WS30: Add Texture rotation to ALS shader
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Stuart Buchanan
parent
9c556e5425
commit
d887e4b22d
1 changed files with 101 additions and 105 deletions
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@ -15,6 +15,7 @@ uniform sampler2DArray atlas;
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uniform sampler1D dimensionsArray;
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uniform sampler1D diffuseArray;
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uniform sampler1D specularArray;
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uniform sampler2D perlin;
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varying float yprime_alt;
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varying float mie_angle;
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@ -56,13 +57,7 @@ float luminance(vec3 color)
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void main()
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{
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// The Landclass for this particular fragment. This can be used to
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// index into the atlas textures.
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int lc = int(texture2D(landclass, gl_TexCoord[0].st).g * 255.0 + 0.5);
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vec3 shadedFogColor = vec3(0.55, 0.67, 0.88);
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vec3 shadedFogColor = vec3(0.55, 0.67, 0.88);
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// this is taken from default.frag
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vec3 n;
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float NdotL, NdotHV, fogFactor;
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@ -72,10 +67,13 @@ void main()
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vec4 fragColor;
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vec4 specular = vec4(0.0);
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float intensity;
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int lc = int(texture2D(landclass, gl_TexCoord[0].st).g * 255.0 + 0.5);
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float mat_index = float(lc)/512.0;
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float mat_shininess = texture(dimensionsArray, mat_index).z;
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vec4 mat_diffuse = texture(diffuseArray, mat_index);
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vec4 mat_specular = texture(specularArray, mat_index);
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vec4 color = mat_diffuse;
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float effective_scattering = min(scattering, cloud_self_shading);
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@ -85,8 +83,8 @@ void main()
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// If gl_Color.a == 0, this is a back-facing polygon and the
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// normal should be reversed.
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n = (2.0 * gl_Color.a - 1.0) * normal;
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n = normalize(n);
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//n = (2.0 * gl_Color.a - 1.0) * normal;
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n = normalize(normal);
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NdotL = dot(n, lightDir);
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@ -109,46 +107,56 @@ void main()
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// Different textures have different have different dimensions.
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// Dimensions array is scaled to fit in [0...1.0] in the texture1D, so has to be scaled back up here.
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// The Landclass for this particular fragment. This can be used to
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// index into the atlas textures.
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vec2 atlas_dimensions = 10000.0 * texture(dimensionsArray, float(lc)/512.0).st;
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vec2 atlas_scale = vec2(tile_width / atlas_dimensions.s, tile_height / atlas_dimensions.t );
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texel = texture(atlas, vec3(atlas_scale * gl_TexCoord[0].st, lc));
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vec2 st = atlas_scale * gl_TexCoord[0].st;
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// Rotate texture using the perlin texture as a mask to reduce tiling
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if (step(0.5, texture(perlin, atlas_scale * gl_TexCoord[0].st / 8.0).r) == 1.0) {
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st = vec2(atlas_scale.s * gl_TexCoord[0].t, atlas_scale.t * gl_TexCoord[0].s);
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}
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if (step(0.5, texture(perlin, - atlas_scale * gl_TexCoord[0].st / 16.0).r) == 1.0) {
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st = -st;
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}
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texel = texture(atlas, vec3(st, lc));
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fragColor = color * texel + specular;
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// here comes the terrain haze model
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// here comes the terrain haze model
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float delta_z = hazeLayerAltitude - eye_alt;
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float dist = length(relPos);
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float mvisibility = min(visibility,avisibility);
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if (dist > 0.04 * mvisibility)
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{
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alt = eye_alt;
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float transmission;
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float vAltitude;
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float delta_zv;
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float H;
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float distance_in_layer;
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float transmission_arg;
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// angle with horizon
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float ct = dot(vec3(0.0, 0.0, 1.0), relPos)/dist;
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float delta_z = hazeLayerAltitude - eye_alt;
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float dist = length(relPos);
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float mvisibility = min(visibility,avisibility);
