X-Git-Url: https://git.yukkurigames.com/?p=featherfall2.git;a=blobdiff_plain;f=src%2Fdata%2Fshaders%2Fnoise.glsl;fp=src%2Fdata%2Fshaders%2Fnoise.glsl;h=0000000000000000000000000000000000000000;hp=84944be0c380a0ccb1e74feff30133bdc0856916;hb=c6b5fcbed00096406ca526ec55f5e945d35c916a;hpb=4acf66ea4fe8765022ca84cc9ed68ad6ee7c6403 diff --git a/src/data/shaders/noise.glsl b/src/data/shaders/noise.glsl deleted file mode 100644 index 84944be..0000000 --- a/src/data/shaders/noise.glsl +++ /dev/null @@ -1,180 +0,0 @@ -// -// Description : Array and textureless GLSL 2D/3D/4D simplex -// noise functions. -// Author : Ian McEwan, Ashima Arts. -// Maintainer : ijm -// Lastmod : 20110822 (ijm) -// License : Copyright (C) 2011 Ashima Arts. All rights reserved. -// Distributed under the MIT License. See LICENSE file. -// https://github.com/ashima/webgl-noise -// -/* - Permission is hereby granted, free of charge, to any person obtaining a copy - of this software and associated documentation files (the "Software"), to deal - in the Software without restriction, including without limitation the rights - to use, copy, modify, merge, publish, distribute, sublicense, and/or sell - copies of the Software, and to permit persons to whom the Software is - furnished to do so, subject to the following conditions: - - The above copyright notice and this permission notice shall be included in - all copies or substantial portions of the Software. - - THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE - AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER - LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, - OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN - THE SOFTWARE. -*/ - -precision highp float; - -vec2 mod289(vec2 x) { - return x - floor(x * (1.0 / 289.0)) * 289.0; -} - -vec3 mod289(vec3 x) { - return x - floor(x * (1.0 / 289.0)) * 289.0; -} - -vec4 mod289(vec4 x) { - return x - floor(x * (1.0 / 289.0)) * 289.0; -} - -vec3 permute(vec3 x) { - return mod289(((x*34.0)+1.0)*x); -} - -vec4 permute(vec4 x) { - return mod289(((x*34.0)+1.0)*x); -} - -vec4 taylorInvSqrt(vec4 r) -{ - return 1.79284291400159 - 0.85373472095314 * r; -} - -float snoise(vec3 v) - { - const vec2 C = vec2(1.0/6.0, 1.0/3.0) ; - const vec4 D = vec4(0.0, 0.5, 1.0, 2.0); - -// First corner - vec3 i = floor(v + dot(v, C.yyy) ); - vec3 x0 = v - i + dot(i, C.xxx) ; - -// Other corners - vec3 g = step(x0.yzx, x0.xyz); - vec3 l = 1.0 - g; - vec3 i1 = min( g.xyz, l.zxy ); - vec3 i2 = max( g.xyz, l.zxy ); - - // x0 = x0 - 0.0 + 0.0 * C.xxx; - // x1 = x0 - i1 + 1.0 * C.xxx; - // x2 = x0 - i2 + 2.0 * C.xxx; - // x3 = x0 - 1.0 + 3.0 * C.xxx; - vec3 x1 = x0 - i1 + C.xxx; - vec3 x2 = x0 - i2 + C.yyy; // 2.0*C.x = 1/3 = C.y - vec3 x3 = x0 - D.yyy; // -1.0+3.0*C.x = -0.5 = -D.y - -// Permutations - i = mod289(i); - vec4 p = permute( permute( permute( - i.z + vec4(0.0, i1.z, i2.z, 