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Grade - Update + Features + Fixes. Click for log

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- Automatic compensation for black lift in 1886a gamma function, use instead "Black Level" to raise or lower blacks as usual
- Automatic gamma compensation given the new normalized black
- "Black Level" now is deterministic and given in 8-bit values. +10 means blacks will be lifted 10 point values for any gamma output
- Optimization. Now if signal type is RGB, phosphors + color space are sRGB and temperature ~6500K then the wp_adjust() function will be bypassed
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Dogway 2023-09-11 19:46:48 +01:00 committed by GitHub
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2 changed files with 40 additions and 22 deletions
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31
misc/shaders/grade-no-LUT.slang
View file

@ -85,7 +85,7 @@ layout(std140, set = 0, binding = 0) uniform UBO
} global;
/*
Grade (13-08-2023)
Grade (26-08-2023)
> See settings decriptions at: https://forums.libretro.com/t/dogways-grading-shader-slang/27148/442
> Ubershader grouping some monolithic color related shaders:
@ -128,14 +128,14 @@ layout(std140, set = 0, binding = 0) uniform UBO
// Analogue controls
#pragma parameter g_analog "// ANALOG CONTROLS //" 0.0 0.0 1.0 1.0
#pragma parameter wp_temperature "White Point" 6504.0 5004.0 12004.0 100.0
#pragma parameter g_CRT_l "CRT Gamma" 2.50 2.30 2.60 0.01
#pragma parameter g_CRT_b "CRT Brightness" 50.0 0.0 100.0 1.0
#pragma parameter g_CRT_c "CRT Contrast" 50.0 0.0 100.0 1.0
#pragma parameter g_hue_degrees "CRT Hue" 0.0 -180.0 180.0 1.0
#pragma parameter g_U_SHIFT "CRT U Shift" 0.0 -0.2 0.2 0.01
#pragma parameter g_V_SHIFT "CRT V Shift" 0.0 -0.2 0.2 0.01
#pragma parameter g_U_MUL "CRT U Multiplier" 1.0 0.0 2.0 0.01
#pragma parameter g_V_MUL "CRT V Multiplier" 1.0 0.0 2.0 0.01
#pragma parameter g_CRT_l "CRT Gamma" 2.50 2.30 2.60 0.01
#pragma parameter g_CRT_b "CRT Brightness" 50.0 0.0 100.0 1.0
#pragma parameter g_CRT_c "CRT Contrast" 50.0 0.0 100.0 1.0
#pragma parameter g_CRT_br "CRT Beam Red" 1.0 0.0 1.2 0.01
#pragma parameter g_CRT_bg "CRT Beam Green" 1.0 0.0 1.2 0.01
#pragma parameter g_CRT_bb "CRT Beam Blue" 1.0 0.0 1.2 0.01
@ -161,7 +161,7 @@ layout(std140, set = 0, binding = 0) uniform UBO
#pragma parameter g_satr "Hue vs Sat Red" 0.0 -1.0 1.0 0.01
#pragma parameter g_satg "Hue vs Sat Green" 0.0 -1.0 1.0 0.01
#pragma parameter g_satb "Hue vs Sat Blue" 0.0 -1.0 1.0 0.01
#pragma parameter g_lift "Black Level" 0.0 -0.5 0.5 0.01
#pragma parameter g_lift "Black Level" 0.0 -15.0 15.0 1.0
#pragma parameter blr "Black-Red Tint" 0.0 0.0 1.0 0.01
#pragma parameter blg "Black-Green Tint" 0.0 0.0 1.0 0.01
#pragma parameter blb "Black-Blue Tint" 0.0 0.0 1.0 0.01
@ -187,6 +187,7 @@ layout(std140, set = 0, binding = 0) uniform UBO
#define U_MUL params.g_U_MUL
#define V_MUL params.g_V_MUL
#define CRT_l -(100000.*log((72981.-500000./(3.*max(2.3,params.g_CRT_l)))/9058.))/945461.
