/*
 * MVKCmdPipeline.mm
 *
 * Copyright (c) 2015-2020 The Brenwill Workshop Ltd. (http://www.brenwill.com)
 *
 * 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 "MVKCmdPipeline.h"
#include "MVKCommandBuffer.h"
#include "MVKCommandPool.h"
#include "MVKImage.h"
#include "MVKBuffer.h"
#include "MVKPipeline.h"
#include "MVKFoundation.h"
#include "MVKEnvironment.h"
#include "mvk_datatypes.hpp"


#pragma mark -
#pragma mark MVKCmdPipelineBarrier

template <size_t N>
VkResult MVKCmdPipelineBarrier<N>::setContent(MVKCommandBuffer* cmdBuff,
											  VkPipelineStageFlags srcStageMask,
											  VkPipelineStageFlags dstStageMask,
											  VkDependencyFlags dependencyFlags,
											  uint32_t memoryBarrierCount,
											  const VkMemoryBarrier* pMemoryBarriers,
											  uint32_t bufferMemoryBarrierCount,
											  const VkBufferMemoryBarrier* pBufferMemoryBarriers,
											  uint32_t imageMemoryBarrierCount,
											  const VkImageMemoryBarrier* pImageMemoryBarriers) {
	_srcStageMask = srcStageMask;
	_dstStageMask = dstStageMask;
	_dependencyFlags = dependencyFlags;

	_barriers.clear();	// Clear for reuse
	_barriers.reserve(memoryBarrierCount + bufferMemoryBarrierCount + imageMemoryBarrierCount);

	for (uint32_t i = 0; i < memoryBarrierCount; i++) {
		_barriers.emplace_back(pMemoryBarriers[i]);
	}
	for (uint32_t i = 0; i < bufferMemoryBarrierCount; i++) {
		_barriers.emplace_back(pBufferMemoryBarriers[i]);
	}
	for (uint32_t i = 0; i < imageMemoryBarrierCount; i++) {
		_barriers.emplace_back(pImageMemoryBarriers[i]);
	}

	return VK_SUCCESS;
}

template <size_t N>
void MVKCmdPipelineBarrier<N>::encode(MVKCommandEncoder* cmdEncoder) {

#if MVK_MACOS
	// Calls below invoke MTLBlitCommandEncoder so must apply this first.
	// Check if pipeline barriers are available and we are in a renderpass.
	if (cmdEncoder->getDevice()->_pMetalFeatures->memoryBarriers && cmdEncoder->_mtlRenderEncoder) {
		MTLRenderStages srcStages = mvkMTLRenderStagesFromVkPipelineStageFlags(_srcStageMask, false);
		MTLRenderStages dstStages = mvkMTLRenderStagesFromVkPipelineStageFlags(_dstStageMask, true);

		id<MTLResource> resources[_barriers.size()];
		uint32_t rezCnt = 0;

		for (auto& b : _barriers) {
			switch (b.type) {
				case MVKPipelineBarrier::Memory: {
					MTLBarrierScope scope = (mvkMTLBarrierScopeFromVkAccessFlags(b.srcAccessMask) |
											 mvkMTLBarrierScopeFromVkAccessFlags(b.dstAccessMask));
					[cmdEncoder->_mtlRenderEncoder memoryBarrierWithScope: scope
															  afterStages: srcStages
															 beforeStages: dstStages];
					break;
				}

				case MVKPipelineBarrier::Buffer:
					resources[rezCnt++] = b.mvkBuffer->getMTLBuffer();
					break;

				case MVKPipelineBarrier::Image:
					resources[rezCnt++] = b.mvkImage->getMTLTexture();
					break;

				default:
					break;
			}
		}

		if (rezCnt) {
			[cmdEncoder->_mtlRenderEncoder memoryBarrierWithResources: resources
																count: rezCnt
														  afterStages: srcStages
														 beforeStages: dstStages];
		}
	} else {
		if (coversTextures()) { [cmdEncoder->_mtlRenderEncoder textureBarrier]; }
	}
#endif

