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/**
* @file class1\deferred\moonF.glsl
*
* $LicenseInfo:firstyear=2005&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2005, 2020 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
* $/LicenseInfo$
*/
#extension GL_ARB_texture_rectangle : enable
/*[EXTRA_CODE_HERE]*/
#ifdef DEFINE_GL_FRAGCOLOR
out vec4 frag_data[3];
#else
#define frag_data gl_FragData
#endif
uniform vec4 color;
uniform vec3 moonlight_color;
uniform vec3 moon_dir;
uniform float moon_brightness;
uniform sampler2D diffuseMap;
VARYING vec2 vary_texcoord0;
vec3 srgb_to_linear(vec3 c);
/// Soft clips the light with a gamma correction
vec3 scaleSoftClip(vec3 light);
void main()
{
// Restore Pre-EEP alpha fade moon near horizon
float fade = 1.0;
if( moon_dir.z > 0 )
fade = clamp( moon_dir.z*moon_dir.z*4.0, 0.0, 1.0 );
vec4 c = texture2D(diffuseMap, vary_texcoord0.xy);
// SL-14113 Don't write to depth; prevent moon's quad from hiding stars which should be visible
// Moon texture has transparent pixels <0x55,0x55,0x55,0x00>
if (c.a <= 2./255.) // 0.00784
discard;
// c.rgb = srgb_to_linear(c.rgb);
c.rgb *= moonlight_color.rgb;
c.rgb *= moon_brightness;
c.rgb *= fade;
c.a *= fade;
c.rgb = scaleSoftClip(c.rgb);
frag_data[0] = vec4(c.rgb, c.a);
frag_data[1] = vec4(0.0);
frag_data[2] = vec4(0.0, 0.0, 0.0, GBUFFER_FLAG_HAS_ATMOS);
gl_FragDepth = LL_SHADER_CONST_CLOUD_MOON_DEPTH; // SL-14113
}
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