/****************************************************************************
 Copyright (c) 2019-2023 Xiamen Yaji Software Co., Ltd.

 http://www.cocos.com

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights to
 use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 of the Software, and to permit persons to whom the Software is furnished to do so,
 subject to the following conditions:

 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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 THE SOFTWARE.
****************************************************************************/

#include "GLES2Std.h"

#include "GLES2Buffer.h"
#include "GLES2CommandBuffer.h"
#include "GLES2Commands.h"
#include "GLES2DescriptorSet.h"
#include "GLES2Device.h"
#include "GLES2Framebuffer.h"
#include "GLES2InputAssembler.h"
#include "GLES2PipelineState.h"
#include "GLES2RenderPass.h"
#include "GLES2Texture.h"
#include "profiler/Profiler.h"

namespace cc {
namespace gfx {

GLES2CommandBuffer::GLES2CommandBuffer() {
    _typedID = generateObjectID<decltype(this)>();
}

GLES2CommandBuffer::~GLES2CommandBuffer() {
    destroy();
}

void GLES2CommandBuffer::doInit(const CommandBufferInfo &info) {
    _type = info.type;
    _queue = info.queue;

    _cmdAllocator = ccnew GLES2GPUCommandAllocator;
    _curCmdPackage = ccnew GLES2CmdPackage;

    size_t setCount = GLES2Device::getInstance()->bindingMappingInfo().setIndices.size();
    _curGPUDescriptorSets.resize(setCount);
    _curDynamicOffsets.resize(setCount);
}

void GLES2CommandBuffer::doDestroy() {
    if (!_cmdAllocator) return;

    _cmdAllocator->clearCmds(_curCmdPackage);
    CC_SAFE_DELETE(_curCmdPackage);

    while (!_pendingPackages.empty()) {
        GLES2CmdPackage *package = _pendingPackages.front();
        _cmdAllocator->clearCmds(package);
        CC_SAFE_DELETE(package);
        _pendingPackages.pop();
    }

    while (!_freePackages.empty()) {
        GLES2CmdPackage *package = _freePackages.front();
        _cmdAllocator->clearCmds(package);
        CC_SAFE_DELETE(package);
        _freePackages.pop();
    }

    _cmdAllocator->reset();
    CC_SAFE_DELETE(_cmdAllocator);
}

void GLES2CommandBuffer::begin(RenderPass * /*renderPass*/, uint32_t /*subpass*/, Framebuffer * /*frameBuffer*/) {
    _cmdAllocator->clearCmds(_curCmdPackage);
    _curGPUPipelineState = nullptr;
    _curGPUInputAssember = nullptr;
    _curGPUDescriptorSets.assign(_curGPUDescriptorSets.size(), nullptr);

    _numDrawCalls = 0;
    _numInstances = 0;
    _numTriangles = 0;
}

void GLES2CommandBuffer::end() {
    if (_isStateInvalid) {
        bindStates();
    }

    _pendingPackages.push(_curCmdPackage);
    if (!_freePackages.empty()) {
        _curCmdPackage = _freePackages.front();
        _freePackages.pop();
    } else {
        _curCmdPackage = ccnew GLES2CmdPackage;
    }
}

void GLES2CommandBuffer::beginRenderPass(RenderPass *renderPass, Framebuffer *fbo, const Rect &renderArea, const Color *colors, float depth, uint32_t stencil, CommandBuffer *const * /*secondaryCBs*/, uint32_t /*secondaryCBCount*/) {
    _curSubpassIdx = 0U;