	MVKDevice* mvkDvc = cmdEncoder->getDevice();
	MVKCommandUse cmdUse = kMVKCommandUsePipelineBarrier;

	for (auto& b : _barriers) {
		switch (b.type) {
			case MVKPipelineBarrier::Memory:
				mvkDvc->applyMemoryBarrier(_srcStageMask, _dstStageMask, b, cmdEncoder, cmdUse);
				break;

			case MVKPipelineBarrier::Buffer:
				b.mvkBuffer->applyBufferMemoryBarrier(_srcStageMask, _dstStageMask, b, cmdEncoder, cmdUse);
				break;

			case MVKPipelineBarrier::Image:
				b.mvkImage->applyImageMemoryBarrier(_srcStageMask, _dstStageMask, b, cmdEncoder, cmdUse);
				break;

			default:
				break;
		}
	}
}

template <size_t N>
bool MVKCmdPipelineBarrier<N>::coversTextures() {
	for (auto& b : _barriers) {
		switch (b.type) {
			case MVKPipelineBarrier::Memory:	return true;
			case MVKPipelineBarrier::Image: 	return true;
			default: 							break;
		}
	}
	return false;
}

template class MVKCmdPipelineBarrier<1>;
template class MVKCmdPipelineBarrier<4>;
template class MVKCmdPipelineBarrier<32>;


#pragma mark -
#pragma mark MVKCmdBindPipeline

VkResult MVKCmdBindPipeline::setContent(MVKCommandBuffer* cmdBuff,
										VkPipelineBindPoint pipelineBindPoint,
										VkPipeline pipeline) {
	_bindPoint = pipelineBindPoint;
	_pipeline = (MVKPipeline*)pipeline;

	cmdBuff->recordBindPipeline(this);

	return VK_SUCCESS;
}

void MVKCmdBindPipeline::encode(MVKCommandEncoder* cmdEncoder) {
    cmdEncoder->bindPipeline(_bindPoint, _pipeline);
}

bool MVKCmdBindPipeline::isTessellationPipeline() {
	if (_bindPoint == VK_PIPELINE_BIND_POINT_GRAPHICS)
		return ((MVKGraphicsPipeline*)_pipeline)->isTessellationPipeline();
	else
		return false;
}


#pragma mark -
#pragma mark MVKCmdBindDescriptorSets

VkResult MVKCmdBindDescriptorSets::setContent(MVKCommandBuffer* cmdBuff,
											  VkPipelineBindPoint pipelineBindPoint,
											  VkPipelineLayout layout,
											  uint32_t firstSet,
											  uint32_t setCount,
											  const VkDescriptorSet* pDescriptorSets,
											  uint32_t dynamicOffsetCount,
											  const uint32_t* pDynamicOffsets) {
	_pipelineBindPoint = pipelineBindPoint;
	_pipelineLayout = (MVKPipelineLayout*)layout;
	_firstSet = firstSet;

	// Add the descriptor sets
	_descriptorSets.clear();	// Clear for reuse
	_descriptorSets.reserve(setCount);
	for (uint32_t dsIdx = 0; dsIdx < setCount; dsIdx++) {
		_descriptorSets.push_back((MVKDescriptorSet*)pDescriptorSets[dsIdx]);
	}

	// Add the dynamic offsets
	_dynamicOffsets.clear();	// Clear for reuse
	_dynamicOffsets.reserve(dynamicOffsetCount);
	for (uint32_t doIdx = 0; doIdx < dynamicOffsetCount; doIdx++) {
		_dynamicOffsets.push_back(pDynamicOffsets[doIdx]);
	}

	return VK_SUCCESS;
}

void MVKCmdBindDescriptorSets::encode(MVKCommandEncoder* cmdEncoder) {
	_pipelineLayout->bindDescriptorSets(cmdEncoder, _descriptorSets, _firstSet, _dynamicOffsets);
}


#pragma mark -
#pragma mark MVKCmdPushConstants

VkResult MVKCmdPushConstants::setContent(MVKCommandBuffer* cmdBuff,
										 VkPipelineLayout layout,
										 VkShaderStageFlags stageFlags,
										 uint32_t offset,
										 uint32_t size,
										 const void* pValues) {
	_pipelineLayout = (MVKPipelineLayout*)layout;
	_stageFlags = stageFlags;
	_offset = offset;

	_pushConstants.resize(size);
	std::copy_n((char*)pValues, size, _pushConstants.begin());

	return VK_SUCCESS;
}

void MVKCmdPushConstants::encode(MVKCommandEncoder* cmdEncoder) {
    VkShaderStageFlagBits stages[] = {
        VK_SHADER_STAGE_VERTEX_BIT,
        VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT,
        VK_SHADER_STAGE_TESSELLATION_EVALUATION_BIT,
        VK_SHADER_STAGE_FRAGMENT_BIT,
        VK_SHADER_STAGE_COMPUTE_BIT
    };
    for (auto stage : stages) {
        if (mvkAreAllFlagsEnabled(_stageFlags, stage)) {
            cmdEncoder->getPushConstants(stage)->setPushConstants(_offset, _pushConstants);
        }
    }
}


