219 lines
8.5 KiB
GLSL
219 lines
8.5 KiB
GLSL
// This shader is mostly an adaptation of the shader found at
|
|
// http://www.bonzaisoftware.com/water_tut.html and its glsl conversion
|
|
// available at http://forum.bonzaisoftware.com/viewthread.php?tid=10
|
|
// © Michael Horsch - 2005
|
|
// Major update and revisions - 2011-10-07
|
|
// © Emilian Huminiuc and Vivian Meazza
|
|
|
|
#version 120
|
|
|
|
uniform sampler2D water_normalmap;
|
|
uniform sampler2D water_reflection;
|
|
uniform sampler2D water_dudvmap;
|
|
uniform sampler2D water_reflection_grey;
|
|
uniform sampler2D sea_foam;
|
|
uniform sampler2D perlin_normalmap;
|
|
|
|
uniform float saturation, Overcast, WindE, WindN;
|
|
uniform float CloudCover0, CloudCover1, CloudCover2, CloudCover3, CloudCover4;
|
|
uniform float osg_SimulationTime;
|
|
uniform int Status;
|
|
|
|
varying vec4 waterTex1; //moving texcoords
|
|
varying vec4 waterTex2; //moving texcoords
|
|
varying vec4 waterTex4; //viewts
|
|
varying vec4 ecPosition;
|
|
varying vec3 viewerdir;
|
|
varying vec3 lightdir;
|
|
varying vec3 normal;
|
|
|
|
uniform float WaveFreq ;
|
|
uniform float WaveAmp ;
|
|
uniform float WaveSharp ;
|
|
|
|
////fog "include" /////
|
|
uniform int fogType;
|
|
|
|
vec3 fog_Func(vec3 color, int type);
|
|
//////////////////////
|
|
|
|
/////// functions /////////
|
|
|
|
void rotationmatrix(in float angle, out mat4 rotmat)
|
|
{
|
|
rotmat = mat4( cos( angle ), -sin( angle ), 0.0, 0.0,
|
|
sin( angle ), cos( angle ), 0.0, 0.0,
|
|
0.0 , 0.0 , 1.0, 0.0,
|
|
0.0 , 0.0 , 0.0, 1.0 );
|
|
}
|
|
|
|
void main(void)
|
|
{
|
|
const vec4 sca = vec4(0.005, 0.005, 0.005, 0.005);
|
|
const vec4 sca2 = vec4(0.02, 0.02, 0.02, 0.02);
|
|
const vec4 tscale = vec4(0.25, 0.25, 0.25, 0.25);
|
|
|
|
mat4 RotationMatrix;
|
|
// compute direction to viewer
|
|
vec3 E = normalize(viewerdir);
|
|
|
|
// compute direction to light source
|
|
vec3 L = normalize(lightdir);
|
|
|
|
// half vector
|
|
vec3 H = normalize(L + E);
|
|
|
|
vec3 Normal = normalize(normal);
|
|
|
|
const float water_shininess = 240.0;
|
|
|
|
// approximate cloud cover
|
|
float cover = 0.0;
|
|
//bool Status = true;
|
|
|
|
|
|
float windEffect = sqrt(pow(abs(WindE),2)+pow(abs(WindN),2)) * 0.6; //wind speed in kt
|
|
float windScale = 15.0/(3.0 + windEffect); //wave scale
|
|
float windEffect_low = 0.3 + 0.7 * smoothstep(0.0, 5.0, windEffect); //low windspeed wave filter
|
|
float waveRoughness = 0.05 + smoothstep(0.0, 20.0, windEffect); //wave roughness filter
|
|
|
|
float mixFactor = 0.75 - 0.15 * smoothstep(0.0, 40.0, windEffect);
|
|
mixFactor = clamp(mixFactor, 0.3, 0.8);
|
|
|
|
if (Status == 1){
|
|
cover = min(min(min(min(CloudCover0, CloudCover1),CloudCover2),CloudCover3),CloudCover4);
|
|
} else {
|
|
// hack to allow for Overcast not to be set by Local Weather
