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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 of this software and associated documentation files (the "Software"), to deal
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 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,
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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 programType = _pipelineDescriptor.programState->getProgram()->getProgramType();
    auto uniformID   = _pipelineDescriptor.programState->hashOfUniforms();
    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_AX_END