slang-shaders/bezel/Mega_Bezel/shaders/HyperspaceMadness/hsm-guest/hsm-avg-lum.slang
2022-06-24 20:06:45 -04:00

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#version 450
/*
Average Luminance Shader
Copyright (C) 2018-2020 guest(r) - guest.r@gmail.com
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
Thanks to HunterK for the mipmap hint. :D
*/
layout(push_constant) uniform Push
{
uint FrameCount;
vec4 SourceSize;
float lsmooth;
} params;
// #pragma parameter lsmooth "Raster Bloom Effect Smoothing" 0.70 0.50 0.99 0.01
// #define lsmooth params.lsmooth
#define lsmooth 0.7
#define COMPAT_TEXTURE(c,d) texture(c,d)
#define SourceSize params.SourceSize
#define TEX0 vTexCoord
layout(std140, set = 0, binding = 0) uniform UBO
{
mat4 MVP;
} global;
#pragma stage vertex
layout(location = 0) in vec4 Position;
layout(location = 1) in vec2 TexCoord;
layout(location = 0) out vec2 vTexCoord;
void main()
{
gl_Position = global.MVP * Position;
vTexCoord = TexCoord * 1.0001;
}
#pragma stage fragment
layout(location = 0) in vec2 vTexCoord;
layout(location = 0) out vec4 FragColor;
layout(set = 0, binding = 2) uniform sampler2D Source;
layout(set = 0, binding = 3) uniform sampler2D AvgLumPassFeedback;
// Reference: http://www.compuphase.com/cmetric.htm
// Reference: ScaleFX, author Sp00kyFox
float dist(vec3 A, vec3 B)
{
float r = 0.5 * (A.r + B.r);
vec3 d = A - B;
vec3 c = vec3(2. + r, 4., 3. - r);
return sqrt(dot(c*d, d)) / 3.;
}
void main()
{
float m = max(log2(SourceSize.x), log2(SourceSize.y));
m = floor(max(m, 1.0))-1.0;
vec2 dx = vec2(1.0/SourceSize.x, 0.0);
vec2 dy = vec2(0.0, 1.0/SourceSize.y);
vec2 y2 = 2.0*dy;
vec2 x2 = 2.0*dx;
float ltotal = 0.0;
ltotal+= length(textureLod(Source, vec2(0.3, 0.3), m).rgb);
ltotal+= length(textureLod(Source, vec2(0.3, 0.7), m).rgb);
ltotal+= length(textureLod(Source, vec2(0.7, 0.3), m).rgb);
ltotal+= length(textureLod(Source, vec2(0.7, 0.7), m).rgb);
ltotal*=0.25;
ltotal = pow(0.577350269 * ltotal, 0.70);
float lhistory = texture(AvgLumPassFeedback, vec2(0.5,0.5)).a;
ltotal = mix(ltotal, lhistory, lsmooth);
vec3 l1 = COMPAT_TEXTURE(Source, TEX0.xy ).rgb;
vec3 r1 = COMPAT_TEXTURE(Source, TEX0.xy +dx ).rgb;
vec3 l2 = COMPAT_TEXTURE(Source, TEX0.xy -dx ).rgb;
vec3 r2 = COMPAT_TEXTURE(Source, TEX0.xy +x2 ).rgb;
float c1 = dist(l2,l1);
float c2 = dist(l1,r1);
float c3 = dist(r2,r1);
FragColor = vec4(c1,c2,c3,ltotal);
}