757 lines
23 KiB
C++
757 lines
23 KiB
C++
// WS30 FRAGMENT SHADER
|
|
|
|
// -*-C++-*-
|
|
#version 130
|
|
#extension GL_EXT_texture_array : enable
|
|
// written by Thorsten Renk, Oct 2011, based on default.frag
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////
|
|
// TEST PHASE TOGGLES AND CONTROLS
|
|
//
|
|
|
|
// Development tools:
|
|
// Reduce haze to almost zero, while preserving lighting. Useful for observing distant tiles.
|
|
// Keeps the calculation overhead. This can be used for profiling.
|
|
// Possible values: 0:Normal, 1:Reduced haze.
|
|
const int reduce_haze_without_removing_calculation_overhead = 0;
|
|
|
|
// Remove haze and lighting and shows just the texture.
|
|
// Useful for checking texture rendering and scenery.
|
|
// The compiler will likely optimise out the haze and lighting calculations.
|
|
// Possible values: 0:Normal, 1:Just the texture.
|
|
const int remove_haze_and_lighting = 0;
|
|
|
|
//
|
|
// End of test phase controls
|
|
//////////////////////////////////////////////////////////////////
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
// written by Thorsten Renk, Oct 2011, based on default.frag
|
|
// Ambient term comes in gl_Color.rgb.
|
|
varying vec4 light_diffuse_comp;
|
|
varying vec3 normal;
|
|
varying vec3 relPos;
|
|
varying vec3 rawPos;
|
|
//varying vec3 worldPos;
|
|
// Testing code:
|
|
vec3 worldPos = vec3(5000.0, 6000.0, 7000.0) + vec3(vec2(rawPos), 600.0); // vec3(100.0, 10.0, 3.0);
|
|
//varying vec2 orthoTexCoord;
|
|
varying vec4 eyePos;
|
|
|
|
|
|
uniform sampler2D landclass;
|
|
uniform sampler2DArray textureArray;
|
|
uniform sampler2D perlin;
|
|
|
|
//varying float yprime_alt;
|
|
//varying float mie_angle;
|
|
varying float steepness;
|
|
|
|
|
|
uniform float visibility;
|
|
uniform float avisibility;
|
|
uniform float scattering;
|
|
uniform float terminator;
|
|
uniform float terrain_alt;
|
|
uniform float hazeLayerAltitude;
|
|
uniform float overcast;
|
|
uniform float eye_alt;
|
|
uniform float snowlevel;
|
|
uniform float dust_cover_factor;
|
|
uniform float lichen_cover_factor;
|
|
uniform float wetness;
|
|
uniform float fogstructure;
|
|
uniform float snow_thickness_factor;
|
|
uniform float cloud_self_shading;
|
|
uniform float season;
|
|
// Used by regional definitions
|
|
uniform float transition_model;
|
|
uniform float hires_overlay_bias;
|
|
|
|
uniform int quality_level;
|
|
uniform int tquality_level;
|
|
|
|
// Passed from VPBTechnique, not the Effect
|
|
uniform bool photoScenery;
|
|
uniform vec4 dimensionsArray[128];
|
|
uniform vec4 ambientArray[128];
|
|
uniform vec4 diffuseArray[128];
|
|
uniform vec4 specularArray[128];
|
|
|
|
const float EarthRadius = 5800000.0;
|
|
const float terminator_width = 200000.0;
|
|
|
|
//Testing phase: Why are these in global scope in WS2 shaders?
|
|
float alt;
|
|
float eShade;
|
|
float yprime_alt;
|
|
float mie_angle;
|
|
|
|
float shadow_func (in float x, in float y, in float noise, in float dist);
|
|
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 SlopeLines2D(in vec2 coord, in vec2 gradDir, in float wavelength, in float steepness);
|
|
float Strata3D(in vec3 coord, in float wavelength, in float variation);
|
|
float fog_func (in float targ, in float alt);
|
|
float rayleigh_in_func(in float dist, in float air_pollution, in float avisibility, in float eye_alt, in float vertex_alt);
|
|
float alt_factor(in float eye_alt, in float vertex_alt);
|
|
float light_distance_fading(in float dist);
|
|
float fog_backscatter(in float avisibility);
|
|
|
|
vec3 rayleigh_out_shift(in vec3 color, in float outscatter);
|
|
vec3 get_hazeColor(in float light_arg);
|
|
vec3 searchlight();
|
|
vec3 landing_light(in float offset, in float offsetv);
|
|
vec3 filter_combined (in vec3 color) ;
|
|
|
|
float getShadowing();
|
|
vec3 getClusteredLightsContribution(vec3 p, vec3 n, vec3 texel);
|
|
|
|
|
|
|
|
|
|
//////////////////////////
|
|
// Test-phase code:
|
|
|
|
|
|
// These should be sent as uniforms
|
|
|
|
// Tile dimensions in meters
|
|
// vec2 tile_size = vec2(tile_width , tile_height);
|
|
// Testing: texture coords are sent flipped right now:
|
|
|
|
// Note tile_size is defined in the shader include: ws30-landclass-search-functions.frag.
