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#version 300 es
precision highp float;
in vec2 v_texcoord;
uniform sampler2D tex;
uniform float TIME;
out vec4 fragColor;
// --- CONFIGURATION ---
const float wobble_speed = 3.0; // Animation speed
const float wobble_frequency = 15.0; // Wave density
const float wobble_amplitude = 0.025; // Displacement amount
const float edge_fade = 0.1; // Fade near edges (0.0 to disable)
const bool organic_motion = true; // Multi-frequency for natural look
const bool prevent_edge_artifacts = true;
// ---------------------
void main() {
// Use local time to prevent floating point precision issues with large TIME values
float t = mod(TIME, 628.318); // Wrap at 2*PI*100
vec2 new_uv = v_texcoord;
// Calculate edge fade mask (reduces artifacts at screen borders)
float edge_mask = 1.0;
if (edge_fade > 0.0) {
vec2 dist_to_edge = min(v_texcoord, 1.0 - v_texcoord);
float min_dist = min(dist_to_edge.x, dist_to_edge.y);
edge_mask = smoothstep(0.0, edge_fade, min_dist);
}
float amplitude = wobble_amplitude * edge_mask;
float h_offset, v_offset;
if (organic_motion) {
// Layer multiple frequencies for organic, natural motion
// Different speeds prevent repetitive patterns
// Horizontal wobble (based on Y position)
h_offset = 0.0;
h_offset += sin(v_texcoord.y * wobble_frequency * 1.0 + t * wobble_speed * 1.00) * 0.50;
h_offset += sin(v_texcoord.y * wobble_frequency * 2.1 + t * wobble_speed * 1.37) * 0.30;
h_offset += sin(v_texcoord.y * wobble_frequency * 0.5 + t * wobble_speed * 0.71) * 0.20;
// Vertical wobble (based on X position)
v_offset = 0.0;
v_offset += cos(v_texcoord.x * wobble_frequency * 0.9 + t * wobble_speed * 1.13) * 0.50;
v_offset += cos(v_texcoord.x * wobble_frequency * 1.7 + t * wobble_speed * 0.83) * 0.30;
v_offset += cos(v_texcoord.x * wobble_frequency * 0.4 + t * wobble_speed * 1.41) * 0.20;
// Add subtle interaction between axes
h_offset += sin(v_texcoord.x * wobble_frequency * 0.3 + t * wobble_speed * 0.5) * 0.1;
v_offset += cos(v_texcoord.y * wobble_frequency * 0.3 + t * wobble_speed * 0.6) * 0.1;
} else {
// Simple single-frequency wobble
h_offset = sin(v_texcoord.y * wobble_frequency + t * wobble_speed);
v_offset = cos(v_texcoord.x * wobble_frequency + t * wobble_speed);
}
new_uv.x += h_offset * amplitude;
new_uv.y += v_offset * amplitude;
// Prevent sampling outside texture bounds
if (prevent_edge_artifacts) {
// Clamp with small margin to prevent edge bleeding
new_uv = clamp(new_uv, 0.002, 0.998);
}
fragColor = texture(tex, new_uv);
}
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