cocos2dx 流光着色器

添加一个片面着色器

#ifdef GL_ES
precision mediump float;
#endif

varying vec4 v_fragmentColor;
varying vec2 v_texCoord;

uniform float k;//斜率
uniform float b;

void main() {
    float flickerWidth = 0.15;//光的宽度
    vec4 outColor = vec4(1, 1, 1, 1);

    outColor *= texture2D(CC_Texture0, v_texCoord);
     float y = k * v_texCoord.x + b;
    float y1 = 1.0 - v_texCoord.y;
    if(y1 >= y && y1 <= y + flickerWidth)
    {
        vec4 white = vec4(200, 200, 200, 128);
        outColor *= white;
    }

    outColor *= v_fragmentColor;

    gl_FragColor = outColor;
}

创建一个sprite，并且使用该着色器，其中顶点着色器使用cocos默认的

_sprite = Sprite::create("Images/grossinis_sister1.png");
addChild(_sprite);
_sprite->setPosition(Vec2(s.width / 2, s.height / 2));

GLProgram* glprogram = GLProgram::createWithFilenames("Shaders/MultiTexture.vsh", "Shaders/MultiTexture.fsh");
auto glprogramstate = GLProgramState::getOrCreateWithGLProgram(glprogram);
_sprite->setGLProgramState(glprogramstate);

glprogramstate->setUniformFloat("k", 1);//设置45度斜向

float m_fb = 1.0f;//用于变化y轴位置
float m_fbMax = 1.0f;
float m_fbMin = -1.0f;

创建一个定时器更新b值

_scheduler->schedule(schedule_selector(ShaderMultiTexture::run), this, 0, false);


void ShaderMultiTexture::run(float fDelay)
{
    auto programState = _sprite->getGLProgramState();
    programState->setUniformFloat("b", m_fb);

    m_fb -= 0.03f;
    if (m_fb < m_fbMin)
    {
        m_fb = m_fbMax;
    }
}

转载请注明出处，from 博客园 HemJohn