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#version 330 core
#if defined VERTEX_SHADER
in vec3 in_position;
in vec2 in_texcoord_0;
out vec2 texcoord;
void main() {
gl_Position = vec4(in_position, 1.0);
texcoord = in_texcoord_0;
}
#elif defined FRAGMENT_SHADER
uniform sampler2D input_texture;
in vec2 texcoord;
layout(location=0) out float blurred_texture;
void main() {
vec2 texel_size = 1.0 / vec2(textureSize(input_texture, 0));
float result = 0.0;
const int h = 2;
uint n_samples = 0u;
for (int x = -h; x <= h; ++x) {
for (int y = -h; y <= h; ++y) {
vec2 offset = vec2(float(x), float(y)) * texel_size;
float sample = texture(input_texture, texcoord + offset).x;
if (sample != 0.0) {
result += sample;
++n_samples;
}
}
}
blurred_texture = result / float(n_samples);
}
#endif
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