CCTextureAtlas.cpp

/****************************************************************************
Copyright (c) 2008-2010 Ricardo Quesada
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2011      Zynga Inc.
Copyright (c) 2013-2016 Chukong Technologies Inc.
Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

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****************************************************************************/

#include "renderer/CCTextureAtlas.h"

#include <stdlib.h>

#include "base/ccMacros.h"
#include "base/ccUTF8.h"
#include "base/CCEventType.h"
#include "base/CCDirector.h"
#include "base/CCConfiguration.h"
#include "base/CCEventDispatcher.h"
#include "base/CCEventListenerCustom.h"
#include "renderer/CCTextureCache.h"
#include "renderer/CCGLProgram.h"
#include "renderer/CCRenderer.h"
#include "renderer/CCTexture2D.h"
#include "platform/CCGL.h"

//According to some tests GL_TRIANGLE_STRIP is slower, MUCH slower. Probably I'm doing something very wrong

// implementation TextureAtlas

NS_CC_BEGIN

TextureAtlas::TextureAtlas()
    :_indices(nullptr)
    ,_dirty(false)
    ,_texture(nullptr)
    ,_quads(nullptr)
#if CC_ENABLE_CACHE_TEXTURE_DATA
    ,_rendererRecreatedListener(nullptr)
#endif
{}

TextureAtlas::~TextureAtlas()
{
    CCLOGINFO("deallocing TextureAtlas: %p", this);

    CC_SAFE_FREE(_quads);
    CC_SAFE_FREE(_indices);

    glDeleteBuffers(2, _buffersVBO);

    if (Configuration::getInstance()->supportsShareableVAO())
    {
        glDeleteVertexArrays(1, &_VAOname);
        glBindVertexArray(0);
    }
    CC_SAFE_RELEASE(_texture);
    
#if CC_ENABLE_CACHE_TEXTURE_DATA
    Director::getInstance()->getEventDispatcher()->removeEventListener(_rendererRecreatedListener);
#endif
}

ssize_t TextureAtlas::getTotalQuads() const
{
    return _totalQuads;
}

ssize_t TextureAtlas::getCapacity() const
{
    return _capacity;
}

Texture2D* TextureAtlas::getTexture() const
{
    return _texture;
}

void TextureAtlas::setTexture(Texture2D * var)
{
    CC_SAFE_RETAIN(var);
    CC_SAFE_RELEASE(_texture);
    _texture = var;
}

V3F_C4B_T2F_Quad* TextureAtlas::getQuads()
{
    //if someone accesses the quads directly, presume that changes will be made
    _dirty = true;
    return _quads;
}

void TextureAtlas::setQuads(V3F_C4B_T2F_Quad* quads)
{
    _quads = quads;
}

// TextureAtlas - alloc & init

TextureAtlas * TextureAtlas::create(const std::string& file, ssize_t capacity)
{
    TextureAtlas * textureAtlas = new (std::nothrow) TextureAtlas();
    if(textureAtlas && textureAtlas->initWithFile(file, capacity))
    {
        textureAtlas->autorelease();
        return textureAtlas;
    }
    CC_SAFE_DELETE(textureAtlas);
    return nullptr;
}

TextureAtlas * TextureAtlas::createWithTexture(Texture2D *texture, ssize_t capacity)
{
    TextureAtlas * textureAtlas = new (std::nothrow) TextureAtlas();
    if (textureAtlas && textureAtlas->initWithTexture(texture, capacity))
    {
        textureAtlas->autorelease();
        return textureAtlas;
    }
    CC_SAFE_DELETE(textureAtlas);
    return nullptr;
}

bool TextureAtlas::initWithFile(const std::string& file, ssize_t capacity)
{
    // retained in property
    Texture2D *texture = Director::getInstance()->getTextureCache()->addImage(file);

    if (texture)
    {   
        return initWithTexture(texture, capacity);
    }
    else
    {
        CCLOG("cocos2d: Could not open file: %s", file.c_str());
        return false;
    }
}

bool TextureAtlas::initWithTexture(Texture2D *texture, ssize_t capacity)
{
    CCASSERT(capacity>=0, "Capacity must be >= 0");
    
//    CCASSERT(texture != nullptr, "texture should not be null");
    _capacity = capacity;
    _totalQuads = 0;

    // retained in property
    this->_texture = texture;
    CC_SAFE_RETAIN(_texture);

    // Re-initialization is not allowed
    CCASSERT(_quads == nullptr && _indices == nullptr, "_quads and _indices should be nullptr.");