    GLES2CmdBeginRenderPass *cmd = _cmdAllocator->beginRenderPassCmdPool.alloc();
    cmd->subpassIdx = _curSubpassIdx;
    cmd->gpuRenderPass = static_cast<GLES2RenderPass *>(renderPass)->gpuRenderPass();
    cmd->gpuFBO = static_cast<GLES2Framebuffer *>(fbo)->gpuFBO();
    cmd->renderArea = renderArea;
    size_t numClearColors = cmd->gpuRenderPass->colorAttachments.size();
    memcpy(cmd->clearColors, colors, numClearColors * sizeof(Color));
    cmd->clearDepth = depth;
    cmd->clearStencil = stencil;
    _curCmdPackage->beginRenderPassCmds.push(cmd);
    _curCmdPackage->cmds.push(GLESCmdType::BEGIN_RENDER_PASS);
    _curDynamicStates.viewport = {renderArea.x, renderArea.y, renderArea.width, renderArea.height};
    _curDynamicStates.scissor = renderArea;
}

void GLES2CommandBuffer::endRenderPass() {
    _curCmdPackage->cmds.push(GLESCmdType::END_RENDER_PASS);
}

void GLES2CommandBuffer::nextSubpass() {
    _curCmdPackage->cmds.push(GLESCmdType::END_RENDER_PASS);
    GLES2CmdBeginRenderPass *cmd = _cmdAllocator->beginRenderPassCmdPool.alloc();
    cmd->subpassIdx = ++_curSubpassIdx;
    _curCmdPackage->beginRenderPassCmds.push(cmd);
    _curCmdPackage->cmds.push(GLESCmdType::BEGIN_RENDER_PASS);
}

void GLES2CommandBuffer::insertMarker(const MarkerInfo &marker) {
    std::ignore = marker;
}
void GLES2CommandBuffer::beginMarker(const MarkerInfo &marker) {
    std::ignore = marker;
}
void GLES2CommandBuffer::endMarker() {
}

void GLES2CommandBuffer::bindPipelineState(PipelineState *pso) {
    GLES2GPUPipelineState *gpuPipelineState = static_cast<GLES2PipelineState *>(pso)->gpuPipelineState();
    if (_curGPUPipelineState != gpuPipelineState) {
        _curGPUPipelineState = gpuPipelineState;
        _isStateInvalid = true;
    }
}

void GLES2CommandBuffer::bindDescriptorSet(uint32_t set, DescriptorSet *descriptorSet, uint32_t dynamicOffsetCount, const uint32_t *dynamicOffsets) {
    CC_ASSERT(_curGPUDescriptorSets.size() > set);

    GLES2GPUDescriptorSet *gpuDescriptorSet = static_cast<GLES2DescriptorSet *>(descriptorSet)->gpuDescriptorSet();
    if (_curGPUDescriptorSets[set] != gpuDescriptorSet) {
        _curGPUDescriptorSets[set] = gpuDescriptorSet;
        _isStateInvalid = true;
    }
    if (dynamicOffsetCount) {
        _curDynamicOffsets[set].assign(dynamicOffsets, dynamicOffsets + dynamicOffsetCount);
        _isStateInvalid = true;
    } else if (!_curDynamicOffsets[set].empty()) {
        _curDynamicOffsets[set].assign(_curDynamicOffsets[set].size(), 0);
        _isStateInvalid = true;
    }
}

void GLES2CommandBuffer::bindInputAssembler(InputAssembler *ia) {
    _curGPUInputAssember = static_cast<GLES2InputAssembler *>(ia)->gpuInputAssembler();
    _isStateInvalid = true;
}

void GLES2CommandBuffer::setViewport(const Viewport &vp) {
    if ((_curDynamicStates.viewport.left != vp.left) ||
        (_curDynamicStates.viewport.top != vp.top) ||
        (_curDynamicStates.viewport.width != vp.width) ||
        (_curDynamicStates.viewport.height != vp.height) ||
        math::isNotEqualF(_curDynamicStates.viewport.minDepth, vp.minDepth) ||
        math::isNotEqualF(_curDynamicStates.viewport.maxDepth, vp.maxDepth)) {
        _curDynamicStates.viewport = vp;
        _isStateInvalid = true;
    }
}