|
|
// vec2 tile_size = vec2(tile_height , tile_width);
|
|
|
|
// From noise.frag
|
|
float rand2D(in vec2 co);
|
|
|
|
// These functions, and other function they depend on, are defined
|
|
// in ws30-ALS-landclass-search.frag.
|
|
|
|
|
|
// Create random landclasses without a texture lookup to stress test.
|
|
// Each square of square_size in m is assigned a random landclass value.
|
|
int get_random_landclass(in vec2 co, in vec2 tile_size);
|
|
|
|
|
|
// Lookup a ground texture at a point based on the landclass at that point, without visible
|
|
// seams at coordinate discontinuities or at landclass boundaries where texture are switched.
|
|
// The partial derivatives of the tile_coord at the fragment is needed to adjust for
|
|
// the stretching of different textures, so that the correct mip-map level is looked
|
|
// up and there are no seams.
|
|
|
|
vec4 lookup_ground_texture_array(in vec2 tile_coord, in int landclass_id, in vec2 dx, in vec2 dy);
|
|
|
|
|
|
// Look up the landclass id [0 .. 255] for this particular fragment.
|
|
// Lookup id of any neighbouring landclass that is within the search distance.
|
|
// Searches are performed in upto 4 directions right now, but only one landclass is looked up
|
|
// Create a mix factor werighting the influences of nearby landclasses
|
|
void get_landclass_id(in vec2 tile_coord,
|
|
const in float landclass_texel_size_m, in vec2 dx, in vec2 dy,
|
|
out int landclass_id, out ivec4 neighbor_landclass_ids,
|
|
out int num_unique_neighbors,out vec4 mix_factor
|
|
);
|
|
|
|
|
|
// End Test-phase code
|
|
////////////////////////
|
|
|
|
|
|
void main()
|
|
{
|
|
|
|
|
|
yprime_alt = light_diffuse_comp.a;
|
|
//diffuse_term.a = 1.0;
|
|
mie_angle = gl_Color.a;
|
|
float effective_scattering = min(scattering, cloud_self_shading);
|
|
|
|
// distance to fragment
|
|
|
|
float dist = length(relPos);
|
|
// angle of view vector with horizon
|
|
float ct = dot(vec3(0.0, 0.0, 1.0), relPos)/dist;
|
|
|
|
|
|
|
|
vec3 shadedFogColor = vec3(0.55, 0.67, 0.88);
|
|
// this is taken from default.frag
|
|
vec3 n;
|
|
float NdotL, NdotHV, fogFactor;
|
|
vec3 lightDir = gl_LightSource[0].position.xyz;
|
|
vec3 halfVector = gl_LightSource[0].halfVector.xyz;
|
|
//vec3 halfVector = normalize(normalize(lightDir) + normalize(ecViewdir));
|
|
vec4 texel;
|
|
vec4 snow_texel;
|
|
vec4 detail_texel;
|
|
vec4 mix_texel;
|
|
vec4 fragColor;
|
|
vec4 specular = vec4(0.0);
|
|
float intensity;
|
|
|
|
|
|
// get noise at different wavelengths
|
|
|
|
// used: 5m, 5m gradient, 10m, 10m gradient: heightmap of the closeup terrain, 10m also snow
|
|
// 50m: detail texel
|
|
// 250m: detail texel
|
|
// 500m: distortion and overlay
|
|
// 1500m: overlay, detail, dust, fog
|
|
// 2000m: overlay, detail, snow, fog
|
|
|
|
float noise_10m;
|
|
float noise_5m;
|
|
noise_10m = Noise2D(rawPos.xy, 10.0);
|
|
noise_5m = Noise2D(rawPos.xy ,5.0);
|
|
|
|
float noisegrad_10m;
|
|
float noisegrad_5m;
|
|
|
|
float noise_50m = Noise2D(rawPos.xy, 50.0);;
|
|
|
|
|
|
float noise_250m = Noise3D(worldPos.xyz,250.0);
|
|
float noise_500m = Noise3D(worldPos.xyz, 500.0);
|
|
float noise_1500m = Noise3D(worldPos.xyz, 1500.0);
|
|
float noise_2000m = Noise3D(worldPos.xyz, 2000.0);
|
|
|
|
|
|
|
|
//
|
|
|
|
|
|
// get the texels
|
|
|
|
// Oct 27 2021:
|
|
// Geometry is in the form of roughly rectangular 'tiles'
|
|
// with a mesh forming a grid with regular spacing.