    _quads = (V3F_C4B_T2F_Quad*)malloc( _capacity * sizeof(V3F_C4B_T2F_Quad) );
    _indices = (GLushort *)malloc( _capacity * 6 * sizeof(GLushort) );
    
    if( ! ( _quads && _indices) && _capacity > 0) 
    {
        //CCLOG("cocos2d: TextureAtlas: not enough memory");
        CC_SAFE_FREE(_quads);
        CC_SAFE_FREE(_indices);

        // release texture, should set it to null, because the destruction will
        // release it too. see cocos2d-x issue #484
        CC_SAFE_RELEASE_NULL(_texture);
        return false;
    }

    memset( _quads, 0, _capacity * sizeof(V3F_C4B_T2F_Quad) );
    memset( _indices, 0, _capacity * 6 * sizeof(GLushort) );
    
#if CC_ENABLE_CACHE_TEXTURE_DATA
    /** listen the event that renderer was recreated on Android/WP8 */
    _rendererRecreatedListener = EventListenerCustom::create(EVENT_RENDERER_RECREATED, CC_CALLBACK_1(TextureAtlas::listenRendererRecreated, this));
    Director::getInstance()->getEventDispatcher()->addEventListenerWithFixedPriority(_rendererRecreatedListener, -1);
#endif
    
    this->setupIndices();

    if (Configuration::getInstance()->supportsShareableVAO())
    {
        setupVBOandVAO();
    }
    else
    {
        setupVBO();
    }

    _dirty = true;

    return true;
}

void TextureAtlas::listenRendererRecreated(EventCustom* /*event*/)
{  
    if (Configuration::getInstance()->supportsShareableVAO())
    {
        setupVBOandVAO();
    }
    else
    {
        setupVBO();
    }
    
    // set _dirty to true to force it rebinding buffer
    _dirty = true;
}

std::string TextureAtlas::getDescription() const
{
    return StringUtils::format("<TextureAtlas | totalQuads = %d>", static_cast<int>(_totalQuads));
}


void TextureAtlas::setupIndices()
{
    if (_capacity == 0)
        return;

    for( int i=0; i < _capacity; i++)
    {
        _indices[i*6+0] = i*4+0;
        _indices[i*6+1] = i*4+1;
        _indices[i*6+2] = i*4+2;

        // inverted index. issue #179
        _indices[i*6+3] = i*4+3;
        _indices[i*6+4] = i*4+2;
        _indices[i*6+5] = i*4+1;        
    }
}

//TextureAtlas - VAO / VBO specific

void TextureAtlas::setupVBOandVAO()
{
    glGenVertexArrays(1, &_VAOname);
    glBindVertexArray(_VAOname);

#define kQuadSize sizeof(_quads[0].bl)

    glGenBuffers(2, &_buffersVBO[0]);

    glBindBuffer(GL_ARRAY_BUFFER, _buffersVBO[0]);
    glBufferData(GL_ARRAY_BUFFER, sizeof(_quads[0]) * _capacity, _quads, GL_DYNAMIC_DRAW);

    // vertices
    glEnableVertexAttribArray(GLProgram::VERTEX_ATTRIB_POSITION);
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 3, GL_FLOAT, GL_FALSE, kQuadSize, (GLvoid*) offsetof( V3F_C4B_T2F, vertices));

    // colors
    glEnableVertexAttribArray(GLProgram::VERTEX_ATTRIB_COLOR);
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_COLOR, 4, GL_UNSIGNED_BYTE, GL_TRUE, kQuadSize, (GLvoid*) offsetof( V3F_C4B_T2F, colors));

    // tex coords
    glEnableVertexAttribArray(GLProgram::VERTEX_ATTRIB_TEX_COORD);
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_TEX_COORD, 2, GL_FLOAT, GL_FALSE, kQuadSize, (GLvoid*) offsetof( V3F_C4B_T2F, texCoords));

    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _buffersVBO[1]);
    glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(_indices[0]) * _capacity * 6, _indices, GL_STATIC_DRAW);

    // Must unbind the VAO before changing the element buffer.
    glBindVertexArray(0);
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
    glBindBuffer(GL_ARRAY_BUFFER, 0);

    CHECK_GL_ERROR_DEBUG();
}

void TextureAtlas::setupVBO()
{
    glGenBuffers(2, &_buffersVBO[0]);

    mapBuffers();
}

void TextureAtlas::mapBuffers()
{
    // Avoid changing the element buffer for whatever VAO might be bound.
    glBindVertexArray(0);
    
    glBindBuffer(GL_ARRAY_BUFFER, _buffersVBO[0]);
    glBufferData(GL_ARRAY_BUFFER, sizeof(_quads[0]) * _capacity, _quads, GL_DYNAMIC_DRAW);
    glBindBuffer(GL_ARRAY_BUFFER, 0);

