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compositor.c

/*
 * Copyright © 2008 Kristian Høgsberg
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#define _GNU_SOURCE

#include "config.h"

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include <limits.h>
#include <stdarg.h>
#include <assert.h>
#include <sys/ioctl.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <unistd.h>
#include <math.h>
#include <linux/input.h>
#include <dlfcn.h>
#include <getopt.h>
#include <signal.h>

#include "wayland-server.h"
#include "compositor.h"

/* The plan here is to generate a random anonymous socket name and
 * advertise that through a service on the session dbus.
 */
static const char *option_socket_name = NULL;
static const char *option_background = "background.png";
static int option_idle_time = 300;

static struct wl_list child_process_list;

static int
sigchld_handler(int signal_number, void *data)
{
      struct wlsc_process *p;
      int status;
      pid_t pid;

      pid = wait(&status);
      wl_list_for_each(p, &child_process_list, link) {
            if (p->pid == pid)
                  break;
      }

      if (&p->link == &child_process_list) {
            fprintf(stderr, "unknown child process exited\n");
            return 1;
      }

      wl_list_remove(&p->link);
      p->cleanup(p, status);

      return 1;
}

WL_EXPORT void
wlsc_watch_process(struct wlsc_process *process)
{
      wl_list_insert(&child_process_list, &process->link);
}

WL_EXPORT void
wlsc_matrix_init(struct wlsc_matrix *matrix)
{
      static const struct wlsc_matrix identity = {
            { 1, 0, 0, 0,  0, 1, 0, 0,  0, 0, 1, 0,  0, 0, 0, 1 }
      };

      memcpy(matrix, &identity, sizeof identity);
}

static void
wlsc_matrix_multiply(struct wlsc_matrix *m, const struct wlsc_matrix *n)
{
      struct wlsc_matrix tmp;
      const GLfloat *row, *column;
      div_t d;
      int i, j;

      for (i = 0; i < 16; i++) {
            tmp.d[i] = 0;
            d = div(i, 4);
            row = m->d + d.quot * 4;
            column = n->d + d.rem;
            for (j = 0; j < 4; j++)
                  tmp.d[i] += row[j] * column[j * 4];
      }
      memcpy(m, &tmp, sizeof tmp);
}

WL_EXPORT void
wlsc_matrix_translate(struct wlsc_matrix *matrix, GLfloat x, GLfloat y, GLfloat z)
{
      struct wlsc_matrix translate = {
            { 1, 0, 0, 0,  0, 1, 0, 0,  0, 0, 1, 0,  x, y, z, 1 }
      };

      wlsc_matrix_multiply(matrix, &translate);
}

WL_EXPORT void
wlsc_matrix_scale(struct wlsc_matrix *matrix, GLfloat x, GLfloat y, GLfloat z)
{
      struct wlsc_matrix scale = {
            { x, 0, 0, 0,  0, y, 0, 0,  0, 0, z, 0,  0, 0, 0, 1 }
      };

      wlsc_matrix_multiply(matrix, &scale);
}

static void
wlsc_matrix_transform(struct wlsc_matrix *matrix, struct wlsc_vector *v)
{
      int i, j;
      struct wlsc_vector t;

      for (i = 0; i < 4; i++) {
            t.f[i] = 0;
            for (j = 0; j < 4; j++)
                  t.f[i] += v->f[j] * matrix->d[i + j * 4];
      }

      *v = t;
}

WL_EXPORT void
wlsc_spring_init(struct wlsc_spring *spring,
             double k, double current, double target)
{
      spring->k = k;
      spring->friction = 100.0;
      spring->current = current;
      spring->previous = current;
      spring->target = target;
}

WL_EXPORT void
wlsc_spring_update(struct wlsc_spring *spring, uint32_t msec)
{
      double force, v, current, step;

      step = (msec - spring->timestamp) / 300.0;
      spring->timestamp = msec;

      current = spring->current;
      v = current - spring->previous;
      force = spring->k * (spring->target - current) / 10.0 +
            (spring->previous - current) - v * spring->friction;

      spring->current =
            current + (current - spring->previous) + force * step * step;
      spring->previous = current;

#if 0
      if (spring->current >= 1.0) {
#ifdef TWEENER_BOUNCE
            spring->current = 2.0 - spring->current;
            spring->previous = 2.0 - spring->previous;
#else
            spring->current = 1.0;
            spring->previous = 1.0;
#endif
      }

      if (spring->current <= 0.0) {
            spring->current = 0.0;
            spring->previous = 0.0;
      }
#endif
}

WL_EXPORT int
wlsc_spring_done(struct wlsc_spring *spring)
{
      return fabs(spring->previous - spring->target) < 0.0002 &&
            fabs(spring->current - spring->target) < 0.0002;
}

static void
surface_handle_buffer_destroy(struct wl_listener *listener,
                        struct wl_resource *resource, uint32_t time)
{
      struct wlsc_surface *es = container_of(listener, struct wlsc_surface,
                                     buffer_destroy_listener);
      struct wl_buffer *buffer = (struct wl_buffer *) resource;

      if (es->buffer == buffer)
            es->buffer = NULL;
}

static void
output_handle_scanout_buffer_destroy(struct wl_listener *listener,
                             struct wl_resource *resource,
                             uint32_t time)
{
      struct wlsc_output *output =
            container_of(listener, struct wlsc_output,
                       scanout_buffer_destroy_listener);
      struct wl_buffer *buffer = (struct wl_buffer *) resource;

      if (output->scanout_buffer == buffer)
            output->scanout_buffer = NULL;
}

WL_EXPORT struct wlsc_surface *
wlsc_surface_create(struct wlsc_compositor *compositor,
                int32_t x, int32_t y, int32_t width, int32_t height)
{
      struct wlsc_surface *surface;

      surface = malloc(sizeof *surface);
      if (surface == NULL)
            return NULL;

      wl_list_init(&surface->link);
      wl_list_init(&surface->buffer_link);
      surface->map_type = WLSC_SURFACE_MAP_UNMAPPED;

      glGenTextures(1, &surface->texture);
      glBindTexture(GL_TEXTURE_2D, surface->texture);
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

      surface->surface.client = NULL;

      surface->compositor = compositor;
      surface->visual = NULL;
      surface->image = EGL_NO_IMAGE_KHR;
      surface->saved_texture = 0;
      surface->x = x;
      surface->y = y;
      surface->width = width;
      surface->height = height;

      surface->buffer = NULL;

      pixman_region32_init(&surface->damage);
      pixman_region32_init(&surface->opaque);

      surface->buffer_destroy_listener.func = surface_handle_buffer_destroy;
      wl_list_init(&surface->buffer_destroy_listener.link);

      surface->transform = NULL;

      return surface;
}

WL_EXPORT void
wlsc_surface_damage_rectangle(struct wlsc_surface *surface,
                        int32_t x, int32_t y,
                        int32_t width, int32_t height)
{
      struct wlsc_compositor *compositor = surface->compositor;

      pixman_region32_union_rect(&surface->damage,
                           &surface->damage,
                           surface->x + x, surface->y + y,
                           width, height);
      wlsc_compositor_schedule_repaint(compositor);
}

WL_EXPORT void
wlsc_surface_damage(struct wlsc_surface *surface)
{
      wlsc_surface_damage_rectangle(surface, 0, 0,
                              surface->width, surface->height);
}

WL_EXPORT void
wlsc_surface_damage_below(struct wlsc_surface *surface)
{
      struct wlsc_surface *below;

      if (surface->link.next == &surface->compositor->surface_list)
            return;

      below = container_of(surface->link.next, struct wlsc_surface, link);

      pixman_region32_union_rect(&below->damage,
                           &below->damage,
                           surface->x, surface->y,
                           surface->width, surface->height);
      wlsc_compositor_schedule_repaint(surface->compositor);
}

