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/*
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* Copyright © 2011 Benjamin Franzke
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting documentation, and
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* that the name of the copyright holders not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. The copyright holders make no representations
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* about the suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdbool.h>
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#include <math.h>
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#include <assert.h>
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#include <signal.h>
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#include <linux/input.h>
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#include <wayland-client.h>
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#include <wayland-egl.h>
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#include <wayland-cursor.h>
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#include <GLES2/gl2.h>
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#include <EGL/egl.h>
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struct window;
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struct seat;
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struct display {
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struct wl_display *display;
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struct wl_registry *registry;
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struct wl_compositor *compositor;
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struct wl_shell *shell;
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struct wl_seat *seat;
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struct wl_pointer *pointer;
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struct wl_keyboard *keyboard;
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struct wl_shm *shm;
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struct wl_cursor_theme *cursor_theme;
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struct wl_cursor *default_cursor;
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struct wl_surface *cursor_surface;
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struct {
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EGLDisplay dpy;
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EGLContext ctx;
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EGLConfig conf;
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} egl;
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struct window *window;
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};
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struct geometry {
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int width, height;
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};
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struct window {
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struct display *display;
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struct geometry geometry, window_size;
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struct {
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GLuint rotation_uniform;
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GLuint pos;
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GLuint col;
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} gl;
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struct wl_egl_window *native;
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struct wl_surface *surface;
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struct wl_shell_surface *shell_surface;
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EGLSurface egl_surface;
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struct wl_callback *callback;
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int fullscreen, configured, opaque;
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};
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static const char *vert_shader_text =
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"uniform mat4 rotation;\n"
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"attribute vec4 pos;\n"
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"attribute vec4 color;\n"
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"varying vec4 v_color;\n"
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"void main() {\n"
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" gl_Position = rotation * pos;\n"
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" v_color = color;\n"
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"}\n";
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static const char *frag_shader_text =
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"precision mediump float;\n"
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"varying vec4 v_color;\n"
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"void main() {\n"
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" gl_FragColor = v_color;\n"
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"}\n";
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static int running = 1;
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static void
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init_egl(struct display *display, int opaque)
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{
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static const EGLint context_attribs[] = {
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EGL_CONTEXT_CLIENT_VERSION, 2,
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EGL_NONE
