diff options
Diffstat (limited to 'indra/newview/app_settings/shaders/class1/windlight/atmosphericsFuncs.glsl')
| -rw-r--r-- | indra/newview/app_settings/shaders/class1/windlight/atmosphericsFuncs.glsl | 168 |
1 files changed, 74 insertions, 94 deletions
diff --git a/indra/newview/app_settings/shaders/class1/windlight/atmosphericsFuncs.glsl b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsFuncs.glsl index dcb02bd1c1..ea2690ba09 100644 --- a/indra/newview/app_settings/shaders/class1/windlight/atmosphericsFuncs.glsl +++ b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsFuncs.glsl @@ -1,154 +1,134 @@ -/** +/** * @file class1\windlight\atmosphericsFuncs.glsl * * $LicenseInfo:firstyear=2005&license=viewerlgpl$ * Second Life Viewer Source Code * Copyright (C) 2019, Linden Research, Inc. - * + * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; * version 2.1 of the License only. - * + * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. - * + * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - * + * * Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA * $/LicenseInfo$ */ -uniform vec4 lightnorm; -uniform vec4 sunlight_color; -uniform vec4 moonlight_color; -uniform int sun_up_factor; -uniform vec4 ambient_color; -uniform vec4 blue_horizon; -uniform vec4 blue_density; +uniform vec4 lightnorm; +uniform vec4 sunlight_color; +uniform vec4 moonlight_color; +uniform int sun_up_factor; +uniform vec4 ambient_color; +uniform vec4 blue_horizon; +uniform vec4 blue_density; uniform float haze_horizon; uniform float haze_density; uniform float cloud_shadow; uniform float density_multiplier; uniform float distance_multiplier; uniform float max_y; -uniform vec4 glow; +uniform vec4 glow; uniform float scene_light_strength; -uniform mat3 ssao_effect_mat; -uniform int no_atmo; +uniform mat3 ssao_effect_mat; +uniform int no_atmo; uniform float sun_moon_glow_factor; -float getAmbientClamp() +float getAmbientClamp() { return 1.0f; } + +void calcAtmosphericVars(vec3 inPositionEye, vec3 light_dir, float ambFactor, out vec3 sunlit, out vec3 amblit, out vec3 additive, + out vec3 atten, bool use_ao) { - return 1.0f; -} + vec3 rel_pos = inPositionEye; + //(TERRAIN) limit altitude + if (abs(rel_pos.y) > max_y) rel_pos *= (max_y / rel_pos.y); -void calcAtmosphericVars(vec3 inPositionEye, vec3 light_dir, float ambFactor, out vec3 sunlit, out vec3 amblit, out vec3 additive, out vec3 atten, bool use_ao) { + vec3 rel_pos_norm = normalize(rel_pos); + float rel_pos_len = length(rel_pos); + vec4 sunlight = (sun_up_factor == 1) ? sunlight_color : moonlight_color; - vec3 P = inPositionEye; - - //(TERRAIN) limit altitude - if (P.y > max_y) P *= (max_y / P.y); - if (P.y < -max_y) P *= (-max_y / P.y); + // sunlight attenuation effect (hue and brightness) due to atmosphere + // this is used later for sunlight modulation at various altitudes + vec4 light_atten = (blue_density + vec4(haze_density * 0.25)) * (density_multiplier * max_y); + // I had thought blue_density and haze_density should have equal weighting, + // but attenuation due to haze_density tends to seem too strong - vec3 tmpLightnorm = lightnorm.xyz; + vec4 combined_haze = blue_density + vec4(haze_density); + vec4 blue_weight = blue_density / combined_haze; + vec4 haze_weight = vec4(haze_density) / combined_haze; - vec3 Pn = normalize(P); - float Plen = length(P); + //(TERRAIN) compute sunlight from lightnorm y component. Factor is roughly cosecant(sun elevation) (for short rays like terrain) + float above_horizon_factor = 1.0 / max(1e-6, lightnorm.y); + sunlight *= exp(-light_atten * above_horizon_factor); // for sun [horizon..overhead] this maps to an exp curve [0..1] + + // main atmospheric scattering line integral + float density_dist = rel_pos_len * density_multiplier; - vec4 temp1 = vec4(0); - vec3 temp2 = vec3(0); - vec4 blue_weight; - vec4 haze_weight; - vec4 sunlight = (sun_up_factor == 1) ? sunlight_color : moonlight_color; - vec4 light_atten; + // Transparency (-> combined_haze) + // ATI Bugfix -- can't store combined_haze*density_dist*distance_multiplier