WL_EXPORT void
wlsc_surface_configure(struct wlsc_surface *surface,
                   int x, int y, int width, int height)
{
      struct wlsc_compositor *compositor = surface->compositor;

      wlsc_surface_damage_below(surface);

      surface->x = x;
      surface->y = y;
      surface->width = width;
      surface->height = height;

      wlsc_surface_assign_output(surface);
      wlsc_surface_damage(surface);

      pixman_region32_fini(&surface->opaque);
      if (surface->visual == &compositor->compositor.rgb_visual)
            pixman_region32_init_rect(&surface->opaque,
                                surface->x, surface->y,
                                surface->width, surface->height);
      else
            pixman_region32_init(&surface->opaque);
}

WL_EXPORT uint32_t
wlsc_compositor_get_time(void)
{
      struct timeval tv;

      gettimeofday(&tv, NULL);

      return tv.tv_sec * 1000 + tv.tv_usec / 1000;
}

static void
destroy_surface(struct wl_resource *resource, struct wl_client *client)
{
      struct wlsc_surface *surface =
            container_of(resource, struct wlsc_surface, surface.resource);
      struct wlsc_compositor *compositor = surface->compositor;

      wlsc_surface_damage_below(surface);

      wl_list_remove(&surface->link);
      if (surface->saved_texture == 0)
            glDeleteTextures(1, &surface->texture);
      else
            glDeleteTextures(1, &surface->saved_texture);

      if (surface->buffer)
            wl_list_remove(&surface->buffer_destroy_listener.link);

      if (surface->image != EGL_NO_IMAGE_KHR)
            compositor->destroy_image(compositor->display,
                                surface->image);

      wl_list_remove(&surface->buffer_link);

      free(surface);
}

static void
wlsc_buffer_attach(struct wl_buffer *buffer, struct wl_surface *surface)
{
      struct wlsc_surface *es = (struct wlsc_surface *) surface;
      struct wlsc_compositor *ec = es->compositor;
      struct wl_list *surfaces_attached_to;

      if (es->saved_texture != 0)
            es->texture = es->saved_texture;

      glBindTexture(GL_TEXTURE_2D, es->texture);

      if (wl_buffer_is_shm(buffer)) {
            /* Unbind any EGLImage texture that may be bound, so we don't
             * overwrite it.*/
            glTexImage2D(GL_TEXTURE_2D, 0, GL_BGRA_EXT,
                       0, 0, 0, GL_BGRA_EXT, GL_UNSIGNED_BYTE, NULL);
            es->pitch = wl_shm_buffer_get_stride(buffer) / 4;
            glTexImage2D(GL_TEXTURE_2D, 0, GL_BGRA_EXT,
                       es->pitch, buffer->height, 0,
                       GL_BGRA_EXT, GL_UNSIGNED_BYTE,
                       wl_shm_buffer_get_data(buffer));
            es->visual = buffer->visual;

            surfaces_attached_to = buffer->user_data;

            wl_list_remove(&es->buffer_link);
            wl_list_insert(surfaces_attached_to, &es->buffer_link);
      } else {
            if (es->image != EGL_NO_IMAGE_KHR)
                  ec->destroy_image(ec->display, es->image);
            es->image = ec->create_image(ec->display, NULL,
                                   EGL_WAYLAND_BUFFER_WL,
                                   buffer, NULL);
            
            ec->image_target_texture_2d(GL_TEXTURE_2D, es->image);
            es->visual = buffer->visual;
            es->pitch = es->width;
      }
}

static void
wlsc_sprite_attach(struct wlsc_sprite *sprite, struct wl_surface *surface)
{
      struct wlsc_surface *es = (struct wlsc_surface *) surface;
      struct wlsc_compositor *ec = es->compositor;

      es->pitch = es->width;
      es->image = sprite->image;
      if (sprite->image != EGL_NO_IMAGE_KHR) {
            glBindTexture(GL_TEXTURE_2D, es->texture);
            ec->image_target_texture_2d(GL_TEXTURE_2D, es->image);
      } else {
            if (es->saved_texture == 0)
                  es->saved_texture = es->texture;
            es->texture = sprite->texture;
      }

      es->visual = sprite->visual;

      if (es->buffer)
            es->buffer = NULL;
}

enum sprite_usage {
      SPRITE_USE_CURSOR = (1 << 0),
};

static struct wlsc_sprite *
create_sprite_from_png(struct wlsc_compositor *ec,
                   const char *filename, uint32_t usage)
{
      uint32_t *pixels;
      struct wlsc_sprite *sprite;
      int32_t width, height;
      uint32_t stride;

      pixels = wlsc_load_image(filename, &width, &height, &stride);
      if (pixels == NULL)
            return NULL;

      sprite = malloc(sizeof *sprite);
      if (sprite == NULL) {
            free(pixels);
            return NULL;
      }

      sprite->visual = &ec->compositor.premultiplied_argb_visual;
      sprite->width = width;
      sprite->height = height;
      sprite->image = EGL_NO_IMAGE_KHR;

      if (usage & SPRITE_USE_CURSOR && ec->create_cursor_image != NULL)
            sprite->image = ec->create_cursor_image(ec, width, height);

      glGenTextures(1, &sprite->texture);
      glBindTexture(GL_TEXTURE_2D, sprite->texture);
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

      if (sprite->image != EGL_NO_IMAGE_KHR) {
            ec->image_target_texture_2d(GL_TEXTURE_2D, sprite->image);
            glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height,
                        GL_BGRA_EXT, GL_UNSIGNED_BYTE, pixels);
      } else {
            glTexImage2D(GL_TEXTURE_2D, 0, GL_BGRA_EXT, width, height, 0,
                       GL_BGRA_EXT, GL_UNSIGNED_BYTE, pixels);
      }

      free(pixels);

      return sprite;
}

static const struct {
      const char *filename;
      int hotspot_x, hotspot_y;
} pointer_images[] = {
      { DATADIR "/wayland/bottom_left_corner.png",     6, 30 },
      { DATADIR "/wayland/bottom_right_corner.png",   28, 28 },
      { DATADIR "/wayland/bottom_side.png",           16, 20 },
      { DATADIR "/wayland/grabbing.png",        20, 17 },
      { DATADIR "/wayland/left_ptr.png",        10,  5 },
      { DATADIR "/wayland/left_side.png",       10, 20 },
      { DATADIR "/wayland/right_side.png",            30, 19 },
      { DATADIR "/wayland/top_left_corner.png",  8,  8 },
      { DATADIR "/wayland/top_right_corner.png",      26,  8 },
      { DATADIR "/wayland/top_side.png",        18,  8 },
      { DATADIR "/wayland/xterm.png",                 15, 15 }
};

static void
create_pointer_images(struct wlsc_compositor *ec)
{
      int i, count;

      count = ARRAY_LENGTH(pointer_images);
      ec->pointer_sprites = malloc(count * sizeof *ec->pointer_sprites);
      for (i = 0; i < count; i++) {
            ec->pointer_sprites[i] =
                  create_sprite_from_png(ec,
                                     pointer_images[i].filename,
                                     SPRITE_USE_CURSOR);
      }
}

static struct wlsc_surface *
background_create(struct wlsc_output *output, const char *filename)
{
      struct wlsc_surface *background;
      struct wlsc_sprite *sprite;

      background = wlsc_surface_create(output->compositor,
                               output->x, output->y,
                               output->current->width,
                               output->current->height);
      if (background == NULL)
            return NULL;

      sprite = create_sprite_from_png(output->compositor, filename, 0);
      if (sprite == NULL) {
            free(background);
            return NULL;
      }

      wlsc_sprite_attach(sprite, &background->surface);

      return background;
}

static int
texture_region(struct wlsc_surface *es, pixman_region32_t *region)
{
      struct wlsc_compositor *ec = es->compositor;
      GLfloat *v, inv_width, inv_height;
      pixman_box32_t *rectangles;
      unsigned int *p;
      int i, n;