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};
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EGLint config_attribs[] = {
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EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
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EGL_RED_SIZE, 1,
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EGL_GREEN_SIZE, 1,
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EGL_BLUE_SIZE, 1,
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EGL_ALPHA_SIZE, 1,
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EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
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EGL_NONE
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};
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EGLint major, minor, n;
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EGLBoolean ret;
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if (opaque)
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config_attribs[9] = 0;
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display->egl.dpy = eglGetDisplay(display->display);
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assert(display->egl.dpy);
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ret = eglInitialize(display->egl.dpy, &major, &minor);
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assert(ret == EGL_TRUE);
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ret = eglBindAPI(EGL_OPENGL_ES_API);
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assert(ret == EGL_TRUE);
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ret = eglChooseConfig(display->egl.dpy, config_attribs,
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&display->egl.conf, 1, &n);
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assert(ret && n == 1);
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display->egl.ctx = eglCreateContext(display->egl.dpy,
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display->egl.conf,
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EGL_NO_CONTEXT, context_attribs);
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assert(display->egl.ctx);
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}
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static void
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fini_egl(struct display *display)
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{
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/* Required, otherwise segfault in egl_dri2.c: dri2_make_current()
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* on eglReleaseThread(). */
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eglMakeCurrent(display->egl.dpy, EGL_NO_SURFACE, EGL_NO_SURFACE,
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EGL_NO_CONTEXT);
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eglTerminate(display->egl.dpy);
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eglReleaseThread();
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}
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static GLuint
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create_shader(struct window *window, const char *source, GLenum shader_type)
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{
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GLuint shader;
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GLint status;
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shader = glCreateShader(shader_type);
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assert(shader != 0);
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glShaderSource(shader, 1, (const char **) &source, NULL);
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glCompileShader(shader);
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glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
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if (!status) {
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char log[1000];
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GLsizei len;
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glGetShaderInfoLog(shader, 1000, &len, log);
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fprintf(stderr, "Error: compiling %s: %*s\n",
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shader_type == GL_VERTEX_SHADER ? "vertex" : "fragment",
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len, log);
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exit(1);
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}
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return shader;
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}
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static void
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init_gl(struct window *window)
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{
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GLuint frag, vert;
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GLuint program;
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GLint status;
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frag = create_shader(window, frag_shader_text, GL_FRAGMENT_SHADER);
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vert = create_shader(window, vert_shader_text, GL_VERTEX_SHADER);
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program = glCreateProgram();
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glAttachShader(program, frag);
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glAttachShader(program, vert);
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glLinkProgram(program);
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glGetProgramiv(program, GL_LINK_STATUS, &status);
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if (!status) {
