各位大佬请教一个关于cocos shader的问题

qq_33739641 2019-11-08 12:03:44

最近小弟在研究cocos shader方面的知识刚入门碰到问题自己又无法解决斗胆请教各位大佬
我原本自己写了一个shader程序无法运行看不到纹理后来我又把网上某位大佬的例子抄了过来还是无法看到纹理心中甚是疑惑特来请教：

下面这是大佬的例子也没有报错就是纹理显示不出来
创建精灵：
auto sprite = Sprite::create("HelloWorld.png");
if (sprite == nullptr)
{
problemLoading("'HelloWorld.png'");
}
else
{

sprite->setPosition(Vec2(visibleSize.width/2 + origin.x, visibleSize.height/2 + origin.y));
this->addChild(sprite);
shaderNode(sprite);
}

这是方法
void HelloWorld::shaderNode(Node* node)
{
GLProgram* program = GLProgramCache::getInstance()->getGLProgram("testShader");
if (program == nullptr)
{
program = GLProgram::createWithFilenames("test.vert", "test.frag");
GLProgramCache::getInstance()->addGLProgram(program, "testShader");
}
GLProgramState* programState = GLProgramState::getOrCreateWithGLProgram(program);
programState->setUniformVec4("u_grayParam", Vec4(0.2f, 0.3f, 0.5f, 1.0f));
node->setGLProgramState(programState);
}

顶点着色器
attribute vec4 a_position;
attribute vec2 a_texCoord;
varying vec2 v_texCoord;
void main()
{
gl_Position = CC_PMatrix * a_position;
v_texCoord = a_texCoord;
}

片元着色器
varying vec2 v_texCoord;
uniform vec4 u_grayParam;
void main()
{
vec4 texColor = texture2D(CC_Texture0, v_texCoord);
texColor.rgb = texColor.r * u_grayParam.r + texColor.g * u_grayParam.g + texColor.b * u_grayParam.b;
gl_FragColor = texColor;
}