      rectangles = pixman_region32_rectangles(region, &n);
      v = wl_array_add(&ec->vertices, n * 16 * sizeof *v);
      p = wl_array_add(&ec->indices, n * 6 * sizeof *p);
      inv_width = 1.0 / es->pitch;
      inv_height = 1.0 / es->height;

      for (i = 0; i < n; i++, v += 16, p += 6) {
            v[ 0] = rectangles[i].x1;
            v[ 1] = rectangles[i].y1;
            v[ 2] = (GLfloat) (rectangles[i].x1 - es->x) * inv_width;
            v[ 3] = (GLfloat) (rectangles[i].y1 - es->y) * inv_height;

            v[ 4] = rectangles[i].x1;
            v[ 5] = rectangles[i].y2;
            v[ 6] = v[ 2];
            v[ 7] = (GLfloat) (rectangles[i].y2 - es->y) * inv_height;

            v[ 8] = rectangles[i].x2;
            v[ 9] = rectangles[i].y1;
            v[10] = (GLfloat) (rectangles[i].x2 - es->x) * inv_width;
            v[11] = v[ 3];

            v[12] = rectangles[i].x2;
            v[13] = rectangles[i].y2;
            v[14] = v[10];
            v[15] = v[ 7];

            p[0] = i * 4 + 0;
            p[1] = i * 4 + 1;
            p[2] = i * 4 + 2;
            p[3] = i * 4 + 2;
            p[4] = i * 4 + 1;
            p[5] = i * 4 + 3;
      }

      return n;
}

static void
transform_vertex(struct wlsc_surface *surface,
             GLfloat x, GLfloat y, GLfloat u, GLfloat v, GLfloat *r)
{
      struct wlsc_vector t;

      t.f[0] = x;
      t.f[1] = y;
      t.f[2] = 0.0;
      t.f[3] = 1.0;

      wlsc_matrix_transform(&surface->transform->matrix, &t);

      r[ 0] = t.f[0];
      r[ 1] = t.f[1];
      r[ 2] = u;
      r[ 3] = v;
}

static int
texture_transformed_surface(struct wlsc_surface *es)
{
      struct wlsc_compositor *ec = es->compositor;
      GLfloat *v;
      unsigned int *p;

      v = wl_array_add(&ec->vertices, 16 * sizeof *v);
      p = wl_array_add(&ec->indices, 6 * sizeof *p);

      transform_vertex(es, es->x, es->y, 0.0, 0.0, &v[0]);
      transform_vertex(es, es->x, es->y + es->height, 0.0, 1.0, &v[4]);
      transform_vertex(es, es->x + es->width, es->y, 1.0, 0.0, &v[8]);
      transform_vertex(es, es->x + es->width, es->y + es->height,
                   1.0, 1.0, &v[12]);

      p[0] = 0;
      p[1] = 1;
      p[2] = 2;
      p[3] = 2;
      p[4] = 1;
      p[5] = 3;

      return 1;
}

static void
wlsc_surface_draw(struct wlsc_surface *es,
              struct wlsc_output *output, pixman_region32_t *clip)
{
      struct wlsc_compositor *ec = es->compositor;
      GLfloat *v;
      pixman_region32_t repaint;
      GLint filter;
      int n;

      pixman_region32_init_rect(&repaint,
                          es->x, es->y, es->width, es->height);
      pixman_region32_intersect(&repaint, &repaint, clip);
      if (!pixman_region32_not_empty(&repaint))
            return;

      if (es->visual == &ec->compositor.argb_visual) {
            glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
            glEnable(GL_BLEND);
      } else if (es->visual == &ec->compositor.premultiplied_argb_visual) {
            glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
            glEnable(GL_BLEND);
      } else {
            glDisable(GL_BLEND);
      }

      if (es->transform == NULL) {
            filter = GL_NEAREST;
            n = texture_region(es, &repaint);
      } else {
            filter = GL_LINEAR;
            n = texture_transformed_surface(es);
      }

      glBindTexture(GL_TEXTURE_2D, es->texture);
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filter);
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filter);

      v = ec->vertices.data;
      glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4 * sizeof *v, &v[0]);
      glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 4 * sizeof *v, &v[2]);
      glEnableVertexAttribArray(0);
      glEnableVertexAttribArray(1);
      glDrawElements(GL_TRIANGLES, n * 6, GL_UNSIGNED_INT, ec->indices.data);

      ec->vertices.size = 0;
      ec->indices.size = 0;
      pixman_region32_fini(&repaint);
}

static void
wlsc_surface_raise(struct wlsc_surface *surface)
{
      struct wlsc_compositor *compositor = surface->compositor;

      wl_list_remove(&surface->link);
      wl_list_insert(&compositor->surface_list, &surface->link);
      wlsc_surface_damage(surface);
}

WL_EXPORT void
wlsc_compositor_damage_all(struct wlsc_compositor *compositor)
{
      struct wlsc_output *output;

      wl_list_for_each(output, &compositor->output_list, link)
            wlsc_output_damage(output);
}

static inline void
wlsc_buffer_post_release(struct wl_buffer *buffer)
{
      if (buffer == NULL || --buffer->busy_count > 0)
            return;

      assert(buffer->client != NULL);
      wl_client_post_event(buffer->client,
                       &buffer->resource.object,
                       WL_BUFFER_RELEASE);
}

WL_EXPORT void
wlsc_output_damage(struct wlsc_output *output)
{
      struct wlsc_compositor *compositor = output->compositor;

      pixman_region32_union(&compositor->damage,
                        &compositor->damage, &output->region);
      wlsc_compositor_schedule_repaint(compositor);
}

static void
fade_frame(struct wlsc_animation *animation,
         struct wlsc_output *output, uint32_t msecs)
{
      struct wlsc_compositor *compositor =
            container_of(animation,
                       struct wlsc_compositor, fade.animation);

      wlsc_spring_update(&compositor->fade.spring, msecs);
      if (wlsc_spring_done(&compositor->fade.spring)) {
            if (compositor->fade.spring.current > 0.999) {
                  compositor->state = WLSC_COMPOSITOR_SLEEPING;
                  compositor->shell->lock(compositor->shell);
            }
            compositor->fade.spring.current =
                  compositor->fade.spring.target;
            wl_list_remove(&animation->link);
            wl_list_init(&animation->link);
      }

      wlsc_output_damage(output);
}

static void
fade_output(struct wlsc_output *output,
          GLfloat tint, pixman_region32_t *region)
{
      struct wlsc_compositor *compositor = output->compositor;
      struct wlsc_surface surface;
      GLfloat color[4] = { 0.0, 0.0, 0.0, tint };

      surface.compositor = compositor;
      surface.x = output->x;
      surface.y = output->y;
      surface.width = output->current->width;
      surface.height = output->current->height;
      surface.texture = GL_NONE;
      surface.transform = NULL;

      if (tint <= 1.0)
            surface.visual =
                  &compositor->compositor.premultiplied_argb_visual;
      else
            surface.visual = &compositor->compositor.rgb_visual;

      glUseProgram(compositor->solid_shader.program);
      glUniformMatrix4fv(compositor->solid_shader.proj_uniform,
                     1, GL_FALSE, output->matrix.d);
      glUniform4fv(compositor->solid_shader.color_uniform, 1, color);
      wlsc_surface_draw(&surface, output, region);
}
 
static void
wlsc_output_repaint(struct wlsc_output *output)
{
      struct wlsc_compositor *ec = output->compositor;
      struct wlsc_surface *es;
      struct wlsc_input_device *device;
      pixman_region32_t clip, new_damage, total_damage;

      output->prepare_render(output);

      glViewport(0, 0, output->current->width, output->current->height);

      glUseProgram(ec->texture_shader.program);
      glUniformMatrix4fv(ec->texture_shader.proj_uniform,
                     1, GL_FALSE, output->matrix.d);
      glUniform1i(ec->texture_shader.tex_uniform, 0);