#define wp_temp global.wp_temperature
#define lum_fix params.g_lum_fix
#define SMS_bl global.g_SMS_bl
#define MD_Palette global.g_MD_Pal
@ -205,7 +206,8 @@ layout(std140, set = 0, binding = 0) uniform UBO
#define lum params.g_lum
#define cntrst params.g_cntrst
#define mid params.g_mid
#define lift params.g_lift
// lift goes from -15 to 15 points on an 8-bit scale (0-255)
#define lift (SPC==0.0 ? moncurve_f(abs(params.g_lift)/255.0,2.4,0.055) : pow(abs(params.g_lift)/255.0,SPC==3.0?2.199:2.4)) * sign(params.g_lift)
#define blr params.blr
#define blg params.blg
#define blb params.blb
@ -359,6 +361,12 @@ float EOTF_1886a(float color, float bl, float brightness, float contrast) {
float sl = k * pow(Vc + Lb, a1-a2); // Slope for knee gamma
color = color >= Vc ? k * pow(color + Lb, a1 ) : sl * pow(color + Lb, a2 );
// Black lift compensation
float bc = 0.00446395*pow(bl,1.23486);
color = min(max(color-bc,0.0)*(1.0/(1.0-bc)), 1.0); // Undo Lift
color = pow(color,1.0-0.00843283*pow(bl,1.22744)); // Restore Gamma from 'Undo Lift'
return color;
}
@ -488,8 +496,8 @@ vec3 GamutCompression (vec3 rgb, float grey) {
// Limit/Thres order is Cyan, Magenta, Yellow
vec3 beam = max(vec3(0.0),vec3(beamg,(beamb+beamr)/2.,(beamr+beamg)/2.));
vec3 sat = max(vec3(0.0),vec3(satg, (satb +satr) /2.,(satr +satg) /2.)+1.); // center at 1
float temp = max(0.0,abs(global.wp_temperature-7000.)-1000.)/825.+1.; // center at 1
vec3 WPD = global.wp_temperature < 7000. ? vec3(1.,temp,(temp-1.)/2.+1.) : vec3((temp-1.)/2.+1.,temp,1.);
float temp = max(0.0,abs(wp_temp-7000.)-1000.)/825.+1.; // center at 1
vec3 WPD = wp_temp < 7000. ? vec3(1.,temp,(temp-1.)/2.+1.) : vec3((temp-1.)/2.+1.,temp,1.);
sat = max(0.0,g_sat+1.0)*(sat*beam) * WPD;
mat2x3 LimThres = mat2x3( 0.100000,0.100000,0.100000,
@ -755,7 +763,7 @@ void main()
// Adding Sega Master System 1 non-linear blue "lift": https://github.com/ekeeke/Genesis-Plus-GX/issues/345#issuecomment-820885780
src = SMS_bl > 0.0 ? pow(src, vec3(1.0,1.0,1.0/1.16)) : src;
// Reproduce the Sega MegaDrive palette (same as the BlastEm core output so don't use in this core): https://github.com/ekeeke/Genesis-Plus-GX/issues/345
// Reproduce the Sega MegaDrive palette (same as the BlastEm core output so don't use for this core): https://github.com/ekeeke/Genesis-Plus-GX/issues/345
src = MD_Palette > 0.0 ? vec3(contrast_sigmoid_inv(src.r,2.578419881,0.520674), \
contrast_sigmoid_inv(src.g,2.578419881,0.520674), \
contrast_sigmoid_inv(src.b,2.578419881,0.520674)) : src;
@ -826,7 +834,8 @@ void main()
// White Point Mapping
col = wp_adjust(screen.rgb, global.wp_temperature, m_in, m_ou);
