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  • Stroke

    // A simple blur shader, weighted on alpha

    uniform sampler2D texture;

    void main()
    {
        float radius = 0.01;
        vec4 accum = vec4(0.0);
        vec4 normal = vec4(0.0);
        
        normal = texture2D(texture, vec2(gl_TexCoord[0].s, gl_TexCoord[0].t));
        
        accum += texture2D(texture, vec2(gl_TexCoord[0].s-radius, gl_TexCoord[0].t-radius));
        accum += texture2D(texture, vec2(gl_TexCoord[0].s+radius, gl_TexCoord[0].t-radius));
        accum += texture2D(texture, vec2(gl_TexCoord[0].s+radius, gl_TexCoord[0].t+radius));
        accum += texture2D(texture, vec2(gl_TexCoord[0].s-radius, gl_TexCoord[0].t+radius));
        
        accum *= 0.25;
        
        accum.r = 1.0;
        accum.g = 0.0;
        accum.b = 0.0;
        
        normal = (accum * (1.0 - normal.a)) + (normal * normal.a);
        
        gl_FragColor = normal;
    }

    http://www.cnblogs.com/cxiaojia/p/5203421.html  描边

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  • 原文地址:https://www.cnblogs.com/SmileSFL/p/5797561.html
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