|
|
if (Overcast == 0){
|
|
cover = 5;
|
|
} else {
|
|
cover = Overcast * 5;
|
|
}
|
|
}
|
|
|
|
vec4 viewt = normalize(waterTex4);
|
|
|
|
vec4 disdis = texture2D(water_dudvmap, vec2(waterTex2 * tscale)* windScale) * 2.0 - 1.0;
|
|
|
|
vec4 dist = texture2D(water_dudvmap, vec2(waterTex1 + disdis*sca2)* windScale) * 2.0 - 1.0;
|
|
dist *= (0.6 + 0.5 * smoothstep(0.0, 15.0, windEffect));
|
|
vec4 fdist = normalize(dist);
|
|
fdist = -fdist; //dds fix
|
|
fdist *= sca;
|
|
|
|
//normalmaps
|
|
rotationmatrix(radians(3.0 * windScale + 0.6 * sin(waterTex1.s * 0.2)), RotationMatrix);
|
|
vec4 nmap = texture2D(water_normalmap, vec2(waterTex1* RotationMatrix + disdis * sca2) * windScale) * 2.0 - 1.0;
|
|
vec4 nmap1 = texture2D(perlin_normalmap, vec2(waterTex1/** RotationMatrix*/ + disdis * sca2) * windScale) * 2.0 - 1.0;
|
|
|
|
rotationmatrix(radians(-2.0 * windScale -0.4 * sin(waterTex1.s * 0.32)), RotationMatrix);
|
|
nmap += texture2D(water_normalmap, vec2(waterTex1* RotationMatrix + disdis * sca2) * windScale * 1.5) * 2.0 - 1.0;
|
|
//nmap1 += texture2D(perlin_normalmap, vec2(waterTex1* RotationMatrix + disdis * sca2) * windScale) * 2.0 - 1.0;
|
|
rotationmatrix(radians(1.5 * windScale + 0.3 * sin(waterTex1.s * 0.16)), RotationMatrix);
|
|
nmap += texture2D(water_normalmap, vec2(waterTex1* RotationMatrix + disdis * sca2) * windScale * 2.1) * 2.0 - 1.0;
|
|
rotationmatrix(radians(-0.5 * windScale - 0.45 * sin(waterTex1.s * 0.28)), RotationMatrix);
|
|
nmap += texture2D(water_normalmap, vec2(waterTex1* RotationMatrix + disdis * sca2) * windScale * 0.8) * 2.0 - 1.0;
|
|
|
|
rotationmatrix(radians(-1.2 * windScale - 0.35 * sin(waterTex1.s * 0.28)), RotationMatrix);
|
|
nmap += texture2D(water_normalmap, vec2(waterTex2 * RotationMatrix* tscale) * windScale * 1.7) * 2.0 - 1.0;
|
|
nmap1 += texture2D(perlin_normalmap, vec2(waterTex2/** RotationMatrix*/ * tscale) * windScale) * 2.0 - 1.0;
|
|
|
|
nmap *= windEffect_low;
|
|
nmap1 *= windEffect_low;
|
|
// mix water and noise, modulated by factor
|
|
vec4 vNorm = normalize(mix(nmap, nmap1, mixFactor) * waveRoughness);
|
|
//vNorm.r += ddx;
|
|
vNorm = -vNorm; //dds fix
|
|
|
|
//load reflection
|
|
vec4 tmp = vec4(lightdir, 0.0);
|
|
vec4 refTex;
|
|
vec4 refl;
|
|
// cover = 0;
|
|
|
|
if(cover >= 1.5){
|
|
refTex = texture2D(water_reflection, vec2(tmp));
|
|
refl= normalize(refTex);
|
|
} else {
|
|
refTex = texture2D(water_reflection_grey, vec2(tmp));
|
|
refl = normalize(refTex);
|
|
refl.r *= (0.75 + 0.15 * cover);
|
|
refl.g *= (0.80 + 0.15 * cover);
|
|
refl.b *= (0.875 + 0.125 * cover);
|
|
refl.a *= 1.0;
|
|
}
|
|
|
|
rotationmatrix(radians(2.1* windScale + 0.25 * sin(waterTex1.s *0.14)), RotationMatrix);
|
|
vec3 N0 = vec3(texture2D(water_normalmap, vec2(waterTex1* RotationMatrix + disdis * sca2) * windScale * 1.15) * 2.0 - 1.0);
