// Copyright 2016 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 "ui/gl/init/gl_initializer.h"

#include "base/bind.h"
#include "base/logging.h"
#include "ui/gl/gl_bindings.h"
#include "ui/gl/gl_egl_api_implementation.h"
#include "ui/gl/gl_gl_api_implementation.h"
#include "ui/gl/gl_implementation_osmesa.h"
#include "ui/gl/gl_osmesa_api_implementation.h"
#include "ui/gl/gl_surface_egl.h"
#include "ui/ozone/public/ozone_platform.h"
#include "ui/ozone/public/surface_factory_ozone.h"

namespace gl {
namespace init {

namespace {

ui::SurfaceFactoryOzone* GetSurfaceFactory() {
  return ui::OzonePlatform::GetInstance()->GetSurfaceFactoryOzone();
}

bool InitializeStaticEGLInternal() {
  if (!GetSurfaceFactory()->LoadEGLGLES2Bindings(
          base::Bind(&AddGLNativeLibrary),
          base::Bind(&SetGLGetProcAddressProc))) {
    return false;
  }

  SetGLImplementation(kGLImplementationEGLGLES2);
  InitializeStaticGLBindingsGL();
  InitializeStaticGLBindingsEGL();

  return true;
}

}  // namespace

bool InitializeGLOneOffPlatform() {
  switch (GetGLImplementation()) {
    case kGLImplementationEGLGLES2:
      if (!GLSurfaceEGL::InitializeOneOff(
              GetSurfaceFactory()->GetNativeDisplay())) {
        LOG(ERROR) << "GLSurfaceEGL::InitializeOneOff failed.";
        return false;
      }
      return true;
    case kGLImplementationOSMesaGL:
    case kGLImplementationMockGL:
      return true;
    default:
      return false;
  }
}

bool InitializeStaticGLBindings(GLImplementation implementation) {
  // Prevent reinitialization with a different implementation. Once the gpu
  // unit tests have initialized with kGLImplementationMock, we don't want to
  // later switch to another GL implementation.
  DCHECK_EQ(kGLImplementationNone, GetGLImplementation());
  ui::OzonePlatform::InitializeForGPU();

  switch (implementation) {
    case kGLImplementationOSMesaGL:
      return InitializeStaticGLBindingsOSMesaGL();
    case kGLImplementationEGLGLES2:
      return InitializeStaticEGLInternal();
    case kGLImplementationMockGL:
      SetGLImplementation(kGLImplementationMockGL);
      InitializeStaticGLBindingsGL();
      return true;
    default:
      NOTREACHED();
  }

  return false;
}

void InitializeDebugGLBindings() {
  InitializeDebugGLBindingsEGL();
  InitializeDebugGLBindingsGL();
  InitializeDebugGLBindingsOSMESA();
}

void ClearGLBindingsPlatform() {
  ClearGLBindingsEGL();
  ClearGLBindingsGL();
  ClearGLBindingsOSMESA();
}

}  // namespace init
}  // namespace gl