axmol/extensions/CCArmature/display/CCShaderNode.cpp

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#include "CCShaderNode.h"

namespace cocos2d { namespace extension { namespace armature {

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

ShaderNode::ShaderNode()
    : _center(Vertex2F(0.0f, 0.0f))
    , _resolution(Vertex2F(0.0f, 0.0f))
    , _time(0.0f)
    , _uniformCenter(0)
    , _uniformResolution(0)
    , _uniformTime(0)
{
}

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

    return node;
}

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

    loadShaderVertex(vert, frag);

    _time = 0;
    _resolution = Vertex2F(SIZE_X, SIZE_Y);

    scheduleUpdate();

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

    return true;
}

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

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

    shader->updateUniforms();

    _uniformCenter = glGetUniformLocation(shader->getProgram(), "center");
    _uniformResolution = glGetUniformLocation(shader->getProgram(), "resolution");
    _uniformTime = glGetUniformLocation(shader->getProgram(), "time");

    this->setShaderProgram(shader);

    shader->release();
}

void ShaderNode::update(float dt)
{
    _time += dt;
}

void ShaderNode::translateFormOtherNode(AffineTransform &transform)
{
    Node::setAdditionalTransform(transform);

    _center = Vertex2F(_additionalTransform.tx * CC_CONTENT_SCALE_FACTOR(), _additionalTransform.ty * CC_CONTENT_SCALE_FACTOR());
    _resolution = Vertex2F( SIZE_X * _additionalTransform.a, SIZE_Y * _additionalTransform.d);
}

void ShaderNode::setPosition(const Point &newPosition)
{
    Node::setPosition(newPosition);
    Point position = getPosition();
    _center = Vertex2F(position.x * CC_CONTENT_SCALE_FACTOR(), position.y * CC_CONTENT_SCALE_FACTOR());
}

void ShaderNode::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(_uniformCenter, _center.x, _center.y);
    getShaderProgram()->setUniformLocationWith2f(_uniformResolution, _resolution.x, _resolution.y);


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

    ccGLEnableVertexAttribs( kVertexAttribFlag_Position );

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

    glDrawArrays(GL_TRIANGLES, 0, 6);

    CC_INCREMENT_GL_DRAWS(1);
}


}}} // namespace cocos2d { namespace extension { namespace armature {