43 lines
1.6 KiB
Plaintext
43 lines
1.6 KiB
Plaintext
//https://godotshaders.com/shader/transparent-ripples/
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// Attach to a ColorRect in front of texture/background
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shader_type canvas_item;
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// Handles the concentric ripples
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uniform float frequency: hint_range(0, 15, 0.01) = 4.0;
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uniform float amplitude: hint_range(0, 3, 0.1) = 2.0;
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uniform float ripple_rate : hint_range(0, 20.0, 1) = 5;
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// Handles the waves themselves
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uniform float wave_amplitude: hint_range(0.001, 0.1, 0.001) = 0.05;
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uniform float wave_frequency: hint_range(0, 15, 0.01) = 4.0;
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uniform sampler2D noise;
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uniform sampler2D SCREEN_TEXTURE: hint_screen_texture, filter_linear_mipmap;
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vec2 wave(vec2 uv, float time) {
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return vec2(
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uv.x + sin(uv.y * wave_frequency + time) * wave_amplitude,
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uv.y + sin(uv.x * wave_frequency + time) * wave_amplitude
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);
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}
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void fragment() {
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vec2 center_position = -1.0 + 2.0 * UV / (1.0 / TEXTURE_PIXEL_SIZE);
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float center_distance = length(center_position);
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float ripple = sin(center_distance * -frequency * PI + ripple_rate * TIME) * amplitude / (center_distance + 1.0);
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vec2 uv = FRAGCOORD.xy / (1.0 / SCREEN_PIXEL_SIZE).xy + (center_position/center_distance) * ripple * wave_amplitude;
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vec2 background_wave = wave(uv, TIME);
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vec4 background_texture = texture(SCREEN_TEXTURE,background_wave) * sqrt(amplitude);
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float alpha_scalar = (1.0 - min(center_distance, 1.0)) * background_texture.x * 2.5;
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background_texture.a *= 1.0 * alpha_scalar * (ripple + background_texture.x * background_texture.y);
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background_texture.a = max(background_texture.a - (background_texture.y * 0.45), 0.0);
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COLOR = vec4(background_texture.xyz, background_texture.a);
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} |