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refactor: update the sky shaders (#4)
* refactor: update the sky shaders * chore: add entry in changelog
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,109 @@ | ||
| shader_type sky; | ||
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| render_mode use_half_res_pass; | ||
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| uniform sampler2D source_panorama : filter_linear, | ||
| source_color, | ||
| hint_default_black; | ||
| uniform bool add_clouds = true; | ||
| uniform bool clouds_below = false; | ||
| uniform float cloud_scale : hint_range(0.0, 1.0, 0.01) = 0.25; | ||
| uniform float speed : hint_range(0.0, 0.25, 0.001) = 0.002; | ||
| uniform float cloud_dark : hint_range(0.0, 1.0, 0.01) = 0.5; | ||
| uniform float cloud_light : hint_range(0.0, 1.0, 0.01) = 0.3; | ||
| uniform float cloud_cover : hint_range(0.0, 1.0, 0.01) = 0.2; | ||
| uniform float cloud_alpha : hint_range(0.0, 10.0, 0.01) = 8.0; | ||
| uniform float sky_tint : hint_range(0.0, 1.0, 0.001) = 0.5; | ||
| uniform float height_offset : hint_range(0.0, 1.0, 0.001) = 0.2; | ||
| uniform float sky_contribution : hint_range(0.0, 1.0, 0.1) = 0.5; | ||
| uniform sampler2D noise_texture : filter_linear, | ||
| source_color, | ||
| hint_default_black; | ||
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| const mat2 m = mat2(vec2(1.6, 1.2), vec2(-1.2, 1.6)); | ||
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| vec2 hash(vec2 p) { | ||
| p = vec2(dot(p, vec2(127.1, 311.7)), dot(p, vec2(269.5, 183.3))); | ||
| return -1.0 + 2.0 * fract(sin(p) * 43758.5453123); | ||
| } | ||
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| float noise(in vec2 p) { return texture(noise_texture, p).r; } | ||
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| float fbm(vec2 n) { | ||
| float total = 0.0, amplitude = 0.1; | ||
| total += noise(n) * amplitude; | ||
| n = m * n; | ||
| amplitude *= 0.4; | ||
| return total; | ||
| } | ||
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| void sky() { | ||
| COLOR = texture(source_panorama, SKY_COORDS).rgb; | ||
| if (AT_CUBEMAP_PASS) { | ||
| COLOR *= sky_contribution; | ||
| } else if (add_clouds) { | ||
| vec3 normal = normalize(EYEDIR); | ||
| vec3 plane_intersect = normal / (normal.y + height_offset); | ||
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| if (clouds_below) { | ||
| plane_intersect = normal / -(normal.y - height_offset); | ||
| } | ||
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| vec2 p = plane_intersect.xz; | ||
| p.y *= -1.0; | ||
| vec2 uv = p; | ||
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| float time = TIME * speed; | ||
| float q = fbm(uv * cloud_scale * 0.5); | ||
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| // ridged noise shape | ||
| float r = 0.0; | ||
| uv *= cloud_scale; | ||
| uv -= q - time; | ||
| float weight = 0.8; | ||
| r += abs(weight * noise(uv)); | ||
| uv = m * uv + time; | ||
| weight *= 0.7; | ||
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| // noise shape | ||
| float f = 0.0; | ||
| uv = p; | ||
| uv *= cloud_scale; | ||
| uv -= q - time; | ||
| weight = 0.7; | ||
| f += weight * noise(uv); | ||
| uv = m * uv + time; | ||
| weight *= 0.6; | ||
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| f *= r + f; | ||
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| // noise colour | ||
| float c = 0.0; | ||
| time = TIME * speed * 2.0; | ||
| uv = p; | ||
| uv *= cloud_scale * 2.0; | ||
| uv -= q - time; | ||
| weight = 0.4; | ||
| c += weight * noise(uv); | ||
| uv = m * uv + time; | ||
| weight *= 0.6; | ||
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| vec3 skycolour = COLOR; | ||
| vec3 cloudcolour = | ||
| vec3(1.1, 1.1, 0.9) * clamp((cloud_dark + cloud_light * c), 0.0, 1.0); | ||
| float horizon_fall_off = max(normal.y, 0.0); | ||
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| if (clouds_below) { | ||
| horizon_fall_off = max(-normal.y, 0.0); | ||
| } | ||
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| f = cloud_cover + cloud_alpha * f * r; | ||
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| vec3 result = | ||
| mix(skycolour, clamp(sky_tint * skycolour + cloudcolour, 0.0, 1.0), | ||
| clamp(f + c, 0.0, 1.0) * horizon_fall_off); | ||
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| // Convert the color to black and white. | ||
| COLOR = vec3((result.r + result.g + result.b) / 3.0); | ||
| } | ||
| } |