export declare const blur_frag = "\nprecision highp float;\nprecision highp int;\nprecision highp sampler2D;\n\nuniform sampler2D tInput;\nuniform vec2 uTexSizeInv;\n\nuniform vec2 uDirection;\nuniform float uGaussianCoefficients[dKernelRadius];\n\nvoid main(void) {\n    vec2 coords = gl_FragCoord.xy * uTexSizeInv;\n    float weightSum = uGaussianCoefficients[0];\n    vec4 diffuseSum = texture2D(tInput, coords) * weightSum;\n\n    for(int i = 1; i < dKernelRadius; ++i) {\n        float x = float(i);\n        float w = uGaussianCoefficients[i];\n        vec2 offset = uDirection * uTexSizeInv * x;\n        vec4 sample1 = texture2D(tInput, coords + offset);\n        vec4 sample2 = texture2D(tInput, coords - offset);\n        diffuseSum += (sample1 + sample2) * w;\n        weightSum += 2.0 * w;\n    }\n\n    gl_FragColor = diffuseSum / weightSum;\n}\n";