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[Gerry Boland <1458694@xxxxxxxxxxxxxxxxxx>]

Emulator faling also because of
https://bugs.launchpad.net/mir/+bug/1486535

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https://bugs.launchpad.net/bugs/1458694

Title:
  [vivid-overlay] unity8 fails to start on the emulator

Status in Canonical System Image:
  In Progress
Status in ubuntu-ui-toolkit package in Ubuntu:
  In Progress

Bug description:
  phablet@ubuntu-phablet:~$ system-image-cli -i
  current build number: 140
  device name: generic_x86
  channel: ubuntu-touch/rc-proposed/ubuntu
  last update: 2015-05-25 12:02:10
  version version: 140
  version ubuntu: 20150525
  version device: 20150210
  version custom: 20150525

  When starting unity8 (this started at image 136, probably when mir
  0.13 landed):

  phablet@ubuntu-phablet:~$ cat ./.cache/upstart/unity8.log
  ()
  [1432595001.896139] mirplatform: Found graphics driver: dummy
  [1432595001.898447] mirplatform: Found graphics driver: android
  qtmir.mir: MirServer created
  [1432595003.675225] Server: Starting
  [1432595003.679331] Loader: Loading modules from: /usr/lib/i386-linux-gnu/mir/server-platform
  [1432595003.679501] Loader: Loading module: /usr/lib/i386-linux-gnu/mir/server-platform/graphics-dummy.so
  [1432595003.680673] Loader: Loading module: /usr/lib/i386-linux-gnu/mir/server-platform/input-stub.so
  [1432595003.681107] <WARNING> Loader: Failed to load module: /usr/lib/i386-linux-gnu/mir/server-platform/input-stub.so (error was:/usr/lib/i386-linux-gnu/mir/server-platform/input-stub.so: undefined symbol: _ZN3mir6events10make_eventExx17MirKeyboardActionjij)
  [1432595003.684868] Loader: Loading module: /usr/lib/i386-linux-gnu/mir/server-platform/graphics-android.so.2
  [1432595003.685014] mirplatform: Found graphics driver: dummy
  [1432595003.685211] mirplatform: Found graphics driver: android
  [1432595003.685416] Platform Loader: Selected driver: android (version 0.13.0)
  qtmir.mir: PromptSessionListener::PromptSessionListener - this= PromptSessionListener(0x9679764)
  qtmir.mir: SessionListener::SessionListener - this= SessionListener(0x9676d24)
  qtmir.mir: MirShell::MirShell
  [1432595003.883766] DisplayServer: Mir version 0.13.0
  QtCompositor::setAllWindowsExposed true
  qtmir.clipboard: D-Bus registration successful.
  Mode argument was not provided or was set to an illegal value. Using default value of --mode= "full-greeter"
  Cannot create window: no screens available

  With version 135 it starts fine, but not fully functional, giving this
  error:

  QOpenGLShader::compile(Fragment): 0:2(12): warning: extension `GL_OES_standard_derivatives' unsupported in fragment shader
  0:2(1): error: #extension directive is not allowed in the middle of a shader

  *** Problematic Fragment shader source code ***
  #extension GL_OES_standard_derivatives : enable  // Enable dFdy() on OpenGL ES 2.
  #define lowp
  #define mediump
  #define highp

  // Copyright © 2015 Canonical Ltd.
  //
  // This program is free software; you can redistribute it and/or modify
  // it under the terms of the GNU Lesser General Public License as published by
  // the Free Software Foundation; version 3.
  //
  // 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 Lesser General Public License for more details.
  //
  // You should have received a copy of the GNU Lesser General Public License
  // along with this program.  If not, see <http://www.gnu.org/licenses/>.
  //
  // Author: Loïc Molinari <loic.molinari@xxxxxxxxxxxxx>

  // Static flow control (branching on a uniform value) is fast on most GPUs (including ultra-low
  // power ones) because it allows to use the same shader execution path for an entire draw call. We
  // rely on that technique here (also known as "uber-shader" solution) to avoid the complexity of
  // dealing with a multiple shaders solution.
  // FIXME(loicm) Validate GPU behavior with regards to static flow control.

  uniform sampler2D shapeTexture;
  uniform sampler2D sourceTexture;
  uniform lowp vec2 dfdtFactors;
  uniform lowp vec2 opacityFactors;
  uniform lowp float sourceOpacity;
  uniform lowp float distanceAA;
  uniform bool textured;
  uniform mediump int aspect;

  varying mediump vec2 shapeCoord;
  varying mediump vec4 sourceCoord;
  varying lowp vec4 backgroundColor;

  const mediump int FLAT  = 0x08;  // 1 << 3
  const mediump int INSET = 0x10;  // 1 << 4

  void main(void)
  {
      lowp vec4 shapeData = texture2D(shapeTexture, shapeCoord);
      lowp vec4 color = backgroundColor;