#pragma mark -
#pragma mark MVKCmdPushDescriptorSet

VkResult MVKCmdPushDescriptorSet::setContent(MVKCommandBuffer* cmdBuff,
											 VkPipelineBindPoint pipelineBindPoint,
											 VkPipelineLayout layout,
											 uint32_t set,
											 uint32_t descriptorWriteCount,
											 const VkWriteDescriptorSet* pDescriptorWrites) {
	_pipelineBindPoint = pipelineBindPoint;
	_pipelineLayout = (MVKPipelineLayout*)layout;
	_set = set;

	// Add the descriptor writes
	MVKDevice* mvkDvc = cmdBuff->getDevice();
	clearDescriptorWrites();	// Clear for reuse
	_descriptorWrites.reserve(descriptorWriteCount);
	for (uint32_t dwIdx = 0; dwIdx < descriptorWriteCount; dwIdx++) {
		_descriptorWrites.push_back(pDescriptorWrites[dwIdx]);
		VkWriteDescriptorSet& descWrite = _descriptorWrites.back();
		// Make a copy of the associated data.
		if (descWrite.pImageInfo) {
			auto* pNewImageInfo = new VkDescriptorImageInfo[descWrite.descriptorCount];
			std::copy_n(descWrite.pImageInfo, descWrite.descriptorCount, pNewImageInfo);
			descWrite.pImageInfo = pNewImageInfo;
		}
		if (descWrite.pBufferInfo) {
			auto* pNewBufferInfo = new VkDescriptorBufferInfo[descWrite.descriptorCount];
			std::copy_n(descWrite.pBufferInfo, descWrite.descriptorCount, pNewBufferInfo);
			descWrite.pBufferInfo = pNewBufferInfo;
		}
		if (descWrite.pTexelBufferView) {
			auto* pNewTexelBufferView = new VkBufferView[descWrite.descriptorCount];
			std::copy_n(descWrite.pTexelBufferView, descWrite.descriptorCount, pNewTexelBufferView);
			descWrite.pTexelBufferView = pNewTexelBufferView;
		}
        if (mvkDvc->_enabledExtensions.vk_EXT_inline_uniform_block.enabled) {
            const VkWriteDescriptorSetInlineUniformBlockEXT* pInlineUniformBlock = nullptr;
			for (const auto* next = (VkBaseInStructure*)descWrite.pNext; next; next = next->pNext) {
                switch (next->sType) {
                case VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET_INLINE_UNIFORM_BLOCK_EXT: {
                    pInlineUniformBlock = (VkWriteDescriptorSetInlineUniformBlockEXT*)next;
                    break;
                }
                default:
                    break;
                }
            }
            if (pInlineUniformBlock) {
                auto *pNewInlineUniformBlock = new VkWriteDescriptorSetInlineUniformBlockEXT(*pInlineUniformBlock);
                pNewInlineUniformBlock->pNext = nullptr; // clear pNext just in case, no other extensions are supported at this time
                descWrite.pNext = pNewInlineUniformBlock;
            }
        }
	}

	// Validate by encoding on a null encoder
	encode(nullptr);
	return _pipelineLayout->getConfigurationResult();
}

void MVKCmdPushDescriptorSet::encode(MVKCommandEncoder* cmdEncoder) {
	_pipelineLayout->pushDescriptorSet(cmdEncoder, _descriptorWrites, _set);
}

MVKCmdPushDescriptorSet::~MVKCmdPushDescriptorSet() {
	clearDescriptorWrites();
}

void MVKCmdPushDescriptorSet::clearDescriptorWrites() {
	for (VkWriteDescriptorSet &descWrite : _descriptorWrites) {
		if (descWrite.pImageInfo) { delete[] descWrite.pImageInfo; }
		if (descWrite.pBufferInfo) { delete[] descWrite.pBufferInfo; }
		if (descWrite.pTexelBufferView) { delete[] descWrite.pTexelBufferView; }

		const VkWriteDescriptorSetInlineUniformBlockEXT* pInlineUniformBlock = nullptr;
		for (const auto* next = (VkBaseInStructure*)descWrite.pNext; next; next = next->pNext) {
			switch (next->sType) {
				case VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET_INLINE_UNIFORM_BLOCK_EXT: {
					pInlineUniformBlock = (VkWriteDescriptorSetInlineUniformBlockEXT*)next;
					break;
				}
				default:
					break;
			}
		}
		if (pInlineUniformBlock) { delete pInlineUniformBlock; }
	}
	_descriptorWrites.clear();
}


