// Copyright 2018 The Cobalt Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include <memory>

#include "cobalt/renderer/get_default_rasterizer_for_platform.h"

#include "cobalt/configuration/configuration.h"
#include "cobalt/renderer/backend/graphics_context.h"
#include "cobalt/renderer/rasterizer/egl/hardware_rasterizer.h"
#include "cobalt/renderer/rasterizer/egl/software_rasterizer.h"
#include "cobalt/renderer/rasterizer/skia/hardware_rasterizer.h"
#include "cobalt/renderer/rasterizer/stub/rasterizer.h"
#include "cobalt/renderer/renderer_module.h"  // nogncheck
#include "starboard/gles.h"

namespace cobalt {
namespace renderer {

namespace {

std::unique_ptr<rasterizer::Rasterizer> CreateStubRasterizer(
    backend::GraphicsContext* graphics_context,
    const RendererModule::Options& options) {
  return std::unique_ptr<rasterizer::Rasterizer>(
      new rasterizer::stub::Rasterizer());
}

std::unique_ptr<rasterizer::Rasterizer> CreateGLESSoftwareRasterizer(
    backend::GraphicsContext* graphics_context,
    const RendererModule::Options& options) {
  return std::unique_ptr<rasterizer::Rasterizer>(
      new rasterizer::egl::SoftwareRasterizer(
          graphics_context, options.purge_skia_font_caches_on_destruction));
}

std::unique_ptr<rasterizer::Rasterizer> CreateGLESHardwareRasterizer(
    backend::GraphicsContext* graphics_context,
    const RendererModule::Options& options) {
  return std::unique_ptr<rasterizer::Rasterizer>(
      new rasterizer::egl::HardwareRasterizer(
          graphics_context, options.skia_glyph_texture_atlas_dimensions.width(),
          options.skia_glyph_texture_atlas_dimensions.height(),
          options.skia_cache_size_in_bytes,
          options.scratch_surface_cache_size_in_bytes,
          options.offscreen_target_cache_size_in_bytes,
          options.purge_skia_font_caches_on_destruction,
          options.force_deterministic_rendering));
}

std::unique_ptr<rasterizer::Rasterizer> CreateSkiaHardwareRasterizer(
    backend::GraphicsContext* graphics_context,
    const RendererModule::Options& options) {
  return std::unique_ptr<rasterizer::Rasterizer>(
      new rasterizer::skia::HardwareRasterizer(
          graphics_context, options.skia_glyph_texture_atlas_dimensions.width(),
          options.skia_glyph_texture_atlas_dimensions.height(),
          options.skia_cache_size_in_bytes,
          options.scratch_surface_cache_size_in_bytes,
          options.purge_skia_font_caches_on_destruction,
          options.force_deterministic_rendering));
}

}  // namespace

RasterizerInfo GetDefaultRasterizerForPlatform() {
  std::string rasterizer_type =
      configuration::Configuration::GetInstance()->CobaltRasterizerType();
  if (rasterizer_type == "stub") {
    return {"stub", base::Bind(&CreateStubRasterizer)};
  }
  if (SbGetGlesInterface()) {
    if (rasterizer_type == "direct-gles") {
      return {"gles", base::Bind(&CreateGLESHardwareRasterizer)};
    } else {
      return {"skia", base::Bind(&CreateSkiaHardwareRasterizer)};
    }
  } else {
    SB_LOG(ERROR) << "GLES2 must be available.";
    SB_DCHECK(false);
    return {};
  }
}

}  // namespace renderer
}  // namespace cobalt