First round of dead file removal

experimental/flocking_geese/nacl_app/flock.cc

-// Copyright (c) 2011 The Native Client Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "nacl_app/flock.h"
-
-#include <algorithm>
-#include <cmath>
-#include <cstring>
-#include <string>
-
-#include "nacl_app/scoped_pixel_lock.h"
-#include "ppapi/cpp/size.h"
-#include "threading/scoped_mutex_lock.h"
-
-namespace {
-const uint32_t kBackgroundColor = 0xFFFFFFFF;  // Opaque white.
-
-// Throttle the simulation to run a fixed number of ticks per Render() call.
-const int32_t kSimulationTicksPerRender = 16;
-
-// The goose sprites rotate in increments of 5 degrees.
-const double kGooseHeadingIncrement = (5.0 * M_PI) / 180.0;
-}  // namespace
-
-namespace flocking_geese {
-
-Flock::Flock() : flock_simulation_thread_(NULL),
-                 sim_state_condition_(kSimulationStopped),
-                 simulation_mode_(kPaused),
-                 tick_counter_(0) {
-  pthread_mutex_init(&flock_simulation_mutex_, NULL);
-}
-
-Flock::~Flock() {
-  set_is_simulation_running(false);
-  if (flock_simulation_thread_) {
-    pthread_join(flock_simulation_thread_, NULL);
-  }
-  pthread_mutex_destroy(&flock_simulation_mutex_);
-}
-
-void Flock::StartSimulation() {
-  pthread_create(&flock_simulation_thread_, NULL, FlockSimulation, this);
-}
-
-void Flock::set_simulation_mode(Flock::SimulationMode new_mode) {
-  simulation_mode_.Lock();
-  if (new_mode == kRunning)
-    set_tick_counter(0);
-  simulation_mode_.UnlockWithCondition(new_mode);
-}
-
-Flock::SimulationMode Flock::WaitForRunMode() {
-  simulation_mode_.LockWhenCondition(kRunning);
-  simulation_mode_.Unlock();
-  return simulation_mode();
-}
-
-void Flock::SetAttractorAtIndex(const Vector2& attractor, size_t index) {
-  if (index >= attractors_.size()) {
-    attractors_.resize(index + 1, Vector2());
-  }
-  attractors_[index] = attractor;
-}
-
-void Flock::Resize(const pp::Size& size) {
-  flockBounds_.SetRect(0, 0,
-                       std::max(size.width(), 0),
-                       std::max(size.height(), 0));
-}
-
-void Flock::ResetFlock(size_t size, const Vector2& initialLocation) {
-  threading::ScopedMutexLock scoped_mutex(simulation_mutex());
-  if (!scoped_mutex.is_valid())
-    return;
-  geese_.resize(size + 1);
-  geese_.assign(size, Goose(initialLocation));
-  frame_counter_.Reset();
-}
-
-void Flock::SimulationTick() {
-  frame_counter_.BeginFrame();
-  for (std::vector<Goose>::iterator goose = geese_.begin();
-       goose < geese_.end();
-       ++goose) {
-    goose->SimulationTick(geese_, attractors_, flockBounds_);
-  }
-  frame_counter_.EndFrame();
-}
-
-void Flock::Render() {
-  ScopedPixelLock scoped_pixel_lock(shared_pixel_buffer_);
-  uint32_t* pixel_buffer = scoped_pixel_lock.pixels();
-  if (pixel_buffer == NULL || goose_sprite_ == NULL) {
-    // Note that if the pixel buffer never gets initialized, this won't ever
-    // paint anything.  Which is probably the right thing to do.  Also, this
-    // clause means that the image will not get the very first few sim cells,
-    // since it's possible that this thread starts before the pixel buffer is
-    // initialized.
-    return;
-  }
-  // Clear out the pixel buffer, then render all the geese.
-  pp::Rect canvas_bounds(pp::Point(), shared_pixel_buffer_->size());
-  int32_t canvas_width = canvas_bounds.size().width();
-  int32_t canvas_height = canvas_bounds.size().height();
-  const size_t pixel_count = canvas_width * canvas_height;
-  std::fill(pixel_buffer, pixel_buffer + pixel_count, kBackgroundColor);
-  threading::ScopedMutexLock scoped_mutex(simulation_mutex());
-  if (!scoped_mutex.is_valid())
-    return;
-
-  int32_t sprite_stamp_width = goose_sprite_->size().height();
-  pp::Rect sprite_src_rect(0, 0,
-                           sprite_stamp_width, goose_sprite_->size().height());
-  for (std::vector<Goose>::const_iterator goose = geese_.begin();
-       goose < geese_.end();
-       ++goose) {
-    pp::Point dest_point(goose->location().x() - sprite_stamp_width / 2,
-                         goose->location().y() - sprite_stamp_width / 2);
-    double heading = goose->velocity().Heading();
-    if (heading < 0.0)
-      heading = M_PI * 2.0 + heading;
-    int32_t sprite_index =
-        static_cast<int32_t>(heading / kGooseHeadingIncrement) *
-        sprite_stamp_width;
-    sprite_src_rect.set_x(sprite_index);
-    goose_sprite_->CompositeFromRectToPoint(
-        sprite_src_rect,
-        pixel_buffer, canvas_bounds, 0,
-        dest_point);
-  }
-
-  // Hack: draw a blue rectangle at each attractor.
-  // TODO(dspringer): This is ridiculous.  Fix this when a proper graphics lib
-  // available.
-  for (std::vector<Vector2>::const_iterator attractor = attractors_.begin();
-       attractor < attractors_.end();
-       ++attractor) {
-    int32_t x = std::max(static_cast<int32_t>(attractor->x()) - 2, 0);
-    int32_t y = std::max(static_cast<int32_t>(attractor->y()) - 2, 0);
-    int32_t w = 4, h = 4;
-    int32_t rw = canvas_width;
-    if (x + w >= rw) { x = rw - 1 - w; }
-    if (y + h >= canvas_height) { y = canvas_height - 1 - h; }
-    uint32_t* rect = pixel_buffer + y * rw + x;
-    for (int32_t row = 0; row < h; ++row) {
-      uint32_t* scanline = rect;
-      rect += rw;
-      *scanline++ = 0xFF0000FF;
-      *scanline++ = 0xFF0000FF;
-      *scanline++ = 0xFF0000FF;
-      *scanline++ = 0xFF0000FF;
-    }
-  }
-
-  if (simulation_mode() == kRenderThrottle) {
-    set_simulation_mode(kRunning);
-  }
-}
-
-void* Flock::FlockSimulation(void* param) {
-  Flock* flock = static_cast<Flock*>(param);
-  // Run the Life simulation in an endless loop.  Shut this down when
-  // is_simulation_running() returns |false|.
-  flock->set_is_simulation_running(true);
-  flock->set_tick_counter(0);
-  while (flock->is_simulation_running()) {
-    flock->WaitForRunMode();
-    flock->SimulationTick();
-    // Throttle the simulation so it doesn't outrun the browser by too much.
-    if (flock->increment_tick_counter() > kSimulationTicksPerRender) {
-      flock->set_simulation_mode(kRenderThrottle);
-    }
-    //flock->Render();
-  }
-  return NULL;
-}
-}  // namespace flocking_geese
-