axmol/core/renderer/TrianglesCommand.cpp

/****************************************************************************
 Copyright (c) 2013-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

 https://axmolengine.github.io/

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

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#include "renderer/TrianglesCommand.h"
#include "xxhash.h"
#include "renderer/Renderer.h"
#include "renderer/Texture2D.h"
#include "base//Utils.h"

NS_AX_BEGIN

TrianglesCommand::TrianglesCommand()
{
    _type = RenderCommand::Type::TRIANGLES_COMMAND;
}

void TrianglesCommand::init(float globalOrder,
                            Texture2D* texture,
                            const BlendFunc& blendType,
                            const Triangles& triangles,
                            const Mat4& mv,
                            uint32_t flags)
{
    RenderCommand::init(globalOrder, mv, flags);

    _triangles = triangles;
    if (_triangles.indexCount % 3 != 0)
    {
        unsigned int count    = _triangles.indexCount;
        _triangles.indexCount = count / 3 * 3;
        AXLOGERROR("Resize indexCount from %d to %d, size must be multiple times of 3", count, _triangles.indexCount);
    }
    _mv = mv;

    auto batchId = _pipelineDescriptor.programState->getBatchId();
    if (_batchId != batchId || _texture != texture->getBackendTexture() || _blendType != blendType)
    {
        _batchId   = batchId;
        _texture   = texture->getBackendTexture();
        _blendType = blendType;

        // TODO: minggo set it in Node?
        auto& blendDescriptor                = _pipelineDescriptor.blendDescriptor;
        blendDescriptor.blendEnabled         = true;
        blendDescriptor.sourceRGBBlendFactor = blendDescriptor.sourceAlphaBlendFactor = blendType.src;
        blendDescriptor.destinationRGBBlendFactor = blendDescriptor.destinationAlphaBlendFactor = blendType.dst;

        if (_batchId == -1)
            setSkipBatching(true);

        if (!isSkipBatching())
            generateMaterialID();
    }
}

void TrianglesCommand::updateMaterialID()
{
    setSkipBatching(false);
    generateMaterialID();
}

TrianglesCommand::~TrianglesCommand() {}

void TrianglesCommand::generateMaterialID()
{
    struct
    {
        void* texture;
        uint64_t batchId;
        backend::BlendFactor src;
        backend::BlendFactor dst;
    } hashMe;

    // NOTE: Initialize hashMe struct to make the value of padding bytes be filled with zero.
    // It's important since XXH32 below will also consider the padding bytes which probably
    // are set to random values by different compilers.
    memset(&hashMe, 0, sizeof(hashMe));

    hashMe.texture = _texture;
    hashMe.src     = _blendType.src;
    hashMe.dst     = _blendType.dst;
    hashMe.batchId = _batchId;
    _materialID    = XXH32((const void*)&hashMe, sizeof(hashMe), 0);
}

NS_AX_END