cpp

#include "HelloWorldScene.h"

USING_NS_CC;

Scene *HelloWorld::createScene(){
    auto scene = Scene::create();
    auto layer = HelloWorld::create();
    scene->addChild(layer);
    return scene;
}

bool HelloWorld::init(){
    if(!Layer::init()){ return false; }
	m_visibleSize = Director::getInstance()->getVisibleSize();

	//スプライトを作成
	m_sprite1 = Sprite::create("HelloWorld512.png"); //※mipmap使うときは2のN乗のサイズじゃないとコケる
	m_textureSize = m_sprite1->getTexture()->getContentSizeInPixels();
	m_sprite1->setPosition(m_visibleSize.width / 2.0f, m_visibleSize.height / 2.0f);
	m_sprite1->setScale(1.0f);

	//スプライトにミップマップを作成
	m_sprite1->getTexture()->generateMipmap();
	Texture2D::TexParams texParams = { GL_LINEAR_MIPMAP_LINEAR, GL_LINEAR, GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE };
//	Texture2D::TexParams texParams = { GL_LINEAR_MIPMAP_NEAREST, GL_NEAREST, GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE };
//	Texture2D::TexParams texParams = { GL_NEAREST_MIPMAP_LINEAR, GL_NEAREST, GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE };
//	Texture2D::TexParams texParams = { GL_NEAREST_MIPMAP_NEAREST, GL_NEAREST, GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE };
	m_sprite1->getTexture()->setTexParameters(texParams);

	//シェーダをスプライトに紐付け
	GLProgram *shader1 = new GLProgram();
	m_sprite1->setShaderProgram(shader1);
	shader1->initWithFilenames("shaders/lerpblur.vsh", "shaders/lerpblur.fsh");
	shader1->bindAttribLocation(GLProgram::ATTRIBUTE_NAME_POSITION, GLProgram::VERTEX_ATTRIB_POSITION);
	shader1->bindAttribLocation(GLProgram::ATTRIBUTE_NAME_TEX_COORD, GLProgram::VERTEX_ATTRIB_TEX_COORDS);
	shader1->bindAttribLocation(GLProgram::ATTRIBUTE_NAME_COLOR, GLProgram::VERTEX_ATTRIB_COLOR);
	shader1->link();
	shader1->updateUniforms();
	//※biasは0.5区切りでダウンサンプルされている（ように見える）
	shader1->setUniformLocationWith1f(shader1->getUniformLocationForName("bias"), 0.0f);

	addChild(m_sprite1);
	scheduleUpdate();

	return true;
}
void HelloWorld::update(float delta){
	timeval tv;
	gettimeofday(&tv, nullptr);
	long now = tv.tv_sec * 1000 + tv.tv_usec / 1000;
	now = abs((abs(now) % 10000) - 5000);

	//紐付け済みのシェーダを取得して、ミップマップのバイアスを更新
	GLProgram *shader1 = m_sprite1->getShaderProgram();
	shader1->updateUniforms();
	shader1->setUniformLocationWith1f(shader1->getUniformLocationForName("bias"), now * 0.0016f);
}

void HelloWorld::menuCloseCallback(Ref* pSender){
#if (CC_TARGET_PLATFORM == CC_PLATFORM_WP8) || (CC_TARGET_PLATFORM == CC_PLATFORM_WINRT)
	MessageBox("You pressed the close button. Windows Store Apps do not implement a close button.","Alert");
    return;
#endif

    Director::getInstance()->end();

#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
    exit(0);
#endif
}

fsh

#ifdef GL_ES
precision mediump float;
#endif

varying vec2        v_texCoord;
varying lowp vec4   v_color;
uniform sampler2D   u_texture;
uniform vec2        u_texSize;

uniform float       bias;

void main(){
	vec4 texColor = texture2D(u_texture, v_texCoord, bias);
	gl_FragColor  = texColor * v_color;
}

ｖsh

attribute vec4 a_position;
attribute vec2 a_texCoord;
attribute vec4 a_color;

varying vec2 v_texCoord;
varying vec4 v_color;
  
void main() {
    gl_Position = CC_PMatrix * a_position;
    v_color = a_color;
    v_texCoord = a_texCoord;
}