weston_compositor_get_time());
+}
+
+static void
+android_output_repaint(struct weston_output *base, pixman_region32_t *damage)
+{
+       struct android_output *output = to_android_output(base);
+       struct android_compositor *compositor = output->compositor;
+       struct weston_surface *surface;
+       struct wl_event_loop *loop;
+       EGLBoolean ret;
+       static int errored;
+
+       if (android_output_make_current(output) < 0)
+               return;
+
+       wl_list_for_each_reverse(surface, &compositor->base.surface_list, link)
+               weston_surface_draw(surface, &output->base, damage);
+
+       weston_output_do_read_pixels(&output->base);
+
+       ret = eglSwapBuffers(compositor->base.display, output->egl_surface);
+       if (ret == EGL_FALSE && !errored) {
+               errored = 1;
+               fprintf(stderr, "Failed in eglSwapBuffers.\n");
+               print_egl_error_state();
+       }
+
+       /* FIXME: does Android have a way to signal page flip done? */
+       loop = wl_display_get_event_loop(compositor->base.wl_display);
+       wl_event_loop_add_idle(loop, android_finish_frame, output);
+}
+
+static void
+android_output_destroy(struct weston_output *base)
+{
+       struct android_output *output = to_android_output(base);
+
+       wl_list_remove(&output->base.link);
+       weston_output_destroy(&output->base);
+
+       android_framebuffer_destroy(output->fb);
+
+       free(output);
+}
+
+static struct android_output *
+android_output_create(struct android_compositor *compositor)
+{
+       struct android_output *output;
+
+       output = calloc(1, sizeof *output);
+       if (!output)
+               return NULL;
+
+       output->fb = android_framebuffer_create();
+       if (!output->fb) {
+               free(output);
+               return NULL;
+       }
+
+       output->compositor = compositor;
+       return output;
+}
+
+static void
+android_compositor_add_output(struct android_compositor *compositor,
+                             struct android_output *output)
+{
+       float mm_width, mm_height;
+
+       output->base.repaint = android_output_repaint;
+       output->base.destroy = android_output_destroy;
+       output->base.assign_planes = NULL;
+       output->base.set_backlight = NULL;
+       output->base.set_dpms = NULL;
+       output->base.switch_mode = NULL;
+
+       /* only one static mode in list */
+       output->mode.flags =
+               WL_OUTPUT_MODE_CURRENT | WL_OUTPUT_MODE_PREFERRED;
+       output->mode.width = output->fb->width;
+       output->mode.height = output->fb->height;
+       output->mode.refresh = ceilf(1000.0f * output->fb->refresh_rate);
+       wl_list_init(&output->base.mode_list);
+       wl_list_insert(&output->base.mode_list, &output->mode.link);
+
+       output->base.current = &output->mode;
+       output->base.origin = &output->mode;
+       output->base.subpixel = WL_OUTPUT_SUBPIXEL_UNKNOWN;
+       output->base.make = "unknown";
+       output->base.model = "unknown";
+
+       mm_width  = output->fb->width / output->fb->xdpi * 25.4f;
+       mm_height = output->fb->height / output->fb->ydpi * 25.4f;
+       weston_output_init(&output->base, &compositor->base,
+                          0, 0, round(mm_width), round(mm_height),
+                          WL_OUTPUT_FLIPPED);
+       wl_list_insert(compositor->base.output_list.prev, &output->base.link);
+}
+
+static void
+android_seat_destroy(struct android_seat *seat)
+{
+       weston_seat_release(&seat->base);
+       free(seat);
+}
+
+static struct android_seat *
+android_seat_create(struct android_compositor *compositor)
+{
+       struct android_seat *seat;
+
+       seat = calloc(1, sizeof *seat);
+       if (!seat)
+               return NULL;
+
+       weston_seat_init(&seat->base, &compositor->base);
+       compositor->base.seat = &seat->base;
+
+       return seat;
+}
+
+static int
+android_egl_choose_config(struct android_compositor *compositor,
+                         struct android_framebuffer *fb,
+                         const EGLint *attribs)
+{
+       EGLBoolean ret;
+       EGLint count = 0;
+       EGLint matched = 0;
+       EGLConfig *configs;
+       int i;
+
+       /*
+        * The logic is copied from Android frameworks/base/services/
+        * surfaceflinger/DisplayHardware/DisplayHardware.cpp
+        */
+
+       compositor->base.config = NULL;
+
+       ret = eglGetConfigs(compositor->base.display, NULL, 0, &count);
+       if (ret == EGL_FALSE || count < 1)
+               return -1;
+
+       configs = calloc(count, sizeof *configs);
+       if (!configs)
+               return -1;
+
+       ret = eglChooseConfig(compositor->base.display, attribs, configs,
+                             count, &matched);
+       if (ret == EGL_FALSE || matched < 1)
+               goto out;
+
+       for (i = 0; i < matched; ++i) {
+               EGLint id;
+               ret = eglGetConfigAttrib(compositor->base.display, configs[i],