|
|
// Each vertex in the mesh is given an elevation
|
|
|
|
// Tile dimensions in m
|
|
// Testing: created from two float uniforms in global scope. Should be sent as a vec2
|
|
// vec2 tile_size
|
|
|
|
// Tile texture coordinates range [0..1] over the tile 'rectangle'
|
|
vec2 tile_coord = gl_TexCoord[0].st;
|
|
|
|
// Test phase: Constants and toggles for transitions between landlcasses are defined at
|
|
// the top of this file.
|
|
|
|
// Look up the landclass id [0 .. 255] for this particular fragment
|
|
// and any neighbouring landclass that is close.
|
|
// Each tile has 1 texture containing landclass ids stetched over it.
|
|
|
|
// Landclass for current fragment, and up-to 4 neighboring landclasses - 2 used currently
|
|
int lc;
|
|
ivec4 lc_n;
|
|
|
|
int num_unique_neighbors = 0;
|
|
|
|
// Mix factor of base textures for 2 neighbour landclass(es)
|
|
vec4 mfact;
|
|
|
|
|
|
const float landclass_texel_size_m = 25.0;
|
|
|
|
// Partial derivatives of s and t for this fragment,
|
|
// with respect to window (screen space) x and y axes.
|
|
// Used to pick mipmap LoD levels, and turn off unneeded procedural detail
|
|
vec2 dx = dFdx(tile_coord);
|
|
vec2 dy = dFdy(tile_coord);
|
|
|
|
get_landclass_id(tile_coord, landclass_texel_size_m, dx, dy,
|
|
lc, lc_n, num_unique_neighbors, mfact);
|
|
|
|
// The landclass id is used to index into arrays containing
|
|
// material parameters and textures for the landclass as
|
|
// defined in the regional definitions
|
|
float index = float(lc)/512.0;
|
|
vec4 index_n = vec4(lc_n)/512.0;
|
|
|
|
float mat_shininess = dimensionsArray[lc].z;
|
|
vec4 mat_ambient = ambientArray[lc];
|
|
vec4 mat_diffuse = diffuseArray[lc];
|
|
vec4 mat_specular = specularArray[lc];
|
|
|
|
|
|
|
|
|
|
// Testing code:
|
|
// Use rlc even when looking up textures to recreate the extra performance hit
|
|
// so any performance difference between the two is due to the texture lookup
|
|
// color.rgb = color.rgb+0.00001*float(get_random_landclass(tile_coord.st, tile_size));
|
|
|
|
|
|
if (photoScenery) {
|
|
// In the photoscenery case we don't have landclass or materials available, so we
|
|
// just use constants for the material properties.
|
|
mat_ambient = vec4(0.2,0.2,0.2,1.0);
|
|
mat_diffuse = vec4(0.8,0.8,0.8,1.0);
|
|
mat_specular = vec4(0.0,0.0,0.0,1.0);
|
|
|
|
texel = texture(landclass, vec2(gl_TexCoord[0].s, 1.0 - gl_TexCoord[0].t));
|
|
} else {
|
|
// Color Mode is always AMBIENT_AND_DIFFUSE, which means
|
|
// using a base colour of white for ambient/diffuse,
|
|
// rather than the material color from ambientArray/diffuseArray.