void GLES2CommandBuffer::setScissor(const Rect &rect) {
    if ((_curDynamicStates.scissor.x != rect.x) ||
        (_curDynamicStates.scissor.y != rect.y) ||
        (_curDynamicStates.scissor.width != rect.width) ||
        (_curDynamicStates.scissor.height != rect.height)) {
        _curDynamicStates.scissor = rect;
        _isStateInvalid = true;
    }
}

void GLES2CommandBuffer::setLineWidth(float width) {
    if (math::isNotEqualF(_curDynamicStates.lineWidth, width)) {
        _curDynamicStates.lineWidth = width;
        _isStateInvalid = true;
    }
}

void GLES2CommandBuffer::setDepthBias(float constant, float clamp, float slope) {
    if (math::isNotEqualF(_curDynamicStates.depthBiasConstant, constant) ||
        math::isNotEqualF(_curDynamicStates.depthBiasClamp, clamp) ||
        math::isNotEqualF(_curDynamicStates.depthBiasSlope, slope)) {
        _curDynamicStates.depthBiasConstant = constant;
        _curDynamicStates.depthBiasClamp = clamp;
        _curDynamicStates.depthBiasSlope = slope;
        _isStateInvalid = true;
    }
}

void GLES2CommandBuffer::setBlendConstants(const Color &constants) {
    if (math::isNotEqualF(_curDynamicStates.blendConstant.x, constants.x) ||
        math::isNotEqualF(_curDynamicStates.blendConstant.y, constants.y) ||
        math::isNotEqualF(_curDynamicStates.blendConstant.z, constants.z) ||
        math::isNotEqualF(_curDynamicStates.blendConstant.w, constants.w)) {
        _curDynamicStates.blendConstant.x = constants.x;
        _curDynamicStates.blendConstant.y = constants.y;
        _curDynamicStates.blendConstant.z = constants.z;
        _curDynamicStates.blendConstant.w = constants.w;
        _isStateInvalid = true;
    }
}

void GLES2CommandBuffer::setDepthBound(float minBounds, float maxBounds) {
    if (math::isNotEqualF(_curDynamicStates.depthMinBounds, minBounds) ||
        math::isNotEqualF(_curDynamicStates.depthMaxBounds, maxBounds)) {
        _curDynamicStates.depthMinBounds = minBounds;
        _curDynamicStates.depthMaxBounds = maxBounds;
        _isStateInvalid = true;
    }
}

void GLES2CommandBuffer::setStencilWriteMask(StencilFace face, uint32_t mask) {
    auto update = [&](DynamicStencilStates &stencilState) {
        if (stencilState.writeMask != mask) {
            stencilState.writeMask = mask;
            _isStateInvalid = true;
        }
    };
    if (hasFlag(face, StencilFace::FRONT)) update(_curDynamicStates.stencilStatesFront);
    if (hasFlag(face, StencilFace::BACK)) update(_curDynamicStates.stencilStatesBack);
}

void GLES2CommandBuffer::setStencilCompareMask(StencilFace face, uint32_t ref, uint32_t mask) {
    auto update = [&](DynamicStencilStates &stencilState) {
        if ((stencilState.reference != ref) ||
            (stencilState.compareMask != mask)) {
            stencilState.reference = ref;
            stencilState.compareMask = mask;
            _isStateInvalid = true;
        }
    };
    if (hasFlag(face, StencilFace::FRONT)) update(_curDynamicStates.stencilStatesFront);
    if (hasFlag(face, StencilFace::BACK)) update(_curDynamicStates.stencilStatesBack);
}

void GLES2CommandBuffer::draw(const DrawInfo &info) {
    CC_PROFILE(GLES2CommandBufferDraw);
    if (_isStateInvalid) {
        bindStates();
    }

    GLES2CmdDraw *cmd = _cmdAllocator->drawCmdPool.alloc();
    cmd->drawInfo = info;
    _curCmdPackage->drawCmds.push(cmd);
    _curCmdPackage->cmds.push(GLESCmdType::DRAW);

