23 lines
775 B
Plaintext
23 lines
775 B
Plaintext
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shader_type canvas_item;
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// Use the captured screen texture from the BackBufferCopy
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uniform sampler2D screen_texture : hint_screen_texture, filter_linear_mipmap;
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uniform float threshold : hint_range(0.0, 2.0) = 0.5;
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uniform float smoothness : hint_range(0.0, 1.0) = 0.02;
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uniform vec4 fluid_color : source_color = vec4(0.2, 0.5, 1.0, 1.0);
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void fragment() {
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// 1. Grab the pixel from the 'screen' behind this ColorRect
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vec4 screen_color = texture(screen_texture, SCREEN_UV);
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// 2. Read the brightness (density)
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float density = screen_color.r;
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// 3. Apply the threshold/cutoff
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float alpha = smoothstep(threshold, threshold + smoothness, density);
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// 4. Output the fluid
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COLOR = vec4(fluid_color.rgb, alpha * fluid_color.a);
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}
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