RedCore/cocos2d/cocos/renderer/CCMeshCommand.cpp

/****************************************************************************
 Copyright (c) 2013-2017 Chukong Technologies Inc.

 http://www.cocos2d-x.org

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 of this software and associated documentation files (the "Software"), to deal
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 all copies or substantial portions of the Software.

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 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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 THE SOFTWARE.
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#include "renderer/CCMeshCommand.h"
#include "base/ccMacros.h"
#include "base/CCConfiguration.h"
#include "base/CCDirector.h"
#include "base/CCEventCustom.h"
#include "base/CCEventListenerCustom.h"
#include "base/CCEventDispatcher.h"
#include "base/CCEventType.h"
#include "2d/CCLight.h"
#include "renderer/ccGLStateCache.h"
#include "renderer/CCGLProgramState.h"
#include "renderer/CCRenderer.h"
#include "renderer/CCTextureAtlas.h"
#include "renderer/CCTexture2D.h"
#include "renderer/CCTechnique.h"
#include "renderer/CCMaterial.h"
#include "renderer/CCPass.h"
#include "xxhash.h"

NS_CC_BEGIN


MeshCommand::MeshCommand()
: _displayColor(1.0f, 1.0f, 1.0f, 1.0f)
, _matrixPalette(nullptr)
, _matrixPaletteSize(0)
, _materialID(0)
, _vao(0)
, _material(nullptr)
, _glProgramState(nullptr)
, _stateBlock(nullptr)
, _textureID(0)
{
    _type = RenderCommand::Type::MESH_COMMAND;

#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID || CC_TARGET_PLATFORM == CC_PLATFORM_WINRT)
    // listen the event that renderer was recreated on Android/WP8
    _rendererRecreatedListener = EventListenerCustom::create(EVENT_RENDERER_RECREATED, CC_CALLBACK_1(MeshCommand::listenRendererRecreated, this));
    Director::getInstance()->getEventDispatcher()->addEventListenerWithFixedPriority(_rendererRecreatedListener, -1);
#endif
}

void MeshCommand::init(float globalZOrder,
                       Material* material,
                       GLuint vertexBuffer,
                       GLuint indexBuffer,
                       GLenum primitive,
                       GLenum indexFormat,
                       ssize_t indexCount,
                       const cocos2d::Mat4 &mv,
                       uint32_t flags)
{
    CCASSERT(material, "material cannot be null");

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

    _globalOrder = globalZOrder;
    _material = material;
    
    _vertexBuffer = vertexBuffer;
    _indexBuffer = indexBuffer;
    _primitive = primitive;
    _indexFormat = indexFormat;
    _indexCount = indexCount;
    _mv.set(mv);

    _is3D = true;
}

void MeshCommand::init(float globalZOrder,
                       GLuint textureID,
                       GLProgramState* glProgramState,
                       RenderState::StateBlock* stateBlock,
                       GLuint vertexBuffer,
                       GLuint indexBuffer,
                       GLenum primitive,
                       GLenum indexFormat,
                       ssize_t indexCount,
                       const cocos2d::Mat4& mv,
                       uint32_t flags)
{
    CCASSERT(glProgramState, "GLProgramState cannot be null");
    CCASSERT(stateBlock, "StateBlock cannot be null");
    CCASSERT(!_material, "cannot init with GLProgramState if previously inited without GLProgramState");

    RenderCommand::init(globalZOrder, mv, flags);
    
    _globalOrder = globalZOrder;
    _textureID = textureID;

    // weak ref
    _glProgramState = glProgramState;
    _stateBlock = stateBlock;
    
    _vertexBuffer = vertexBuffer;
    _indexBuffer = indexBuffer;
    _primitive = primitive;
    _indexFormat = indexFormat;
    _indexCount = indexCount;
    _mv.set(mv);
    
    _is3D = true;

}


void MeshCommand::setDisplayColor(const Vec4& color)
{
    CCASSERT(!_material, "If using material, you should set the color as a uniform: use u_color");

    _displayColor = color;
}

void MeshCommand::setMatrixPalette(const Vec4* matrixPalette)
{
    CCASSERT(!_material, "If using material, you should set the color as a uniform: use u_matrixPalette");

    _matrixPalette = matrixPalette;
}

void MeshCommand::setMatrixPaletteSize(int size)
{
    CCASSERT(!_material, "If using material, you should set the color as a uniform: use u_matrixPalette with its size");

    _matrixPaletteSize = size;
}

MeshCommand::~MeshCommand()
{
    releaseVAO();
#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID || CC_TARGET_PLATFORM == CC_PLATFORM_WINRT)
    Director::getInstance()->getEventDispatcher()->removeEventListener(_rendererRecreatedListener);
#endif
}

void MeshCommand::applyRenderState()
{
    CCASSERT(!_material, "Must not be called when using materials");
    CCASSERT(_stateBlock, "StateBlock must be non null");

