India/cocos2d-x/cocos/renderer/CCTrianglesCommand.cpp

/****************************************************************************
 Copyright (c) 2013-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
 
 http://www.cocos2d-x.org
 
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 all copies or substantial portions of the Software.
 
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#include "renderer/CCTrianglesCommand.h"
#include "renderer/ccGLStateCache.h"
#include "renderer/CCGLProgram.h"
#include "renderer/CCGLProgramState.h"
#include "xxhash.h"
#include "renderer/CCRenderer.h"
#include "renderer/CCTexture2D.h"

NS_CC_BEGIN

TrianglesCommand::TrianglesCommand()
:_materialID(0)
,_textureID(0)
,_glProgramState(nullptr)
,_blendType(BlendFunc::DISABLE)
,_alphaTextureID(0)
{
    _type = RenderCommand::Type::TRIANGLES_COMMAND;
}

void TrianglesCommand::init(float globalOrder, GLuint textureID, GLProgramState* glProgramState, BlendFunc blendType, const Triangles& triangles,const Mat4& mv, uint32_t flags)
{
    CCASSERT(glProgramState, "Invalid GLProgramState");
    CCASSERT(glProgramState->getVertexAttribsFlags() == 0, "No custom attributes are supported in QuadCommand");

    RenderCommand::init(globalOrder, mv, flags);

    _triangles = triangles;
    if(_triangles.indexCount % 3 != 0)
    {
        int count = _triangles.indexCount;
        _triangles.indexCount = count / 3 * 3;
        CCLOGERROR("Resize indexCount from %zd to %zd, size must be multiple times of 3", count, _triangles.indexCount);
    }
    _mv = mv;
    
    if( _textureID != textureID || _blendType.src != blendType.src || _blendType.dst != blendType.dst ||
       _glProgramState != glProgramState)
    {
        _textureID = textureID;
        _blendType = blendType;
        _glProgramState = glProgramState;

        generateMaterialID();
    }
}

void TrianglesCommand::init(float globalOrder, GLuint textureID, GLProgramState* glProgramState, BlendFunc blendType, const Triangles& triangles,const Mat4& mv)
{
    init(globalOrder, textureID, glProgramState, blendType, triangles, mv, 0);
}

void TrianglesCommand::init(float globalOrder, Texture2D* texture, GLProgramState* glProgramState, BlendFunc blendType, const Triangles& triangles, const Mat4& mv, uint32_t flags)
{
    init(globalOrder, texture->getName(), glProgramState, blendType, triangles, mv, flags);
    _alphaTextureID = texture->getAlphaTextureName();
}

TrianglesCommand::~TrianglesCommand()
{
}

void TrianglesCommand::generateMaterialID()
{
    // glProgramState is hashed because it contains:
    //  *  uniforms/values
    //  *  glProgram
    //
    // we safely can when the same glProgramState is being used then they share those states
    // if they don't have the same glProgramState, they might still have the same
    // uniforms/values and glProgram, but it would be too expensive to check the uniforms.
    struct {
        void* glProgramState;
        GLuint textureId;
        GLenum blendSrc;
        GLenum blendDst;
    } 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.textureId = _textureID;
    hashMe.blendSrc = _blendType.src;
    hashMe.blendDst = _blendType.dst;
    hashMe.glProgramState = _glProgramState;
    _materialID = XXH32((const void*)&hashMe, sizeof(hashMe), 0);
}

void TrianglesCommand::useMaterial() const
{
    //Set texture
    GL::bindTexture2D(_textureID);
    
    if (_alphaTextureID > 0)
    { // ANDROID ETC1 ALPHA supports.
        GL::bindTexture2DN(1, _alphaTextureID);
    }
    //set blend mode
    GL::blendFunc(_blendType.src, _blendType.dst);
    
    _glProgramState->apply(_mv);
}

NS_CC_END