fft_fragment_program_blur.glsl.frag.h

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#include "shaders_common.h"

static const char *fft_fragment_program_blur = GLSL_300(
 precision mediump float;
 precision highp int;
 precision highp usampler2D;
 precision highp isampler2D;
 in vec2 vTex;
 out vec4 FragColor;
 uniform sampler2D sHeight;

 void main() {
 float k = 0.0;
 float t;
 vec4 res = vec4(0.0);
 \n#define kernel(x, y) t = exp(-0.35 * float((x) * (x) + (y) * (y))); k += t; res += t * textureLodOffset(sHeight, vTex, 0.0, ivec2(x, y))\n
 kernel(-1, -2);
 kernel(-1, -1);
 kernel(-1, 0);
 kernel( 0, -2);
 kernel( 0, -1);
 kernel( 0, 0);
 kernel( 1, -2);
 kernel( 1, -1);
 kernel( 1, 0);
 FragColor = res / k;
 }
);