254 lines
8.2 KiB
Text
254 lines
8.2 KiB
Text
shader_type spatial;
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render_mode blend_mix, depth_draw_never, cull_back, unshaded;
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uniform sampler2D depth_texture : hint_depth_texture, repeat_disable, filter_nearest;
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uniform vec4 shore_color : source_color = vec4(0.475, 0.788, 0.796, 1.0);
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uniform vec4 shallow_color : source_color = vec4(0.227, 0.604, 0.663, 1.0);
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uniform vec4 deep_color : source_color = vec4(0.110, 0.345, 0.435, 1.0);
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uniform vec4 tide_wash_color : source_color = vec4(0.360, 0.720, 0.735, 1.0);
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uniform float shallow_depth : hint_range(0.1, 3.0, 0.01) = 0.70;
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uniform float deep_depth : hint_range(0.5, 12.0, 0.05) = 3.60;
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uniform float shore_depth_width : hint_range(0.02, 1.0, 0.01) = 0.16;
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uniform float shore_alpha : hint_range(0.1, 1.0, 0.01) = 0.44;
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uniform float shallow_alpha : hint_range(0.1, 1.0, 0.01) = 0.60;
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uniform float deep_alpha : hint_range(0.1, 1.0, 0.01) = 0.82;
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uniform bool tide_effect_enabled = true;
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uniform float tide_speed : hint_range(0.1, 3.0, 0.01) = 1.42;
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uniform float tide_distance : hint_range(0.0, 0.6, 0.01) = 0.30;
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uniform float tide_wash_width : hint_range(0.05, 1.0, 0.01) = 0.38;
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uniform float tide_wash_strength : hint_range(0.0, 0.3, 0.01) = 0.11;
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uniform float tide_wash_alpha_shift : hint_range(0.0, 0.15, 0.005) = 0.045;
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uniform float phase_noise_scale : hint_range(0.001, 0.5, 0.001) = 0.055;
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uniform float phase_noise_strength : hint_range(0.0, 2.0, 0.01) = 0.68;
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uniform float contour_corner_variation : hint_range(0.0, 0.15, 0.005) = 0.045;
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uniform float contour_smoothing_pixels : hint_range(0.0, 2.5, 0.05) = 1.0;
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uniform float contour_smoothing_strength : hint_range(0.0, 1.0, 0.01) = 0.72;
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uniform float contour_depth_reject : hint_range(0.05, 2.0, 0.01) = 0.60;
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uniform float open_water_drift_scale : hint_range(0.001, 0.3, 0.001) = 0.018;
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uniform vec2 open_water_drift_speed = vec2(0.010, -0.007);
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uniform float open_water_drift_strength : hint_range(0.0, 0.08, 0.001) = 0.045;
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uniform float distant_alpha_start : hint_range(10.0, 2000.0, 1.0) = 260.0;
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uniform float distant_alpha_end : hint_range(20.0, 5000.0, 1.0) = 1400.0;
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uniform vec4 distant_fog_color : source_color = vec4(0.549, 0.749, 0.765, 1.0);
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uniform float distant_fog_begin : hint_range(0.0, 2000.0, 1.0) = 42.0;
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uniform float distant_fog_end : hint_range(1.0, 5000.0, 1.0) = 170.0;
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uniform float distant_fog_strength : hint_range(0.0, 1.0, 0.01) = 0.18;
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varying vec3 world_position;
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varying float surface_view_depth;
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float hash_21(vec2 point) {
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return fract(sin(dot(point, vec2(127.1, 311.7))) * 43758.5453);
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}
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float value_noise(vec2 point) {
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vec2 cell = floor(point);
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vec2 local = fract(point);
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vec2 blend = local * local * (3.0 - 2.0 * local);
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float bottom = mix(hash_21(cell), hash_21(cell + vec2(1.0, 0.0)), blend.x);
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float top = mix(
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hash_21(cell + vec2(0.0, 1.0)),
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hash_21(cell + vec2(1.0, 1.0)),
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blend.x
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);
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return mix(bottom, top, blend.y);
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}
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float reconstruct_view_depth(
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vec2 screen_uv,
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float raw_depth,
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mat4 inverse_projection
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) {
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#if CURRENT_RENDERER == RENDERER_COMPATIBILITY
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vec3 ndc = vec3(screen_uv, raw_depth) * 2.0 - 1.0;
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#else
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vec3 ndc = vec3(screen_uv * 2.0 - 1.0, raw_depth);
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#endif
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vec4 view_position = inverse_projection * vec4(ndc, 1.0);
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return -view_position.z / max(abs(view_position.w), 0.00001);
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}
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float sample_water_depth(
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vec2 screen_uv,
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float water_surface_depth,
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mat4 inverse_projection
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) {
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float raw_depth = texture(depth_texture, screen_uv).r;
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float scene_depth = reconstruct_view_depth(
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screen_uv,
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raw_depth,
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inverse_projection
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);
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return scene_depth - water_surface_depth;
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}
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float contour_neighbor_weight(
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float center_depth,
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float neighbor_depth,
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float rejection_distance
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) {
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if (neighbor_depth <= 0.0) {
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return 0.0;
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}
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float safe_rejection = max(rejection_distance, 0.001);
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return 1.0 - smoothstep(
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safe_rejection * 0.35,
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safe_rejection,
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abs(neighbor_depth - center_depth)
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);
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}
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void vertex() {
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vec4 world_vertex = MODEL_MATRIX * vec4(VERTEX, 1.0);
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vec4 view_vertex = VIEW_MATRIX * world_vertex;
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world_position = world_vertex.xyz;
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surface_view_depth = -view_vertex.z;
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}
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void fragment() {
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float raw_depth = texture(depth_texture, SCREEN_UV).r;
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float scene_view_depth = reconstruct_view_depth(
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SCREEN_UV,
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raw_depth,
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INV_PROJECTION_MATRIX
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);
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float water_depth = max(scene_view_depth - surface_view_depth, 0.0);
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water_depth = min(water_depth, deep_depth * 4.0);
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float contour_depth = water_depth;