|
|
mat_ambient = vec4(1.0,1.0,1.0,1.0);
|
|
mat_diffuse = vec4(1.0,1.0,1.0,1.0);
|
|
mat_specular = specularArray[lc];
|
|
mat_shininess = dimensionsArray[lc].z;
|
|
|
|
// Look up ground textures by indexing into the texture array.
|
|
// Different textures are stretched along the ground to different
|
|
// lengths along each axes as set by <xsize> and <ysize>
|
|
// regional definitions parameters
|
|
|
|
// Look up texture coordinates and scale of ground textures
|
|
// Landclass for this fragment
|
|
texel = lookup_ground_texture_array(tile_coord, lc, dx, dy);
|
|
|
|
// Mix texels - to work consistently it needs a more preceptual interpolation than mix()
|
|
if (num_unique_neighbors != 0)
|
|
{
|
|
// Closest neighbor landclass
|
|
vec4 texel_closest = lookup_ground_texture_array(tile_coord, lc_n[0], dx, dy);
|
|
|
|
// Neighbor contributions
|
|
vec4 texel_nc=texel_closest;
|
|
|
|
if (num_unique_neighbors > 1)
|
|
{
|
|
// 2nd Closest neighbor landclass
|
|
vec4 texel_2nd_closest = lookup_ground_texture_array(tile_coord, lc_n[1],
|
|
dx, dy);
|
|
|
|
texel_nc = mix(texel_closest, texel_2nd_closest, mfact[1]);
|
|
}
|
|
|
|
texel = mix(texel, texel_nc, mfact[0]);
|
|
}
|
|
}
|
|
|
|
vec4 color = gl_Color * mat_ambient;
|
|
color.a = 1.0;
|
|
|
|
// Testing code: mix with green to show values of variables at each point
|
|
//vec4 green = vec4(0.0, 0.5, 0.0, 0.0);
|
|
//texel = mix(texel, green, (mfact[2]));
|
|
|
|
// Testing code: temp
|
|
mix_texel = texel;
|
|
detail_texel = texel;
|
|
|
|
int flag = 1;
|
|
int mix_flag = 1;
|
|
|
|
|
|
float local_autumn_factor = texel.a;
|
|
|
|
if (photoScenery) {
|
|
flag = 0;
|
|
mix_flag = 0;
|
|
}
|
|
|
|
float distortion_factor = 1.0;
|
|
vec2 stprime;
|
|
|
|
float noise_term;
|
|
float snow_alpha;
|
|
|
|
//float view_angle = abs(dot(normal, normalize(ecViewdir)));
|
|
|
|
if ((quality_level > 3)&&(relPos.z + eye_alt +500.0 > snowlevel))
|
|
{
|
|
float sfactor;
|
|
snow_texel = vec4 (0.95, 0.95, 0.95, 1.0) * (0.9 + 0.1* noise_500m + 0.1* (1.0 - noise_10m) );
|
|
snow_texel.r = snow_texel.r * (0.9 + 0.05 * (noise_10m + noise_5m));
|
|
snow_texel.g = snow_texel.g * (0.9 + 0.05 * (noise_10m + noise_5m));
|
|
snow_texel.a = 1.0;
|
|
noise_term = 0.1 * (noise_500m-0.5);
|
|
sfactor = sqrt(2.0 * (1.0-steepness)/0.03) + abs(ct)/0.15;
|
|
noise_term = noise_term + 0.2 * (noise_50m -0.5) * (1.0 - smoothstep(18000.0*sfactor, 40000.0*sfactor, dist) ) ;
|
|
noise_term = noise_term + 0.3 * (noise_10m -0.5) * (1.0 - smoothstep(4000.0 * sfactor, 8000.0 * sfactor, dist) ) ;
|
|
if (dist < 3000.0*sfactor){ noise_term = noise_term + 0.3 * (noise_5m -0.5) * (1.0 - smoothstep(1000.0 * sfactor, 3000.0 *sfactor, dist) );}
|
|
snow_texel.a = snow_texel.a * 0.2+0.8* smoothstep(0.2,0.8, 0.3 +noise_term + snow_thickness_factor +0.0001*(relPos.z +eye_alt -snowlevel) );
|
|
|
|
}
|
|
|
|
if ((tquality_level > 2) && (mix_flag == 1))
|
|
{
|
|
//mix_texel = texture2D(mix_texture, gl_TexCoord[0].st * 1.3); // temp
