diff options
| -rw-r--r-- | indra/newview/app_settings/shaders/class2/deferred/skyF.glsl | 149 |
1 files changed, 65 insertions, 84 deletions
diff --git a/indra/newview/app_settings/shaders/class2/deferred/skyF.glsl b/indra/newview/app_settings/shaders/class2/deferred/skyF.glsl index 1dce85a83b..1485c515a4 100644 --- a/indra/newview/app_settings/shaders/class2/deferred/skyF.glsl +++ b/indra/newview/app_settings/shaders/class2/deferred/skyF.glsl @@ -1,24 +1,24 @@ -/** +/** * @file class2/deferred/skyF.glsl * * $LicenseInfo:firstyear=2005&license=viewerlgpl$ * Second Life Viewer Source Code * Copyright (C) 2005, 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 * $/LicenseInfo$ */ @@ -32,13 +32,13 @@ uniform mat4 modelview_projection_matrix; // Inputs uniform vec3 camPosLocal; -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; @@ -47,7 +47,7 @@ uniform float density_multiplier; uniform float distance_multiplier; uniform float max_y; -uniform vec4 glow; +uniform vec4 glow; uniform float sun_moon_glow_factor; uniform vec4 cloud_color; @@ -73,16 +73,16 @@ uniform float ice_level; vec3 rainbow(float d) { - d = clamp(d, -1.0, 0.0); - float rad = (droplet_radius - 5.0f) / 1024.0f; - return pow(texture2D(rainbow_map, vec2(rad, d)).rgb, vec3(1.8)) * moisture_level; + d = clamp(d, -1.0, 0.0); + float rad = (droplet_radius - 5.0f) / 1024.0f; + return pow(texture2D(rainbow_map, vec2(rad, d)).rgb, vec3(1.8)) * moisture_level; } vec3 halo22(float d) { - d = clamp(d, 0.1, 1.0); - float v = sqrt(clamp(1 - (d * d), 0, 1)); - return texture2D(halo_map, vec2(0, v)).rgb * ice_level; + d = clamp(d, 0.1, 1.0); + float v = sqrt(clamp(1 - (d * d), 0, 1)); + return texture2D(halo_map, vec2(0, v)).rgb * ice_level; } /// Soft clips the light with a gamma correction @@ -90,115 +90,96 @@ vec3 scaleSoftClip(vec3 light); void main() { - // World / view / projection - // Get relative position - vec3 P = pos.xyz - camPosLocal.xyz + vec3(0,50,0); + // Get relative position (offset why?) + vec3 rel_pos = pos.xyz - camPosLocal.xyz + vec3(0, 50, 0); - // Set altitude - if (P.y > 0.) + // Adj position vector to clamp altitude + if (rel_pos.y > 0.) { - P *= (max_y / P.y); + rel_pos *= (max_y / rel_pos.y); } - else + if (rel_pos.y < 0.) { - P *= (-32000. / P.y); + rel_pos *= (-32000. / rel_pos.y); } - // Can normalize then - vec3 Pn = normalize(P); - float Plen = length(P); + // Normalized + vec3 rel_pos_norm = normalize(rel_pos); + float rel_pos_len = length(rel_pos); // Initialize temp variables - vec4 temp1 = vec4(0.); - vec4 temp2 = vec4(0.); - vec4 blue_weight; - vec4 haze_weight; vec4 sunlight = (sun_up_factor == 1) ? sunlight_color : moonlight_color; - vec4 light_atten; - - float dens_mul = density_multiplier; // 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); + vec4 light_atten = (blue_density + vec4(haze_density * 0.25)) * (density_multiplier * max_y); // Calculate relative weights - temp1 = abs(blue_density) + vec4(abs(haze_density)); - blue_weight = blue_density / temp1; - haze_weight = haze_density / temp1; + vec4 combined_haze = abs(blue_density) + vec4(abs(haze_density)); + vec4 blue_weight = blue_density / combined_haze; + vec4 haze_weight = haze_density / combined_haze; - // Compute sunlight from P & lightnorm (for long rays like sky) - temp2.y = max(0., max(0., Pn.y) * 1.0 + lightnorm.y ); - temp2.y = 1. / temp2.y; - sunlight *= exp( - light_atten * temp2.y); + // Compute sunlight