diff options
Diffstat (limited to 'indra/newview/app_settings/shaders/class3/windlight/cloudsF.glsl')
| -rw-r--r-- | indra/newview/app_settings/shaders/class3/windlight/cloudsF.glsl | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/indra/newview/app_settings/shaders/class3/windlight/cloudsF.glsl b/indra/newview/app_settings/shaders/class3/windlight/cloudsF.glsl new file mode 100644 index 0000000000..96c70651b1 --- /dev/null +++ b/indra/newview/app_settings/shaders/class3/windlight/cloudsF.glsl @@ -0,0 +1,104 @@ +/** + * @file WLCloudsF.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 + * $/LicenseInfo$ + */ + +#ifdef DEFINE_GL_FRAGCOLOR +out vec4 frag_color; +#else +#define frag_color gl_FragColor +#endif + +///////////////////////////////////////////////////////////////////////// +// The fragment shader for the sky +///////////////////////////////////////////////////////////////////////// + +VARYING vec4 vary_CloudColorSun; +VARYING vec4 vary_CloudColorAmbient; +VARYING float vary_CloudDensity; +VARYING vec2 vary_texcoord0; +VARYING vec2 vary_texcoord1; +VARYING vec2 vary_texcoord2; +VARYING vec2 vary_texcoord3; + +uniform sampler2D cloud_noise_texture; +uniform vec4 cloud_pos_density1; +uniform vec4 cloud_pos_density2; +uniform vec4 gamma; + +/// Soft clips the light with a gamma correction +vec3 scaleSoftClip(vec3 light) { + //soft clip effect: + light = 1. - clamp(light, vec3(0.), vec3(1.)); + light = 1. - pow(light, gamma.xxx); + + return light; +} + +void main() +{ + // Set variables + vec2 uv1 = vary_texcoord0.xy; + vec2 uv2 = vary_texcoord1.xy; + + vec4 cloudColorSun = vary_CloudColorSun; + vec4 cloudColorAmbient = vary_CloudColorAmbient; + float cloudDensity = vary_CloudDensity; + vec2 uv3 = vary_texcoord2.xy; + vec2 uv4 = vary_texcoord3.xy; + + // Offset texture coords + uv1 += cloud_pos_density1.xy; //large texture, visible density + uv2 += cloud_pos_density1.xy; //large texture, self shadow + uv3 += cloud_pos_density2.xy; //small texture, visible density + uv4 += cloud_pos_density2.xy; //small texture, self shadow + + + // Compute alpha1, the main cloud opacity + float alpha1 = (texture2D(cloud_noise_texture, uv1).x - 0.5) + (texture2D(cloud_noise_texture, uv3).x - 0.5) * cloud_pos_density2.z; + alpha1 = min(max(alpha1 + cloudDensity, 0.) * 10. * cloud_pos_density1.z, 1.); + + // And smooth + alpha1 = 1. - alpha1 * alpha1; + alpha1 = 1. - alpha1 * alpha1; + + + // Compute alpha2, for self shadowing effect + // (1 - alpha2) will later be used as percentage of incoming sunlight + float alpha2 = (texture2D(cloud_noise_texture, uv2).x - 0.5); + alpha2 = min(max(alpha2 + cloudDensity, 0.) * 2.5 * cloud_pos_density1.z, 1.); + + // And smooth + alpha2 = 1. - alpha2; + alpha2 = 1. - alpha2 * alpha2; + + // Combine + vec4 color; + color = (cloudColorSun*(1.-alpha2) + cloudColorAmbient); + color *= 2.; + + /// Gamma correct for WL (soft clip effect). + frag_color.rgb = scaleSoftClip(color.rgb); + frag_color.a = alpha1; +} + |