|
|
if (mix_texel.a <0.1) {mix_flag = 0;}
|
|
}
|
|
|
|
|
|
if (tquality_level > 3 && (flag == 1))
|
|
{
|
|
stprime = vec2 (0.86*gl_TexCoord[0].s + 0.5*gl_TexCoord[0].t, 0.5*gl_TexCoord[0].s - 0.86*gl_TexCoord[0].t);
|
|
//distortion_factor = 0.9375 + (1.0 * nvL[2]);
|
|
distortion_factor = 0.97 + 0.06 * noise_500m;
|
|
stprime = stprime * distortion_factor * 15.0;
|
|
if (quality_level > 4)
|
|
{
|
|
stprime = stprime + normalize(relPos).xy * 0.02 * (noise_10m + 0.5 * noise_5m - 0.75);
|
|
}
|
|
//detail_texel = texture2D(detail_texture, stprime); // temp
|
|
if (detail_texel.a <0.1) {flag = 0;}
|
|
}
|
|
|
|
|
|
// texture preparation according to detail level
|
|
|
|
// mix in hires texture patches
|
|
|
|
float dist_fact;
|
|
float nSum;
|
|
float mix_factor;
|
|
|
|
if (tquality_level > 2)
|
|
{
|
|
// first the second texture overlay
|
|
// transition model 0: random patch overlay without any gradient information
|
|
// transition model 1: only gradient-driven transitions, no randomness
|
|
|
|
|
|
if (mix_flag == 1)
|
|
{
|
|
nSum = 0.18 * (2.0 * noise_2000m + 2.0 * noise_1500m + noise_500m);
|
|
nSum = mix(nSum, 0.5, max(0.0, 2.0 * (transition_model - 0.5)));
|
|
nSum = nSum + 0.4 * (1.0 -smoothstep(0.9,0.95, abs(steepness)+ 0.05 * (noise_50m - 0.5))) * min(1.0, 2.0 * transition_model);
|
|
mix_factor = smoothstep(0.5, 0.54, nSum);
|
|
texel = mix(texel, mix_texel, mix_factor);
|
|
local_autumn_factor = texel.a;
|
|
}
|
|
|
|
// then the detail texture overlay
|
|
}
|
|
|
|
if (tquality_level > 3)
|
|
{
|
|
if (dist < 40000.0)
|
|
{
|
|
if (flag == 1)
|
|
{
|
|
//noise_50m = Noise2D(rawPos.xy, 50.0);
|
|
//noise_250m = Noise2D(rawPos.xy, 250.0);
|
|
dist_fact = 0.1 * smoothstep(15000.0,40000.0, dist) - 0.03 * (1.0 - smoothstep(500.0,5000.0, dist));
|
|
nSum = ((1.0 -noise_2000m) + noise_1500m + 2.0 * noise_250m +noise_50m)/5.0;
|
|
nSum = nSum - 0.08 * (1.0 -smoothstep(0.9,0.95, abs(steepness)));
|
|
mix_factor = smoothstep(0.47, 0.54, nSum +hires_overlay_bias - dist_fact);
|
|
if (mix_factor > 0.8) {mix_factor = 0.8;}
|
|
texel = mix(texel, detail_texel,mix_factor);
|
|
local_autumn_factor = texel.a;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
// autumn colors
|
|
|
|
float autumn_factor = season * 2.0 * (1.0 - local_autumn_factor) ;
|
|
|
|
|
|
texel.r = min(1.0, (1.0 + 2.5 * autumn_factor) * texel.r);
|
|
texel.g = texel.g;
|
|
texel.b = max(0.0, (1.0 - 4.0 * autumn_factor) * texel.b);
|
|
|
|
|
|
if (local_autumn_factor < 1.0)
|
|
{
|
|
intensity = length(texel.rgb) * (1.0 - 0.5 * smoothstep(1.1,2.0,season));
|
|
texel.rgb = intensity * normalize(mix(texel.rgb, vec3(0.23,0.17,0.08), smoothstep(1.1,2.0, season)));
|
|
}
|
|
|
|
|
|
|
|
const vec4 dust_color = vec4 (0.76, 0.71, 0.56, 1.0);
|
|
const vec4 lichen_color = vec4 (0.17, 0.20, 0.06, 1.0);;
|
|
//float snow_alpha;
|
|
|
|
if (quality_level > 3)
|
|
{
|
|
|
|
// mix vegetation
|
|