col = (signal==0.0) && (m_in==m_ou) && (6499. < wp_temp) && (wp_temp < 6505.) ? screen.rgb : \
wp_adjust(screen.rgb, wp_temp, m_in, m_ou);
// SAT + HUE vs SAT (in IPT space)
@ -890,7 +899,7 @@ void main()
// Lift + Gain -PP Digital Controls- (Could do in Yxy but performance reasons)
src_h = clamp(rolled_gain_v3(contrast, clamp(lum, -0.49, 0.99)), 0.0, 1.0);
src_h += (lift / 20.0) * (1.0 - contrast);
src_h += lift * (1.0 - contrast);
// Vignetting (in linear space, so after EOTF^-1 it's power shaped; 0.5 thres converts to ~0.75)

31
misc/shaders/grade.slang
View file

@ -89,7 +89,7 @@ layout(std140, set = 0, binding = 0) uniform UBO
} global;
/*
Grade (13-08-2023)
Grade (26-08-2023)
> See settings decriptions at: https://forums.libretro.com/t/dogways-grading-shader-slang/27148/442
> Ubershader grouping some monolithic color related shaders:
@ -132,14 +132,14 @@ layout(std140, set = 0, binding = 0) uniform UBO
// Analogue controls
#pragma parameter g_analog "// ANALOG CONTROLS //" 0.0 0.0 1.0 1.0
#pragma parameter wp_temperature "White Point" 8504.0 5004.0 12004.0 100.0
#pragma parameter g_CRT_l "CRT Gamma" 2.50 2.30 2.60 0.01
#pragma parameter g_CRT_b "CRT Brightness" 50.0 0.0 100.0 1.0
#pragma parameter g_CRT_c "CRT Contrast" 50.0 0.0 100.0 1.0
#pragma parameter g_hue_degrees "CRT Hue" 0.0 -180.0 180.0 1.0
#pragma parameter g_U_SHIFT "CRT U Shift" 0.0 -0.2 0.2 0.01
#pragma parameter g_V_SHIFT "CRT V Shift" 0.0 -0.2 0.2 0.01
#pragma parameter g_U_MUL "CRT U Multiplier" 1.0 0.0 2.0 0.01
#pragma parameter g_V_MUL "CRT V Multiplier" 1.0 0.0 2.0 0.01
#pragma parameter g_CRT_l "CRT Gamma" 2.50 2.30 2.60 0.01
#pragma parameter g_CRT_b "CRT Brightness" 50.0 0.0 100.0 1.0
#pragma parameter g_CRT_c "CRT Contrast" 50.0 0.0 100.0 1.0
#pragma parameter g_CRT_br "CRT Beam Red" 1.0 0.0 1.2 0.01
#pragma parameter g_CRT_bg "CRT Beam Green" 1.0 0.0 1.2 0.01
#pragma parameter g_CRT_bb "CRT Beam Blue" 1.0 0.0 1.2 0.01
@ -165,7 +165,7 @@ layout(std140, set = 0, binding = 0) uniform UBO
#pragma parameter g_satr "Hue vs Sat Red" 0.0 -1.0 1.0 0.01
#pragma parameter g_satg "Hue vs Sat Green" 0.0 -1.0 1.0 0.01
#pragma parameter g_satb "Hue vs Sat Blue" 0.0 -1.0 1.0 0.01
#pragma parameter g_lift "Black Level" 0.0 -0.5 0.5 0.01
#pragma parameter g_lift "Black Level" 0.0 -15.0 15.0 1.0
#pragma parameter blr "Black-Red Tint" 0.0 0.0 1.0 0.01
#pragma parameter blg "Black-Green Tint" 0.0 0.0 1.0 0.01
#pragma parameter blb "Black-Blue Tint" 0.0 0.0 1.0 0.01
@ -195,6 +195,7 @@ layout(std140, set = 0, binding = 0) uniform UBO
#define U_MUL params.g_U_MUL
#define V_MUL params.g_V_MUL
#define CRT_l -(100000.*log((72981.-500000./(3.*max(2.3,params.g_CRT_l)))/9058.))/945461.