      pixman_region32_init(&new_damage);
      pixman_region32_intersect(&new_damage, &ec->damage, &output->region);
      pixman_region32_init(&clip);
      pixman_region32_copy(&clip, &output->region);
      wl_list_for_each(es, &ec->surface_list, link) {
            pixman_region32_intersect(&es->damage, &es->damage, &clip);
            pixman_region32_union(&new_damage, &new_damage, &es->damage);
            pixman_region32_subtract(&clip, &clip, &es->opaque);
      }

      pixman_region32_subtract(&ec->damage, &ec->damage, &output->region);
      pixman_region32_init(&total_damage);
      pixman_region32_union(&total_damage, &new_damage,
                        &output->previous_damage);
      pixman_region32_copy(&output->previous_damage, &new_damage);

      pixman_region32_fini(&clip);
      pixman_region32_fini(&new_damage);

      device = (struct wlsc_input_device *) ec->input_device;
      if (ec->focus && ec->fade.spring.current < 0.001) {
            if (!wl_list_empty(&device->sprite->link)) {
                  wl_list_remove(&device->sprite->link);
                  wl_list_init(&device->sprite->link);
            }
            if (output->set_hardware_cursor(output, device) < 0)
                  wl_list_insert(&ec->surface_list,
                               &device->sprite->link);
      } else {
            output->set_hardware_cursor(output, NULL);
            if (wl_list_empty(&device->sprite->link))
                  wl_list_insert(&ec->surface_list,
                               &device->sprite->link);
      }

      es = container_of(ec->surface_list.next, struct wlsc_surface, link);

      if (es->visual == &ec->compositor.rgb_visual &&
          output->prepare_scanout_surface(output, es) == 0) {
            /* We're drawing nothing now,
             * draw the damaged regions later. */
            pixman_region32_union(&ec->damage, &ec->damage, &total_damage);

            output->scanout_buffer = es->buffer;
            output->scanout_buffer->busy_count++;

            wl_list_remove(&output->scanout_buffer_destroy_listener.link);
            wl_list_insert(output->scanout_buffer->resource.destroy_listener_list.prev,
                         &output->scanout_buffer_destroy_listener.link);

            return;
      }

      if (es->fullscreen_output == output) {
            if (es->width < output->current->width ||
                es->height < output->current->height)
                  glClear(GL_COLOR_BUFFER_BIT);
            wlsc_surface_draw(es, output, &total_damage);
      } else {
            wl_list_for_each(es, &ec->surface_list, link) {
                  pixman_region32_copy(&es->damage, &total_damage);
                  pixman_region32_subtract(&total_damage, &total_damage, &es->opaque);
            }

            wl_list_for_each_reverse(es, &ec->surface_list, link) {
                  wlsc_surface_draw(es, output, &es->damage);
                  pixman_region32_fini(&es->damage);
                  pixman_region32_init(&es->damage);
            }
      }

      if (ec->fade.spring.current > 0.001)
            fade_output(output, ec->fade.spring.current, &total_damage);
}

static void
repaint(void *data, int msecs)
{
      struct wlsc_output *output = data;
      struct wlsc_compositor *compositor = output->compositor;
      struct wlsc_surface *es;
      struct wlsc_animation *animation, *next;

      wlsc_output_repaint(output);
      output->repaint_needed = 0;
      output->repaint_scheduled = 1;
      output->present(output);

      /* FIXME: Keep the surfaces in an per-output list. */
      wl_list_for_each(es, &compositor->surface_list, link) {
            if (es->output == output) {
                  wl_display_post_frame(compositor->wl_display,
                                    &es->surface, msecs);
            }
      }

      wl_list_for_each_safe(animation, next,
                        &compositor->animation_list, link)
            animation->frame(animation, output, msecs);
}

static void
idle_repaint(void *data)
{
      repaint(data, wlsc_compositor_get_time());
}

WL_EXPORT void
wlsc_output_finish_frame(struct wlsc_output *output, int msecs)
{
      wlsc_buffer_post_release(output->scanout_buffer);
      output->scanout_buffer = NULL;
      output->repaint_scheduled = 0;

      if (output->repaint_needed)
            repaint(output, msecs);
}

WL_EXPORT void
wlsc_compositor_schedule_repaint(struct wlsc_compositor *compositor)
{
      struct wlsc_output *output;
      struct wl_event_loop *loop;

      if (compositor->state == WLSC_COMPOSITOR_SLEEPING)
            return;

      loop = wl_display_get_event_loop(compositor->wl_display);
      wl_list_for_each(output, &compositor->output_list, link) {
            output->repaint_needed = 1;
            if (output->repaint_scheduled)
                  continue;

            wl_event_loop_add_idle(loop, idle_repaint, output);
            output->repaint_scheduled = 1;
      }
}

WL_EXPORT void
wlsc_compositor_fade(struct wlsc_compositor *compositor, float tint)
{
      int done;

      done = wlsc_spring_done(&compositor->fade.spring);
      compositor->fade.spring.target = tint;
      if (wlsc_spring_done(&compositor->fade.spring))
            return;

      if (done)
            compositor->fade.spring.timestamp =
                  wlsc_compositor_get_time();

      wlsc_compositor_damage_all(compositor);
      if (wl_list_empty(&compositor->fade.animation.link))
            wl_list_insert(compositor->animation_list.prev,
                         &compositor->fade.animation.link);
}

static void
surface_destroy(struct wl_client *client,
            struct wl_surface *surface)
{
      wl_resource_destroy(&surface->resource, client,
                      wlsc_compositor_get_time());
}

WL_EXPORT void
wlsc_surface_assign_output(struct wlsc_surface *es)
{
      struct wlsc_compositor *ec = es->compositor;
      struct wlsc_output *output;

      struct wlsc_output *tmp = es->output;
      es->output = NULL;

      wl_list_for_each(output, &ec->output_list, link) {
            if (pixman_region32_contains_point(&output->region,
                                       es->x, es->y, NULL)) {
                  if (output != tmp)
                        printf("assiging surface %p to output %p\n",
                               es, output);
                  es->output = output;
            }
      }
      
      if (es->output == NULL) {
            printf("no output found\n");
            es->output = container_of(ec->output_list.next,
                                struct wlsc_output, link);
      }
}

static void
surface_attach(struct wl_client *client,
             struct wl_surface *surface, struct wl_buffer *buffer,
             int32_t x, int32_t y)
{
      struct wlsc_surface *es = (struct wlsc_surface *) surface;

      buffer->busy_count++;
      wlsc_buffer_post_release(es->buffer);

      es->buffer = buffer;
      wl_list_remove(&es->buffer_destroy_listener.link);
      wl_list_insert(es->buffer->resource.destroy_listener_list.prev,
                   &es->buffer_destroy_listener.link);

      if (es->visual == NULL)
            wl_list_insert(&es->compositor->surface_list, &es->link);

      wlsc_surface_configure(es, es->x + x, es->y + y,
                         buffer->width, buffer->height);

      wlsc_buffer_attach(buffer, surface);

      es->compositor->shell->attach(es->compositor->shell, es);
}

static void
surface_damage(struct wl_client *client,
             struct wl_surface *surface,
             int32_t x, int32_t y, int32_t width, int32_t height)
{
      struct wlsc_surface *es = (struct wlsc_surface *) surface;

      wlsc_surface_damage_rectangle(es, x, y, width, height);
}

const static struct wl_surface_interface surface_interface = {
      surface_destroy,
      surface_attach,
      surface_damage
};

static void
wlsc_input_device_attach(struct wlsc_input_device *device,
                   int x, int y, int width, int height)
{
      wlsc_surface_damage_below(device->sprite);

      device->hotspot_x = x;
      device->hotspot_y = y;

      device->sprite->x = device->input_device.x - device->hotspot_x;
      device->sprite->y = device->input_device.y - device->hotspot_y;
      device->sprite->width = width;
      device->sprite->height = height;

      wlsc_surface_damage(device->sprite);
}

static void
wlsc_input_device_attach_buffer(struct wlsc_input_device *device,
                        struct wl_buffer *buffer, int x, int y)
{
      wlsc_buffer_attach(buffer, &device->sprite->surface);
      wlsc_input_device_attach(device, x, y, buffer->width, buffer->height);
}

static void
wlsc_input_device_attach_sprite(struct wlsc_input_device *device,
                        struct wlsc_sprite *sprite, int x, int y)
{
      wlsc_sprite_attach(sprite, &device->sprite->surface);
      wlsc_input_device_attach(device, x, y, sprite->width, sprite->height);
}