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char log[1000];
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GLsizei len;
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glGetProgramInfoLog(program, 1000, &len, log);
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fprintf(stderr, "Error: linking:\n%*s\n", len, log);
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exit(1);
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}
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glUseProgram(program);
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window->gl.pos = 0;
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window->gl.col = 1;
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glBindAttribLocation(program, window->gl.pos, "pos");
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glBindAttribLocation(program, window->gl.col, "color");
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glLinkProgram(program);
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window->gl.rotation_uniform =
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glGetUniformLocation(program, "rotation");
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}
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static void
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handle_ping(void *data, struct wl_shell_surface *shell_surface,
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uint32_t serial)
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{
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wl_shell_surface_pong(shell_surface, serial);
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}
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static void
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handle_configure(void *data, struct wl_shell_surface *shell_surface,
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uint32_t edges, int32_t width, int32_t height)
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{
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struct window *window = data;
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if (window->native)
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wl_egl_window_resize(window->native, width, height, 0, 0);
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window->geometry.width = width;
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window->geometry.height = height;
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if (!window->fullscreen)
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window->window_size = window->geometry;
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}
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static void
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handle_popup_done(void *data, struct wl_shell_surface *shell_surface)
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{
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}
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static const struct wl_shell_surface_listener shell_surface_listener = {
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handle_ping,
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handle_configure,
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handle_popup_done
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};
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static void
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redraw(void *data, struct wl_callback *callback, uint32_t time);
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static void
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configure_callback(void *data, struct wl_callback *callback, uint32_t time)
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{
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struct window *window = data;
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wl_callback_destroy(callback);
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window->configured = 1;
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if (window->callback == NULL)
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redraw(data, NULL, time);
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}
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static struct wl_callback_listener configure_callback_listener = {
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configure_callback,
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};
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static void
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toggle_fullscreen(struct window *window, int fullscreen)
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{
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struct wl_callback *callback;
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window->fullscreen = fullscreen;
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window->configured = 0;
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if (fullscreen) {
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wl_shell_surface_set_fullscreen(window->shell_surface,
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WL_SHELL_SURFACE_FULLSCREEN_METHOD_DEFAULT,
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0, NULL);
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} else {
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wl_shell_surface_set_toplevel(window->shell_surface);
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handle_configure(window, window->shell_surface, 0,
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window->window_size.width,
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window->window_size.height);
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}
