axmol/cocos/renderer/CCTrianglesCommand.cpp

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

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#include "renderer/CCTrianglesCommand.h"
#include "xxhash.h"
#include "renderer/CCRenderer.h"
#include "renderer/CCTexture2D.h"
#include "base//ccUtils.h"

NS_CC_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;
        CCLOGERROR("Resize indexCount from %d to %d, size must be multiple times of 3", count, _triangles.indexCount);
    }
    _mv = mv;

    auto programType = _pipelineDescriptor.programState->getProgram()->getProgramType();
    auto uniformID   = _pipelineDescriptor.programState->getUniformID();
    if (_programType != programType || _texture != texture->getBackendTexture() || _blendType != blendType ||
        _uniformID != uniformID)
    {
        _programType = programType;
        _texture     = texture->getBackendTexture();
        _blendType   = blendType;
        _uniformID   = uniformID;

        // since it would be too expensive to check the uniforms, simplify enable batching for built-in program.
        if (_programType == backend::ProgramType::CUSTOM_PROGRAM)
            setSkipBatching(true);

        // 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 (!isSkipBatching())
            generateMaterialID();
    }
}

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

TrianglesCommand::~TrianglesCommand() {}

void TrianglesCommand::generateMaterialID()
{
    struct
    {
        void* texture;
        uint32_t programType;
        uint32_t uniformID;
        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.programType = _programType;
    hashMe.uniformID   = _uniformID;
    _materialID        = XXH32((const void*)&hashMe, sizeof(hashMe), 0);
}

NS_CC_END