WL_EXPORT void
wlsc_input_device_set_pointer_image(struct wlsc_input_device *device,
                            enum wlsc_pointer_type type)
{
      struct wlsc_compositor *compositor =
            (struct wlsc_compositor *) device->input_device.compositor;

      wlsc_input_device_attach_sprite(device,
                              compositor->pointer_sprites[type],
                              pointer_images[type].hotspot_x,
                              pointer_images[type].hotspot_y);
}

static void
compositor_create_surface(struct wl_client *client,
                    struct wl_compositor *compositor, uint32_t id)
{
      struct wlsc_compositor *ec = (struct wlsc_compositor *) compositor;
      struct wlsc_surface *surface;

      surface = wlsc_surface_create(ec, 0, 0, 0, 0);
      if (surface == NULL) {
            wl_client_post_no_memory(client);
            return;
      }

      surface->surface.resource.destroy = destroy_surface;

      surface->surface.resource.object.id = id;
      surface->surface.resource.object.interface = &wl_surface_interface;
      surface->surface.resource.object.implementation =
            (void (**)(void)) &surface_interface;
      surface->surface.client = client;

      wl_client_add_resource(client, &surface->surface.resource);
}

const static struct wl_compositor_interface compositor_interface = {
      compositor_create_surface,
};

static void
wlsc_surface_transform(struct wlsc_surface *surface,
                   int32_t x, int32_t y, int32_t *sx, int32_t *sy)
{
      *sx = x - surface->x;
      *sy = y - surface->y;
}

WL_EXPORT struct wlsc_surface *
pick_surface(struct wl_input_device *device, int32_t *sx, int32_t *sy)
{
      struct wlsc_compositor *ec =
            (struct wlsc_compositor *) device->compositor;
      struct wlsc_surface *es;

      wl_list_for_each(es, &ec->surface_list, link) {
            if (es->surface.client == NULL)
                  continue;
            wlsc_surface_transform(es, device->x, device->y, sx, sy);
            if (0 <= *sx && *sx < es->width &&
                0 <= *sy && *sy < es->height)
                  return es;
      }

      return NULL;
}


static void
motion_grab_motion(struct wl_grab *grab,
               uint32_t time, int32_t x, int32_t y)
{
      struct wlsc_input_device *device =
            (struct wlsc_input_device *) grab->input_device;
      struct wlsc_surface *es =
            (struct wlsc_surface *) device->input_device.pointer_focus;
      int32_t sx, sy;

      wlsc_surface_transform(es, x, y, &sx, &sy);
      wl_client_post_event(es->surface.client,
                       &device->input_device.object,
                       WL_INPUT_DEVICE_MOTION,
                       time, x, y, sx, sy);
}

static void
motion_grab_button(struct wl_grab *grab,
               uint32_t time, int32_t button, int32_t state)
{
      wl_client_post_event(grab->input_device->pointer_focus->client,
                       &grab->input_device->object,
                       WL_INPUT_DEVICE_BUTTON,
                       time, button, state);
}

static void
motion_grab_end(struct wl_grab *grab, uint32_t time)
{
}

static const struct wl_grab_interface motion_grab_interface = {
      motion_grab_motion,
      motion_grab_button,
      motion_grab_end
};

WL_EXPORT void
wlsc_compositor_wake(struct wlsc_compositor *compositor)
{
      if (compositor->idle_inhibit)
            return;

      wlsc_compositor_fade(compositor, 0.0);
      compositor->state = WLSC_COMPOSITOR_ACTIVE;

      wl_event_source_timer_update(compositor->idle_source,
                             option_idle_time * 1000);
}

static void
wlsc_compositor_idle_inhibit(struct wlsc_compositor *compositor)
{
      wlsc_compositor_wake(compositor);
      compositor->idle_inhibit++;
}

static void
wlsc_compositor_idle_release(struct wlsc_compositor *compositor)
{
      compositor->idle_inhibit--;
      wlsc_compositor_wake(compositor);
}

static int
idle_handler(void *data)
{
      struct wlsc_compositor *compositor = data;

      if (compositor->idle_inhibit)
            return 1;

      wlsc_compositor_fade(compositor, 1.0);

      return 1;
}

WL_EXPORT void
notify_motion(struct wl_input_device *device, uint32_t time, int x, int y)
{
      struct wlsc_surface *es;
      struct wlsc_compositor *ec =
            (struct wlsc_compositor *) device->compositor;
      struct wlsc_output *output;
      const struct wl_grab_interface *interface;
      struct wlsc_input_device *wd = (struct wlsc_input_device *) device;
      int32_t sx, sy;
      int x_valid = 0, y_valid = 0;
      int min_x = INT_MAX, min_y = INT_MAX, max_x = INT_MIN, max_y = INT_MIN;

      wlsc_compositor_wake(ec);

      wl_list_for_each(output, &ec->output_list, link) {
            if (output->x <= x && x <= output->x + output->current->width)
                  x_valid = 1;

            if (output->y <= y && y <= output->y + output->current->height)
                  y_valid = 1;

            /* FIXME: calculate this only on output addition/deletion */
            if (output->x < min_x)
                  min_x = output->x;
            if (output->y < min_y)
                  min_y = output->y;

            if (output->x + output->current->width > max_x)
                  max_x = output->x + output->current->width;
            if (output->y + output->current->height > max_y)
                  max_y = output->y + output->current->height;
      }
      
      if (!x_valid) {
            if (x < min_x)
                  x = min_x;
            else if (x >= max_x)
                  x = max_x;
      }
      if (!y_valid) {
            if (y < min_y)
                  y = min_y;
            else  if (y >= max_y)
                  y = max_y;
      }

      device->x = x;
      device->y = y;

      if (device->grab) {
            interface = device->grab->interface;
            interface->motion(device->grab, time, x, y);
      } else {
            es = pick_surface(device, &sx, &sy);
            wl_input_device_set_pointer_focus(device,
                                      &es->surface,
                                      time, x, y, sx, sy);
            if (es)
                  wl_client_post_event(es->surface.client,
                                   &device->object,
                                   WL_INPUT_DEVICE_MOTION,
                                   time, x, y, sx, sy);
      }

      wlsc_surface_damage_below(wd->sprite);

      wd->sprite->x = device->x - wd->hotspot_x;
      wd->sprite->y = device->y - wd->hotspot_y;

      wlsc_surface_damage(wd->sprite);
}

WL_EXPORT void
wlsc_surface_activate(struct wlsc_surface *surface,
                  struct wlsc_input_device *device, uint32_t time)
{
      struct wlsc_shell *shell = surface->compositor->shell;

      wlsc_surface_raise(surface);
      if (device->selection)
            shell->set_selection_focus(shell,
                                 device->selection,
                                 &surface->surface, time);

      wl_input_device_set_keyboard_focus(&device->input_device,
                                 &surface->surface,
                                 time);
}

01296 struct wlsc_binding {
      uint32_t key;
      uint32_t button;
      uint32_t modifier;
      wlsc_binding_handler_t handler;
      void *data;
      struct wl_list link;
};