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if (dist > 0.04 * mvisibility)
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{
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alt = eye_alt;
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float transmission;
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float vAltitude;
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float delta_zv;
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float H;
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float distance_in_layer;
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float transmission_arg;
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// angle with horizon
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float ct = dot(vec3(0.0, 0.0, 1.0), relPos)/dist;
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// we solve the geometry what part of the light path is attenuated normally and what is through the haze layer
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if (delta_z > 0.0) // we're inside the layer
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// we solve the geometry what part of the light path is attenuated normally and what is through the haze layer
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if (delta_z > 0.0) // we're inside the layer
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{
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if (ct < 0.0) // we look down
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{
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distance_in_layer = dist;
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vAltitude = min(distance_in_layer,mvisibility) * ct;
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delta_zv = delta_z - vAltitude;
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delta_zv = delta_z - vAltitude;
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}
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else // we may look through upper layer edge
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{
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@ -156,10 +164,10 @@ if (delta_z > 0.0) // we're inside the layer
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if (H > delta_z) {distance_in_layer = dist/H * delta_z;}
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else {distance_in_layer = dist;}
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vAltitude = min(distance_in_layer,visibility) * ct;
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delta_zv = delta_z - vAltitude;
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delta_zv = delta_z - vAltitude;
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}
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}
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else // we see the layer from above, delta_z < 0.0
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else // we see the layer from above, delta_z < 0.0
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{
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H = dist * -ct;
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if (H < (-delta_z)) // we don't see into the layer at all, aloft visibility is the only fading
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@ -175,99 +183,87 @@ if (delta_z > 0.0) // we're inside the layer
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delta_zv = vAltitude;
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}
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}
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// ground haze cannot be thinner than aloft visibility in the model,
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// so we need to use aloft visibility otherwise
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// ground haze cannot be thinner than aloft visibility in the model,
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// so we need to use aloft visibility otherwise
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transmission_arg = (dist-distance_in_layer)/avisibility;
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transmission_arg = (dist-distance_in_layer)/avisibility;
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float eqColorFactor;
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float eqColorFactor;
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if (visibility < avisibility)
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if (visibility < avisibility)
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{
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transmission_arg = transmission_arg + (distance_in_layer/visibility);
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// this combines the Weber-Fechner intensity
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eqColorFactor = 1.0 - 0.1 * delta_zv/visibility - (1.0 -effective_scattering);
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}
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else
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else
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{
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transmission_arg = transmission_arg + (distance_in_layer/avisibility);
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// this combines the Weber-Fechner intensity
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eqColorFactor = 1.0 - 0.1 * delta_zv/avisibility - (1.0 -effective_scattering);
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}
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transmission = fog_func(transmission_arg, alt);
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// there's always residual intensity, we should never be driven to zero
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if (eqColorFactor < 0.2) {eqColorFactor = 0.2;}
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float lightArg = (terminator-yprime_alt)/100000.0;
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vec3 hazeColor = get_hazeColor(lightArg);
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// now dim the light for haze
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eShade = 1.0 - 0.9 * smoothstep(-terminator_width+ terminator, terminator_width + terminator, yprime_alt);
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// Mie-like factor
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if (lightArg < 10.0)
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{intensity = length(hazeColor);
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float mie_magnitude = 0.5 * smoothstep(350000.0, 150000.0, terminator-sqrt(2.0 * EarthRadius * terrain_alt));
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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)) );
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}
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// high altitude desaturation of the haze color
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intensity = length(hazeColor);
