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+/**
+ * @file softenLightF.glsl
+ *
+ * Copyright (c) 2007-$CurrentYear$, Linden Research, Inc.
+ * $License$
+ */
+
+#extension GL_ARB_texture_rectangle : enable
+
+uniform sampler2DRect diffuseRect;
+uniform sampler2DRect specularRect;
+uniform sampler2DRect normalMap;
+uniform sampler2DRect lightMap;
+uniform sampler2D noiseMap;
+uniform samplerCube environmentMap;
+uniform sampler2D lightFunc;
+uniform vec3 gi_quad;
+
+uniform float blur_size;
+uniform float blur_fidelity;
+
+// Inputs
+uniform vec4 morphFactor;
+uniform vec3 camPosLocal;
+//uniform vec4 camPosWorld;
+uniform vec4 gamma;
+uniform vec4 lightnorm;
+uniform vec4 sunlight_color;
+uniform vec4 ambient;
+uniform vec4 blue_horizon;
+uniform vec4 blue_density;
+uniform vec4 haze_horizon;
+uniform vec4 haze_density;
+uniform vec4 cloud_shadow;
+uniform vec4 density_multiplier;
+uniform vec4 distance_multiplier;
+uniform vec4 max_y;
+uniform vec4 glow;
+uniform float scene_light_strength;
+uniform vec3 env_mat[3];
+uniform vec4 shadow_clip;
+uniform mat3 ssao_effect_mat;
+
+uniform sampler2DRect depthMap;
+uniform mat4 inv_proj;
+uniform vec2 screen_res;
+
+varying vec4 vary_light;
+varying vec2 vary_fragcoord;
+
+vec3 vary_PositionEye;
+
+vec3 vary_SunlitColor;
+vec3 vary_AmblitColor;
+vec3 vary_AdditiveColor;
+vec3 vary_AtmosAttenuation;
+uniform float gi_ambiance;
+
+vec4 getPosition(vec2 pos_screen)
+{ //get position in screen space (world units) given window coordinate and depth map
+ float depth = texture2DRect(depthMap, pos_screen.xy).a;
+ vec2 sc = pos_screen.xy*2.0;
+ sc /= screen_res;
+ sc -= vec2(1.0,1.0);
+ vec4 ndc = vec4(sc.x, sc.y, 2.0*depth-1.0, 1.0);
+ vec4 pos = inv_proj * ndc;
+ pos /= pos.w;
+ pos.w = 1.0;
+ return pos;
+}
+
+vec3 getPositionEye()
+{
+ return vary_PositionEye;
+}
+vec3 getSunlitColor()
+{
+ return vary_SunlitColor;
+}
+vec3 getAmblitColor()
+{
+ return vary_AmblitColor;
+}
+vec3 getAdditiveColor()
+{
+ return vary_AdditiveColor;
+}
+vec3 getAtmosAttenuation()
+{
+ return vary_AtmosAttenuation;
+}
+
+
+void setPositionEye(vec3 v)
+{
+ vary_PositionEye = v;
+}
+
+void setSunlitColor(vec3 v)
+{
+ vary_SunlitColor = v;
+}
+
+void setAmblitColor(vec3 v)
+{
+ vary_AmblitColor = v;
+}
+
+void setAdditiveColor(vec3 v)
+{
+ vary_AdditiveColor = v;
+}
+
+void setAtmosAttenuation(vec3 v)
+{
+ vary_AtmosAttenuation = v;
+}
+
+void calcAtmospherics(vec3 inPositionEye, float ambFactor) {
+
+ vec3 P = inPositionEye;
+ setPositionEye(P);
+
+ //(TERRAIN) limit altitude
+ if (P.y > max_y.x) P *= (max_y.x / P.y);
+ if (P.y < -max_y.x) P *= (-max_y.x / P.y);
+
+ vec3 tmpLightnorm = lightnorm.xyz;
+
+ vec3 Pn = normalize(P);
+ float Plen = length(P);
+
+ vec4 temp1 = vec4(0);
+ vec3 temp2 = vec3(0);
+ vec4 blue_weight;
+ vec4 haze_weight;
+ vec4 sunlight = sunlight_color;
+ vec4 light_atten;
+
+ //sunlight attenuation effect (hue and brightness) due to atmosphere
+ //this is used later for sunlight modulation at various altitudes
+ light_atten = (blue_density * 1.0 + vec4(haze_density.r) * 0.25) * (density_multiplier.x * max_y.x);
+ //I had thought blue_density and haze_density should have equal weighting,
+ //but attenuation due to haze_density tends to seem too strong
+
+ temp1 = blue_density + vec4(haze_density.r);
+ blue_weight = blue_density / temp1;
+ haze_weight = vec4(haze_density.r) / temp1;
+
+ //(TERRAIN) compute sunlight from lightnorm only (for short rays like terrain)
+ temp2.y = max(0.0, tmpLightnorm.y);
+ temp2.y = 1. / temp2.y;
+ sunlight *= exp( - light_atten * temp2.y);
+
+ // main atmospheric scattering line integral
+ temp2.z = Plen * density_multiplier.x;
+
+ // Transparency (-> temp1)
+ // ATI Bugfix -- can't store temp1*temp2.z*distance_multiplier.x in a variable because the ati
+ // compiler gets confused.