    ++_numDrawCalls;
    _numInstances += info.instanceCount;
    uint32_t indexCount = info.indexCount ? info.indexCount : info.vertexCount;
    if (_curGPUPipelineState) {
        switch (_curGPUPipelineState->glPrimitive) {
            case GL_TRIANGLES: {
                _numTriangles += indexCount / 3 * std::max(info.instanceCount, 1U);
                break;
            }
            case GL_TRIANGLE_STRIP:
            case GL_TRIANGLE_FAN: {
                _numTriangles += (indexCount - 2) * std::max(info.instanceCount, 1U);
                break;
            }
            default:
                break;
        }
    }
}

void GLES2CommandBuffer::updateBuffer(Buffer *buff, const void *data, uint32_t size) {
    GLES2GPUBuffer *gpuBuffer = static_cast<GLES2Buffer *>(buff)->gpuBuffer();
    if (gpuBuffer) {
        GLES2CmdUpdateBuffer *cmd = _cmdAllocator->updateBufferCmdPool.alloc();
        cmd->gpuBuffer = gpuBuffer;
        cmd->size = size;
        cmd->buffer = static_cast<const uint8_t *>(data);

        _curCmdPackage->updateBufferCmds.push(cmd);
        _curCmdPackage->cmds.push(GLESCmdType::UPDATE_BUFFER);
    }
}

void GLES2CommandBuffer::copyBuffersToTexture(const uint8_t *const *buffers, Texture *texture, const BufferTextureCopy *regions, uint32_t count) {
    GLES2GPUTexture *gpuTexture = static_cast<GLES2Texture *>(texture)->gpuTexture();
    if (gpuTexture) {
        GLES2CmdCopyBufferToTexture *cmd = _cmdAllocator->copyBufferToTextureCmdPool.alloc();
        cmd->gpuTexture = gpuTexture;
        cmd->regions = regions;
        cmd->count = count;
        cmd->buffers = buffers;

        _curCmdPackage->copyBufferToTextureCmds.push(cmd);
        _curCmdPackage->cmds.push(GLESCmdType::COPY_BUFFER_TO_TEXTURE);
    }
}

void GLES2CommandBuffer::copyTexture(Texture *srcTexture, Texture *dstTexture, const TextureCopy *regions, uint32_t count) {
    // should not copy texture in a secondary command buffer
}

void GLES2CommandBuffer::resolveTexture(Texture *srcTexture, Texture *dstTexture, const TextureCopy *regions, uint32_t count) {
    // should not copy texture in a secondary command buffer
}

void GLES2CommandBuffer::blitTexture(Texture *srcTexture, Texture *dstTexture, const TextureBlit *regions, uint32_t count, Filter filter) {
    GLES2CmdBlitTexture *cmd = _cmdAllocator->blitTextureCmdPool.alloc();
    if (srcTexture) cmd->gpuTextureSrc = static_cast<GLES2Texture *>(srcTexture)->gpuTexture();
    if (dstTexture) cmd->gpuTextureDst = static_cast<GLES2Texture *>(dstTexture)->gpuTexture();
    cmd->regions = regions;
    cmd->count = count;
    cmd->filter = filter;

    ++_numDrawCalls; // blit is also seen as draw call in GLES2

    _curCmdPackage->blitTextureCmds.push(cmd);
    _curCmdPackage->cmds.push(GLESCmdType::BLIT_TEXTURE);
}

void GLES2CommandBuffer::execute(CommandBuffer *const *cmdBuffs, uint32_t count) {
    CC_ABORT(); // Command 'execute' must be recorded in primary command buffers.