WL_EXPORT void
notify_button(struct wl_input_device *device,
            uint32_t time, int32_t button, int32_t state)
{
      struct wlsc_input_device *wd = (struct wlsc_input_device *) device;
      struct wlsc_compositor *compositor =
            (struct wlsc_compositor *) device->compositor;
      struct wlsc_binding *b;
      struct wlsc_surface *surface =
            (struct wlsc_surface *) device->pointer_focus;

      if (state)
            wlsc_compositor_idle_inhibit(compositor);
      else
            wlsc_compositor_idle_release(compositor);

      if (state && surface && device->grab == NULL) {
            wlsc_surface_activate(surface, wd, time);
            wl_input_device_start_grab(device,
                                 &device->motion_grab,
                                 button, time);
      }

      wl_list_for_each(b, &compositor->binding_list, link) {
            if (b->button == button &&
                b->modifier == wd->modifier_state && state) {
                  b->handler(&wd->input_device,
                           time, 0, button, state, b->data);
                  break;
            }
      }

      if (device->grab)
            device->grab->interface->button(device->grab, time,
                                    button, state);

      if (!state && device->grab && device->grab_button == button)
            wl_input_device_end_grab(device, time);
}

static void
terminate_binding(struct wl_input_device *device, uint32_t time,
              uint32_t key, uint32_t button, uint32_t state, void *data)
{
      struct wlsc_compositor *compositor = data;

      if (state)
            wl_display_terminate(compositor->wl_display);
}

WL_EXPORT struct wlsc_binding *
wlsc_compositor_add_binding(struct wlsc_compositor *compositor,
                      uint32_t key, uint32_t button, uint32_t modifier,
                      wlsc_binding_handler_t handler, void *data)
{
      struct wlsc_binding *binding;

      binding = malloc(sizeof *binding);
      if (binding == NULL)
            return NULL;

      binding->key = key;
      binding->button = button;
      binding->modifier = modifier;
      binding->handler = handler;
      binding->data = data;
      wl_list_insert(compositor->binding_list.prev, &binding->link);

      return binding;
}

WL_EXPORT void
wlsc_binding_destroy(struct wlsc_binding *binding)
{
      wl_list_remove(&binding->link);
      free(binding);
}

static void
update_modifier_state(struct wlsc_input_device *device,
                  uint32_t key, uint32_t state)
{
      uint32_t modifier;

      switch (key) {
      case KEY_LEFTCTRL:
      case KEY_RIGHTCTRL:
            modifier = MODIFIER_CTRL;
            break;

      case KEY_LEFTALT:
      case KEY_RIGHTALT:
            modifier = MODIFIER_ALT;
            break;

      case KEY_LEFTMETA:
      case KEY_RIGHTMETA:
            modifier = MODIFIER_SUPER;
            break;

      default:
            modifier = 0;
            break;
      }

      if (state)
            device->modifier_state |= modifier;
      else
            device->modifier_state &= ~modifier;
}

WL_EXPORT void
notify_key(struct wl_input_device *device,
         uint32_t time, uint32_t key, uint32_t state)
{
      struct wlsc_input_device *wd = (struct wlsc_input_device *) device;
      struct wlsc_compositor *compositor =
            (struct wlsc_compositor *) device->compositor;
      uint32_t *k, *end;
      struct wlsc_binding *b;

      if (state)
            wlsc_compositor_idle_inhibit(compositor);
      else
            wlsc_compositor_idle_release(compositor);

      wl_list_for_each(b, &compositor->binding_list, link) {
            if (b->key == key &&
                b->modifier == wd->modifier_state) {
                  b->handler(&wd->input_device,
                           time, key, 0, state, b->data);
                  break;
            }
      }

      update_modifier_state(wd, key, state);
      end = device->keys.data + device->keys.size;
      for (k = device->keys.data; k < end; k++) {
            if (*k == key)
                  *k = *--end;
      }
      device->keys.size = (void *) end - device->keys.data;
      if (state) {
            k = wl_array_add(&device->keys, sizeof *k);
            *k = key;
      }

      if (device->keyboard_focus != NULL)
            wl_client_post_event(device->keyboard_focus->client,
                             &device->object,
                             WL_INPUT_DEVICE_KEY, time, key, state);
}

WL_EXPORT void
notify_pointer_focus(struct wl_input_device *device,
                 uint32_t time, struct wlsc_output *output,
                 int32_t x, int32_t y)
{
      struct wlsc_input_device *wd = (struct wlsc_input_device *) device;
      struct wlsc_compositor *compositor =
            (struct wlsc_compositor *) device->compositor;
      struct wlsc_surface *es;
      int32_t sx, sy;

      if (output) {
            device->x = x;
            device->y = y;
            es = pick_surface(device, &sx, &sy);
            wl_input_device_set_pointer_focus(device,
                                      &es->surface,
                                      time, x, y, sx, sy);

            compositor->focus = 1;

            wd->sprite->x = device->x - wd->hotspot_x;
            wd->sprite->y = device->y - wd->hotspot_y;
      } else {
            wl_input_device_set_pointer_focus(device, NULL,
                                      time, 0, 0, 0, 0);
            compositor->focus = 0;
      }

      wlsc_surface_damage(wd->sprite);
}

WL_EXPORT void
notify_keyboard_focus(struct wl_input_device *device,
                  uint32_t time, struct wlsc_output *output,
                  struct wl_array *keys)
{
      struct wlsc_input_device *wd =
            (struct wlsc_input_device *) device;
      struct wlsc_compositor *compositor =
            (struct wlsc_compositor *) device->compositor;
      struct wlsc_surface *es;
      uint32_t *k, *end;

      if (!wl_list_empty(&compositor->surface_list))
            es = container_of(compositor->surface_list.next,
                          struct wlsc_surface, link);
      else
            es = NULL;

      if (output) {
            wl_array_copy(&wd->input_device.keys, keys);
            wd->modifier_state = 0;
            end = device->keys.data + device->keys.size;
            for (k = device->keys.data; k < end; k++) {
                  wlsc_compositor_idle_inhibit(compositor);
                  update_modifier_state(wd, *k, 1);
            }

            if (es->surface.client)
                  wl_input_device_set_keyboard_focus(&wd->input_device,
                                             &es->surface, time);
      } else {
            end = device->keys.data + device->keys.size;
            for (k = device->keys.data; k < end; k++)
                  wlsc_compositor_idle_release(compositor);

            wd->modifier_state = 0;
            wl_input_device_set_keyboard_focus(&wd->input_device,
                                       NULL, time);
      }
}


static void
input_device_attach(struct wl_client *client,
                struct wl_input_device *device_base,
                uint32_t time,
                struct wl_buffer *buffer, int32_t x, int32_t y)
{
      struct wlsc_input_device *device =
            (struct wlsc_input_device *) device_base;

      if (time < device->input_device.pointer_focus_time)
            return;
      if (device->input_device.pointer_focus == NULL)
            return;
      if (device->input_device.pointer_focus->client != client)
            return;

      if (buffer == NULL) {
            wlsc_input_device_set_pointer_image(device,
                                        WLSC_POINTER_LEFT_PTR);
            return;
      }

      wlsc_input_device_attach_buffer(device, buffer, x, y);
}

const static struct wl_input_device_interface input_device_interface = {
      input_device_attach,
};

