前端之家收集整理的这篇文章主要介绍了
cocos2dx lua版本让图片变灰，
前端之家小编觉得挺不错的，现在分享给大家，也给大家做个参考。
function UI.setSpriteGray( sp )
local vertShaderByteArray = "\n"..
"attribute vec4 a_position; \n" ..
"attribute vec2 a_texCoord; \n" ..
"attribute vec4 a_color; \n"..
"#ifdef GL_ES \n"..
"varying lowp vec4 v_fragmentColor;\n"..
"varying mediump vec2 v_texCoord;\n"..
"#else \n" ..
"varying vec4 v_fragmentColor; \n" ..
"varying vec2 v_texCoord; \n"..
"#endif \n"..
"void main() \n"..
"{\n" ..
"gl_Position = CC_PMatrix * a_position; \n"..
"v_fragmentColor = a_color;\n"..
"v_texCoord = a_texCoord;\n"..
"}"
local flagShaderByteArray = "#ifdef GL_ES \n" ..
"precision mediump float; \n" ..
"#endif \n" ..
"varying vec4 v_fragmentColor; \n" ..
"varying vec2 v_texCoord; \n" ..
"void main(void) \n" ..
"{ \n" ..
"vec4 c = texture2D(CC_Texture0,v_texCoord); \n" ..
"gl_FragColor.xyz = vec3(0.4*c.r + 0.4*c.g +0.4*c.b); \n"..
"gl_FragColor.w = c.w; \n"..
"}"
local glProgram = cc.GLProgram:createWithByteArrays(vertShaderByteArray,flagShaderByteArray)
glProgram:bindAttribLocation(cc.ATTRIBUTE_NAME_POSITION,cc.VERTEX_ATTRIB_POSITION)
glProgram:bindAttribLocation(cc.ATTRIBUTE_NAME_COLOR,cc.VERTEX_ATTRIB_COLOR)
glProgram:bindAttribLocation(cc.ATTRIBUTE_NAME_TEX_COORD,cc.VERTEX_ATTRIB_FLAG_TEX_COORDS)
glProgram:link()
glProgram:updateUniforms()
sp:setGLProgram( glProgram )
end 原文链接：https://www.f2er.com/cocos2dx/339258.html
