Cocos openGL编写自己的Shaders

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cocos2d-x 3.5，lua环境下实现按钮变灰；

代码调用：

    local program = cc.GLProgram:create("Shaders/Gray.vsh", "Shaders/Gray.fsh")    program:bindAttribLocation(cc.ATTRIBUTE_NAME_POSITION, cc.VERTEX_ATTRIB_POSITION)     program:bindAttribLocation(cc.ATTRIBUTE_NAME_TEX_COORD, cc.VERTEX_ATTRIB_TEX_COORD)    program:link()    program:updateUniforms()label:setGLProgram( program )

自己的vsh和fsh

attribute vec4 a_position;attribute vec2 a_texCoord;attribute vec4 a_color;                    varying vec4 v_fragmentColor;varying vec2 v_texCoord;                                void main()    {                                gl_Position = CC_PMatrix * a_position;    v_fragmentColor = a_color;    v_texCoord = a_texCoord;}gray.vsh

varying vec4 v_fragmentColor;    varying vec2 v_texCoord;    uniform sampler2D CC_Texture0;            void main()            {    vec4 v_orColor = v_fragmentColor * texture2D(CC_Texture0, v_texCoord);    float gray = dot(v_orColor.rgb, vec3(0.299, 0.587, 0.114));    gl_FragColor = vec4(gray, gray, gray, v_orColor.a);}                gray.fsh

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