+                                        EGL_NATIVE_VISUAL_ID, &id);
+               if (ret == EGL_FALSE)
+                       continue;
+               if (id > 0 && fb->format == id) {
+                       compositor->base.config = configs[i];
+                       break;
+               }
+       }
+
+out:
+       free(configs);
+       if (!compositor->base.config)
+               return -1;
+
+       return 0;
+}
+
+static int
+android_init_egl(struct android_compositor *compositor,
+                struct android_output *output)
+{
+       EGLint eglmajor, eglminor;
+       int ret;
+
+       static const EGLint context_attrs[] = {
+               EGL_CONTEXT_CLIENT_VERSION, 2,
+               EGL_NONE
+       };
+
+       static const EGLint config_attrs[] = {
+               EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
+               EGL_RED_SIZE, 1,
+               EGL_GREEN_SIZE, 1,
+               EGL_BLUE_SIZE, 1,
+               EGL_ALPHA_SIZE, 0,
+               EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
+               EGL_NONE
+       };
+
+       compositor->base.display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
+       if (compositor->base.display == EGL_NO_DISPLAY) {
+               fprintf(stderr, "Failed to create EGL display.\n");
+               print_egl_error_state();
+               return -1;
+       }
+
+       ret = eglInitialize(compositor->base.display, &eglmajor, &eglminor);
+       if (!ret) {
+               fprintf(stderr, "Failed to initialise EGL.\n");
+               print_egl_error_state();
+               return -1;
+       }
+
+       if (!eglBindAPI(EGL_OPENGL_ES_API)) {
+               fprintf(stderr, "Failed to bind EGL_OPENGL_ES_API.\n");
+               print_egl_error_state();
+               return -1;
+       }
+
+       ret = android_egl_choose_config(compositor, output->fb, config_attrs);
+       if (ret < 0) {
+               fprintf(stderr, "Failed to find an EGL config.\n");
+               print_egl_error_state();
+               return -1;
+       }
+
+       compositor->base.context = eglCreateContext(compositor->base.display,
+                                                   compositor->base.config,
+                                                   EGL_NO_CONTEXT,
+                                                   context_attrs);
+       if (compositor->base.context == EGL_NO_CONTEXT) {
+               fprintf(stderr, "Failed to create a GL ES 2 context.\n");
+               print_egl_error_state();
+               return -1;
+       }
+
+       output->egl_surface = eglCreateWindowSurface(compositor->base.display,
+                                                    compositor->base.config,
+                                                    output->fb->native_window,
+                                                    NULL);
+       if (output->egl_surface == EGL_NO_SURFACE) {
+               fprintf(stderr, "Failed to create FB EGLSurface.\n");
+               print_egl_error_state();
+               return -1;
+       }
+
+       if (android_output_make_current(output) < 0)
+               return -1;
+
+       return 0;
+}
+
+static void
+android_fini_egl(struct android_compositor *compositor)
+{
+       eglMakeCurrent(compositor->base.display,
+                      EGL_NO_SURFACE, EGL_NO_SURFACE,
+                      EGL_NO_CONTEXT);
+
+       eglTerminate(compositor->base.display);
+       eglReleaseThread();
+}
+
+static void
+android_compositor_destroy(struct weston_compositor *base)
+{
+       struct android_compositor *compositor = to_android_compositor(base);
+
+       android_seat_destroy(compositor->seat);
+
+       /* destroys outputs, too */
+       weston_compositor_shutdown(&compositor->base);
+
+       android_fini_egl(compositor);
+
+       free(compositor);
+}
+
+static struct weston_compositor *
+android_compositor_create(struct wl_display *display)
+{
+       struct android_compositor *compositor;
+       struct android_output *output;
+
+       compositor = calloc(1, sizeof *compositor);
+       if (compositor == NULL)
+               return NULL;
+
+       compositor->base.destroy = android_compositor_destroy;
+
+       compositor->base.focus = 1;
+
+       /* FIXME: all cleanup on failure is missing */
+
+       output = android_output_create(compositor);
+       if (!output)
+               return NULL;
+
+       if (android_init_egl(compositor, output) < 0)
+               return NULL;
+
+       if (weston_compositor_init(&compositor->base, display) < 0)
+               return NULL;
+
+       android_compositor_add_output(compositor, output);
+
+       compositor->seat = android_seat_create(compositor);
+       if (!compositor->seat)
+               return NULL;
+
+       return &compositor->base;
+}
+
+WL_EXPORT struct weston_compositor *
+backend_init(struct wl_display *display, int argc, char *argv[])
+{
+       return android_compositor_create(display);
+}