// Copyright 2018 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 "VkFramebuffer.hpp"
#include "VkImageView.hpp"
#include "VkRenderPass.hpp"
#include <algorithm>
#include <memory.h>

namespace vk
{

Framebuffer::Framebuffer(const VkFramebufferCreateInfo* pCreateInfo, void* mem) :
	attachmentCount(pCreateInfo->attachmentCount),
	attachments(reinterpret_cast<ImageView**>(mem))
{
	for(uint32_t i = 0; i < attachmentCount; i++)
	{
		attachments[i] = vk::Cast(pCreateInfo->pAttachments[i]);
	}
}

void Framebuffer::destroy(const VkAllocationCallbacks* pAllocator)
{
	vk::deallocate(attachments, pAllocator);
}

void Framebuffer::clear(const RenderPass* renderPass, uint32_t clearValueCount, const VkClearValue* pClearValues, const VkRect2D& renderArea)
{
	ASSERT(attachmentCount == renderPass->getAttachmentCount());

	const uint32_t count = std::min(clearValueCount, attachmentCount);
	for (uint32_t i = 0; i < count; i++)
	{
		const VkAttachmentDescription attachment = renderPass->getAttachment(i);

		VkImageAspectFlags aspectMask = Format(attachment.format).getAspects();
		if (attachment.loadOp != VK_ATTACHMENT_LOAD_OP_CLEAR)
			aspectMask &= VK_IMAGE_ASPECT_STENCIL_BIT;
		if (attachment.stencilLoadOp != VK_ATTACHMENT_LOAD_OP_CLEAR)
			aspectMask &= ~VK_IMAGE_ASPECT_STENCIL_BIT;

		if (!aspectMask || !renderPass->isAttachmentUsed(i))
		{
			continue;
		}

		if (renderPass->isMultiView())
		{
			attachments[i]->clearWithLayerMask(pClearValues[i], aspectMask, renderArea,
											   renderPass->getAttachmentViewMask(i));
		}
		else
		{
			attachments[i]->clear(pClearValues[i], aspectMask, renderArea);
		}
	}
}

void Framebuffer::clearAttachment(const RenderPass* renderPass, uint32_t subpassIndex, const VkClearAttachment& attachment, const VkClearRect& rect)
{
	VkSubpassDescription subpass = renderPass->getSubpass(subpassIndex);

	if (attachment.aspectMask == VK_IMAGE_ASPECT_COLOR_BIT)
	{
		ASSERT(attachment.colorAttachment < subpass.colorAttachmentCount);
		uint32_t attachmentIndex = subpass.pColorAttachments[attachment.colorAttachment].attachment;

		if (attachmentIndex != VK_ATTACHMENT_UNUSED)
		{
			ASSERT(attachmentIndex < attachmentCount);
			ImageView *imageView = attachments[attachmentIndex];

			if (renderPass->isMultiView())
			{
				imageView->clearWithLayerMask(attachment.clearValue, attachment.aspectMask, rect.rect,
											  renderPass->getViewMask(subpassIndex));
			}
			else
			{
				imageView->clear(attachment.clearValue, attachment.aspectMask, rect);
			}
		}
	}
	else if (attachment.aspectMask & (VK_IMAGE_ASPECT_DEPTH_BIT | VK_IMAGE_ASPECT_STENCIL_BIT))
	{
		ASSERT(subpass.pDepthStencilAttachment->attachment < attachmentCount);
		ImageView *imageView = attachments[subpass.pDepthStencilAttachment->attachment];

		if (renderPass->isMultiView())
		{
			imageView->clearWithLayerMask(attachment.clearValue, attachment.aspectMask, rect.rect,
										  renderPass->getViewMask(subpassIndex));
		}
		else
		{
			imageView->clear(attachment.clearValue, attachment.aspectMask, rect);
		}
	}
}

ImageView *Framebuffer::getAttachment(uint32_t index) const
{
	return attachments[index];
}

void Framebuffer::resolve(const RenderPass* renderPass, uint32_t subpassIndex)
{
	auto const& subpass = renderPass->getSubpass(subpassIndex);
	if(subpass.pResolveAttachments)
	{
		for(uint32_t i = 0; i < subpass.colorAttachmentCount; i++)
		{
			uint32_t resolveAttachment = subpass.pResolveAttachments[i].attachment;
			if(resolveAttachment != VK_ATTACHMENT_UNUSED)
			{
				ImageView *imageView = attachments[subpass.pColorAttachments[i].attachment];
				if (renderPass->isMultiView())
				{
					imageView->resolveWithLayerMask(attachments[resolveAttachment],
													renderPass->getViewMask(subpassIndex));
				}
				else
				{
					imageView->resolve(attachments[resolveAttachment]);
				}
			}
		}
	}
}

size_t Framebuffer::ComputeRequiredAllocationSize(const VkFramebufferCreateInfo* pCreateInfo)
{
	return pCreateInfo->attachmentCount * sizeof(void*);
}

} // namespace vk