WL_EXPORT void
wlsc_input_device_init(struct wlsc_input_device *device,
                   struct wlsc_compositor *ec)
{
      wl_input_device_init(&device->input_device, &ec->compositor);

      device->input_device.object.interface = &wl_input_device_interface;
      device->input_device.object.implementation =
            (void (**)(void)) &input_device_interface;
      wl_display_add_object(ec->wl_display, &device->input_device.object);
      wl_display_add_global(ec->wl_display, &device->input_device.object, NULL);

      device->sprite = wlsc_surface_create(ec,
                                   device->input_device.x,
                                   device->input_device.y, 32, 32);
      wl_list_insert(&ec->surface_list, &device->sprite->link);

      device->hotspot_x = 16;
      device->hotspot_y = 16;
      device->modifier_state = 0;

      device->input_device.motion_grab.interface = &motion_grab_interface;

      wl_list_insert(ec->input_device_list.prev, &device->link);

      wlsc_input_device_set_pointer_image(device, WLSC_POINTER_LEFT_PTR);
}

static void
wlsc_output_post_geometry(struct wl_client *client,
                    struct wl_object *global, uint32_t version)
{
      struct wlsc_output *output =
            container_of(global, struct wlsc_output, object);
      struct wlsc_mode *mode;

      wl_client_post_event(client, global,
                       WL_OUTPUT_GEOMETRY,
                       output->x,
                       output->y,
                       output->mm_width,
                       output->mm_height,
                       output->subpixel,
                       output->make, output->model);

      wl_list_for_each (mode, &output->mode_list, link) {
            wl_client_post_event(client, global,
                             WL_OUTPUT_MODE,
                             mode->flags,
                             mode->width, mode->height, mode->refresh);
      }
}

static const char vertex_shader[] =
      "uniform mat4 proj;\n"
      "attribute vec2 position;\n"
      "attribute vec2 texcoord;\n"
      "varying vec2 v_texcoord;\n"
      "void main()\n"
      "{\n"
      "   gl_Position = proj * vec4(position, 0.0, 1.0);\n"
      "   v_texcoord = texcoord;\n"
      "}\n";

static const char texture_fragment_shader[] =
      "precision mediump float;\n"
      "varying vec2 v_texcoord;\n"
      "uniform sampler2D tex;\n"
      "void main()\n"
      "{\n"
      "   gl_FragColor = texture2D(tex, v_texcoord)\n;"
      "}\n";

static const char solid_fragment_shader[] =
      "precision mediump float;\n"
      "uniform vec4 color;\n"
      "void main()\n"
      "{\n"
      "   gl_FragColor = color\n;"
      "}\n";

static int
compile_shader(GLenum type, const char *source)
{
      GLuint s;
      char msg[512];
      GLint status;

      s = glCreateShader(type);
      glShaderSource(s, 1, &source, NULL);
      glCompileShader(s);
      glGetShaderiv(s, GL_COMPILE_STATUS, &status);
      if (!status) {
            glGetShaderInfoLog(s, sizeof msg, NULL, msg);
            fprintf(stderr, "shader info: %s\n", msg);
            return GL_NONE;
      }

      return s;
}

static int
wlsc_shader_init(struct wlsc_shader *shader,
             const char *vertex_source, const char *fragment_source)
{
      char msg[512];
      GLint status;

      shader->vertex_shader =
            compile_shader(GL_VERTEX_SHADER, vertex_source);
      shader->fragment_shader =
            compile_shader(GL_FRAGMENT_SHADER, fragment_source);

      shader->program = glCreateProgram();
      glAttachShader(shader->program, shader->vertex_shader);
      glAttachShader(shader->program, shader->fragment_shader);
      glBindAttribLocation(shader->program, 0, "position");
      glBindAttribLocation(shader->program, 1, "texcoord");

      glLinkProgram(shader->program);
      glGetProgramiv(shader->program, GL_LINK_STATUS, &status);
      if (!status) {
            glGetProgramInfoLog(shader->program, sizeof msg, NULL, msg);
            fprintf(stderr, "link info: %s\n", msg);
            return -1;
      }

      shader->proj_uniform = glGetUniformLocation(shader->program, "proj");
      shader->tex_uniform = glGetUniformLocation(shader->program, "tex");

      return 0;
}

static int
init_solid_shader(struct wlsc_shader *shader,
              GLuint vertex_shader, const char *fragment_source)
{
      GLint status;
      char msg[512];

      shader->vertex_shader = vertex_shader;
      shader->fragment_shader =
            compile_shader(GL_FRAGMENT_SHADER, fragment_source);

      shader->program = glCreateProgram();
      glAttachShader(shader->program, shader->vertex_shader);
      glAttachShader(shader->program, shader->fragment_shader);
      glBindAttribLocation(shader->program, 0, "position");
      glBindAttribLocation(shader->program, 1, "texcoord");

      glLinkProgram(shader->program);
      glGetProgramiv(shader->program, GL_LINK_STATUS, &status);
      if (!status) {
            glGetProgramInfoLog(shader->program, sizeof msg, NULL, msg);
            fprintf(stderr, "link info: %s\n", msg);
            return -1;
      }
 
      shader->proj_uniform = glGetUniformLocation(shader->program, "proj");
      shader->color_uniform = glGetUniformLocation(shader->program, "color");

      return 0;
}

WL_EXPORT void
wlsc_output_destroy(struct wlsc_output *output)
{
      pixman_region32_fini(&output->region);
      pixman_region32_fini(&output->previous_damage);
      destroy_surface(&output->background->surface.resource, NULL);
}

WL_EXPORT void
wlsc_output_move(struct wlsc_output *output, int x, int y)
{
      struct wlsc_compositor *c = output->compositor;
      int flip;

      output->x = x;
      output->y = y;

      if (output->background) {
            output->background->x = x;
            output->background->y = y;
      }

      pixman_region32_init(&output->previous_damage);
      pixman_region32_init_rect(&output->region, x, y, 
                          output->current->width,
                          output->current->height);

      wlsc_matrix_init(&output->matrix);
      wlsc_matrix_translate(&output->matrix,
                        -output->x - output->current->width / 2.0,
                        -output->y - output->current->height / 2.0, 0);

      flip = (output->flags & WL_OUTPUT_FLIPPED) ? -1 : 1;
      wlsc_matrix_scale(&output->matrix,
                    2.0 / output->current->width,
                    flip * 2.0 / output->current->height, 1);

      pixman_region32_union(&c->damage, &c->damage, &output->region);
}

WL_EXPORT void
wlsc_output_init(struct wlsc_output *output, struct wlsc_compositor *c,
             int x, int y, int width, int height, uint32_t flags)
{
      output->compositor = c;
      output->x = x;
      output->y = y;
      output->mm_width = width;
      output->mm_height = height;

      output->background =
            background_create(output, option_background);
 
      if (output->background != NULL)
            wl_list_insert(c->surface_list.prev,
                         &output->background->link);

      output->flags = flags;
      wlsc_output_move(output, x, y);

      output->scanout_buffer_destroy_listener.func =
            output_handle_scanout_buffer_destroy;
      wl_list_init(&output->scanout_buffer_destroy_listener.link);

      output->object.interface = &wl_output_interface;
      wl_display_add_object(c->wl_display, &output->object);
      wl_display_add_global(c->wl_display, &output->object,
                        wlsc_output_post_geometry);
}

static void
shm_buffer_created(struct wl_buffer *buffer)
{
      struct wl_list *surfaces_attached_to;

      surfaces_attached_to = malloc(sizeof *surfaces_attached_to);
      if (!surfaces_attached_to) {
            buffer->user_data = NULL;
            return;
      }

      wl_list_init(surfaces_attached_to);

      buffer->user_data = surfaces_attached_to;
}

static void
shm_buffer_damaged(struct wl_buffer *buffer,
               int32_t x, int32_t y, int32_t width, int32_t height)
{
      struct wl_list *surfaces_attached_to = buffer->user_data;
      struct wlsc_surface *es;
      GLsizei tex_width = wl_shm_buffer_get_stride(buffer) / 4;

      wl_list_for_each(es, surfaces_attached_to, buffer_link) {
            glBindTexture(GL_TEXTURE_2D, es->texture);
            glTexImage2D(GL_TEXTURE_2D, 0, GL_BGRA_EXT,
                       tex_width, buffer->height, 0,
                       GL_BGRA_EXT, GL_UNSIGNED_BYTE,
                       wl_shm_buffer_get_data(buffer));
            /* Hmm, should use glTexSubImage2D() here but GLES2 doesn't
             * support any unpack attributes except GL_UNPACK_ALIGNMENT. */
      }
}

static void
shm_buffer_destroyed(struct wl_buffer *buffer)
{
      struct wl_list *surfaces_attached_to = buffer->user_data;
      struct wlsc_surface *es, *next;

      wl_list_for_each_safe(es, next, surfaces_attached_to, buffer_link) {
            wl_list_remove(&es->buffer_link);
            wl_list_init(&es->buffer_link);
      }

      free(surfaces_attached_to);
}

const static struct wl_shm_callbacks shm_callbacks = {
      shm_buffer_created,
      shm_buffer_damaged,
      shm_buffer_destroyed
};