texel = mix(texel, lichen_color, 0.4 * lichen_cover_factor + 0.8 * lichen_cover_factor * 0.5 * (noise_10m + (1.0 - noise_5m)) );
|
|
// mix dust
|
|
texel = mix(texel, dust_color, clamp(0.5 * dust_cover_factor + 3.0 * dust_cover_factor * (((noise_1500m - 0.5) * 0.125)+0.125 ),0.0, 1.0) );
|
|
|
|
// mix snow
|
|
if (relPos.z + eye_alt +500.0 > snowlevel)
|
|
{
|
|
snow_alpha = smoothstep(0.75, 0.85, abs(steepness));
|
|
//texel = mix(texel, snow_texel, texel_snow_fraction);
|
|
texel = mix(texel, snow_texel, snow_texel.a* smoothstep(snowlevel, snowlevel+200.0, snow_alpha * (relPos.z + eye_alt)+ (noise_2000m + 0.1 * noise_10m -0.55) *400.0));
|
|
}
|
|
}
|
|
else if (relPos.z + eye_alt +500.0 > snowlevel)
|
|
{
|
|
float snow_alpha = 0.5+0.5* smoothstep(0.2,0.8, 0.3 + snow_thickness_factor +0.0001*(relPos.z +eye_alt -snowlevel) );
|
|
// texel = vec4(dot(vec3(0.2989, 0.5870, 0.1140), texel.rgb));
|
|
texel = mix(texel, vec4(1.0), snow_alpha* smoothstep(snowlevel, snowlevel+200.0, (relPos.z + eye_alt)));
|
|
}
|
|
|
|
|
|
|
|
// get distribution of water when terrain is wet
|
|
|
|
float water_threshold1;
|
|
float water_threshold2;
|
|
float water_factor =0.0;
|
|
|
|
|
|
if ((dist < 5000.0)&& (quality_level > 3) && (wetness>0.0))
|
|
{
|
|
water_threshold1 = 1.0-0.5* wetness;
|
|
water_threshold2 = 1.0 - 0.3 * wetness;
|
|
water_factor = smoothstep(water_threshold1, water_threshold2 , (0.3 * (2.0 * (1.0-noise_10m) + (1.0 -noise_5m)) * (1.0 - smoothstep(2000.0, 5000.0, dist))) - 5.0 * (1.0 -steepness));
|
|
}
|
|
|
|
// darken wet terrain
|
|
|
|
texel.rgb = texel.rgb * (1.0 - 0.6 * wetness);
|
|
|
|
|
|
// light computations
|
|
|
|
|
|
vec4 light_specular = gl_LightSource[0].specular;
|
|
|
|
// If gl_Color.a == 0, this is a back-facing polygon and the
|
|
// normal should be reversed.
|
|
//n = (2.0 * gl_Color.a - 1.0) * normal;
|
|
n = normal;//vec3 (nvec.x, nvec.y, sqrt(1.0 -pow(nvec.x,2.0) - pow(nvec.y,2.0) ));
|
|
n = normalize(n);
|
|
|
|
NdotL = dot(n, lightDir);
|
|
if ((tquality_level > 3) && (mix_flag ==1)&& (dist < 2000.0) && (quality_level > 4))
|
|
{
|
|
noisegrad_10m = (noise_10m - Noise2D(rawPos.xy+ 0.05 * normalize(lightDir.xy),10.0))/0.05;
|
|
noisegrad_5m = (noise_5m - Noise2D(rawPos.xy+ 0.05 * normalize(lightDir.xy),5.0))/0.05;
|
|
NdotL = NdotL + 1.0 * (noisegrad_10m + 0.5* noisegrad_5m) * mix_factor/0.8 * (1.0 - smoothstep(1000.0, 2000.0, dist));
|
|
}
|
|
|
|
|
|
if (NdotL > 0.0) {
|
|
float shadowmap = getShadowing();
|
|
vec4 diffuse_term = light_diffuse_comp * mat_diffuse;
|
|
color += diffuse_term * NdotL * shadowmap;
|
|
NdotHV = max(dot(n, halfVector), 0.0);
|
|
if (mat_shininess > 0.0)
|
|
specular.rgb = (mat_specular.rgb
|
|
* light_specular.rgb
|
|
* pow(NdotHV, mat_shininess)
|
|
* shadowmap);
|
|
}
|
|
color.a = 1.0;//diffuse_term.a;
|
|
// This shouldn't be necessary, but our lighting becomes very
|
|
// saturated. Clamping the color before modulating by the texture
|
|
// is closer to what the OpenGL fixed function pipeline does.