    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _buffersVBO[1]);
    glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(_indices[0]) * _capacity * 6, _indices, GL_STATIC_DRAW);
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);

    CHECK_GL_ERROR_DEBUG();
}

// TextureAtlas - Update, Insert, Move & Remove

void TextureAtlas::updateQuad(V3F_C4B_T2F_Quad *quad, ssize_t index)
{
    CCASSERT( index >= 0 && index < _capacity, "updateQuadWithTexture: Invalid index");

    _totalQuads = MAX( index+1, _totalQuads);

    _quads[index] = *quad;    


    _dirty = true;

}

void TextureAtlas::insertQuad(V3F_C4B_T2F_Quad *quad, ssize_t index)
{
    CCASSERT( index>=0 && index<_capacity, "insertQuadWithTexture: Invalid index");

    _totalQuads++;
    CCASSERT( _totalQuads <= _capacity, "invalid totalQuads");

    // issue #575. index can be > totalQuads
    auto remaining = (_totalQuads-1) - index;

    // last object doesn't need to be moved
    if( remaining > 0) 
    {
        // texture coordinates
        memmove( &_quads[index+1],&_quads[index], sizeof(_quads[0]) * remaining );        
    }

    _quads[index] = *quad;


    _dirty = true;

}

void TextureAtlas::insertQuads(V3F_C4B_T2F_Quad* quads, ssize_t index, ssize_t amount)
{
    CCASSERT(index>=0 && amount>=0 && index+amount<=_capacity, "insertQuadWithTexture: Invalid index + amount");

    _totalQuads += amount;

    CCASSERT( _totalQuads <= _capacity, "invalid totalQuads");

    // issue #575. index can be > totalQuads
    auto remaining = (_totalQuads-1) - index - amount;

    // last object doesn't need to be moved
    if( remaining > 0)
    {
        // tex coordinates
        memmove( &_quads[index+amount],&_quads[index], sizeof(_quads[0]) * remaining );
    }


    auto max = index + amount;
    int j = 0;
    for (ssize_t i = index; i < max ; i++)
    {
        _quads[index] = quads[j];
        index++;
        j++;
    }

    _dirty = true;
}

void TextureAtlas::insertQuadFromIndex(ssize_t oldIndex, ssize_t newIndex)
{
    CCASSERT( newIndex >= 0 && newIndex < _totalQuads, "insertQuadFromIndex:atIndex: Invalid index");
    CCASSERT( oldIndex >= 0 && oldIndex < _totalQuads, "insertQuadFromIndex:atIndex: Invalid index");

    if( oldIndex == newIndex )
    {
        return;
    }
    // because it is ambiguous in iphone, so we implement abs ourselves
    // unsigned int howMany = std::abs( oldIndex - newIndex);
    auto howMany = (oldIndex - newIndex) > 0 ? (oldIndex - newIndex) :  (newIndex - oldIndex);
    auto dst = oldIndex;
    auto src = oldIndex + 1;
    if( oldIndex > newIndex)
    {
        dst = newIndex+1;
        src = newIndex;
    }

    // texture coordinates
    V3F_C4B_T2F_Quad quadsBackup = _quads[oldIndex];
    memmove( &_quads[dst],&_quads[src], sizeof(_quads[0]) * howMany );
    _quads[newIndex] = quadsBackup;


    _dirty = true;
}

void TextureAtlas::removeQuadAtIndex(ssize_t index)
{
    CCASSERT( index>=0 && index<_totalQuads, "removeQuadAtIndex: Invalid index");

    auto remaining = (_totalQuads-1) - index;

    // last object doesn't need to be moved
    if( remaining ) 
    {
        // texture coordinates
        memmove( &_quads[index],&_quads[index+1], sizeof(_quads[0]) * remaining );
    }

    _totalQuads--;


    _dirty = true;
}

void TextureAtlas::removeQuadsAtIndex(ssize_t index, ssize_t amount)
{
    CCASSERT(index>=0 && amount>=0 && index+amount<=_totalQuads, "removeQuadAtIndex: index + amount out of bounds");

    auto remaining = (_totalQuads) - (index + amount);

    _totalQuads -= amount;

    if ( remaining )
    {
        memmove( &_quads[index], &_quads[index+amount], sizeof(_quads[0]) * remaining );
    }