WL_EXPORT int
wlsc_compositor_init(struct wlsc_compositor *ec, struct wl_display *display)
{
      struct wl_event_loop *loop;
      const char *extensions;

      ec->wl_display = display;

      wl_compositor_init(&ec->compositor, &compositor_interface, display);

      ec->shm = wl_shm_init(display, &shm_callbacks);

      ec->image_target_texture_2d =
            (void *) eglGetProcAddress("glEGLImageTargetTexture2DOES");
      ec->image_target_renderbuffer_storage = (void *)
            eglGetProcAddress("glEGLImageTargetRenderbufferStorageOES");
      ec->create_image = (void *) eglGetProcAddress("eglCreateImageKHR");
      ec->destroy_image = (void *) eglGetProcAddress("eglDestroyImageKHR");
      ec->bind_display =
            (void *) eglGetProcAddress("eglBindWaylandDisplayWL");
      ec->unbind_display =
            (void *) eglGetProcAddress("eglUnbindWaylandDisplayWL");

      extensions = (const char *) glGetString(GL_EXTENSIONS);
      if (!strstr(extensions, "GL_EXT_texture_format_BGRA8888")) {
            fprintf(stderr,
                  "GL_EXT_texture_format_BGRA8888 not available\n");
            return -1;
      }

      extensions =
            (const char *) eglQueryString(ec->display, EGL_EXTENSIONS);
      if (strstr(extensions, "EGL_WL_bind_wayland_display"))
            ec->has_bind_display = 1;
      if (ec->has_bind_display)
            ec->bind_display(ec->display, ec->wl_display);

      wl_list_init(&ec->surface_list);
      wl_list_init(&ec->input_device_list);
      wl_list_init(&ec->output_list);
      wl_list_init(&ec->binding_list);
      wl_list_init(&ec->animation_list);
      wlsc_spring_init(&ec->fade.spring, 0.8, 0.0, 0.0);
      ec->fade.animation.frame = fade_frame;
      wl_list_init(&ec->fade.animation.link);

      wlsc_compositor_add_binding(ec, KEY_BACKSPACE, 0,
                            MODIFIER_CTRL | MODIFIER_ALT,
                            terminate_binding, ec);

      create_pointer_images(ec);

      screenshooter_create(ec);

      glActiveTexture(GL_TEXTURE0);

      if (wlsc_shader_init(&ec->texture_shader,
                       vertex_shader, texture_fragment_shader) < 0)
            return -1;
      if (init_solid_shader(&ec->solid_shader,
                        ec->texture_shader.vertex_shader,
                        solid_fragment_shader) < 0)
            return -1;

      loop = wl_display_get_event_loop(ec->wl_display);
      ec->idle_source = wl_event_loop_add_timer(loop, idle_handler, ec);
      wl_event_source_timer_update(ec->idle_source, option_idle_time * 1000);

      pixman_region32_init(&ec->damage);
      wlsc_compositor_schedule_repaint(ec);

      return 0;
}

static int on_term_signal(int signal_number, void *data)
{
      struct wlsc_compositor *ec = data;

      wl_display_terminate(ec->wl_display);

      return 1;
}

static void *
load_module(const char *name, const char *entrypoint, void **handle)
{
      char path[PATH_MAX];
      void *module, *init;

      if (name[0] != '/')
            snprintf(path, sizeof path, MODULEDIR "/%s", name);
      else
            snprintf(path, sizeof path, "%s", name);

      module = dlopen(path, RTLD_LAZY);
      if (!module) {
            fprintf(stderr,
                  "failed to load module: %s\n", dlerror());
            return NULL;
      }

      init = dlsym(module, entrypoint);
      if (!init) {
            fprintf(stderr,
                  "failed to lookup init function: %s\n", dlerror());
            return NULL;
      }

      return init;
}

int main(int argc, char *argv[])
{
      struct wl_display *display;
      struct wlsc_compositor *ec;
      struct wl_event_loop *loop;
      int o, xserver = 0;
      void *shell_module, *backend_module;
      int (*shell_init)(struct wlsc_compositor *ec);
      struct wlsc_compositor
            *(*backend_init)(struct wl_display *display, char *options);
      char *backend = NULL;
      char *backend_options = "";
      char *shell = NULL;
      char *p;

      static const char opts[] = "B:b:o:S:i:s:x";
      static const struct option longopts[ ] = {
            { "backend", 1, NULL, 'B' },
            { "backend-options", 1, NULL, 'o' },
            { "background", 1, NULL, 'b' },
            { "socket", 1, NULL, 'S' },
            { "idle-time", 1, NULL, 'i' },
            { "shell", 1, NULL, 's' },
            { "xserver", 0, NULL, 'x' },
            { NULL, }
      };

      while (o = getopt_long(argc, argv, opts, longopts, &o), o > 0) {
            switch (o) {
            case 'b':
                  option_background = optarg;
                  break;
            case 'B':
                  backend = optarg;
                  break;
            case 'o':
                  backend_options = optarg;
                  break;
            case 'S':
                  option_socket_name = optarg;
                  break;
            case 'i':
                  option_idle_time = strtol(optarg, &p, 0);
                  if (*p != '\0') {
                        fprintf(stderr,
                              "invalid idle time option: %s\n",
                              optarg);
                        exit(EXIT_FAILURE);
                  }
                  break;
            case 's':
                  shell = optarg;
                  break;
            case 'x':
                  xserver = 1;
                  break;
            }
      }

      display = wl_display_create();

      ec = NULL;

      if (!backend) {
            if (getenv("WAYLAND_DISPLAY"))
                  backend = "wayland-backend.so";
            else if (getenv("DISPLAY"))
                  backend = "x11-backend.so";
            else if (getenv("OPENWFD"))
                  backend = "openwfd-backend.so";
            else
                  backend = "drm-backend.so";
      }

      if (!shell)
            shell = "desktop-shell.so";

      backend_init = load_module(backend, "backend_init", &backend_module);
      if (!backend_init)
            exit(EXIT_FAILURE);

      shell_init = load_module(shell, "shell_init", &shell_module);
      if (!shell_init)
            exit(EXIT_FAILURE);

      ec = backend_init(display, backend_options);
      if (ec == NULL) {
            fprintf(stderr, "failed to create compositor\n");
            exit(EXIT_FAILURE);
      }

      if (shell_init(ec) < 0)
            exit(EXIT_FAILURE);

      if (xserver)
            wlsc_xserver_init(display);

      if (wl_display_add_socket(display, option_socket_name)) {
            fprintf(stderr, "failed to add socket: %m\n");
            exit(EXIT_FAILURE);
      }

      loop = wl_display_get_event_loop(ec->wl_display);
      wl_event_loop_add_signal(loop, SIGTERM, on_term_signal, ec);
      wl_event_loop_add_signal(loop, SIGINT, on_term_signal, ec);

      wl_list_init(&child_process_list);
      wl_event_loop_add_signal(loop, SIGCHLD, sigchld_handler, NULL);

      wl_display_run(display);

      if (ec->has_bind_display)
            ec->unbind_display(ec->display, display);
      wl_display_destroy(display);

      ec->destroy(ec);

      return 0;
}

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