| 5 | var fragment = "varying vec2 vMaskCoord;\nvarying vec2 vTextureCoord;\n\nuniform sampler2D uSampler;\nuniform sampler2D mask;\nuniform float alpha;\nuniform float npmAlpha;\nuniform vec4 maskClamp;\n\nvoid main(void)\n{\n float clip = step(3.5,\n step(maskClamp.x, vMaskCoord.x) +\n step(maskClamp.y, vMaskCoord.y) +\n step(vMaskCoord.x, maskClamp.z) +\n step(vMaskCoord.y, maskClamp.w));\n\n vec4 original = texture2D(uSampler, vTextureCoord);\n vec4 masky = texture2D(mask, vMaskCoord);\n float alphaMul = 1.0 - npmAlpha * (1.0 - masky.a);\n\n original *= (alphaMul * masky.r * alpha * clip);\n\n gl_FragColor = original;\n}\n";
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