E250429F
71 lines
3.1 KiB
Plaintext
71 lines
3.1 KiB
Plaintext
// painterly_water.gdshader — Godot 4.x
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// Flat, gouache-style water for a straight river + cascade.
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//
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// RIVER preset: uv_scale = vec2(2.0, 6.0), flow_speed = 0.10, wobble = 0.05
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// FALL preset: uv_scale = vec2(3.0, 1.0), flow_speed = 0.55, wobble = 0.02,
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// edge_foam_top = 0.25, edge_foam_bottom = 0.35, foam_amount = 0.75
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// POOL preset: uv_scale = vec2(3.0, 3.0), flow_speed = 0.03, wobble = 0.08
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shader_type spatial;
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render_mode blend_mix, cull_disabled, diffuse_lambert, specular_disabled, shadows_disabled;
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// --- palette: keep it to 3 tones + foam, like mixing real paint ---
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uniform vec3 color_deep : source_color = vec3(0.07, 0.26, 0.40);
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uniform vec3 color_mid : source_color = vec3(0.16, 0.50, 0.58);
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uniform vec3 color_light : source_color = vec3(0.48, 0.79, 0.78);
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uniform vec3 color_foam : source_color = vec3(0.95, 0.97, 0.94);
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uniform sampler2D noise_a : repeat_enable, filter_linear;
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uniform sampler2D noise_b : repeat_enable, filter_linear;
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uniform sampler2D canvas : repeat_enable, filter_linear;
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uniform vec2 uv_scale = vec2(2.0, 6.0);
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uniform vec2 flow_dir = vec2(0.0, 1.0); // +Y = "downstream" along the plane's V axis
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uniform float flow_speed = 0.10;
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uniform float wobble : hint_range(0.0, 0.25) = 0.05; // brush wander
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uniform float bands : hint_range(2.0, 8.0) = 4.0; // fewer = more poster-like
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uniform float foam_amount: hint_range(0.0, 1.0) = 0.55;
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// foam strips along the top / bottom edge of the mesh (for the lip and the splash base)
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uniform float edge_foam_top : hint_range(0.0, 0.6) = 0.0;
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uniform float edge_foam_bottom : hint_range(0.0, 0.6) = 0.0;
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uniform float canvas_scale = 4.0;
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uniform float canvas_strength : hint_range(0.0, 1.0) = 0.25;
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void fragment() {
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vec2 uv = UV * uv_scale;
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vec2 flow = flow_dir * TIME * flow_speed;
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// slow low-frequency warp — this is what sells the "hand-painted" wobble
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vec2 warp = (texture(noise_b, uv * 0.3 - flow * 0.25).rg - 0.5) * wobble * 2.0;
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// two layers at different speeds so the motion never looks like a sliding texture
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float n1 = texture(noise_a, uv + warp - flow).r;
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float n2 = texture(noise_a, uv * 1.9 + warp.yx - flow * 1.7 + vec2(0.37)).r;
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float v = n1 * 0.65 + n2 * 0.35;
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// posterize into flat steps — the single most important line here
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float q = floor(v * bands) / max(bands - 1.0, 1.0);
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// edge foam strips
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float top = 1.0 - smoothstep(0.0, max(edge_foam_top, 0.001), UV.y);
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float bottom = smoothstep(1.0 - max(edge_foam_bottom, 0.001), 1.0, UV.y);
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float edge = clamp(top + bottom, 0.0, 1.0) * step(0.35, v); // let noise break it up
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vec3 col = mix(color_deep, color_mid, smoothstep(0.00, 0.50, q));
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col = mix(col, color_light, smoothstep(0.50, 0.85, q));
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col = mix(col, color_foam, step(1.0 - foam_amount * 0.4, q));
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col = mix(col, color_foam, edge);
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// canvas grain in screen space so the paper stays put while the water moves
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float grain = texture(canvas, SCREEN_UV * canvas_scale).r;
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col = mix(col, col * (0.75 + grain * 0.5), canvas_strength);
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ALBEDO = col;
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ROUGHNESS = 1.0;
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SPECULAR = 0.0;
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METALLIC = 0.0;
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}
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