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-rw-r--r--indra/newview/app_settings/shaders/class2/deferred/skyF.glsl149
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
}
-
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