      // FIXME(loicm) Would be better to use a bitfield but bitwise ops have only been integrated in
      //     GLSL 1.3 (OpenGL 3) and GLSL ES 3 (OpenGL ES 3).
      if (textured) {
          // Blend the source over the current color.
          // FIXME(loicm) sign() is far from optimal. Call texture2D() at beginning of scope.
          lowp vec2 axisMask = -sign((sourceCoord.zw * sourceCoord.zw) - vec2(1.0));
          lowp float mask = clamp(axisMask.x + axisMask.y, 0.0, 1.0);
          lowp vec4 source = texture2D(sourceTexture, sourceCoord.st) * vec4(sourceOpacity * mask);
          color = vec4(1.0 - source.a) * color + source;
      }

      // Get screen-space derivative of texture coordinate t representing the normalized distance
      // between 2 pixels. dFd*() unfortunately have to be called outside of branches in order to work
      // correctly with VMware's "Gallium 0.4 on SVGA3D".
      lowp vec2 derivatives = vec2(dFdx(shapeCoord.t), dFdy(shapeCoord.t));
      lowp float dfdt = dfdtFactors.x != 0.0 ? derivatives.x : derivatives.y;

      if (aspect == FLAT) {
          // Mask the current color with an anti-aliased and resolution independent shape mask built
          // from distance fields.
          lowp float distanceMin = abs(dfdt) * -distanceAA + 0.5;
          lowp float distanceMax = abs(dfdt) * distanceAA + 0.5;
          color *= smoothstep(distanceMin, distanceMax, shapeData.b);

      } else if (aspect == INSET) {
          // The vertex layout of the shape is made so that the derivative is negative from top to
          // middle and positive from middle to bottom.
          lowp float shapeSide = dfdt * dfdtFactors.y <= 0.0 ? 0.0 : 1.0;
          // Blend the shape inner shadow over the current color. The shadow color is black, its
          // translucency is stored in the texture.
          lowp float shadow = shapeData[int(shapeSide)];
          color = vec4(1.0 - shadow) * color + vec4(0.0, 0.0, 0.0, shadow);
          // Get the anti-aliased and resolution independent shape mask using distance fields.
          lowp float distanceMin = abs(dfdt) * -distanceAA + 0.5;
          lowp float distanceMax = abs(dfdt) * distanceAA + 0.5;
          lowp vec2 mask = smoothstep(distanceMin, distanceMax, shapeData.ba);
          // Get the bevel color. The bevel is made of the top mask masked with the bottom mask. A
          // gradient from the bottom (1) to the middle (0) of the shape is used to factor out values
          // resulting from the mask anti-aliasing. The bevel color is white with 60% opacity.
          lowp float bevel = (mask.x * -mask.y) + mask.x;  // -ab + a = a(1 - b)
          lowp float gradient = clamp((shapeSide * -shapeCoord.t) + shapeSide, 0.0, 1.0);
          bevel *= gradient * 0.6;
          // Mask the current color then blend the bevel over the resulting color. We simply use
          // additive blending since the bevel has already been masked.
          color = (color * vec4(mask[int(shapeSide)])) + vec4(bevel);
      }

      gl_FragColor = color * opacityFactors.xxxy;
  }

  ***
  shader compilation failed: 
  ""

  Adb is broken because of bug 1458043, so use the following workaround
  to get it to work again:

  $ sudo ubuntu-emulator create --channel=ubuntu-touch/rc-proposed/ubuntu test_x86 --use-raw-disk
  $ mkdir -p /tmp/mount1 /tmp/mount2
  $ sudo mount ~/.local/share/ubuntu-emulator/test_x86/sdcard.img /tmp/mount1
  $ sudo mount /tmp/mount1/system.img /tmp/mount2
  $ sudo vi /tmp/mount2/var/lib/lxc/android/pre-start.d/20-no-default-prop-adb
  #! /bin/sh

  # Avoid changing the the property when running on the emulator
  if ! grep -q "qemu=1" /proc/cmdline; then
      sed -i '/^persist.sys.usb.config=.*/d' $LXC_ROOTFS_PATH/default.prop || true
  fi
  $ sudo umount /tmp/mount2
  $ sudo umount /tmp/mount1

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