// Copyright 2012 The Chromium 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 "cc/output/delegating_renderer.h"

#include <set>
#include <string>
#include <vector>

#include "base/debug/trace_event.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "cc/output/compositor_frame_ack.h"
#include "cc/quads/checkerboard_draw_quad.h"
#include "cc/quads/debug_border_draw_quad.h"
#include "cc/quads/render_pass.h"
#include "cc/quads/render_pass_draw_quad.h"
#include "cc/quads/solid_color_draw_quad.h"
#include "cc/quads/texture_draw_quad.h"
#include "cc/quads/tile_draw_quad.h"
#include "cc/quads/yuv_video_draw_quad.h"
#include "cc/resources/resource_provider.h"
#include "gpu/command_buffer/client/context_support.h"
#include "gpu/command_buffer/common/gpu_memory_allocation.h"
#include "third_party/WebKit/public/platform/WebGraphicsContext3D.h"
#include "third_party/khronos/GLES2/gl2ext.h"

using blink::WebGraphicsContext3D;

namespace cc {

scoped_ptr<DelegatingRenderer> DelegatingRenderer::Create(
    RendererClient* client,
    const LayerTreeSettings* settings,
    OutputSurface* output_surface,
    ResourceProvider* resource_provider) {
  scoped_ptr<DelegatingRenderer> renderer(new DelegatingRenderer(
      client, settings, output_surface, resource_provider));
  if (!renderer->Initialize())
    return scoped_ptr<DelegatingRenderer>();
  return renderer.Pass();
}

DelegatingRenderer::DelegatingRenderer(RendererClient* client,
                                       const LayerTreeSettings* settings,
                                       OutputSurface* output_surface,
                                       ResourceProvider* resource_provider)
    : Renderer(client, settings),
      output_surface_(output_surface),
      resource_provider_(resource_provider),
      visible_(true) {
  DCHECK(resource_provider_);
}

bool DelegatingRenderer::Initialize() {
  capabilities_.using_partial_swap = false;
  capabilities_.max_texture_size = resource_provider_->max_texture_size();
  capabilities_.best_texture_format = resource_provider_->best_texture_format();
  capabilities_.allow_partial_texture_updates = false;
  capabilities_.using_offscreen_context3d = false;

  if (!output_surface_->context_provider()) {
    capabilities_.using_shared_memory_resources = true;
    capabilities_.using_map_image = settings_->use_map_image;
    return true;
  }

  const ContextProvider::Capabilities& caps =
      output_surface_->context_provider()->ContextCapabilities();

  DCHECK(!caps.iosurface || caps.texture_rectangle);

  capabilities_.using_egl_image = caps.egl_image_external;
  capabilities_.using_map_image = settings_->use_map_image && caps.map_image;

  return true;
}

DelegatingRenderer::~DelegatingRenderer() {}

const RendererCapabilities& DelegatingRenderer::Capabilities() const {
  return capabilities_;
}

bool DelegatingRenderer::CanReadPixels() const { return false; }

static ResourceProvider::ResourceId AppendToArray(
    ResourceProvider::ResourceIdArray* array,
    ResourceProvider::ResourceId id) {
  array->push_back(id);
  return id;
}

void DelegatingRenderer::DrawFrame(RenderPassList* render_passes_in_draw_order,
                                   ContextProvider* offscreen_context_provider,
                                   float device_scale_factor,
                                   gfx::Rect device_viewport_rect,
                                   gfx::Rect device_clip_rect,
                                   bool allow_partial_swap,
                                   bool disable_picture_quad_image_filtering) {
  TRACE_EVENT0("cc", "DelegatingRenderer::DrawFrame");

  DCHECK(!delegated_frame_data_);

  delegated_frame_data_ = make_scoped_ptr(new DelegatedFrameData);
  DelegatedFrameData& out_data = *delegated_frame_data_;
  // Move the render passes and resources into the |out_frame|.
  out_data.render_pass_list.swap(*render_passes_in_draw_order);

  // Collect all resource ids in the render passes into a ResourceIdArray.
  ResourceProvider::ResourceIdArray resources;
  DrawQuad::ResourceIteratorCallback append_to_array =
      base::Bind(&AppendToArray, &resources);
  for (size_t i = 0; i < out_data.render_pass_list.size(); ++i) {
    RenderPass* render_pass = out_data.render_pass_list.at(i);
    for (size_t j = 0; j < render_pass->quad_list.size(); ++j)
      render_pass->quad_list[j]->IterateResources(append_to_array);
  }
  resource_provider_->PrepareSendToParent(resources, &out_data.resource_list);
}

void DelegatingRenderer::SwapBuffers(const CompositorFrameMetadata& metadata) {
  TRACE_EVENT0("cc", "DelegatingRenderer::SwapBuffers");
  CompositorFrame compositor_frame;
  compositor_frame.metadata = metadata;
  compositor_frame.delegated_frame_data = delegated_frame_data_.Pass();
  output_surface_->SwapBuffers(&compositor_frame);
}

void DelegatingRenderer::GetFramebufferPixels(void* pixels, gfx::Rect rect) {
  NOTREACHED();
}

void DelegatingRenderer::ReceiveSwapBuffersAck(
    const CompositorFrameAck& ack) {
  resource_provider_->ReceiveReturnsFromParent(ack.resources);
}

bool DelegatingRenderer::IsContextLost() {
  ContextProvider* context_provider = output_surface_->context_provider();
  if (!context_provider)
    return false;
  return context_provider->IsContextLost();
}

void DelegatingRenderer::SetVisible(bool visible) {
  if (visible == visible_)
    return;

  visible_ = visible;
  ContextProvider* context_provider = output_surface_->context_provider();
  if (!visible_) {
    TRACE_EVENT0("cc", "DelegatingRenderer::SetVisible dropping resources");
    resource_provider_->ReleaseCachedData();
    if (context_provider)
      context_provider->Context3d()->flush();
  }
  // We loop visibility to the GPU process, since that's what manages memory.
  // That will allow it to feed us with memory allocations that we can act
  // upon.
  DCHECK(context_provider);
  context_provider->ContextSupport()->SetSurfaceVisible(visible);
}

void DelegatingRenderer::SendManagedMemoryStats(size_t bytes_visible,
                                                size_t bytes_visible_and_nearby,
                                                size_t bytes_allocated) {
  ContextProvider* context_provider = output_surface_->context_provider();
  if (!context_provider) {
    // TODO(piman): software path.
    NOTIMPLEMENTED();
    return;
  }
  gpu::ManagedMemoryStats stats;
  stats.bytes_required = bytes_visible;
  stats.bytes_nice_to_have = bytes_visible_and_nearby;
  stats.bytes_allocated = bytes_allocated;
  stats.backbuffer_requested = false;

  context_provider->ContextSupport()->SendManagedMemoryStats(stats);
}

}  // namespace cc