264 lines
7.4 KiB
GLSL
264 lines
7.4 KiB
GLSL
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#version 330 core
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in vec3 pos;
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in vec3 interpolatedNormal;
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in vec2 st;
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uniform float time;
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uniform sampler2D tex;
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uniform mat4 rotMat;
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uniform vec3 lightPos;
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uniform vec3 eyePosition;
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//vec3 lightPos = vec3(0.0, 4.0, 2.0);
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vec3 LightColor = vec3(0.9,0.9,0.9);
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float LightPower = 1.0;
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//out vec4 finalcolor;
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out vec4 color;
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// Authors : Ian McEwan, Ashima Arts and Stefan Gustavson, LiU.
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// noise functions
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vec3 mod289(vec3 x) {
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return x - floor(x * (1.0 / 289.0)) * 289.0;
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}
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vec4 mod289(vec4 x) {
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return x - floor(x * (1.0 / 289.0)) * 289.0;
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}
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vec4 permute(vec4 x) {
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return mod289(((x*34.0)+1.0)*x);
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}
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vec4 taylorInvSqrt(vec4 r)
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{
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return 1.79284291400159 - 0.85373472095314 * r;
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}
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// 3-D simplex noise
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//
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float snoise(vec3 v)
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{
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const vec2 C = vec2(1.0/6.0, 1.0/3.0) ;
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const vec4 D = vec4(0.0, 0.5, 1.0, 2.0);
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// First corner
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vec3 i = floor(v + dot(v, C.yyy) );
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vec3 x0 = v - i + dot(i, C.xxx) ;
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// Other corners
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vec3 g = step(x0.yzx, x0.xyz);
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vec3 l = 1.0 - g;
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vec3 i1 = min( g.xyz, l.zxy );
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vec3 i2 = max( g.xyz, l.zxy );
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// x0 = x0 - 0.0 + 0.0 * C.xxx;
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// x1 = x0 - i1 + 1.0 * C.xxx;
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// x2 = x0 - i2 + 2.0 * C.xxx;
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// x3 = x0 - 1.0 + 3.0 * C.xxx;
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vec3 x1 = x0 - i1 + C.xxx;
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vec3 x2 = x0 - i2 + C.yyy; // 2.0*C.x = 1/3 = C.y
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vec3 x3 = x0 - D.yyy; // -1.0+3.0*C.x = -0.5 = -D.y
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// Permutations
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i = mod289(i);
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vec4 p = permute( permute( permute(
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i.z + vec4(0.0, i1.z, i2.z, 1.0 ))
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+ i.y + vec4(0.0, i1.y, i2.y, 1.0 ))
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+ i.x + vec4(0.0, i1.x, i2.x, 1.0 ));
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// Gradients: 7x7 points over a square, mapped onto an octahedron.
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// The ring size 17*17 = 289 is close to a multiple of 49 (49*6 = 294)
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float n_ = 0.142857142857; // 1.0/7.0
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vec3 ns = n_ * D.wyz - D.xzx;
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vec4 j = p - 49.0 * floor(p * ns.z * ns.z); // mod(p,7*7)
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vec4 x_ = floor(j * ns.z);
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vec4 y_ = floor(j - 7.0 * x_ ); // mod(j,N)
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vec4 x = x_ *ns.x + ns.yyyy;
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vec4 y = y_ *ns.x + ns.yyyy;
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vec4 h = 1.0 - abs(x) - abs(y);
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vec4 b0 = vec4( x.xy, y.xy );
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vec4 b1 = vec4( x.zw, y.zw );
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//vec4 s0 = vec4(lessThan(b0,0.0))*2.0 - 1.0;
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//vec4 s1 = vec4(lessThan(b1,0.0))*2.0 - 1.0;
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vec4 s0 = floor(b0)*2.0 + 1.0;
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vec4 s1 = floor(b1)*2.0 + 1.0;
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vec4 sh = -step(h, vec4(0.0));
