67 lines
1.8 KiB
GLSL
67 lines
1.8 KiB
GLSL
/**
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* @file exposureF.glsl
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*
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* $LicenseInfo:firstyear=2023&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2023, Linden Research, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
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* $/LicenseInfo$
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*/
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/*[EXTRA_CODE_HERE]*/
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out vec4 frag_color;
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uniform sampler2D emissiveRect;
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#ifdef USE_LAST_EXPOSURE
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uniform sampler2D exposureMap;
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#endif
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uniform float dt;
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uniform vec2 noiseVec;
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uniform vec4 dynamic_exposure_params;
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uniform vec4 dynamic_exposure_params2;
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float lum(vec3 col)
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{
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vec3 l = vec3(0.2126, 0.7152, 0.0722);
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return dot(l, col);
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}
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void main()
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{
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vec2 tc = vec2(0.5,0.5);
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float L = textureLod(emissiveRect, tc, 8).r;
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float max_L = dynamic_exposure_params.x;
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L = clamp(L, 0.0, max_L);
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L /= max_L;
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L = pow(L, 2.0);
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float s = mix(dynamic_exposure_params.z, dynamic_exposure_params.y, L);
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#ifdef USE_LAST_EXPOSURE
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float prev = texture(exposureMap, vec2(0.5,0.5)).r;
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float speed = -log(dynamic_exposure_params.w) / dynamic_exposure_params2.w;
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s = mix(prev, s, 1 - exp(-speed * dt));
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#endif
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frag_color = max(vec4(s, s, s, dt), vec4(0.0));
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}
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