#define wp_temp global.wp_temperature
#define lum_fix params.g_lum_fix
#define SMS_bl global.g_SMS_bl
#define MD_Palette global.g_MD_Pal
@ -213,7 +214,8 @@ layout(std140, set = 0, binding = 0) uniform UBO
#define lum params.g_lum
#define cntrst params.g_cntrst
#define mid params.g_mid
#define lift params.g_lift
// lift goes from -15 to 15 points on an 8-bit scale (0-255)
#define lift (SPC==0.0 ? moncurve_f(abs(params.g_lift)/255.0,2.4,0.055) : pow(abs(params.g_lift)/255.0,SPC==3.0?2.199:2.4)) * sign(params.g_lift)
#define blr params.blr
#define blg params.blg
#define blb params.blb
@ -369,6 +371,12 @@ float EOTF_1886a(float color, float bl, float brightness, float contrast) {
float sl = k * pow(Vc + Lb, a1-a2); // Slope for knee gamma
color = color >= Vc ? k * pow(color + Lb, a1 ) : sl * pow(color + Lb, a2 );
// Black lift compensation
float bc = 0.00446395*pow(bl,1.23486);
color = min(max(color-bc,0.0)*(1.0/(1.0-bc)), 1.0); // Undo Lift
color = pow(color,1.0-0.00843283*pow(bl,1.22744)); // Restore Gamma from 'Undo Lift'
return color;
}
@ -511,8 +519,8 @@ vec3 GamutCompression (vec3 rgb, float grey) {
// Limit/Thres order is Cyan, Magenta, Yellow
vec3 beam = max(vec3(0.0),vec3(beamg,(beamb+beamr)/2.,(beamr+beamg)/2.));
vec3 sat = max(vec3(0.0),vec3(satg, (satb +satr) /2.,(satr +satg) /2.)+1.); // center at 1
float temp = max(0.0,abs(global.wp_temperature-7000.)-1000.)/825.+1.; // center at 1
vec3 WPD = global.wp_temperature < 7000. ? vec3(1.,temp,(temp-1.)/2.+1.) : vec3((temp-1.)/2.+1.,temp,1.);
float temp = max(0.0,abs(wp_temp-7000.)-1000.)/825.+1.; // center at 1
vec3 WPD = wp_temp < 7000. ? vec3(1.,temp,(temp-1.)/2.+1.) : vec3((temp-1.)/2.+1.,temp,1.);
sat = max(0.0,g_sat+1.0)*(sat*beam) * WPD;
mat2x3 LimThres = mat2x3( 0.100000,0.100000,0.100000,
@ -778,7 +786,7 @@ void main()
// Adding Sega Master System 1 non-linear blue "lift": https://github.com/ekeeke/Genesis-Plus-GX/issues/345#issuecomment-820885780
src = SMS_bl > 0.0 ? pow(src, vec3(1.0,1.0,1.0/1.16)) : src;
// Reproduce the Sega MegaDrive palette (same as the BlastEm core output so don't use in this core): https://github.com/ekeeke/Genesis-Plus-GX/issues/345
// Reproduce the Sega MegaDrive palette (same as the BlastEm core output so don't use for this core): https://github.com/ekeeke/Genesis-Plus-GX/issues/345
src = MD_Palette > 0.0 ? vec3(contrast_sigmoid_inv(src.r,2.578419881,0.520674), \
contrast_sigmoid_inv(src.g,2.578419881,0.520674), \
contrast_sigmoid_inv(src.b,2.578419881,0.520674)) : src;
@ -861,7 +869,8 @@ void main()
// White Point Mapping
col = wp_adjust(screen.rgb, global.wp_temperature, m_in, m_ou);
col = (signal==0.0) && (m_in==m_ou) && (6499. < wp_temp) && (wp_temp < 6505.) ? screen.rgb : \
wp_adjust(screen.rgb, wp_temp, m_in, m_ou);
// SAT + HUE vs SAT (in IPT space)
@ -925,7 +934,7 @@ void main()
// Lift + Gain -PP Digital Controls- (Could do in Yxy but performance reasons)
src_h = clamp(rolled_gain_v3(contrast, clamp(lum, -0.49, 0.99)), 0.0, 1.0);
src_h += (lift / 20.0) * (1.0 - contrast);
src_h += lift * (1.0 - contrast);
// Vignetting (in linear space, so after EOTF^-1 it's power shaped; 0.5 thres converts to ~0.75)