1.0 )) - + i.y + vec4(0.0, i1.y, i2.y, 1.0 )) - + i.x + vec4(0.0, i1.x, i2.x, 1.0 )); - -// Gradients: 7x7 points over a square, mapped onto an octahedron. -// The ring size 17*17 = 289 is close to a multiple of 49 (49*6 = 294) - float n_ = 0.142857142857; // 1.0/7.0 - vec3 ns = n_ * D.wyz - D.xzx; - - vec4 j = p - 49.0 * floor(p * ns.z * ns.z); // mod(p,7*7) - - vec4 x_ = floor(j * ns.z); - vec4 y_ = floor(j - 7.0 * x_ ); // mod(j,N) - - vec4 x = x_ *ns.x + ns.yyyy; - vec4 y = y_ *ns.x + ns.yyyy; - vec4 h = 1.0 - abs(x) - abs(y); - - vec4 b0 = vec4( x.xy, y.xy ); - vec4 b1 = vec4( x.zw, y.zw ); - - //vec4 s0 = vec4(lessThan(b0,0.0))*2.0 - 1.0; - //vec4 s1 = vec4(lessThan(b1,0.0))*2.0 - 1.0; - vec4 s0 = floor(b0)*2.0 + 1.0; - vec4 s1 = floor(b1)*2.0 + 1.0; - vec4 sh = -step(h, vec4(0.0)); - - vec4 a0 = b0.xzyw + s0.xzyw*sh.xxyy ; - vec4 a1 = b1.xzyw + s1.xzyw*sh.zzww ; - - vec3 p0 = vec3(a0.xy,h.x); - vec3 p1 = vec3(a0.zw,h.y); - vec3 p2 = vec3(a1.xy,h.z); - vec3 p3 = vec3(a1.zw,h.w); - -//Normalise gradients - vec4 norm = taylorInvSqrt(vec4(dot(p0,p0), dot(p1,p1), dot(p2, p2), dot(p3,p3))); - p0 *= norm.x; - p1 *= norm.y; - p2 *= norm.z; - p3 *= norm.w; - -// Mix final noise value - vec4 m = max(0.6 - vec4(dot(x0,x0), dot(x1,x1), dot(x2,x2), dot(x3,x3)), 0.0); - m = m * m; - return 42.0 * dot( m*m, vec4( dot(p0,x0), dot(p1,x1), - dot(p2,x2), dot(p3,x3) ) ); - } - -float snoise(vec2 v) - { - const vec4 C = vec4(0.211324865405187, // (3.0-sqrt(3.0))/6.0 - 0.366025403784439, // 0.5*(sqrt(3.0)-1.0) - -0.577350269189626, // -1.0 + 2.0 * C.x - 0.024390243902439); // 1.0 / 41.0 -// First corner - vec2 i = floor(v + dot(v, C.yy) ); - vec2 x0 = v - i + dot(i, C.xx); - -// Other corners - vec2 i1; - //i1.x = step( x0.y, x0.x ); // x0.x > x0.y ? 1.0 : 0.0 - //i1.y = 1.0 - i1.x; - i1 = (x0.x > x0.y) ? vec2(1.0, 0.0) : vec2(0.0, 1.0); - // x0 = x0 - 0.0 + 0.0 * C.xx ; - // x1 = x0 - i1 + 1.0 * C.xx ; - // x2 = x0 - 1.0 + 2.0 * C.xx ; - vec4 x12 = x0.xyxy + C.xxzz; - x12.xy -= i1; - -// Permutations - i = mod289(i); // Avoid truncation effects in permutation - vec3 p = permute( permute( i.y + vec3(0.0, i1.y, 1.0 )) -+ i.x + vec3(0.0, i1.x, 1.0 )); - - vec3 m = max(0.5 - vec3(dot(x0,x0), dot(x12.xy,x12.xy), dot(x12.zw,x12.zw)), 0.0); - m = m*m ; - m = m*m ; - -// Gradients: 41 points uniformly over a line, mapped onto a diamond. -// The ring size 17*17 = 289 is close to a multiple of 41 (41*7 = 287) - - vec3 x = 2.0 * fract(p * C.www) - 1.0; - vec3 h = abs(x) - 0.5; - vec3 ox = floor(x + 0.5); - vec3 a0 = x - ox; - -// Normalise gradients implicitly by scaling m -// Approximation of: m *= inversesqrt( a0*a0 + h*h ); - m *= 1.79284291400159 - 0.85373472095314 * ( a0*a0 + h*h ); - -// Compute final noise value at P - vec3 g; - g.x = a0.x * x0.x + h.x * x0.y; - g.yz = a0.yz * x12.xz + h.yz * x12.yw; - return 130.0 * dot(m, g); -}