|
|
color = clamp(color, 0.0, 1.0);
|
|
|
|
|
|
|
|
|
|
fragColor = color * texel + specular;
|
|
fragColor.rgb += getClusteredLightsContribution(eyePos.xyz, n, texel.rgb);
|
|
|
|
// here comes the terrain haze model
|
|
|
|
float delta_z = hazeLayerAltitude - eye_alt;
|
|
|
|
|
|
if (dist > 0.04 * min(visibility,avisibility))
|
|
//if ((gl_FragCoord.y > ylimit) || (gl_FragCoord.x < zlimit1) || (gl_FragCoord.x > zlimit2))
|
|
//if (dist > 40.0)
|
|
{
|
|
|
|
alt = eye_alt;
|
|
|
|
|
|
float transmission;
|
|
float vAltitude;
|
|
float delta_zv;
|
|
float H;
|
|
float distance_in_layer;
|
|
float transmission_arg;
|
|
|
|
|
|
|
|
|
|
// we solve the geometry what part of the light path is attenuated normally and what is through the haze layer
|
|
|
|
if (delta_z > 0.0) // we're inside the layer
|
|
{
|
|
if (ct < 0.0) // we look down
|
|
{
|
|
distance_in_layer = dist;
|
|
vAltitude = min(distance_in_layer,min(visibility, avisibility)) * ct;
|
|
delta_zv = delta_z - vAltitude;
|
|
}
|
|
else // we may look through upper layer edge
|
|
{
|
|
H = dist * ct;
|
|
if (H > delta_z) {distance_in_layer = dist/H * delta_z;}
|
|
else {distance_in_layer = dist;}
|
|
vAltitude = min(distance_in_layer,visibility) * ct;
|
|
delta_zv = delta_z - vAltitude;
|
|
}
|
|
}
|
|
else // we see the layer from above, delta_z < 0.0
|
|
{
|
|
H = dist * -ct;
|
|
if (H < (-delta_z)) // we don't see into the layer at all, aloft visibility is the only fading
|
|
{
|
|
distance_in_layer = 0.0;
|
|
delta_zv = 0.0;
|
|
}
|
|
else
|
|
{
|
|
vAltitude = H + delta_z;
|
|
distance_in_layer = vAltitude/H * dist;
|
|
vAltitude = min(distance_in_layer,visibility) * (-ct);
|
|
delta_zv = vAltitude;
|
|
}
|
|
}
|
|
|
|
|
|
// ground haze cannot be thinner than aloft visibility in the model,
|
|
// so we need to use aloft visibility otherwise
|
|
transmission_arg = (dist-distance_in_layer)/avisibility;
|
|
|
|
float eqColorFactor;
|
|
|
|
|
|
|
|
if (visibility < avisibility)
|
|
{
|
|
if (quality_level > 3)
|
|
{
|
|
transmission_arg = transmission_arg + (distance_in_layer/(1.0 * visibility + 1.0 * visibility * fogstructure * 0.06 * (noise_1500m + noise_2000m -1.0) ));
|
|
|
|
}
|
|
else
|
|
{
|
|
transmission_arg = transmission_arg + (distance_in_layer/visibility);
|
|
}
|
|
// this combines the Weber-Fechner intensity
|
|
eqColorFactor = 1.0 - 0.1 * delta_zv/visibility - (1.0 - effective_scattering);
|
|
|
|
}
|
|
else
|
|
{
|
|
if (quality_level > 3)
|
|
{
|
|
transmission_arg = transmission_arg + (distance_in_layer/(1.0 * avisibility + 1.0 * avisibility * fogstructure * 0.06 * (noise_1500m + noise_2000m - 1.0) ));
|
|
}
|
|
else
|
|
{
|
|
transmission_arg = transmission_arg + (distance_in_layer/avisibility);
|
|
}
|
|
// this combines the Weber-Fechner intensity
|
|
eqColorFactor = 1.0 - 0.1 * delta_zv/avisibility - (1.0 - effective_scattering);
|
|
}