    _dirty = true;
}

void TextureAtlas::removeAllQuads()
{
    _totalQuads = 0;
}

// TextureAtlas - Resize
bool TextureAtlas::resizeCapacity(ssize_t newCapacity)
{
    CCASSERT(newCapacity >= 0, "capacity >= 0");
    if (newCapacity == _capacity)
    {
        return true;
    }
    auto oldCapacity = _capacity;

    // update capacity and totalQuads
    _totalQuads = MIN(_totalQuads, newCapacity);
    _capacity = newCapacity;

    V3F_C4B_T2F_Quad* tmpQuads = nullptr;
    GLushort* tmpIndices = nullptr;

    // when calling initWithTexture(fileName, 0) on bada device, calloc(0, 1) will fail and return nullptr,
    // so here must judge whether _quads and _indices is nullptr.

    ssize_t _quads_size = sizeof(_quads[0]);
    ssize_t new_quads_size = _capacity * _quads_size;
    if (_quads == nullptr)
    {
        tmpQuads = (V3F_C4B_T2F_Quad*)malloc(new_quads_size);
        if (tmpQuads != nullptr)
        {
            memset(tmpQuads, 0, new_quads_size);
        }
    }
    else
    {
        tmpQuads = (V3F_C4B_T2F_Quad*)realloc(_quads, new_quads_size);
        if (tmpQuads != nullptr && _capacity > oldCapacity)
        {
            memset(tmpQuads + oldCapacity, 0, (_capacity - oldCapacity)*_quads_size);
        }
        _quads = nullptr;
    }

    ssize_t _indices_size = sizeof(_indices[0]);
    ssize_t new_size = _capacity * 6 * _indices_size;

    if (_indices == nullptr)
    {
        tmpIndices = (GLushort*)malloc(new_size);
        if (tmpIndices != nullptr)
        {
            memset(tmpIndices, 0, new_size);
        }
    }
    else
    {
        tmpIndices = (GLushort*)realloc(_indices, new_size);
        if (tmpIndices != nullptr && _capacity > oldCapacity)
        {
            memset(tmpIndices + oldCapacity, 0, (_capacity - oldCapacity) * 6 * _indices_size);
        }
        _indices = nullptr;
    }

    if (!(tmpQuads && tmpIndices)) {
        CCLOG("cocos2d: TextureAtlas: not enough memory");
        CC_SAFE_FREE(tmpQuads);
        CC_SAFE_FREE(tmpIndices);
        CC_SAFE_FREE(_quads);
        CC_SAFE_FREE(_indices);
        _capacity = _totalQuads = 0;
        return false;
    }

    _quads = tmpQuads;
    _indices = tmpIndices;


    setupIndices();
    mapBuffers();

    _dirty = true;

    return true;
}


void TextureAtlas::increaseTotalQuadsWith(ssize_t amount)
{
    CCASSERT(amount>=0, "amount >= 0");
    _totalQuads += amount;
}

void TextureAtlas::moveQuadsFromIndex(ssize_t oldIndex, ssize_t amount, ssize_t newIndex)
{
    CCASSERT(oldIndex>=0 && amount>=0 && newIndex>=0, "values must be >= 0");
    CCASSERT(newIndex + amount <= _totalQuads, "insertQuadFromIndex:atIndex: Invalid index");
    CCASSERT(oldIndex < _totalQuads, "insertQuadFromIndex:atIndex: Invalid index");

    if( oldIndex == newIndex )
    {
        return;
    }
    //create buffer
    size_t quadSize = sizeof(V3F_C4B_T2F_Quad);
    V3F_C4B_T2F_Quad* tempQuads = (V3F_C4B_T2F_Quad*)malloc( quadSize * amount);
    memcpy( tempQuads, &_quads[oldIndex], quadSize * amount );

    if (newIndex < oldIndex)
    {
        // move quads from newIndex to newIndex + amount to make room for buffer
        memmove( &_quads[newIndex], &_quads[newIndex+amount], (oldIndex-newIndex)*quadSize);
    }
    else
    {
        // move quads above back
        memmove( &_quads[oldIndex], &_quads[oldIndex+amount], (newIndex-oldIndex)*quadSize);
    }
    memcpy( &_quads[newIndex], tempQuads, amount*quadSize);

    free(tempQuads);

    _dirty = true;
}

void TextureAtlas::moveQuadsFromIndex(ssize_t index, ssize_t newIndex)
{
    CCASSERT(index>=0 && newIndex>=0, "values must be >= 0");
    CCASSERT(newIndex + (_totalQuads - index) <= _capacity, "moveQuadsFromIndex move is out of bounds");

    memmove(_quads + newIndex,_quads + index, (_totalQuads - index) * sizeof(_quads[0]));
}

void TextureAtlas::fillWithEmptyQuadsFromIndex(ssize_t index, ssize_t amount)
{
    CCASSERT(index>=0 && amount>=0, "values must be >= 0");
    V3F_C4B_T2F_Quad quad;
    memset(&quad, 0, sizeof(quad));

    auto to = index + amount;
    for (ssize_t i = index ; i < to ; i++)
    {
        _quads[i] = quad;
    }
}

