cocos2dx lua 图片去色shader

最新推荐文章于 2023-09-23 17:04:10 发布

weixin_30716725

最新推荐文章于 2023-09-23 17:04:10 发布

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CC 4.0 BY-SA版权

文章标签： lua

原文链接：http://www.cnblogs.com/dongerlei/p/10032561.html

本文详细介绍了在Cocos2d-x中如何使用自定义的shader来实现Sprite节点的灰度显示效果，通过修改顶点着色器和片段着色器的代码，使Sprite在游戏场景中呈现为灰度图像，但此方法对文本节点无效。

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function FreeCardTool:setNodeGray(node)
    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(0.2126*c.r + 0.7152*c.g +0.0722*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()
    node:setGLProgram( glProgram )
end