+ temp1 = exp(-temp1 * temp2.z * distance_multiplier.x);
+
+ //final atmosphere attenuation factor
+ setAtmosAttenuation(temp1.rgb);
+
+ //compute haze glow
+ //(can use temp2.x as temp because we haven't used it yet)
+ temp2.x = dot(Pn, tmpLightnorm.xyz);
+ temp2.x = 1. - temp2.x;
+ //temp2.x is 0 at the sun and increases away from sun
+ temp2.x = max(temp2.x, .03); //was glow.y
+ //set a minimum "angle" (smaller glow.y allows tighter, brighter hotspot)
+ temp2.x *= glow.x;
+ //higher glow.x gives dimmer glow (because next step is 1 / "angle")
+ temp2.x = pow(temp2.x, glow.z);
+ //glow.z should be negative, so we're doing a sort of (1 / "angle") function
+
+ //add "minimum anti-solar illumination"
+ temp2.x += .25;
+
+ //increase ambient when there are more clouds
+ vec4 tmpAmbient = ambient*gi_ambiance + (vec4(1.) - ambient*gi_ambiance) * cloud_shadow.x * 0.5;
+
+ /* decrease value and saturation (that in HSV, not HSL) for occluded areas
+ * // for HSV color/geometry used here, see http://gimp-savvy.com/BOOK/index.html?node52.html
+ * // The following line of code performs the equivalent of:
+ * float ambAlpha = tmpAmbient.a;
+ * float ambValue = dot(vec3(tmpAmbient), vec3(0.577)); // projection onto <1/rt(3), 1/rt(3), 1/rt(3)>, the neutral white-black axis
+ * vec3 ambHueSat = vec3(tmpAmbient) - vec3(ambValue);
+ * tmpAmbient = vec4(RenderSSAOEffect.valueFactor * vec3(ambValue) + RenderSSAOEffect.saturationFactor *(1.0 - ambFactor) * ambHueSat, ambAlpha);
+ */
+ tmpAmbient = vec4(mix(ssao_effect_mat * tmpAmbient.rgb, tmpAmbient.rgb, ambFactor), tmpAmbient.a);
+
+ //haze color
+ setAdditiveColor(
+ vec3(blue_horizon * blue_weight * (sunlight*(1.-cloud_shadow.x) + tmpAmbient)
+ + (haze_horizon.r * haze_weight) * (sunlight*(1.-cloud_shadow.x) * temp2.x
+ + tmpAmbient)));
+
+ //brightness of surface both sunlight and ambient
+ setSunlitColor(vec3(sunlight * .5));
+ setAmblitColor(vec3(tmpAmbient * .25));
+ setAdditiveColor(getAdditiveColor() * vec3(1.0 - temp1));
+}
+
+vec3 atmosLighting(vec3 light)
+{
+ light *= getAtmosAttenuation().r;
+ light += getAdditiveColor();
+ return (2.0 * light);
+}
+
+vec3 atmosTransport(vec3 light) {
+ light *= getAtmosAttenuation().r;
+ light += getAdditiveColor() * 2.0;
+ return light;
+}
+vec3 atmosGetDiffuseSunlightColor()
+{
+ return getSunlitColor();
+}
+
+vec3 scaleDownLight(vec3 light)
+{
+ return (light / scene_light_strength );
+}
+
+vec3 scaleUpLight(vec3 light)
+{
+ return (light * scene_light_strength);
+}
+
+vec3 atmosAmbient(vec3 light)
+{
+ return getAmblitColor() + light / 2.0;
+}
+
+vec3 atmosAffectDirectionalLight(float lightIntensity)
+{
+ return getSunlitColor() * lightIntensity;
+}
+
+vec3 scaleSoftClip(vec3 light)
+{
+ //soft clip effect:
+ light = 1. - clamp(light, vec3(0.), vec3(1.));
+ light = 1. - pow(light, gamma.xxx);
+
+ return light;
+}
+
+void main()
+{
+ vec2 tc = vary_fragcoord.xy;
+ vec3 pos = getPosition(tc).xyz;
+ vec3 norm = texture2DRect(normalMap, tc).xyz*2.0-1.0;
+ //vec3 nz = texture2D(noiseMap, vary_fragcoord.xy/128.0).xyz;
+
+ float da = max(dot(norm.xyz, vary_light.xyz), 0.0);
+
+ vec4 diffuse = texture2DRect(diffuseRect, tc);
+ vec4 spec = texture2DRect(specularRect, vary_fragcoord.xy);
+
+ da = texture2D(lightFunc, vec2(da, 0.0)).a;
+
+ vec2 scol_ambocc = texture2DRect(lightMap, vary_fragcoord.xy).rg;
+ float scol = max(scol_ambocc.r, diffuse.a);
+ float ambocc = scol_ambocc.g;
+
+ calcAtmospherics(pos.xyz, ambocc);
+
+ vec3 col = atmosAmbient(vec3(0));
+ col += atmosAffectDirectionalLight(max(min(da, scol), diffuse.a));
+
+ col *= diffuse.rgb;
+
+ if (spec.a > 0.0)
+ {
+ vec3 ref = normalize(reflect(pos.xyz, norm.xyz));
+ float sa = dot(ref, vary_light.xyz);
+ col.rgb += vary_SunlitColor*scol*spec.rgb*texture2D(lightFunc, vec2(sa, spec.a)).a;
+ }
+
+ col = atmosLighting(col);
+ col = scaleSoftClip(col);
+
+ gl_FragColor.rgb = col;
+
+ //gl_FragColor.rgb = gi_col.rgb;
+ gl_FragColor.a = 0.0;
+
+ //gl_FragColor.rg = scol_ambocc.rg;
+ //gl_FragColor.rgb = texture2DRect(lightMap, vary_fragcoord.xy).rgb;
+ //gl_FragColor.rgb = norm.rgb*0.5+0.5;
+ //gl_FragColor.rgb = vec3(ambocc);
+ //gl_FragColor.rgb = vec3(scol);
+}