2020-02-13 08:38:43 +01:00
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"global": "float rand31(vec3 p) {\n\treturn fract(sin(dot(p,vec3(127.1,311.7, 74.7)))*43758.5453123);\n}\nvec3 rand33(vec3 p){\n\tp = vec3( dot(p,vec3(127.1,311.7, 74.7)),\n\t\t\t dot(p,vec3(269.5,183.3,246.1)),\n\t\t\t dot(p,vec3(113.5,271.9,124.6)));\n\n\treturn -1.0 + 2.0*fract(sin(p)*43758.5453123);\n}\n\nfloat tex3d_fbm_value(vec3 coord, vec3 size, float seed) {\n\tvec3 o = floor(coord)+rand3(vec2(float(seed), 1.0-float(seed)))+size;\n\tvec3 f = fract(coord);\n\tfloat p000 = rand31(mod(o, size));\n\tfloat p001 = rand31(mod(o + vec3(0.0, 0.0, 1.0), size));\n\tfloat p010 = rand31(mod(o + vec3(0.0, 1.0, 0.0), size));\n\tfloat p011 = rand31(mod(o + vec3(0.0, 1.0, 1.0), size));\n\tfloat p100 = rand31(mod(o + vec3(1.0, 0.0, 0.0), size));\n\tfloat p101 = rand31(mod(o + vec3(1.0, 0.0, 1.0), size));\n\tfloat p110 = rand31(mod(o + vec3(1.0, 1.0, 0.0), size));\n\tfloat p111 = rand31(mod(o + vec3(1.0, 1.0, 1.0), size));\n\tvec3 t = f * f * (3.0 - 2.0 * f);\n\treturn mix(mix(mix(p000, p100, t.x), mix(p010, p110, t.x), t.y), mix(mix(p001, p101, t.x), mix(p011, p111, t.x), t.y), t.z);\n}\n\nfloat tex3d_fbm_perlin(vec3 coord, vec3 size, float seed) {\n\tvec3 o = floor(coord)+rand3(vec2(float(seed), 1.0-float(seed)))+size;\n\tvec3 f = fract(coord);\n\tvec3 v000 = normalize(rand33(mod(o, size))-vec3(0.5));\n\tvec3 v001 = normalize(rand33(mod(o + vec3(0.0, 0.0, 1.0), size))-vec3(0.5));\n\tvec3 v010 = normalize(rand33(mod(o + vec3(0.0, 1.0, 0.0), size))-vec3(0.5));\n\tvec3 v011 = normalize(rand33(mod(o + vec3(0.0, 1.0, 1.0), size))-vec3(0.5));\n\tvec3 v100 = normalize(rand33(mod(o + vec3(1.0, 0.0, 0.0), size))-vec3(0.5));\n\tvec3 v101 = normalize(rand33(mod(o + vec3(1.0, 0.0, 1.0), size))-vec3(0.5));\n\tvec3 v110 = normalize(rand33(mod(o + vec3(1.0, 1.0, 0.0), size))-vec3(0.5));\n\tvec3 v111 = normalize(rand33(mod(o + vec3(1.0, 1.0, 1.0), size))-vec3(0.5));\n\tfloat p000 = dot(v000, f);\n\tfloat p001 = dot(v001, f - vec3(0.0, 0.0, 1.0));\n\tfloat p010 = dot(v010, f - vec3(0.0, 1.0, 0.0));\n\tfloat p011 = dot(v011, f - vec3(0.0, 1.0, 1.0));\n\tfloat p100 = dot(v100, f - vec3(1.0, 0.0, 0.0));\n\tfloat p101 = dot(v101, f - vec3(1.0, 0.0, 1.0));\n\tfloat p110 = dot(v110, f - vec3(1.0, 1.0, 0.0));\n\tfloat p111 = dot(v111, f - vec3(1.0, 1.0, 1.0));\n\tvec3 t = f * f * (3.0 - 2.0 * f);\n\treturn 0.5 + mix(mix(mix(p000, p100, t.x), mix(p010, p110, t.x), t.y), mix(mix(p001, p101, t.x), mix(p011, p111, t.x), t.y), t.z);\n}\n\nfloat tex3d_fbm_cellular(vec3 coord, vec3 size, float seed) {\n\tvec3 o = floor(coord)+rand3(vec2(float(seed), 1.0-float(seed)))+size;\n\tvec3 f = fract(coord);\n\tfloat min_dist = 3.0;\n\tfor (float x = -1.0; x <= 1.0; x++) {\n\t\tfor (float y = -1.0; y <= 1.0; y++) {\n\t\t\tfor (float z = -1.0; z <= 1.0; z++) {\n\t\t\t\tvec3 node = 0.4*rand33(mod(o + vec3(x, y, z), size)) + vec3(x, y, z);\n\t\t\t\tfloat dist = sqrt((f - node).x * (f - node).x + (f - node).y * (f - node).y + (f - node).z * (f - node).z);\n\t\t\t\tmin_dist = min(min_dist, dist);\n\t\t\t}\n\t\t}\n\t}\n\treturn min_dist;\n}\n",
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