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vec4 a0 = b0.xzyw + s0.xzyw*sh.xxyy ;
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vec4 a1 = b1.xzyw + s1.xzyw*sh.zzww ;
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vec3 p0 = vec3(a0.xy,h.x);
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vec3 p1 = vec3(a0.zw,h.y);
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vec3 p2 = vec3(a1.xy,h.z);
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vec3 p3 = vec3(a1.zw,h.w);
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//Normalise gradients
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vec4 norm = taylorInvSqrt(vec4(dot(p0,p0), dot(p1,p1), dot(p2, p2), dot(p3,p3)));
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p0 *= norm.x;
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p1 *= norm.y;
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p2 *= norm.z;
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p3 *= norm.w;
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// Mix final noise value
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vec4 m = max(0.6 - vec4(dot(x0,x0), dot(x1,x1), dot(x2,x2), dot(x3,x3)), 0.0);
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m = m * m;
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return 42.0 * dot( m*m, vec4( dot(p0,x0), dot(p1,x1),
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dot(p2,x2), dot(p3,x3) ) );
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}
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// 3-D simplex noise with gradient
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// (analytical partial derivatives in x,y,z)
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//
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float snoise(vec3 v, out vec3 gradient)
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{
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const vec2 C = vec2(1.0/6.0, 1.0/3.0) ;
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const vec4 D = vec4(0.0, 0.5, 1.0, 2.0);
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// First corner
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vec3 i = floor(v + dot(v, C.yyy) );
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vec3 x0 = v - i + dot(i, C.xxx) ;
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// Other corners
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vec3 g = step(x0.yzx, x0.xyz);
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vec3 l = 1.0 - g;
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vec3 i1 = min( g.xyz, l.zxy );
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vec3 i2 = max( g.xyz, l.zxy );
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// x0 = x0 - 0.0 + 0.0 * C.xxx;
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// x1 = x0 - i1 + 1.0 * C.xxx;
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// x2 = x0 - i2 + 2.0 * C.xxx;
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// x3 = x0 - 1.0 + 3.0 * C.xxx;
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vec3 x1 = x0 - i1 + C.xxx;
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vec3 x2 = x0 - i2 + C.yyy; // 2.0*C.x = 1/3 = C.y
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vec3 x3 = x0 - D.yyy; // -1.0+3.0*C.x = -0.5 = -D.y
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// Permutations
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i = mod289(i);
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vec4 p = permute( permute( permute(
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i.z + vec4(0.0, i1.z, i2.z, 1.0 ))
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+ i.y + vec4(0.0, i1.y, i2.y, 1.0 ))
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+ i.x + vec4(0.0, i1.x, i2.x, 1.0 ));
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// Gradients: 7x7 points over a square, mapped onto an octahedron.
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// The ring size 17*17 = 289 is close to a multiple of 49 (49*6 = 294)
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float n_ = 0.142857142857; // 1.0/7.0
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vec3 ns = n_ * D.wyz - D.xzx;
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vec4 j = p - 49.0 * floor(p * ns.z * ns.z); // mod(p,7*7)
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vec4 x_ = floor(j * ns.z);
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vec4 y_ = floor(j - 7.0 * x_ ); // mod(j,N)
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vec4 x = x_ *ns.x + ns.yyyy;
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vec4 y = y_ *ns.x + ns.yyyy;
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vec4 h = 1.0 - abs(x) - abs(y);
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vec4 b0 = vec4( x.xy, y.xy );
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vec4 b1 = vec4( x.zw, y.zw );
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//vec4 s0 = vec4(lessThan(b0,0.0))*2.0 - 1.0;
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//vec4 s1 = vec4(lessThan(b1,0.0))*2.0 - 1.0;
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vec4 s0 = floor(b0)*2.0 + 1.0;
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vec4 s1 = floor(b1)*2.0 + 1.0;
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vec4 sh = -step(h, vec4(0.0));
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vec4 a0 = b0.xzyw + s0.xzyw*sh.xxyy ;
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vec4 a1 = b1.xzyw + s1.xzyw*sh.zzww ;
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vec3 p0 = vec3(a0.xy,h.x);
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vec3 p1 = vec3(a0.zw,h.y);
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vec3 p2 = vec3(a1.xy,h.z);
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vec3 p3 = vec3(a1.zw,h.w);
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//Normalise gradients
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vec4 norm = taylorInvSqrt(vec4(dot(p0,p0), dot(p1,p1), dot(p2, p2), dot(p3,p3)));
