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/**
* @file postDeferredGammaCorrect.glsl
*
* $LicenseInfo:firstyear=2007&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2007, 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
* $/LicenseInfo$
*/
/*[EXTRA_CODE_HERE]*/
out vec4 frag_color;
uniform sampler2D diffuseRect;
uniform sampler2D exposureMap;
uniform vec2 screen_res;
in vec2 vary_fragcoord;
vec3 linear_to_srgb(vec3 cl);
//===============================================================
// tone mapping taken from Khronos sample implementation
//===============================================================
// sRGB => XYZ => D65_2_D60 => AP1 => RRT_SAT
const mat3 ACESInputMat = mat3
(
0.59719, 0.07600, 0.02840,
0.35458, 0.90834, 0.13383,
0.04823, 0.01566, 0.83777
);
// ODT_SAT => XYZ => D60_2_D65 => sRGB
const mat3 ACESOutputMat = mat3
(
1.60475, -0.10208, -0.00327,
-0.53108, 1.10813, -0.07276,
-0.07367, -0.00605, 1.07602
);
// ACES tone map (faster approximation)
// see: https://knarkowicz.wordpress.com/2016/01/06/aces-filmic-tone-mapping-curve/
vec3 toneMapACES_Narkowicz(vec3 color)
{
const float A = 2.51;
const float B = 0.03;
const float C = 2.43;
const float D = 0.59;
const float E = 0.14;
return clamp((color * (A * color + B)) / (color * (C * color + D) + E), 0.0, 1.0);
}
// ACES filmic tone map approximation
// see https://github.com/TheRealMJP/BakingLab/blob/master/BakingLab/ACES.hlsl
vec3 RRTAndODTFit(vec3 color)
{
vec3 a = color * (color + 0.0245786) - 0.000090537;
vec3 b = color * (0.983729 * color + 0.4329510) + 0.238081;
return a / b;
}
// tone mapping
vec3 toneMapACES_Hill(vec3 color)
{
color = ACESInputMat * color;
// Apply RRT and ODT
color = RRTAndODTFit(color);
color = ACESOutputMat * color;
// Clamp to [0, 1]
color = clamp(color, 0.0, 1.0);
return color;
}
uniform float exposure;
uniform float gamma;
uniform float aces_mix;
vec3 toneMap(vec3 color)
{
#ifndef NO_POST
float exp_scale = texture(exposureMap, vec2(0.5,0.5)).r;
color *= exposure * exp_scale;
// mix ACES and Linear here as a compromise to avoid over-darkening legacy content
color = mix(toneMapACES_Hill(color), color, aces_mix);
#endif
return color;
}
//===============================================================
//=================================
// borrowed noise from:
// <https://www.shadertoy.com/view/4dS3Wd>
// By Morgan McGuire @morgan3d, http://graphicscodex.com
//
float hash(float n) { return fract(sin(n) * 1e4); }
float hash(vec2 p) { return fract(1e4 * sin(17.0 * p.x + p.y * 0.1) * (0.1 + abs(sin(p.y * 13.0 + p.x)))); }
float noise(float x) {
float i = floor(x);
float f = fract(x);
float u = f * f * (3.0 - 2.0 * f);
return mix(hash(i), hash(i + 1.0), u);
}
float noise(vec2 x) {
vec2 i = floor(x);
vec2 f = fract(x);
// Four corners in 2D of a tile
float a = hash(i);
float b = hash(i + vec2(1.0, 0.0));
float c = hash(i + vec2(0.0, 1.0));
float d = hash(i + vec2(1.0, 1.0));
// Simple 2D lerp using smoothstep envelope between the values.
// return vec3(mix(mix(a, b, smoothstep(0.0, 1.0, f.x)),
// mix(c, d, smoothstep(0.0, 1.0, f.x)),
// smoothstep(0.0, 1.0, f.y)));
// Same code, with the clamps in smoothstep and common subexpressions
// optimized away.
vec2 u = f * f * (3.0 - 2.0 * f);
return mix(a, b, u.x) + (c - a) * u.y * (1.0 - u.x) + (d - b) * u.x * u.y;
}
//=============================
void debugExposure(inout vec3 color)
{
float exp_scale = texture(exposureMap, vec2(0.5,0.5)).r;
exp_scale *= 0.5;
if (abs(vary_fragcoord.y-exp_scale) < 0.01 && vary_fragcoord.x < 0.1)
{
color = vec3(1,0,0);
}
}
vec3 legacyGamma(vec3 color)
{
vec3 c = 1. - clamp(color, vec3(0.), vec3(1.));
c = 1. - pow(c, vec3(gamma)); // s/b inverted already CPU-side
return c;
}
void main()
{
//this is the one of the rare spots where diffuseRect contains linear color values (not sRGB)
vec4 diff = texture(diffuseRect, vary_fragcoord);
#ifdef LEGACY_GAMMA
diff.rgb = linear_to_srgb(diff.rgb);
diff.rgb = legacyGamma(diff.rgb);
#else
#ifndef NO_POST
diff.rgb = toneMap(diff.rgb);
#endif
diff.rgb = linear_to_srgb(diff.rgb);
#endif
vec2 tc = vary_fragcoord.xy*screen_res*4.0;
vec3 seed = (diff.rgb+vec3(1.0))*vec3(tc.xy, tc.x+tc.y);
vec3 nz = vec3(noise(seed.rg), noise(seed.gb), noise(seed.rb));
diff.rgb += nz*0.003;
//debugExposure(diff.rgb);
frag_color = max(diff, vec4(0));
}
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