in a variable because the ati + // compiler gets confused. + combined_haze = exp(-combined_haze * density_dist * distance_multiplier); - float dens_mul = density_multiplier; - float dist_mul = distance_multiplier; + // final atmosphere attenuation factor + atten = combined_haze.rgb; - //sunlight attenuation effect (hue and brightness) due to atmosphere - //this is used later for sunlight modulation at various altitudes - light_atten = (blue_density + vec4(haze_density * 0.25)) * (dens_mul * max_y); - //I had thought blue_density and haze_density should have equal weighting, - //but attenuation due to haze_density tends to seem too strong + // compute haze glow + float haze_glow = dot(rel_pos_norm, lightnorm.xyz); - temp1 = blue_density + vec4(haze_density); - blue_weight = blue_density / temp1; - haze_weight = vec4(haze_density) / temp1; + // dampen sun additive contrib when not facing it... + // SL-13539: This "if" clause causes an "additive" white artifact at roughly 77 degreees. + // if (length(light_dir) > 0.01) + haze_glow *= max(0.0f, dot(light_dir, rel_pos_norm)); - //(TERRAIN) compute sunlight from lightnorm only (for short rays like terrain) - temp2.y = max(0.0, tmpLightnorm.y); - if (abs(temp2.y) > 0.000001f) - { - temp2.y = 1. / abs(temp2.y); - } - temp2.y = max(0.0000001f, temp2.y); - sunlight *= exp(-light_atten * temp2.y); + haze_glow = 1. - haze_glow; + // haze_glow is 0 at the sun and increases away from sun + haze_glow = max(haze_glow, .001); // set a minimum "angle" (smaller glow.y allows tighter, brighter hotspot) + haze_glow *= glow.x; + // higher glow.x gives dimmer glow (because next step is 1 / "angle") + haze_glow = pow(haze_glow, glow.z); + // glow.z should be negative, so we're doing a sort of (1 / "angle") function - // main atmospheric scattering line integral - temp2.z = Plen * dens_mul; + // add "minimum anti-solar illumination" + haze_glow += .25; - // Transparency (-> temp1) - // ATI Bugfix -- can't store temp1*temp2.z*dist_mul in a variable because the ati - // compiler gets confused. - temp1 = exp(-temp1 * temp2.z * dist_mul); + haze_glow *= sun_moon_glow_factor; - //final atmosphere attenuation factor - atten = temp1.rgb; - - //compute haze glow - //(can use temp2.x as temp because we haven't used it yet) - temp2.x = dot(Pn, tmpLightnorm.xyz); + vec4 amb_color = ambient_color; - // dampen sun additive contrib when not facing it... - if (length(light_dir) > 0.01) - { - temp2.x *= max(0.0f, dot(light_dir, Pn)); - } - temp2.x = 1. - temp2.x; - //temp2.x is 0 at the sun and increases away from sun - temp2.x = max(temp2.x, .001); //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; - - temp2.x *= sun_moon_glow_factor; - - vec4 amb_color = ambient_color; - - //increase ambient when there are more clouds + // increase ambient when there are more clouds vec4 tmpAmbient = amb_color + (vec4(1.) - amb_color) * cloud_shadow * 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(RenderSSAOEffect.valueFactor * vec3(ambValue) + RenderSSAOEffect.saturationFactor *(1.0 - ambFactor) * ambHueSat, + * ambAlpha); */ if (use_ao) { tmpAmbient = vec4(mix(ssao_effect_mat * tmpAmbient.rgb, tmpAmbient.rgb, ambFactor), tmpAmbient.a); } - //haze color - additive = - vec3(blue_horizon * blue_weight * (sunlight*(1.-cloud_shadow) + tmpAmbient) - + (haze_horizon * haze_weight) * (sunlight*(1.-cloud_shadow) * temp2.x - + tmpAmbient)); + // Similar/Shared Algorithms: + // indra\llinventory\llsettingssky.cpp -- LLSettingsSky::calculateLightSettings() + // indra\newview\app_settings\shaders\class1\windlight\atmosphericsFuncs.glsl -- calcAtmosphericVars() + // haze color + vec3 cs = sunlight.rgb * (1. - cloud_shadow); + additive = (blue_horizon.rgb * blue_weight.rgb) * (cs + tmpAmbient.rgb) + (haze_horizon * haze_weight.rgb) * (cs * haze_glow + tmpAmbient.rgb); - //brightness of surface both sunlight and ambient + // brightness of surface both sunlight and ambient sunlit = sunlight.rgb * 0.5; amblit = tmpAmbient.rgb * .25; - additive *= vec3(1.0 - temp1); + additive *= vec3(1.0 - combined_haze); } |