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qzdoom-gpl/wadsrc/static/shaders/glsl/func_warp1.fp

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uniform float timer;
vec4 ProcessTexel()
{
vec2 texCoord = vTexCoord.st;
const float pi = 3.14159265358979323846;
vec2 offset = vec2(0,0);
offset.y = sin(pi * 2.0 * (texCoord.x + timer * 0.125)) * 0.1;
offset.x = sin(pi * 2.0 * (texCoord.y + timer * 0.125)) * 0.1;
texCoord += offset;
return getTexel(texCoord);
}