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float contour_feature_support = 1.0;
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if (tide_effect_enabled) {
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vec2 contour_texel = (
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vec2(1.0) / vec2(textureSize(depth_texture, 0))
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* contour_smoothing_pixels
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);
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float contour_depth_sum = water_depth;
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float contour_weight_sum = 1.0;
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float left_depth = sample_water_depth(
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SCREEN_UV - vec2(contour_texel.x, 0.0),
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surface_view_depth,
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INV_PROJECTION_MATRIX
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);
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float right_depth = sample_water_depth(
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SCREEN_UV + vec2(contour_texel.x, 0.0),
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surface_view_depth,
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INV_PROJECTION_MATRIX
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);
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float upper_depth = sample_water_depth(
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SCREEN_UV - vec2(0.0, contour_texel.y),
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surface_view_depth,
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INV_PROJECTION_MATRIX
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);
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float lower_depth = sample_water_depth(
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SCREEN_UV + vec2(0.0, contour_texel.y),
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surface_view_depth,
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INV_PROJECTION_MATRIX
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);
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float left_weight = contour_neighbor_weight(
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water_depth, left_depth, contour_depth_reject
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);
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float right_weight = contour_neighbor_weight(
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water_depth, right_depth, contour_depth_reject
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);
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float upper_weight = contour_neighbor_weight(
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water_depth, upper_depth, contour_depth_reject
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);
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float lower_weight = contour_neighbor_weight(
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water_depth, lower_depth, contour_depth_reject
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);
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contour_depth_sum += left_depth * left_weight;
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contour_depth_sum += right_depth * right_weight;
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contour_depth_sum += upper_depth * upper_weight;
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contour_depth_sum += lower_depth * lower_weight;
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float neighbor_support = left_weight + right_weight + upper_weight + lower_weight;
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contour_weight_sum += neighbor_support;
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float smoothed_contour_depth = contour_depth_sum / contour_weight_sum;
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contour_depth = mix(
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water_depth,
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smoothed_contour_depth,
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contour_smoothing_strength
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);
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contour_feature_support = smoothstep(0.75, 1.75, neighbor_support);
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}
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float shallow_mix = smoothstep(0.0, shallow_depth, water_depth);
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float deep_mix = smoothstep(shallow_depth, deep_depth, water_depth);
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vec3 water_color = mix(shore_color.rgb, shallow_color.rgb, shallow_mix);
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water_color = mix(water_color, deep_color.rgb, deep_mix);
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float water_alpha = mix(shore_alpha, shallow_alpha, shallow_mix);
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water_alpha = mix(water_alpha, deep_alpha, deep_mix);
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if (tide_effect_enabled) {
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vec2 phase_coordinates = world_position.xz * phase_noise_scale;
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float phase_variation = (
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value_noise(phase_coordinates)
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+ value_noise(phase_coordinates * 0.47 + vec2(9.7, 3.1)) * 0.5
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- 0.75
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) * phase_noise_strength;
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float corner_variation = (
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value_noise(phase_coordinates * 1.73 + vec2(4.2, 13.6)) * 2.0 - 1.0
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) * contour_corner_variation;
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float ebb = sin(TIME * tide_speed + phase_variation) * 0.5 + 0.5;
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float lead_threshold = shore_depth_width + ebb * tide_distance + corner_variation;
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float tide_wash = 1.0 - smoothstep(
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lead_threshold,
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lead_threshold + max(tide_wash_width, 0.001),
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contour_depth
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);
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tide_wash *= contour_feature_support;
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tide_wash *= 1.0 - smoothstep(shallow_depth, deep_depth, water_depth);
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water_color = mix(
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water_color,
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tide_wash_color.rgb,
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tide_wash * tide_wash_strength
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);
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water_alpha = min(
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water_alpha
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+ tide_wash * tide_wash_alpha_shift,
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0.96
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);
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}
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vec2 drift_coordinates = (
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world_position.xz * open_water_drift_scale
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+ TIME * open_water_drift_speed
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);
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float broad_drift = value_noise(drift_coordinates) * 2.0 - 1.0;
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water_color *= 1.0 + broad_drift * open_water_drift_strength * deep_mix;
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float distant_mix = smoothstep(
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distant_alpha_start,
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max(distant_alpha_end, distant_alpha_start + 1.0),
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surface_view_depth
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);
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water_color = mix(water_color, deep_color.rgb, distant_mix * 0.72);
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water_alpha = mix(water_alpha, 0.96, distant_mix);
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float fog_distance_mix = smoothstep(
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distant_fog_begin,
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max(distant_fog_end, distant_fog_begin + 1.0),
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surface_view_depth
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);
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float water_fog_mix = fog_distance_mix * distant_fog_strength;
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water_color = mix(water_color, distant_fog_color.rgb, water_fog_mix);
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water_alpha = mix(water_alpha, 0.96, water_fog_mix);
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ALBEDO = water_color;
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ALPHA = clamp(water_alpha, 0.1, 0.96);
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METALLIC = 0.0;
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SPECULAR = 0.0;
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ROUGHNESS = 1.0;
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}
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