/* Copyright (c) 2012 Scott Lembcke and Howling Moon Software
 * Copyright (c) 2012 cocos2d-x.org
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * 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,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include "CCDrawNode.h"
#include "support/CCPointExtension.h"
#include "shaders/CCShaderCache.h"

NS_CC_BEGIN

// ccVertex2F == CGPoint in 32-bits, but not in 64-bits (OS X)
// that's why the "v2f" functions are needed
static ccVertex2F v2fzero = (ccVertex2F){0,0};

static inline ccVertex2F v2f(float x, float y)
{
	return (ccVertex2F){x,y};
}

static inline ccVertex2F v2fadd(const ccVertex2F &v0, const ccVertex2F &v1)
{
	return v2f(v0.x+v1.x, v0.y+v1.y);
}

static inline ccVertex2F v2fsub(const ccVertex2F &v0, const ccVertex2F &v1)
{
	return v2f(v0.x-v1.x, v0.y-v1.y);
}

static inline ccVertex2F v2fmult(const ccVertex2F &v, float s)
{
	return v2f(v.x * s, v.y * s);
}

static inline ccVertex2F v2fperp(const ccVertex2F &p0)
{
	return v2f(-p0.y, p0.x);
}

static inline ccVertex2F v2fneg(const ccVertex2F &p0)
{
	return v2f(-p0.x, - p0.y);
}

static inline float v2fdot(const ccVertex2F &p0, const ccVertex2F &p1)
{
	return  p0.x * p1.x + p0.y * p1.y;
}

static inline ccVertex2F v2fforangle(float _a_)
{
	return v2f(cosf(_a_), sinf(_a_));
}

static inline ccVertex2F v2fnormalize(const ccVertex2F &p)
{
	CCPoint r = ccpNormalize(ccp(p.x, p.y));
	return v2f(r.x, r.y);
}

static inline ccVertex2F __v2f(const CCPoint &v)
{
#ifdef __LP64__
	return v2f(v.x, v.y);
#else
	return * ((ccVertex2F*) &v);
#endif
}

static inline ccTex2F __t(const ccVertex2F &v)
{
	return *(ccTex2F*)&v;
}

// implementation of CCDrawNode

CCDrawNode::CCDrawNode()
: m_uVao(0)
, m_uVbo(0)
, m_uBufferCapacity(0)
, m_nBufferCount(0)
, m_pBuffer(NULL)
, m_sBlendFunc((ccBlendFunc){CC_BLEND_SRC, CC_BLEND_DST})
, m_bDirty(false)
{}

CCDrawNode* CCDrawNode::create()
{
    CCDrawNode* pRet = new CCDrawNode();
    if (pRet && pRet->init())
    {
        pRet->autorelease();
    }
    else
    {
        CC_SAFE_DELETE(pRet);
    }
    
    return pRet;
}

bool CCDrawNode::init()
{
    m_sBlendFunc = (ccBlendFunc){CC_BLEND_SRC, CC_BLEND_DST};
    
    setShaderProgram(CCShaderCache::sharedShaderCache()->programForKey(kCCShader_PositionLengthTexureColor));
    
    ensureCapacity(512);
    
    glGenVertexArrays(1, &m_uVao);
    ccGLBindVAO(m_uVao);
    
    glGenBuffers(1, &m_uVbo);
    glBindBuffer(GL_ARRAY_BUFFER, m_uVbo);
    glBufferData(GL_ARRAY_BUFFER, sizeof(ccV2F_C4B_T2F)* m_uBufferCapacity, m_pBuffer, GL_STREAM_DRAW);
    
    glEnableVertexAttribArray(kCCVertexAttrib_Position);
    glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, sizeof(ccV2F_C4B_T2F), (GLvoid *)offsetof(ccV2F_C4B_T2F, vertices));
    
    glEnableVertexAttribArray(kCCVertexAttrib_Color);
    glVertexAttribPointer(kCCVertexAttrib_Color, 4, GL_UNSIGNED_BYTE, GL_TRUE, sizeof(ccV2F_C4B_T2F), (GLvoid *)offsetof(ccV2F_C4B_T2F, colors));
    
    glEnableVertexAttribArray(kCCVertexAttrib_TexCoords);
    glVertexAttribPointer(kCCVertexAttrib_TexCoords, 2, GL_FLOAT, GL_FALSE, sizeof(ccV2F_C4B_T2F), (GLvoid *)offsetof(ccV2F_C4B_T2F, texCoords));
    
    glBindBuffer(GL_ARRAY_BUFFER, 0);
    ccGLBindVAO(0);
    
    CHECK_GL_ERROR_DEBUG();
    
    m_bDirty = true;
    
    return true;
}

NS_CC_END