#pragma mark -
#pragma mark MVKCmdPushDescriptorSetWithTemplate

VkResult MVKCmdPushDescriptorSetWithTemplate::setContent(MVKCommandBuffer* cmdBuff,
														 VkDescriptorUpdateTemplateKHR descUpdateTemplate,
														 VkPipelineLayout layout,
														 uint32_t set,
														 const void* pData) {
	_descUpdateTemplate = (MVKDescriptorUpdateTemplate*)descUpdateTemplate;
	_pipelineLayout = (MVKPipelineLayout*)layout;
	_set = set;
	if (_pData) delete[] (char*)_pData;
	// Work out how big the memory block in pData is.
	const VkDescriptorUpdateTemplateEntryKHR* pEntry =
		_descUpdateTemplate->getEntry(_descUpdateTemplate->getNumberOfEntries()-1);
	size_t size = pEntry->offset;
	// If we were given a stride, use that; otherwise, assume only one info
	// struct of the appropriate type.
	if (pEntry->stride)
		size += pEntry->stride * pEntry->descriptorCount;
	else switch (pEntry->descriptorType) {

		case VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC:
		case VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC:
		case VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER:
		case VK_DESCRIPTOR_TYPE_STORAGE_BUFFER:
			size += sizeof(VkDescriptorBufferInfo);
			break;

		case VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE:
		case VK_DESCRIPTOR_TYPE_STORAGE_IMAGE:
		case VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT:
		case VK_DESCRIPTOR_TYPE_SAMPLER:
		case VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER:
			size += sizeof(VkDescriptorImageInfo);
			break;

		case VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER:
		case VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER:
			size += sizeof(VkBufferView);
			break;

		default:
			break;
	}
	_pData = new char[size];
	memcpy(_pData, pData, size);

	// Validate by encoding on a null encoder
	encode(nullptr);
	return _pipelineLayout->getConfigurationResult();
}

void MVKCmdPushDescriptorSetWithTemplate::encode(MVKCommandEncoder* cmdEncoder) {
	_pipelineLayout->pushDescriptorSet(cmdEncoder, _descUpdateTemplate, _set, _pData);
}

MVKCmdPushDescriptorSetWithTemplate::~MVKCmdPushDescriptorSetWithTemplate() {
	if (_pData) delete[] (char*)_pData;
}


#pragma mark -
#pragma mark MVKCmdSetResetEvent

VkResult MVKCmdSetResetEvent::setContent(MVKCommandBuffer* cmdBuff,
										 VkEvent event,
										 VkPipelineStageFlags stageMask) {
	_mvkEvent = (MVKEvent*)event;

	return VK_SUCCESS;
}


#pragma mark -
#pragma mark MVKCmdSetEvent

void MVKCmdSetEvent::encode(MVKCommandEncoder* cmdEncoder) {
	cmdEncoder->signalEvent(_mvkEvent, true);
}


#pragma mark -
#pragma mark MVKCmdResetEvent

void MVKCmdResetEvent::encode(MVKCommandEncoder* cmdEncoder) {
	cmdEncoder->signalEvent(_mvkEvent, false);
}


#pragma mark -
#pragma mark MVKCmdWaitEvents

template <size_t N>
VkResult MVKCmdWaitEvents<N>::setContent(MVKCommandBuffer* cmdBuff,
										 uint32_t eventCount,
										 const VkEvent* pEvents,
										 VkPipelineStageFlags srcStageMask,
										 VkPipelineStageFlags dstStageMask,
										 uint32_t memoryBarrierCount,
										 const VkMemoryBarrier* pMemoryBarriers,
										 uint32_t bufferMemoryBarrierCount,
										 const VkBufferMemoryBarrier* pBufferMemoryBarriers,
										 uint32_t imageMemoryBarrierCount,
										 const VkImageMemoryBarrier* pImageMemoryBarriers) {
	_mvkEvents.clear();	// Clear for reuse
	_mvkEvents.reserve(eventCount);
	for (uint32_t i = 0; i < eventCount; i++) {
		_mvkEvents.push_back((MVKEvent*)pEvents[i]);
	}

	return VK_SUCCESS;
}

template <size_t N>
void MVKCmdWaitEvents<N>::encode(MVKCommandEncoder* cmdEncoder) {
	for (MVKEvent* mvkEvt : _mvkEvents) {
		mvkEvt->encodeWait(cmdEncoder->_mtlCmdBuffer);
	}
}

template class MVKCmdWaitEvents<1>;
template class MVKCmdWaitEvents<8>;