// Copyright 2016 The SwiftShader 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 "GrallocAndroid.hpp"
#include "Debug.hpp"

#ifdef HAVE_GRALLOC1
#	include <sync/sync.h>
#endif

GrallocModule *GrallocModule::getInstance()
{
	static GrallocModule instance;
	return &instance;
}

GrallocModule::GrallocModule()
{
	const hw_module_t *module = nullptr;
	hw_get_module(GRALLOC_HARDWARE_MODULE_ID, &module);

	m_major_version = (module->module_api_version >> 8) & 0xff;
	switch(m_major_version)
	{
		case 0:
			m_module = reinterpret_cast<const gralloc_module_t *>(module);
			break;
		case 1:
#ifdef HAVE_GRALLOC1
			gralloc1_open(module, &m_gralloc1_device);
			m_gralloc1_lock = (GRALLOC1_PFN_LOCK)m_gralloc1_device->getFunction(m_gralloc1_device, GRALLOC1_FUNCTION_LOCK);
			m_gralloc1_unlock = (GRALLOC1_PFN_UNLOCK)m_gralloc1_device->getFunction(m_gralloc1_device, GRALLOC1_FUNCTION_UNLOCK);
			break;
#endif
		default:
			TRACE("unknown gralloc major version (%d)", m_major_version);
			break;
	}
}

int GrallocModule::lock(buffer_handle_t handle, int usage, int left, int top, int width, int height, void **vaddr)
{
	switch(m_major_version)
	{
		case 0:
		{
			return m_module->lock(m_module, handle, usage, left, top, width, height, vaddr);
		}
		case 1:
#ifdef HAVE_GRALLOC1
		{
			gralloc1_rect_t outRect{};
			outRect.left = left;
			outRect.top = top;
			outRect.width = width;
			outRect.height = height;
			return m_gralloc1_lock(m_gralloc1_device, handle, usage, usage, &outRect, vaddr, -1);
		}
#endif
		default:
		{
			TRACE("no gralloc module to lock");
			return -1;
		}
	}
}

int GrallocModule::unlock(buffer_handle_t handle)
{
	switch(m_major_version)
	{
		case 0:
		{
			return m_module->unlock(m_module, handle);
		}
		case 1:
#ifdef HAVE_GRALLOC1
		{
			int32_t fenceFd = -1;
			int error = m_gralloc1_unlock(m_gralloc1_device, handle, &fenceFd);
			if(!error)
			{
				sync_wait(fenceFd, -1);
				close(fenceFd);
			}
			return error;
		}
#endif
		default:
		{
			TRACE("no gralloc module to unlock");
			return -1;
		}
	}
}