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uniforms are not updated on v4 rc3


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following link is example

i set mark of uniformsd
it has like following code


    uniforms.mark= {
        type: '2f',
        value: {
            x: 0.5,
            y: 0.5

but it look like not have  any value in fragmentshader. 


    var fragmentSrc = [
        "precision mediump float;",
        "uniform vec4      filterArea;",
        'varying vec2 vTextureCoord;',
        'uniform sampler2D uSampler;',
        "uniform float     time;",
        "uniform vec2      mark;",
        "const float max_dist = 0.2;",
        "void main() {",
        "vec2 start = vTextureCoord.xy;",
        "float dist = distance(start, mark);",        //Wrong  -------------
        "if(dist < max_dist) {",
        "   vec4 color1  =texture2D(uSampler, vTextureCoord);",
        "   vec4 color2 = vec4(1.0, 1.0, 0.0, 1.0);",
        "   gl_FragColor = mix(color1, color2, 0.5);",
        "} else {",
        "    gl_FragColor = vec4(1.0, 0.0,  0.0, 1.0);",
        "   vec4 color1  =texture2D(uSampler, vTextureCoord);",
        "   vec4 color2 = vec4(1.0, 0.0, 0.0, 1.0);",
        "   gl_FragColor = mix(color1, color2, 0.5);",

if change  'float dist = distance(start, makr)  to following code,  shader is good


vec2 end = vec(0.5, 0.5);

if float dist = distance(start, end)


can you tell me where is wrong?

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