|
|
vec3 N1 = vec3(texture2D(perlin_normalmap, vec2(waterTex1/** RotationMatrix*/ + disdis * sca) * windScale) * 2.0 - 1.0);
|
|
|
|
rotationmatrix(radians(-1.5 * windScale -0.32 * sin(waterTex1.s *0.24)), RotationMatrix);
|
|
N0 += vec3(texture2D(water_normalmap, vec2(waterTex2* RotationMatrix * tscale) * windScale * 1.8) * 2.0 - 1.0);
|
|
N1 += vec3(texture2D(perlin_normalmap, vec2(waterTex2/** RotationMatrix*/ * tscale) * windScale) * 2.0 - 1.0);
|
|
|
|
rotationmatrix(radians(3.8 * windScale + 0.45 * sin(waterTex1.s *0.32)), RotationMatrix);
|
|
N0 += vec3(texture2D(water_normalmap, vec2(waterTex2 * RotationMatrix * (tscale + sca2)) * windScale * 0.85) * 2.0 - 1.0);
|
|
N1 += vec3(texture2D(perlin_normalmap, vec2(waterTex2/** RotationMatrix*/ * (tscale + sca2)) * windScale) * 2.0 - 1.0);
|
|
|
|
rotationmatrix(radians(-2.8 * windScale - 0.38 * sin(waterTex1.s * 0.26)), RotationMatrix);
|
|
N0 += vec3(texture2D(water_normalmap, vec2(waterTex1 * RotationMatrix + disdis * sca2) * windScale * 2.1) * 2.0 - 1.0);
|
|
N1 += vec3(texture2D(perlin_normalmap, vec2(waterTex1 /** RotationMatrix*/ + disdis * sca) * windScale) * 2.0 - 1.0);
|
|
|
|
N0 *= windEffect_low;
|
|
N1 *= windEffect_low;
|
|
|
|
vec3 N = normalize(mix(Normal + N0, Normal + N1, mixFactor) * waveRoughness);
|
|
//N.r += ddx;
|
|
//N.g += ddy;
|
|
|
|
N = -N; //dds fix
|
|
|
|
// specular
|
|
vec3 specular_color = vec3(gl_LightSource[0].diffuse)
|
|
* pow(max(0.0, dot(N, H)), water_shininess) * 6.0;
|
|
vec4 specular = vec4(specular_color, 0.5);
|
|
|
|
specular = specular * saturation * 0.3 ;
|
|
|
|
//calculate fresnel
|
|
vec4 invfres = vec4( dot(vNorm, viewt) );
|
|
vec4 fres = vec4(1.0) + invfres;
|
|
refl *= fres;
|
|
|
|
//calculate the fog factor
|
|
// float fogFactor;
|
|
// float fogCoord = ecPosition.z;
|
|
// const float LOG2 = 1.442695;
|
|
// fogFactor = exp2(-gl_Fog.density * gl_Fog.density * fogCoord * fogCoord * LOG2);
|
|
//
|
|
// if(gl_Fog.density == 1.0)
|
|
// fogFactor=1.0;
|
|
|
|
//calculate final colour
|
|
vec4 ambient_light = gl_LightSource[0].diffuse;
|
|
vec4 finalColor;
|
|
|
|
if(cover >= 1.5){
|
|
finalColor = refl + specular;
|
|
} else {
|
|
finalColor = refl;
|
|
}
|
|
|
|
float foamSlope = 0.10 + 0.1 * windScale;
|
|
//float waveSlope = mix(N0.g, N1.g, 0.25);
|
|
|
|
vec4 foam_texel = texture2D(sea_foam, vec2(waterTex2 * tscale) * 25.0);
|
|
float waveSlope = N.g;
|
|
|
|
if (windEffect >= 8.0)
|
|
if (waveSlope >= foamSlope){
|
|
finalColor = mix(finalColor, max(finalColor, finalColor + foam_texel), smoothstep(0.01, 0.50, N.g));
|
|
}
|
|
|
|
|
|
finalColor *= ambient_light;
|
|
|
|
//gl_FragColor = mix(gl_Fog.color, finalColor, fogFactor);
|
|
finalColor.rgb = fog_Func(finalColor.rgb, fogType);
|
|
gl_FragColor = finalColor;
|
|
}
|