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callback = wl_display_sync(window->display->display);
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wl_callback_add_listener(callback, &configure_callback_listener,
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window);
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}
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static void
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create_surface(struct window *window)
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{
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struct display *display = window->display;
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EGLBoolean ret;
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window->surface = wl_compositor_create_surface(display->compositor);
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window->shell_surface = wl_shell_get_shell_surface(display->shell,
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window->surface);
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wl_shell_surface_add_listener(window->shell_surface,
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&shell_surface_listener, window);
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window->native =
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wl_egl_window_create(window->surface,
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window->window_size.width,
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window->window_size.height);
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window->egl_surface =
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eglCreateWindowSurface(display->egl.dpy,
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display->egl.conf,
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window->native, NULL);
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wl_shell_surface_set_title(window->shell_surface, "simple-egl");
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ret = eglMakeCurrent(window->display->egl.dpy, window->egl_surface,
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window->egl_surface, window->display->egl.ctx);
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assert(ret == EGL_TRUE);
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toggle_fullscreen(window, window->fullscreen);
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}
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static void
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destroy_surface(struct window *window)
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{
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wl_egl_window_destroy(window->native);
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wl_shell_surface_destroy(window->shell_surface);
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wl_surface_destroy(window->surface);
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if (window->callback)
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wl_callback_destroy(window->callback);
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}
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static const struct wl_callback_listener frame_listener;
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static void
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redraw(void *data, struct wl_callback *callback, uint32_t time)
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|
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{
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struct window *window = data;
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|
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static const GLfloat verts[3][2] = {
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|
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{ -0.5, -0.5 },
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|
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{ 0.5, -0.5 },
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|
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{ 0, 0.5 }
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};
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|
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static const GLfloat colors[3][3] = {
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|
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{ 1, 0, 0 },
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|
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{ 0, 1, 0 },
|
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|
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{ 0, 0, 1 }
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};
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|
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GLfloat angle;
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|
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GLfloat rotation[4][4] = {
|
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|
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{ 1, 0, 0, 0 },
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|
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{ 0, 1, 0, 0 },
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|
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{ 0, 0, 1, 0 },
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{ 0, 0, 0, 1 }
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};
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|
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static const int32_t speed_div = 5;
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|
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static uint32_t start_time = 0;
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|