    for (uint32_t i = 0; i < count; ++i) {
        auto *cmdBuff = static_cast<GLES2CommandBuffer *>(cmdBuffs[i]);
        GLES2CmdPackage *cmdPackage = cmdBuff->_pendingPackages.front();

        for (uint32_t j = 0; j < cmdPackage->beginRenderPassCmds.size(); ++j) {
            GLES2CmdBeginRenderPass *cmd = cmdPackage->beginRenderPassCmds[j];
            ++cmd->refCount;
            _curCmdPackage->beginRenderPassCmds.push(cmd);
        }
        for (uint32_t j = 0; j < cmdPackage->bindStatesCmds.size(); ++j) {
            GLES2CmdBindStates *cmd = cmdPackage->bindStatesCmds[j];
            ++cmd->refCount;
            _curCmdPackage->bindStatesCmds.push(cmd);
        }
        for (uint32_t j = 0; j < cmdPackage->drawCmds.size(); ++j) {
            GLES2CmdDraw *cmd = cmdPackage->drawCmds[j];
            ++cmd->refCount;
            _curCmdPackage->drawCmds.push(cmd);
        }
        for (uint32_t j = 0; j < cmdPackage->updateBufferCmds.size(); ++j) {
            GLES2CmdUpdateBuffer *cmd = cmdPackage->updateBufferCmds[j];
            ++cmd->refCount;
            _curCmdPackage->updateBufferCmds.push(cmd);
        }
        for (uint32_t j = 0; j < cmdPackage->copyBufferToTextureCmds.size(); ++j) {
            GLES2CmdCopyBufferToTexture *cmd = cmdPackage->copyBufferToTextureCmds[j];
            ++cmd->refCount;
            _curCmdPackage->copyBufferToTextureCmds.push(cmd);
        }
        for (uint32_t j = 0; j < cmdPackage->blitTextureCmds.size(); ++j) {
            GLES2CmdBlitTexture *cmd = cmdPackage->blitTextureCmds[j];
            ++cmd->refCount;
            _curCmdPackage->blitTextureCmds.push(cmd);
        }
        _curCmdPackage->cmds.concat(cmdPackage->cmds);

        _numDrawCalls += cmdBuff->_numDrawCalls;
        _numInstances += cmdBuff->_numInstances;
        _numTriangles += cmdBuff->_numTriangles;

        cmdBuff->_pendingPackages.pop();
        cmdBuff->_freePackages.push(cmdPackage);

        // current cmd allocator strategy will not work here: (but it doesn't matter anyways)
        // allocators are designed to only free the cmds they allocated
        // but here we are essentially ��transfering' the owner ship
        // cmdBuff->_cmdAllocator->clearCmds(cmdPackage);
    }
}

void GLES2CommandBuffer::bindStates() {
    GLES2CmdBindStates *cmd = _cmdAllocator->bindStatesCmdPool.alloc();

    cmd->gpuPipelineState = _curGPUPipelineState;
    cmd->gpuInputAssembler = _curGPUInputAssember;
    cmd->gpuDescriptorSets = _curGPUDescriptorSets;

    if (_curGPUPipelineState) {
        ccstd::vector<uint32_t> &dynamicOffsetOffsets = _curGPUPipelineState->gpuPipelineLayout->dynamicOffsetOffsets;
        cmd->dynamicOffsets.resize(_curGPUPipelineState->gpuPipelineLayout->dynamicOffsetCount);
        for (size_t i = 0U; i < _curDynamicOffsets.size(); i++) {
            size_t count = dynamicOffsetOffsets[i + 1] - dynamicOffsetOffsets[i];
            // CC_ASSERT(_curDynamicOffsets[i].size() >= count);
            count = std::min(count, _curDynamicOffsets[i].size());
            if (count) memcpy(&cmd->dynamicOffsets[dynamicOffsetOffsets[i]], _curDynamicOffsets[i].data(), count * sizeof(uint32_t));
        }
    }
    cmd->dynamicStates = _curDynamicStates;

    _curCmdPackage->bindStatesCmds.push(cmd);
    _curCmdPackage->cmds.push(GLESCmdType::BIND_STATES);
    _isStateInvalid = false;
}

} // namespace gfx
} // namespace cc