from rel_pos & lightnorm (for long rays like sky) + float off_axis = 1.0 / max(1e-6, max(0, rel_pos_norm.y) + lightnorm.y); + sunlight *= exp(-light_atten * off_axis); // Distance - temp2.z = Plen * dens_mul; + float density_dist = rel_pos_len * density_multiplier; - // Transparency (-> temp1) - // ATI Bugfix -- can't store temp1*temp2.z in a variable because the ati + // Transparency (-> combined_haze) + // ATI Bugfix -- can't store combined_haze*density_dist in a variable because the ati // compiler gets confused. - temp1 = exp(-temp1 * temp2.z); + combined_haze = exp(-combined_haze * density_dist); // Compute haze glow - temp2.x = dot(Pn, lightnorm.xyz); - temp2.x = 1. - temp2.x; - // temp2.x is 0 at the sun and increases away from sun - temp2.x = max(temp2.x, .001); - // 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 + float haze_glow = dot(rel_pos_norm, lightnorm.xyz); + 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 // Add "minimum anti-solar illumination" - temp2.x += .25; - - temp2.x *= sun_moon_glow_factor; + // For sun, add to glow. For moon, remove glow entirely. SL-13768 + haze_glow = (sun_moon_glow_factor < 1.0) ? 0.0 : (sun_moon_glow_factor * (haze_glow + 0.25)); // Haze color above cloud - vec4 color = ( blue_horizon * blue_weight * (sunlight + ambient_color) - + (haze_horizon * haze_weight) * (sunlight * temp2.x + ambient_color) - ); + vec4 color = blue_horizon * blue_weight * (sunlight + ambient_color) + + haze_horizon * haze_weight * (sunlight * haze_glow + ambient_color); // Final atmosphere additive - color *= (1. - temp1); + color *= (1. - combined_haze); // Increase ambient when there are more clouds - vec4 tmpAmbient = ambient_color; - tmpAmbient += max(vec4(0), (1. - ambient_color)) * cloud_shadow * 0.5; + // TODO 9/20: DJH what does this do? max(0,(1-ambient)) will change the color + vec4 ambient = ambient_color + max(vec4(0), (1. - ambient_color)) * cloud_shadow * 0.5; // Dim sunlight by cloud shadow percentage sunlight *= max(0.0, (1. - cloud_shadow)); // Haze color below cloud - vec4 additiveColorBelowCloud = (blue_horizon * blue_weight * (sunlight + tmpAmbient) - + (haze_horizon * haze_weight) * (sunlight * temp2.x + tmpAmbient) - ); + vec4 add_below_cloud = blue_horizon * blue_weight * (sunlight + ambient) + + haze_horizon * haze_weight * (sunlight * haze_glow + ambient); - - // Attenuate cloud color by atmosphere - temp1 = sqrt(temp1); //less atmos opacity (more transparency) below clouds + combined_haze = sqrt(combined_haze); // less atmos opacity (more transparency) below clouds // At horizon, blend high altitude sky color towards the darker color below the clouds - color += (additiveColorBelowCloud - color) * (1. - sqrt(temp1)); - - float optic_d = dot(Pn, lightnorm.xyz); - - vec3 halo_22 = halo22(optic_d); + color += (add_below_cloud - color) * (1. - sqrt(combined_haze)); + float optic_d = dot(rel_pos_norm, lightnorm.xyz); + vec3 halo_22 = halo22(optic_d); color.rgb += rainbow(optic_d); - color.rgb += halo_22; - color.rgb *= 2.; color.rgb = scaleSoftClip(color.rgb); - /// Gamma correct for WL (soft clip effect). + // Gamma correct for WL (soft clip effect). frag_data[0] = vec4(color.rgb, 1.0); - frag_data[1] = vec4(0.0,0.0,0.0,0.0); - frag_data[2] = vec4(0.0,0.0,0.0,1.0); //1.0 in norm.w masks off fog + frag_data[1] = vec4(0.0, 0.0, 0.0, 0.0); + frag_data[2] = vec4(0.0, 0.0, 0.0, 1.0); // 1.0 in norm.w masks off fog } - |