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struct wl_region *region;
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assert(window->callback == callback);
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window->callback = NULL;
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|
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if (callback)
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|
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wl_callback_destroy(callback);
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|
|
if (!window->configured)
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return;
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|
|
if (start_time == 0)
|
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|
|
start_time = time;
|
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angle = ((time-start_time) / speed_div) % 360 * M_PI / 180.0;
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|
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rotation[0][0] = cos(angle);
|
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|
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rotation[0][2] = sin(angle);
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|
|
rotation[2][0] = -sin(angle);
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|
|
rotation[2][2] = cos(angle);
|
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|
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|
|
glViewport(0, 0, window->geometry.width, window->geometry.height);
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|
|
glUniformMatrix4fv(window->gl.rotation_uniform, 1, GL_FALSE,
|
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|
|
(GLfloat *) rotation);
|
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|
|
glClearColor(0.0, 0.0, 0.0, 0.5);
|
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|
|
glClear(GL_COLOR_BUFFER_BIT);
|
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|
|
glVertexAttribPointer(window->gl.pos, 2, GL_FLOAT, GL_FALSE, 0, verts);
|
|
|
|
glVertexAttribPointer(window->gl.col, 3, GL_FLOAT, GL_FALSE, 0, colors);
|
|
|
|
glEnableVertexAttribArray(window->gl.pos);
|
|
|
|
glEnableVertexAttribArray(window->gl.col);
|
|
|
|
|
|
|
|
glDrawArrays(GL_TRIANGLES, 0, 3);
|
|
|
|
|
|
|
|
glDisableVertexAttribArray(window->gl.pos);
|
|
|
|
glDisableVertexAttribArray(window->gl.col);
|
|
|
|
|
|
|
|
if (window->opaque || window->fullscreen) {
|
|
|
|
region = wl_compositor_create_region(window->display->compositor);
|
|
|
|
wl_region_add(region, 0, 0,
|
|
|
|
window->geometry.width,
|
|
|
|
window->geometry.height);
|
|
|
|
wl_surface_set_opaque_region(window->surface, region);
|
|
|
|
wl_region_destroy(region);
|
|
|
|
} else {
|
|
|
|
wl_surface_set_opaque_region(window->surface, NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
window->callback = wl_surface_frame(window->surface);
|
|
|
|
wl_callback_add_listener(window->callback, &frame_listener, window);
|
|
|
|
|
|
|
|
eglSwapBuffers(window->display->egl.dpy, window->egl_surface);
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct wl_callback_listener frame_listener = {
|
|
|
|
redraw
|
|
|
|
};
|
|
|
|
|
|
|
|
static void
|
|
|
|
pointer_handle_enter(void *data, struct wl_pointer *pointer,
|
|
|
|
uint32_t serial, struct wl_surface *surface,
|
|
|
|
wl_fixed_t sx, wl_fixed_t sy)
|
|
|
|
{
|
|
|
|
struct display *display = data;
|
|
|
|
struct wl_buffer *buffer;
|
|
|
|
struct wl_cursor *cursor = display->default_cursor;
|
|
|
|
struct wl_cursor_image *image;
|
|
|
|
|
|
|
|
if (display->window->fullscreen)
|
|
|
|
wl_pointer_set_cursor(pointer, serial, NULL, 0, 0);
|
|
|
|
else if (cursor) {
|
|
|
|
image = display->default_cursor->images[0];
|
|
|
|
buffer = wl_cursor_image_get_buffer(image);
|
|
|
|
wl_pointer_set_cursor(pointer, serial,
|
|
|
|
display->cursor_surface,
|
|
|
|
image->hotspot_x,
|
|
|
|
image->hotspot_y);
|
|
|
|
wl_surface_attach(display->cursor_surface, buffer, 0, 0);
|
|
|
|
wl_surface_damage(display->cursor_surface, 0, 0,
|
|
|
|
image->width, image->height);
|
|
|
|
wl_surface_commit(display->cursor_surface);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
pointer_handle_leave(void *data, struct wl_pointer *pointer,
|
|
|
|
uint32_t serial, struct wl_surface *surface)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
pointer_handle_motion(void *data, struct wl_pointer *pointer,
|
|
|
|
uint32_t time, wl_fixed_t sx, wl_fixed_t sy)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
pointer_handle_button(void *data, struct wl_pointer *wl_pointer,
|
|
|
|
uint32_t serial, uint32_t time, uint32_t button,
|
|
|
|
uint32_t state)
|
|
|
|
{
|
|
|
|
struct display *display = data;
|
|
|
|
|
|
|
|
if (button == BTN_LEFT && state == WL_POINTER_BUTTON_STATE_PRESSED)
|
|
|
|
wl_shell_surface_move(display->window->shell_surface,
|
|
|
|
display->seat, serial);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
pointer_handle_axis(void *data, struct wl_pointer *wl_pointer,
|
|
|
|
uint32_t time, uint32_t axis, wl_fixed_t value)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct wl_pointer_listener pointer_listener = {
|
|
|
|
pointer_handle_enter,
|
|
|
|
pointer_handle_leave,
|
|
|
|
pointer_handle_motion,
|
|
|
|
pointer_handle_button,
|
|
|
|
pointer_handle_axis,
|
|
|
|
};
|
|
|
|
|
|
|
|
static void
|
|
|
|
keyboard_handle_keymap(void *data, struct wl_keyboard *keyboard,
|
|
|
|
uint32_t format, int fd, uint32_t size)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
keyboard_handle_enter(void *data, struct wl_keyboard *keyboard,
|
|
|
|
uint32_t serial, struct wl_surface *surface,
|
|
|
|
struct wl_array *keys)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
keyboard_handle_leave(void *data, struct wl_keyboard *keyboard,
