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/**
* @file WLCloudsV.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
* $/LicenseInfo$
*/
uniform mat4 modelview_projection_matrix;
ATTRIBUTE vec3 position;
ATTRIBUTE vec2 texcoord0;
//////////////////////////////////////////////////////////////////////////
// The vertex shader for creating the atmospheric sky
///////////////////////////////////////////////////////////////////////////////
// Output parameters
VARYING vec3 vary_CloudColorSun;
VARYING vec3 vary_CloudColorAmbient;
VARYING float vary_CloudDensity;
VARYING vec2 vary_texcoord0;
VARYING vec2 vary_texcoord1;
VARYING vec2 vary_texcoord2;
VARYING vec2 vary_texcoord3;
VARYING float altitude_blend_factor;
// Inputs
uniform vec3 camPosLocal;
uniform vec3 lightnorm;
uniform vec3 sunlight_color;
uniform vec3 moonlight_color;
uniform int sun_up_factor;
uniform vec3 ambient_color;
uniform vec3 blue_horizon;
uniform vec3 blue_density;
uniform float haze_horizon;
uniform float haze_density;
uniform float cloud_shadow;
uniform float density_multiplier;
uniform float max_y;
uniform vec3 glow;
uniform float sun_moon_glow_factor;
uniform vec3 cloud_color;
uniform float cloud_scale;
// NOTE: Keep these in sync!
// indra\newview\app_settings\shaders\class1\deferred\skyV.glsl
// indra\newview\app_settings\shaders\class1\deferred\cloudsV.glsl
// indra\newview\app-settings\shaders\class2\windlight\cloudsV.glsl
// indra\newview\lllegacyatmospherics.cpp
// indra\newview\llsettingsvo.cpp
void main()
{
// World / view / projection
gl_Position = modelview_projection_matrix * vec4(position.xyz, 1.0);
// Texture coords
// SL-13084 EEP added support for custom cloud textures -- flip them horizontally to match the preview of Clouds > Cloud Scroll
vary_texcoord0 = vec2(-texcoord0.x, texcoord0.y); // See: LLSettingsVOSky::applySpecial
vary_texcoord0.xy -= 0.5;
vary_texcoord0.xy /= cloud_scale;
vary_texcoord0.xy += 0.5;
vary_texcoord1 = vary_texcoord0;
vary_texcoord1.x += lightnorm.x * 0.0125;
vary_texcoord1.y += lightnorm.z * 0.0125;
vary_texcoord2 = vary_texcoord0 * 16.;
vary_texcoord3 = vary_texcoord1 * 16.;
// Get relative position
vec3 rel_pos = position.xyz - camPosLocal.xyz + vec3(0, 50, 0);
altitude_blend_factor = clamp((rel_pos.y + 512.0) / max_y, 0.0, 1.0);
// Set altitude
if (rel_pos.y > 0)
{
rel_pos *= (max_y / rel_pos.y);
}
if (rel_pos.y < 0)
{
altitude_blend_factor = 0; // SL-11589 Fix clouds drooping below horizon
rel_pos *= (-32000. / rel_pos.y);
}
// Can normalize then
vec3 rel_pos_norm = normalize(rel_pos);
float rel_pos_len = length(rel_pos);
// Initialize temp variables
vec3 sunlight = sunlight_color;
vec3 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 + vec3(haze_density * 0.25)) * (density_multiplier * max_y);
// Calculate relative weights
vec3 combined_haze = abs(blue_density) + vec3(abs(haze_density));
vec3 blue_weight = blue_density / combined_haze;
vec3 haze_weight = haze_density / combined_haze;
// 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
float density_dist = rel_pos_len * density_multiplier;
// Transparency (-> combined_haze)
// ATI Bugfix -- can't store combined_haze*density_dist in a variable because the ati
// compiler gets confused.
combined_haze = exp(-combined_haze * density_dist);
// Compute haze glow
float haze_glow = 1.0 - dot(rel_pos_norm, lightnorm.xyz);
// 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
haze_glow *= sun_moon_glow_factor;
// Add "minimum anti-solar illumination"
// For sun, add to glow. For moon, remove glow entirely. SL-13768
haze_glow = (sun_moon_glow_factor < 1.0) ? 0.0 : (haze_glow + 0.25);
// Increase ambient when there are more clouds
vec3 tmpAmbient = ambient_color;
tmpAmbient += (1. - tmpAmbient) * cloud_shadow * 0.5;
// Dim sunlight by cloud shadow percentage
sunlight *= (1. - cloud_shadow);
// Haze color below cloud
vec3 additiveColorBelowCloud =
(blue_horizon * blue_weight * (sunlight + tmpAmbient) + (haze_horizon * haze_weight) * (sunlight * haze_glow + tmpAmbient));
// CLOUDS
sunlight = sunlight_color;
off_axis = 1.0 / max(1e-6, lightnorm.y * 2.);
sunlight *= exp(-light_atten * off_axis);
// Cloud color out
vary_CloudColorSun = (sunlight * haze_glow) * cloud_color;
vary_CloudColorAmbient = tmpAmbient * cloud_color;
// Attenuate cloud color by atmosphere
combined_haze = sqrt(combined_haze); // less atmos opacity (more transparency) below clouds
vary_CloudColorSun *= combined_haze;
vary_CloudColorAmbient *= combined_haze;
vec3 oHazeColorBelowCloud = additiveColorBelowCloud * (1. - combined_haze);
// Make a nice cloud density based on the cloud_shadow value that was passed in.
vary_CloudDensity = 2. * (cloud_shadow - 0.25);
// Combine these to minimize register use
vary_CloudColorAmbient += oHazeColorBelowCloud;
// needs this to compile on mac
//vary_AtmosAttenuation = vec3(0.0,0.0,0.0);
// END CLOUDS
}
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