axmol/extensions/CCArmature/display/CCShaderNode.cpp

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#include "CCShaderNode.h"

NS_CC_EXT_BEGIN

enum 
{
    SIZE_X = 128,
    SIZE_Y = 128,
};

CCShaderNode::CCShaderNode()
:m_center(vertex2(0.0f, 0.0f))
,m_resolution(vertex2(0.0f, 0.0f))
,m_time(0.0f)
,m_uniformCenter(0)
,m_uniformResolution(0)
,m_uniformTime(0)
{
}

CCShaderNode* CCShaderNode::shaderNodeWithVertex(const char *vert, const char *frag)
{
    CCShaderNode *node = new CCShaderNode();
    node->initWithVertex(vert, frag);
    node->autorelease();

    return node;
}

bool CCShaderNode::initWithVertex(const char *vert, const char *frag)
{

    loadShaderVertex(vert, frag);

    m_time = 0;
    m_resolution = vertex2(SIZE_X, SIZE_Y);

    scheduleUpdate();

    setContentSize(CCSizeMake(SIZE_X, SIZE_Y));
    setAnchorPoint(ccp(0.5f, 0.5f));

    return true;
}

void CCShaderNode::loadShaderVertex(const char *vert, const char *frag)
{
    CCGLProgram *shader = new CCGLProgram();
    shader->initWithVertexShaderFilename(vert, frag);

    shader->addAttribute("aVertex", kCCVertexAttrib_Position);
    shader->link();

    shader->updateUniforms();

    m_uniformCenter = glGetUniformLocation(shader->getProgram(), "center");
    m_uniformResolution = glGetUniformLocation(shader->getProgram(), "resolution");
    m_uniformTime = glGetUniformLocation(shader->getProgram(), "time");

    this->setShaderProgram(shader);

    shader->release();
}

void CCShaderNode::update(float dt)
{
    m_time += dt;
}

void CCShaderNode::translateFormOtherNode(CCAffineTransform &transform)
{
	CCNode::setAdditionalTransform(transform);

	m_center = vertex2(m_sAdditionalTransform.tx * CC_CONTENT_SCALE_FACTOR(), m_sAdditionalTransform.ty * CC_CONTENT_SCALE_FACTOR());
	m_resolution = vertex2( SIZE_X * m_sAdditionalTransform.a, SIZE_Y * m_sAdditionalTransform.d);
}

void CCShaderNode::setPosition(const CCPoint &newPosition)
{
    CCNode::setPosition(newPosition);
    CCPoint position = getPosition();
    m_center = vertex2(position.x * CC_CONTENT_SCALE_FACTOR(), position.y * CC_CONTENT_SCALE_FACTOR());
}

void CCShaderNode::draw()
{
    CC_NODE_DRAW_SETUP();

    float w = SIZE_X, h = SIZE_Y;
    GLfloat vertices[12] = {0,0, w,0, w,h, 0,0, 0,h, w,h};

    //
    // Uniforms
    //
    getShaderProgram()->setUniformLocationWith2f(m_uniformCenter, m_center.x, m_center.y);
    getShaderProgram()->setUniformLocationWith2f(m_uniformResolution, m_resolution.x, m_resolution.y);


    // time changes all the time, so it is Ok to call OpenGL directly, and not the "cached" version
    glUniform1f(m_uniformTime, m_time);

    ccGLEnableVertexAttribs( kCCVertexAttribFlag_Position );

    glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, vertices);

    glDrawArrays(GL_TRIANGLES, 0, 6);
    
    CC_INCREMENT_GL_DRAWS(1);
}
    

NS_CC_EXT_END