|
|
|
|
uint32_t serial, struct wl_surface *surface)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
keyboard_handle_key(void *data, struct wl_keyboard *keyboard,
|
|
|
|
uint32_t serial, uint32_t time, uint32_t key,
|
|
|
|
uint32_t state)
|
|
|
|
{
|
|
|
|
struct display *d = data;
|
|
|
|
|
|
|
|
if (key == KEY_F11 && state)
|
|
|
|
toggle_fullscreen(d->window, d->window->fullscreen ^ 1);
|
|
|
|
else if (key == KEY_ESC && state)
|
|
|
|
running = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
keyboard_handle_modifiers(void *data, struct wl_keyboard *keyboard,
|
|
|
|
uint32_t serial, uint32_t mods_depressed,
|
|
|
|
uint32_t mods_latched, uint32_t mods_locked,
|
|
|
|
uint32_t group)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct wl_keyboard_listener keyboard_listener = {
|
|
|
|
keyboard_handle_keymap,
|
|
|
|
keyboard_handle_enter,
|
|
|
|
keyboard_handle_leave,
|
|
|
|
keyboard_handle_key,
|
|
|
|
keyboard_handle_modifiers,
|
|
|
|
};
|
|
|
|
|
|
|
|
static void
|
|
|
|
seat_handle_capabilities(void *data, struct wl_seat *seat,
|
|
|
|
enum wl_seat_capability caps)
|
|
|
|
{
|
|
|
|
struct display *d = data;
|
|
|
|
|
|
|
|
if ((caps & WL_SEAT_CAPABILITY_POINTER) && !d->pointer) {
|
|
|
|
d->pointer = wl_seat_get_pointer(seat);
|
|
|
|
wl_pointer_add_listener(d->pointer, &pointer_listener, d);
|
|
|
|
} else if (!(caps & WL_SEAT_CAPABILITY_POINTER) && d->pointer) {
|
|
|
|
wl_pointer_destroy(d->pointer);
|
|
|
|
d->pointer = NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
if ((caps & WL_SEAT_CAPABILITY_KEYBOARD) && !d->keyboard) {
|
|
|
|
d->keyboard = wl_seat_get_keyboard(seat);
|
|
|
|
wl_keyboard_add_listener(d->keyboard, &keyboard_listener, d);
|
|
|
|
} else if (!(caps & WL_SEAT_CAPABILITY_KEYBOARD) && d->keyboard) {
|
|
|
|
wl_keyboard_destroy(d->keyboard);
|
|
|
|
d->keyboard = NULL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct wl_seat_listener seat_listener = {
|
|
|
|
seat_handle_capabilities,
|
|
|
|
};
|
|
|
|
|
|
|
|
static void
|
|
|
|
registry_handle_global(void *data, struct wl_registry *registry,
|
|
|
|
uint32_t name, const char *interface, uint32_t version)
|
|
|
|
{
|
|
|
|
struct display *d = data;
|
|
|
|
|
|
|
|
if (strcmp(interface, "wl_compositor") == 0) {
|
|
|
|
d->compositor =
|
|
|
|
wl_registry_bind(registry, name,
|
|
|
|
&wl_compositor_interface, 1);
|
|
|
|
} else if (strcmp(interface, "wl_shell") == 0) {
|
|
|
|
d->shell = wl_registry_bind(registry, name,
|
|
|
|
&wl_shell_interface, 1);
|
|
|
|
} else if (strcmp(interface, "wl_seat") == 0) {
|
|
|
|
d->seat = wl_registry_bind(registry, name,
|
|
|
|
&wl_seat_interface, 1);
|
|
|
|
wl_seat_add_listener(d->seat, &seat_listener, d);
|
|
|
|
} else if (strcmp(interface, "wl_shm") == 0) {
|
|
|
|
d->shm = wl_registry_bind(registry, name,
|
|
|
|
&wl_shm_interface, 1);
|
|
|
|
d->cursor_theme = wl_cursor_theme_load(NULL, 32, d->shm);
|
|
|
|
d->default_cursor =
|
|
|
|
wl_cursor_theme_get_cursor(d->cursor_theme, "left_ptr");
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
registry_handle_global_remove(void *data, struct wl_registry *registry,
|
|
|
|
uint32_t name)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct wl_registry_listener registry_listener = {
|
|
|
|
registry_handle_global,
|
|
|
|
registry_handle_global_remove
|
|
|
|
};
|
|
|
|
|
|
|
|
static void
|
|
|
|
signal_int(int signum)
|
|
|
|
{
|
|
|
|
running = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
usage(int error_code)
|
|
|
|
{
|
|
|
|
fprintf(stderr, "Usage: simple-egl [OPTIONS]\n\n"
|
|
|
|
" -f\tRun in fullscreen mode\n"
|
|
|
|
" -o\tCreate an opaque surface\n"
|
|
|
|
" -h\tThis help text\n\n");
|
|
|
|
|
|
|
|
exit(error_code);
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
main(int argc, char **argv)
|
|
|
|
{
|
|
|
|
struct sigaction sigint;
|
|
|
|
struct display display = { 0 };
|
|
|
|
struct window window = { 0 };
|
|
|
|
int i, ret = 0;
|
|
|
|
|
|
|
|
window.display = &display;
|
|
|
|
display.window = &window;
|
|
|
|
window.window_size.width = 250;
|
|
|
|
window.window_size.height = 250;
|
|
|
|
|
|
|
|
for (i = 1; i < argc; i++) {
|
|
|
|
if (strcmp("-f", argv[i]) == 0)
|
|
|
|
window.fullscreen = 1;
|
|
|
|
else if (strcmp("-o", argv[i]) == 0)
|
|
|
|
window.opaque = 1;
|
|
|
|
else if (strcmp("-h", argv[i]) == 0)
|
|
|
|
usage(EXIT_SUCCESS);
|
|
|
|
else
|
|
|
|
usage(EXIT_FAILURE);
|
|
|
|
}
|
|
|
|
|
|
|
|
display.display = wl_display_connect(NULL);
|
|
|
|
assert(display.display);
|
|
|
|
|
|
|
|
display.registry = wl_display_get_registry(display.display);
|
|
|
|
wl_registry_add_listener(display.registry,
|
|
|
|
®istry_listener, &display);
|
|
|
|
|
|
|
|
wl_display_dispatch(display.display);
|
|
|
|
|
|
|
|
init_egl(&display, window.opaque);
|
|
|
|
create_surface(&window);
|
|
|
|
init_gl(&window);
|
|
|
|
|
|
|
|
display.cursor_surface =
|
|
|
|
wl_compositor_create_surface(display.compositor);
|
|
|
|
|
|
|
|
sigint.sa_handler = signal_int;
|
|
|
|
sigemptyset(&sigint.sa_mask);
|
|
|
|
sigint.sa_flags = SA_RESETHAND;
|
|
|
|
sigaction(SIGINT, &sigint, NULL);
|
|
|
|
|
|
|
|
while (running && ret != -1)
|
|
|
|
ret = wl_display_dispatch(display.display);
|
|
|
|
|
|
|
|
fprintf(stderr, "simple-egl exiting\n");
|
|
|
|
|
|
|
|
destroy_surface(&window);
|
|
|
|
fini_egl(&display);
|
|
|
|
|
|
|
|
wl_surface_destroy(display.cursor_surface);
|
|
|
|
if (display.cursor_theme)
|
|
|
|
wl_cursor_theme_destroy(display.cursor_theme);
|
|
|
|
|
|
|
|
if (display.shell)
|
|
|
|
wl_shell_destroy(display.shell);
|
|
|
|
|
|
|
|
if (display.compositor)
|
|
|
|
wl_compositor_destroy(display.compositor);
|
|
|
|
|
|
|
|
wl_registry_destroy(display.registry);
|
|
|
|
wl_display_flush(display.display);
|
|
|
|
wl_display_disconnect(display.display);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|