|
|
|
|
transmission = fog_func(transmission_arg, alt);
|
|
|
|
// there's always residual intensity, we should never be driven to zero
|
|
if (eqColorFactor < 0.2) eqColorFactor = 0.2;
|
|
|
|
|
|
float lightArg = (terminator-yprime_alt)/100000.0;
|
|
vec3 hazeColor = get_hazeColor(lightArg);
|
|
|
|
// now dim the light for haze
|
|
eShade = 1.0 - 0.9 * smoothstep(-terminator_width+ terminator, terminator_width + terminator, yprime_alt);
|
|
|
|
|
|
// Mie-like factor
|
|
|
|
if (lightArg < 10.0)
|
|
{
|
|
intensity = length(hazeColor);
|
|
float mie_magnitude = 0.5 * smoothstep(350000.0, 150000.0, terminator-sqrt(2.0 * EarthRadius * terrain_alt));
|
|
hazeColor = intensity * ((1.0 - mie_magnitude) + mie_magnitude * mie_angle) * normalize(mix(hazeColor, vec3 (0.5, 0.58, 0.65), mie_magnitude * (0.5 - 0.5 * mie_angle)) );
|
|
}
|
|
|
|
intensity = length(hazeColor);
|
|
|
|
if (intensity > 0.0) // this needs to be a condition, because otherwise hazeColor doesn't come out correctly
|
|
{
|
|
|
|
|
|
// high altitude desaturation of the haze color
|
|
hazeColor = intensity * normalize (mix(hazeColor, intensity * vec3 (1.0,1.0,1.0), 0.7* smoothstep(5000.0, 50000.0, alt)));
|
|
|
|
// blue hue of haze
|
|
|
|
hazeColor.x = hazeColor.x * 0.83;
|
|
hazeColor.y = hazeColor.y * 0.9;
|
|
|
|
|
|
// additional blue in indirect light
|
|
float fade_out = max(0.65 - 0.3 *overcast, 0.45);
|
|
intensity = length(hazeColor);
|
|
hazeColor = intensity * normalize(mix(hazeColor, 1.5* shadedFogColor, 1.0 -smoothstep(0.25, fade_out,eShade) ));
|
|
|
|
// change haze color to blue hue for strong fogging
|
|
|
|
hazeColor = intensity * normalize(mix(hazeColor, shadedFogColor, (1.0-smoothstep(0.5,0.9,eqColorFactor))));
|
|
|
|
|
|
|
|
// reduce haze intensity when looking at shaded surfaces, only in terminator region
|
|
float shadow = mix( min(1.0 + dot(n,lightDir),1.0), 1.0, 1.0-smoothstep(0.1, 0.4, transmission));
|
|
hazeColor = mix(shadow * hazeColor, hazeColor, 0.3 + 0.7* smoothstep(250000.0, 400000.0, terminator));
|
|
|
|
// don't let the light fade out too rapidly
|
|
lightArg = (terminator + 200000.0)/100000.0;
|
|
float minLightIntensity = min(0.2,0.16 * lightArg + 0.5);
|
|
vec3 minLight = minLightIntensity * vec3 (0.2, 0.3, 0.4);
|
|
hazeColor *= eqColorFactor * eShade;
|
|
hazeColor.rgb = max(hazeColor.rgb, minLight.rgb);
|
|
|
|
}
|
|
|
|
|
|
// Testing phase controls
|
|
if (reduce_haze_without_removing_calculation_overhead == 1)
|
|
{
|
|
transmission = 1.0 - (transmission/1000000.0);
|
|
}
|
|
|
|
fragColor.rgb = mix(clamp(hazeColor,0.0,1.0) , clamp(fragColor.rgb,0.0,1.0),transmission);
|
|
|
|
}
|
|
|
|
fragColor.rgb = filter_combined(fragColor.rgb);
|
|
|
|
gl_FragColor = fragColor;
|
|
|
|
|
|
|
|
// Testing phase controls:
|
|
if (remove_haze_and_lighting == 1)
|
|
{
|
|
gl_FragColor = texel;
|
|
}
|
|
|
|
|
|
|
|
}
|