    // blend and texture
    GL::bindTexture2D(_textureID);

    _stateBlock->bind();
}

void MeshCommand::genMaterialID(GLuint texID, void* glProgramState, GLuint vertexBuffer, GLuint indexBuffer, BlendFunc blend)
{
    int intArray[7] = {0};
    intArray[0] = (int)texID;
    *(int**)&intArray[1] = (int*) glProgramState;
    intArray[3] = (int) vertexBuffer;
    intArray[4] = (int) indexBuffer;
    intArray[5] = (int) blend.src;
    intArray[6] = (int) blend.dst;
    _materialID = XXH32((const void*)intArray, sizeof(intArray), 0);
}

uint32_t MeshCommand::getMaterialID() const
{
    return _materialID;
}

void MeshCommand::preBatchDraw()
{
    // Do nothing if using material since each pass needs to bind its own VAO
    if (!_material)
    {
        if (Configuration::getInstance()->supportsShareableVAO() && _vao == 0)
            buildVAO();
        if (_vao)
        {
            GL::bindVAO(_vao);
        }
        else
        {
            glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer);

            // FIXME: Assumes that all the passes in the Material share the same Vertex Attribs
            GLProgramState* programState = _material
                                            ? _material->_currentTechnique->_passes.at(0)->getGLProgramState()
                                            : _glProgramState;
            programState->applyAttributes();
            glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _indexBuffer);
        }
    }
}

void MeshCommand::batchDraw()
{
    if (_material)
    {
        for(const auto& pass: _material->_currentTechnique->_passes)
        {
            pass->bind(_mv);

            glDrawElements(_primitive, (GLsizei)_indexCount, _indexFormat, 0);
            CC_INCREMENT_GL_DRAWN_BATCHES_AND_VERTICES(1, _indexCount);

            pass->unbind();
        }
    }
    else
    {
        _glProgramState->applyGLProgram(_mv);

        // set render state
        applyRenderState();

        // Draw
        glDrawElements(_primitive, (GLsizei)_indexCount, _indexFormat, 0);
        CC_INCREMENT_GL_DRAWN_BATCHES_AND_VERTICES(1, _indexCount);
    }
}
void MeshCommand::postBatchDraw()
{
    // when using material, unbind is after draw
    if (!_material)
    {
        if (_vao)
        {
            GL::bindVAO(0);
        }
        else
        {
            glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
            glBindBuffer(GL_ARRAY_BUFFER, 0);
        }

        // restore the default state since we don't know
        // if the next command will need the default state or not
        RenderState::StateBlock::restore(0);
    }
}

void MeshCommand::execute()
{
    // Draw without VAO
    glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer);
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _indexBuffer);

    if (_material)
    {
        for(const auto& pass: _material->_currentTechnique->_passes)
        {
            pass->bind(_mv, true);

            glDrawElements(_primitive, (GLsizei)_indexCount, _indexFormat, 0);
            CC_INCREMENT_GL_DRAWN_BATCHES_AND_VERTICES(1, _indexCount);

            pass->unbind();
        }
    }
    else
    {
        // set render state
        _glProgramState->apply(_mv);

        applyRenderState();

        // Draw
        glDrawElements(_primitive, (GLsizei)_indexCount, _indexFormat, 0);
        
        CC_INCREMENT_GL_DRAWN_BATCHES_AND_VERTICES(1, _indexCount);
    }

    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
    glBindBuffer(GL_ARRAY_BUFFER, 0);
}

void MeshCommand::buildVAO()
{
    // FIXME: Assumes that all the passes in the Material share the same Vertex Attribs
    GLProgramState* programState = (_material != nullptr)
                                    ? _material->_currentTechnique->_passes.at(0)->getGLProgramState()
                                    : _glProgramState;

    releaseVAO();
    glGenVertexArrays(1, &_vao);
    GL::bindVAO(_vao);
    glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer);
    auto flags = programState->getVertexAttribsFlags();
    for (int i = 0; flags > 0; i++) {
        int flag = 1 << i;
        if (flag & flags)
            glEnableVertexAttribArray(i);
        flags &= ~flag;
    }
    programState->applyAttributes(false);
    
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _indexBuffer);
    
    GL::bindVAO(0);
    glBindBuffer(GL_ARRAY_BUFFER, 0);
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
}
void MeshCommand::releaseVAO()
{
    if (_vao)
    {
        glDeleteVertexArrays(1, &_vao);
        _vao = 0;
        GL::bindVAO(0);
    }
}

#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID || CC_TARGET_PLATFORM == CC_PLATFORM_WINRT)
void MeshCommand::listenRendererRecreated(EventCustom* event)
{
    _vao = 0;
}

#endif

NS_CC_END