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hazeColor = intensity * normalize (mix(hazeColor, intensity * vec3 (1.0,1.0,1.0), 0.7* smoothstep(5000.0, 50000.0, alt)));
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// blue hue of haze
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hazeColor.x = hazeColor.x * 0.83;
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hazeColor.y = hazeColor.y * 0.9;
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transmission = fog_func(transmission_arg, alt);
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// additional blue in indirect light
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float fade_out = max(0.65 - 0.3 *overcast, 0.45);
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intensity = length(hazeColor);
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hazeColor = intensity * normalize(mix(hazeColor, 1.5* shadedFogColor, 1.0 -smoothstep(0.25, fade_out,eShade) ));
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// there's always residual intensity, we should never be driven to zero
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if (eqColorFactor < 0.2) {eqColorFactor = 0.2;}
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// change haze color to blue hue for strong fogging
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//intensity = length(hazeColor);
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hazeColor = intensity * normalize(mix(hazeColor, shadedFogColor, (1.0-smoothstep(0.5,0.9,eqColorFactor))));
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float lightArg = (terminator-yprime_alt)/100000.0;
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vec3 hazeColor = get_hazeColor(lightArg);
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// reduce haze intensity when looking at shaded surfaces, only in terminator region
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float shadow = mix( min(1.0 + dot(normal,lightDir),1.0), 1.0, 1.0-smoothstep(0.1, 0.4, transmission));
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hazeColor = mix(shadow * hazeColor, hazeColor, 0.3 + 0.7* smoothstep(250000.0, 400000.0, terminator));
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// don't let the light fade out too rapidly
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lightArg = (terminator + 200000.0)/100000.0;
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float minLightIntensity = min(0.2,0.16 * lightArg + 0.5);
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vec3 minLight = minLightIntensity * vec3 (0.2, 0.3, 0.4);
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hazeColor *= eqColorFactor * eShade;
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hazeColor.rgb = max(hazeColor.rgb, minLight.rgb);
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// now dim the light for haze
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eShade = 1.0 - 0.9 * smoothstep(-terminator_width+ terminator, terminator_width + terminator, yprime_alt);
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// determine the right mix of transmission and haze
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// Mie-like factor
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if (lightArg < 10.0)
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{intensity = length(hazeColor);
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float mie_magnitude = 0.5 * smoothstep(350000.0, 150000.0, terminator-sqrt(2.0 * EarthRadius * terrain_alt));
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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)) );
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fragColor.rgb = mix(hazeColor, fragColor.rgb,transmission);
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}
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// high altitude desaturation of the haze color
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fragColor.rgb = filter_combined(fragColor.rgb);
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intensity = length(hazeColor);
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hazeColor = intensity * normalize (mix(hazeColor, intensity * vec3 (1.0,1.0,1.0), 0.7* smoothstep(5000.0, 50000.0, alt)));
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// blue hue of haze
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hazeColor.x = hazeColor.x * 0.83;
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hazeColor.y = hazeColor.y * 0.9;
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// additional blue in indirect light
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float fade_out = max(0.65 - 0.3 *overcast, 0.45);
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intensity = length(hazeColor);
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hazeColor = intensity * normalize(mix(hazeColor, 1.5* shadedFogColor, 1.0 -smoothstep(0.25, fade_out,eShade) ));
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// change haze color to blue hue for strong fogging
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//intensity = length(hazeColor);
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hazeColor = intensity * normalize(mix(hazeColor, shadedFogColor, (1.0-smoothstep(0.5,0.9,eqColorFactor))));
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// reduce haze intensity when looking at shaded surfaces, only in terminator region
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float shadow = mix( min(1.0 + dot(normal,lightDir),1.0), 1.0, 1.0-smoothstep(0.1, 0.4, transmission));
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hazeColor = mix(shadow * hazeColor, hazeColor, 0.3 + 0.7* smoothstep(250000.0, 400000.0, terminator));
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// don't let the light fade out too rapidly
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lightArg = (terminator + 200000.0)/100000.0;
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float minLightIntensity = min(0.2,0.16 * lightArg + 0.5);
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vec3 minLight = minLightIntensity * vec3 (0.2, 0.3, 0.4);
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hazeColor *= eqColorFactor * eShade;
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hazeColor.rgb = max(hazeColor.rgb, minLight.rgb);
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// determine the right mix of transmission and haze
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fragColor.rgb = mix(hazeColor, fragColor.rgb,transmission);
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}
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fragColor.rgb = filter_combined(fragColor.rgb);
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gl_FragColor = fragColor;
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gl_FragColor = fragColor;
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}
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