// TextureAtlas - Drawing

void TextureAtlas::drawQuads()
{
    this->drawNumberOfQuads(_totalQuads, 0);
}

void TextureAtlas::drawNumberOfQuads(ssize_t numberOfQuads)
{
    CCASSERT(numberOfQuads>=0, "numberOfQuads must be >= 0");
    this->drawNumberOfQuads(numberOfQuads, 0);
}

void TextureAtlas::drawNumberOfQuads(ssize_t numberOfQuads, ssize_t start)
{
    CCASSERT(numberOfQuads>=0 && start>=0, "numberOfQuads and start must be >= 0");

    if(!numberOfQuads)
        return;
    
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, _texture->getName());

    auto conf = Configuration::getInstance();
    if (conf->supportsShareableVAO() && conf->supportsMapBuffer())
    {
        //
        // Using VBO and VAO
        //

        // FIXME:: update is done in draw... perhaps it should be done in a timer
        if (_dirty) 
        {
            glBindBuffer(GL_ARRAY_BUFFER, _buffersVBO[0]);
            // option 1: subdata
//            glBufferSubData(GL_ARRAY_BUFFER, sizeof(_quads[0])*start, sizeof(_quads[0]) * n , &_quads[start] );

            // option 2: data
//            glBufferData(GL_ARRAY_BUFFER, sizeof(quads_[0]) * (n-start), &quads_[start], GL_DYNAMIC_DRAW);

            // option 3: orphaning + glMapBuffer
            glBufferData(GL_ARRAY_BUFFER, sizeof(_quads[0]) * _capacity, nullptr, GL_DYNAMIC_DRAW);
            void *buf = glMapBuffer(GL_ARRAY_BUFFER, GL_WRITE_ONLY);
            memcpy(buf, _quads, sizeof(_quads[0])* _totalQuads);
            glUnmapBuffer(GL_ARRAY_BUFFER);
            
            glBindBuffer(GL_ARRAY_BUFFER, 0);

            _dirty = false;
        }

        glBindVertexArray(_VAOname);

#if CC_REBIND_INDICES_BUFFER
        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _buffersVBO[1]);
#endif

        glDrawElements(GL_TRIANGLES, (GLsizei) numberOfQuads*6, GL_UNSIGNED_SHORT, (GLvoid*) (start*6*sizeof(_indices[0])) );
        
        glBindVertexArray(0);
        
#if CC_REBIND_INDICES_BUFFER
        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
#endif

//    glBindVertexArray(0);
    }
    else
    {
        //
        // Using VBO without VAO
        //

#define kQuadSize sizeof(_quads[0].bl)
        glBindBuffer(GL_ARRAY_BUFFER, _buffersVBO[0]);

        // FIXME:: update is done in draw... perhaps it should be done in a timer
        if (_dirty) 
        {
            glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(_quads[0]) * _totalQuads , &_quads[0] );
            _dirty = false;
        }

        glEnableVertexAttribArray(GLProgram::VERTEX_ATTRIB_POSITION);
        glEnableVertexAttribArray(GLProgram::VERTEX_ATTRIB_COLOR);
        glEnableVertexAttribArray(GLProgram::VERTEX_ATTRIB_TEX_COORD);

        // vertices
        glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 3, GL_FLOAT, GL_FALSE, kQuadSize, (GLvoid*) offsetof(V3F_C4B_T2F, vertices));

        // colors
        glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_COLOR, 4, GL_UNSIGNED_BYTE, GL_TRUE, kQuadSize, (GLvoid*) offsetof(V3F_C4B_T2F, colors));

        // tex coords
        glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_TEX_COORD, 2, GL_FLOAT, GL_FALSE, kQuadSize, (GLvoid*) offsetof(V3F_C4B_T2F, texCoords));

        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _buffersVBO[1]);

        glDrawElements(GL_TRIANGLES, (GLsizei)numberOfQuads*6, GL_UNSIGNED_SHORT, (GLvoid*) (start*6*sizeof(_indices[0])));

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

    CC_INCREMENT_GL_DRAWN_BATCHES_AND_VERTICES(1,numberOfQuads*6);
    
    CHECK_GL_ERROR_DEBUG();
}


NS_CC_END