diff options
Diffstat (limited to 'indra/newview/app_settings/shaders/class3/windlight/skyV.glsl')
| -rw-r--r-- | indra/newview/app_settings/shaders/class3/windlight/skyV.glsl | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/indra/newview/app_settings/shaders/class3/windlight/skyV.glsl b/indra/newview/app_settings/shaders/class3/windlight/skyV.glsl new file mode 100644 index 0000000000..3788ddaf2d --- /dev/null +++ b/indra/newview/app_settings/shaders/class3/windlight/skyV.glsl @@ -0,0 +1,156 @@ +/** + * @file WLSkyV.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; + +// SKY //////////////////////////////////////////////////////////////////////// +// The vertex shader for creating the atmospheric sky +/////////////////////////////////////////////////////////////////////////////// + +// Output parameters +VARYING vec4 vary_HazeColor; + +// Inputs +uniform vec3 camPosLocal; + +uniform vec4 lightnorm; +uniform vec4 sunlight_color; +uniform vec4 ambient; +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 max_y; + +uniform vec4 glow; + +uniform vec4 cloud_color; + +void main() +{ + + // World / view / projection + gl_Position = modelview_projection_matrix * vec4(position.xyz, 1.0); + + // Get relative position + vec3 P = position.xyz - camPosLocal.xyz + vec3(0,50,0); + //vec3 P = position.xyz + vec3(0,50,0); + + // Set altitude + if (P.y > 0.) + { + P *= (max_y / P.y); + } + else + { + P *= (-32000. / P.y); + } + + // Can normalize then + vec3 Pn = normalize(P); + float Plen = length(P); + + // Initialize temp variables + vec4 temp1 = vec4(0.); + vec4 temp2 = vec4(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 + vec4(haze_density * 0.25)) * (density_multiplier * max_y); + + // Calculate relative weights + temp1 = blue_density + haze_density; + blue_weight = blue_density / temp1; + haze_weight = haze_density / temp1; + + // 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); + + // Distance + temp2.z = Plen * density_multiplier; + + // Transparency (-> temp1) + // ATI Bugfix -- can't store temp1*temp2.z in a variable because the ati + // compiler gets confused. + temp1 = exp(-temp1 * temp2.z); + + + // 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 + + // Add "minimum anti-solar illumination" + temp2.x += .25; + + + // Haze color above cloud + vary_HazeColor = ( blue_horizon * blue_weight * (sunlight + ambient) + + (haze_horizon * haze_weight) * (sunlight * temp2.x + ambient) + ); + + + // Increase ambient when there are more clouds + vec4 tmpAmbient = ambient; + tmpAmbient += (1. - tmpAmbient) * cloud_shadow * 0.5; + + // Dim sunlight by cloud shadow percentage + sunlight *= (1. - cloud_shadow); + + // Haze color below cloud + vec4 additiveColorBelowCloud = ( blue_horizon * blue_weight * (sunlight + tmpAmbient) + + (haze_horizon * haze_weight) * (sunlight * temp2.x + tmpAmbient) + ); + + // Final atmosphere additive + vary_HazeColor *= (1. - temp1); + + // Attenuate cloud color by atmosphere + temp1 = sqrt(temp1); //less atmos opacity (more transparency) below clouds + + // At horizon, blend high altitude sky color towards the darker color below the clouds + vary_HazeColor += (additiveColorBelowCloud - vary_HazeColor) * (1. - sqrt(temp1)); + + // won't compile on mac without this being set + //vary_AtmosAttenuation = vec3(0.0,0.0,0.0); +} + |