fly/fgdata
1
0
Fork 0
Code Activity

ALS terrain shader uses noise library

Browse source
This commit is contained in:
Thorsten Renk 2014-04-17 12:23:45 +03:00
parent b1d909b22e
commit 4ea8047b69
2 changed files with 9 additions and 116 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
Effects/terrain-default.eff
View file

@ -290,6 +290,7 @@
<program>
<vertex-shader>Shaders/terrain-haze-ultra.vert</vertex-shader>
<fragment-shader>Shaders/terrain-haze-ultra.frag</fragment-shader>
<fragment-shader>Shaders/noise.frag</fragment-shader>
<fragment-shader>Shaders/cloud-shadowfunc.frag</fragment-shader>
</program>
<uniform>

124
Shaders/terrain-haze-ultra.frag
View file

@ -69,120 +69,12 @@ float yprime_alt;
float mie_angle;
float shadow_func (in float x, in float y, in float noise, in float dist);
float rand2D(in vec2 co){
return fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453);
}
float rand3D(in vec3 co){
return fract(sin(dot(co.xyz ,vec3(12.9898,78.233,144.7272))) * 43758.5453);
}
float cosine_interpolate(in float a, in float b, in float x)
{
float ft = x * 3.1415927;
float f = (1.0 - cos(ft)) * .5;
return a*(1.0-f) + b*f;
}
float simple_interpolate(in float a, in float b, in float x)
{
return a + smoothstep(0.0,1.0,x) * (b-a);
}
float interpolatedNoise2D(in float x, in float y)
{
float integer_x = x - fract(x);
float fractional_x = x - integer_x;
float integer_y = y - fract(y);
float fractional_y = y - integer_y;
float v1 = rand2D(vec2(integer_x, integer_y));
float v2 = rand2D(vec2(integer_x+1.0, integer_y));
float v3 = rand2D(vec2(integer_x, integer_y+1.0));
float v4 = rand2D(vec2(integer_x+1.0, integer_y +1.0));
float i1 = simple_interpolate(v1 , v2 , fractional_x);
float i2 = simple_interpolate(v3 , v4 , fractional_x);
return simple_interpolate(i1 , i2 , fractional_y);
}
float interpolatedNoise3D(in float x, in float y, in float z)
{
float integer_x = x - fract(x);
float fractional_x = x - integer_x;
float integer_y = y - fract(y);
float fractional_y = y - integer_y;
float integer_z = z - fract(z);
float fractional_z = z - integer_z;
float v1 = rand3D(vec3(integer_x, integer_y, integer_z));
float v2 = rand3D(vec3(integer_x+1.0, integer_y, integer_z));
float v3 = rand3D(vec3(integer_x, integer_y+1.0, integer_z));
float v4 = rand3D(vec3(integer_x+1.0, integer_y +1.0, integer_z));
float v5 = rand3D(vec3(integer_x, integer_y, integer_z+1.0));
float v6 = rand3D(vec3(integer_x+1.0, integer_y, integer_z+1.0));
float v7 = rand3D(vec3(integer_x, integer_y+1.0, integer_z+1.0));
float v8 = rand3D(vec3(integer_x+1.0, integer_y +1.0, integer_z+1.0));
float DotNoise2D(in vec2 coord, in float wavelength, in float fractionalMaxDotSize, in float dot_density);
float Noise2D(in vec2 coord, in float wavelength);
float Noise3D(in vec3 coord, in float wavelength);
float VoronoiNoise2D(in vec2 coord, in float wavelength, in float xrand, in float yrand);
float i1 = simple_interpolate(v1,v5, fractional_z);
float i2 = simple_interpolate(v2,v6, fractional_z);
float i3 = simple_interpolate(v3,v7, fractional_z);
float i4 = simple_interpolate(v4,v8, fractional_z);
float ii1 = simple_interpolate(i1,i2,fractional_x);
float ii2 = simple_interpolate(i3,i4,fractional_x);
return simple_interpolate(ii1 , ii2 , fractional_y);
}
float Noise2D(in vec2 coord, in float wavelength)
{
return interpolatedNoise2D(coord.x/wavelength, coord.y/wavelength);
}
float Noise3D(in vec3 coord, in float wavelength)
{
return interpolatedNoise3D(coord.x/wavelength, coord.y/wavelength, coord.z/wavelength);
}
float dotNoise2D(in float x, in float y, in float fractionalMaxDotSize)
{
float integer_x = x - fract(x);
float fractional_x = x - integer_x;
float integer_y = y - fract(y);
float fractional_y = y - integer_y;
if (rand2D(vec2(integer_x+1.0, integer_y +1.0)) > dot_density)
{return 0.0;}
float xoffset = (rand2D(vec2(integer_x, integer_y)) -0.5);
float yoffset = (rand2D(vec2(integer_x+1.0, integer_y)) - 0.5);
float dotSize = 0.5 * fractionalMaxDotSize * max(0.25,rand2D(vec2(integer_x, integer_y+1.0)));
vec2 truePos = vec2 (0.5 + xoffset * (1.0 - 2.0 * dotSize) , 0.5 + yoffset * (1.0 -2.0 * dotSize));
float distance = length(truePos - vec2(fractional_x, fractional_y));
return 1.0 - smoothstep (0.3 * dotSize, 1.0* dotSize, distance);
}
float DotNoise2D(in vec2 coord, in float wavelength, in float fractionalMaxDotSize)
{
return dotNoise2D(coord.x/wavelength, coord.y/wavelength, fractionalMaxDotSize);
}
@ -339,9 +231,9 @@ float noise_2000m = Noise3D(worldPos.xyz, 2000.0);
// dot noise
float dotnoise_2m = DotNoise2D(rawPos.xy, 2.0 * dot_size,0.5);
float dotnoise_10m = DotNoise2D(rawPos.xy, 10.0 * dot_size, 0.5);
float dotnoise_15m = DotNoise2D(rawPos.xy, 15.0 * dot_size, 0.33);
float dotnoise_2m = DotNoise2D(rawPos.xy, 2.0 * dot_size,0.5, dot_density);
float dotnoise_10m = DotNoise2D(rawPos.xy, 10.0 * dot_size, 0.5, dot_density);
float dotnoise_15m = DotNoise2D(rawPos.xy, 15.0 * dot_size, 0.33, dot_density);
float dotnoisegrad_10m;
@ -540,7 +432,7 @@ if ((dist < 5000.0)&& (quality_level > 3) && (combined_wetness>0.0))
noisegrad_2m = (noise_2m - Noise2D(rawPos.xy+ 0.05 * normalize(lightDir.xy),2.0))/0.05;
noisegrad_1m = (noise_1m - Noise2D(rawPos.xy+ 0.05 * normalize(lightDir.xy),1.0))/0.05;
dotnoisegrad_10m = (dotnoise_10m - DotNoise2D(rawPos.xy+ 0.05 * normalize(lightDir.xy),10.0 * dot_size,0.5))/0.05;
dotnoisegrad_10m = (dotnoise_10m - DotNoise2D(rawPos.xy+ 0.05 * normalize(lightDir.xy),10.0 * dot_size,0.5, dot_density))/0.05;
NdotL = NdotL + (noisegrad_10m * detail_fade(10.0, view_angle,dist) + 0.5* noisegrad_5m * detail_fade(5.0, view_angle,dist)) * mix_factor/0.8;