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p0 *= norm.x;
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p1 *= norm.y;
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p2 *= norm.z;
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p3 *= norm.w;
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// Mix final noise value
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vec4 m = max(0.6 - vec4(dot(x0,x0), dot(x1,x1), dot(x2,x2), dot(x3,x3)), 0.0);
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vec4 m2 = m * m;
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vec4 m4 = m2 * m2;
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vec4 pdotx = vec4(dot(p0,x0), dot(p1,x1), dot(p2,x2), dot(p3,x3));
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// Determine noise gradient
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vec4 temp = m2 * m * pdotx;
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gradient = -8.0 * (temp.x * x0 + temp.y * x1 + temp.z * x2 + temp.w * x3);
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gradient += m4.x * p0 + m4.y * p1 + m4.z * p2 + m4.w * p3;
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gradient *= 42.0;
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return 42.0 * dot(m4, pdotx);
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}
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// main
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void main () {
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//vec4 light = vec4(1.0, 10.0, 0.0, 0.1);
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vec4 light = vec4(lightPos, 1);
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//light = light*rotMat;
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vec3 colorBlue = vec3(0.0,0.1,0.3);
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vec3 colorLightBlue = vec3(0.0, 0.04, 0.2);
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vec3 colorWhite = vec3(0.9, 0.9, 0.9);
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// Bump map surface
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vec3 grad = vec3(0.0); // To store gradient of noise
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vec3 gradtemp = vec3(0.0); // Temporary gradient for fractal sum
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float bump = 0.2 * snoise(2*pos, grad) + 0.5;
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grad *= 0.4; // Scale gradient with inner derivative
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bump += 0.5 * snoise(pos*4.0, gradtemp);
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grad += 2.0 * gradtemp; // Same influence (double freq, half amp)
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bump += 0.25 * snoise(pos*10.0, gradtemp);
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grad += 4.0 * gradtemp; // Same influence (double freq, half amp)
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// Perturb normal
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vec3 perturbation = grad - dot(grad, interpolatedNormal) * interpolatedNormal;
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vec3 norm = interpolatedNormal - 0.2 * perturbation;
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vec3 ballPos = vec3(0.0, 0.0, -0.1);
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ballPos += vec3(0.0, sin(ballPos.z - 2.0*time)/15.0 + cos(ballPos.x + time)/25, 0.0);
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vec3 shadow = vec3(0.0,0.0,0.0);
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// fake shadow
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if( length(pos.xyz-ballPos) < 0.1)
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LightPower = 0.1;
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// Material properties
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vec3 MaterialDiffuseColor = mix(colorBlue, colorLightBlue, 0.5);
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vec3 MaterialAmbientColor = vec3(0.3,0.3,0.3) * MaterialDiffuseColor;
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vec3 MaterialSpecularColor = vec3(0.9,0.9,0.9);
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// Distance to the light
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float distance = length(vec3(light) - pos);
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// Normal of the computed fragment, in camera space
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vec3 n = normalize(norm);
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// Direction of the light (from the fragment to the light)
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vec3 l = normalize(vec3(light)-pos);
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// Cosine of the angle between the normal and the light direction,
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float cosTheta = clamp( dot( n,l ), 0,1 );
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// Eye vector (towards the camera)
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vec3 E = normalize(eyePosition - pos);
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// Direction in which the triangle reflects the light
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vec3 R = -reflect(l,n);
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// Cosine of the angle between the Eye vector and the Reflect vector,
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float cosAlpha = clamp( dot( E,R ), 0,1 );
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color = vec4(pow(vec3(MaterialAmbientColor
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+ MaterialDiffuseColor * LightColor * LightPower * pow(cosTheta,2) / (distance*0.1)
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+ MaterialSpecularColor * LightColor * LightPower * pow(cosAlpha,100.0) / (distance*0.1) ), vec3(1.0/2.2)), 0.5);
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}
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