WIP-Commit. DOES NOT WORK.

shaders/map/fragment.shader

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+#version 330
+
+//#include "3rdParty/noise.glsl"
+
+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;
+}
+
+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) ) );
+  }
+
+
+smooth in vec3 teNormal;
+smooth in vec3 tePosition;
+smooth in float gmix;
+in vec4 teColor;
+
+out vec4 fgColor;
+
+uniform mat4 ViewMatrix;
+
+void main(void)
+{
+    //heliospheric lighting
+    vec4 light = vec4(1.0,1.0,1.0,1.0);
+    vec4 dark  = vec4(0.0,0.0,0.0,1.0);
+    //direction to sun from origin
+    vec3 lightDir = normalize(ViewMatrix * vec4(5.0,5.0,1.0,0.0)).xyz;
+
+    float costheta = dot(teNormal, lightDir);
+    float a = costheta * 0.5 + 0.5;
+
+    //create gravel-texel
+    vec3 uvw = tePosition;
+    // Six components of noise in a fractal sum
+    //float n = snoise(uvw * 10);
+    float n = 0;
+    n += 0.5 * snoise(uvw * 20.0);
+    //n += 0.25 * snoise(uvw * 40.0);
+    //n += 0.125 * snoise(uvw * 80.0);
+    //n += 0.0625 * snoise(uvw * 160.0);
+    //n += 0.03125 * snoise(uvw * 320.0);
+    n = abs(n*2);//[0,1]
+
+    //dirt
+    float d = snoise(uvw);
+    d += 0.5 * snoise(uvw * 2);
+    d += 0.25 * snoise(uvw * 4);
+    d = d/3*2 +0.5;
+
+    //                  base, dirt, noise-level*(above 0?)*(linear blend by y)
+    vec4 texBase = mix(teColor, vec4(0.45,0.27,0.1,1),d*d*step(0.01,tePosition.y)*clamp(tePosition.y/2,0,2));
+    //                  stone highlights
+    vec4 texHighlights = mix(texBase, vec4(0.9*n,0.9*n,0.9*n,1),n*n*n);
+    //mix highlights into Color with inclination, if inclination^2 > 0.35
+    vec4 texColor = mix(texBase,texHighlights, (gmix*(1-gmix))*4*(gmix*(1-gmix))*4);
+    vec4 Color = texColor;
+
+    fgColor = Color * mix(dark, light, a);
+}

shaders/map/tessControl.shader

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+#version 330
+#extension GL_ARB_tessellation_shader : require
+
+layout(vertices = 3) out;
+in vec3 vPosition[];
+in vec4 vColor[];
+in vec3 vNormal[];
+out vec3 tcPosition[];
+out vec4 tcColor[];
+out vec3 tcNormal[];
+uniform float TessLevelInner = 1.0; // controlled by keyboard buttons
+uniform float TessLevelOuter = 1.0; // controlled by keyboard buttons
+
+#define ID gl_InvocationID
+
+void main()
+{
+    tcPosition[ID] = vPosition[ID];
+    tcColor[ID] = vColor[ID];
+    tcNormal[ID] = vNormal[ID];
+    if (ID == 0) {
+        gl_TessLevelInner[0] = TessLevelInner;
+        gl_TessLevelOuter[0] = TessLevelOuter;
+        gl_TessLevelOuter[1] = TessLevelOuter;
+        gl_TessLevelOuter[2] = TessLevelOuter;
+    }
+}

shaders/map/tessEval.shader

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+#version 330
+
+#extension GL_ARB_tessellation_shader : require
+
+layout(triangles, equal_spacing, cw) in;
+in vec3 tcPosition[];
+in vec4 tcColor[];
+in vec3 tcNormal[];
+out vec4 teColor;
+smooth out vec3 tePosition;
+smooth out vec3 teNormal;
+smooth out float gmix; //mixture of gravel
+//out vec3 tePatchDistance;
+//constant projection matrix
+uniform mat4 ProjectionMatrix;
+uniform mat4 ViewMatrix;
+uniform mat3 NormalMatrix;
+
+void main()
+{
+    //NORMAL
+    vec3 n0 = gl_TessCoord.x * tcNormal[0];
+    vec3 n1 = gl_TessCoord.y * tcNormal[1];
+    vec3 n2 = gl_TessCoord.z * tcNormal[2];
+    vec3 tessNormal = normalize(n0 + n1 + n2);
+    teNormal = NormalMatrix * tessNormal;
+
+    //POSITION
+    vec3 p0 = gl_TessCoord.x * tcPosition[0];
+    vec3 p1 = gl_TessCoord.y * tcPosition[1];
+    vec3 p2 = gl_TessCoord.z * tcPosition[2];
+    tePosition = p0 + p1 + p2;
+
+    //sin(a,b) = length(cross(a,b))
+    float i0 = (1-gl_TessCoord.x)*gl_TessCoord.x * length(cross(tcNormal[0],tessNormal));
+    float i1 = (1-gl_TessCoord.y)*gl_TessCoord.y * length(cross(tcNormal[1],tessNormal));
+    float i2 = (1-gl_TessCoord.z)*gl_TessCoord.z * length(cross(tcNormal[2],tessNormal));
+    float standout = i0+i1+i2;
+    tePosition = tePosition+tessNormal*standout;
+    gl_Position = ProjectionMatrix * ViewMatrix * vec4(tePosition, 1);
+
+    //COLOR-BLENDING
+    vec4 c0 = sqrt(gl_TessCoord.x) * tcColor[0];
+    vec4 c1 = sqrt(gl_TessCoord.y) * tcColor[1];
+    vec4 c2 = sqrt(gl_TessCoord.z) * tcColor[2];
+    teColor = (c0 + c1 + c2)/(sqrt(gl_TessCoord.x)+sqrt(gl_TessCoord.y)+sqrt(gl_TessCoord.z));
+
+    //mix gravel based on incline (sin (normal,up))
+    gmix = length(cross(tessNormal, vec3(0,1,0)));
+
+}

shaders/map/vertex.shader

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+#version 330
+
+//vertex-data
+in vec4 Color;
+in vec3 Position;
+in vec3 Normal;
+
+//output-data for later stages
+out vec4 vColor;
+out vec3 vPosition;
+out vec3 vNormal;
+
+void main()
+{
+    vPosition = Position;
+    vNormal = Normal;
+    vColor = Color;
+}