libretro/slang-shaders
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Merge pull request #559 from metallic77/slang

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Update ntsc-mini.slang
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hizzlekizzle 2024-03-15 17:45:45 -05:00 committed by GitHub
commit c934e47f53
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1 changed files with 11 additions and 6 deletions
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ntsc/shaders/ntsc-simple/ntsc-mini.slang
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@ -3,7 +3,7 @@
layout(push_constant) uniform Push
{
float ntsc_sat,lpass,comb_filter,ofq,luma_rate,mini_hue;
float ntsc_sat,lpass,comb_filter,ofq,luma_rate,mini_hue,snes_mode;
} params;
#pragma parameter comb_filter "Chroma Comb. Filter Str." 0.6 0.0 1.0 0.05
@ -12,6 +12,7 @@ layout(push_constant) uniform Push
#pragma parameter mini_hue "Hue Shift" 0.0 -6.3 6.3 0.05
#pragma parameter ntsc_sat "Saturation" 3.0 0.0 6.0 0.05
#pragma parameter ofq "Color Clock Frequency Mhz (typical 3.579)" 3.58 0.0 14.32 0.01
#pragma parameter snes_mode "Snes mode" 0.0 0.0 1.0 1.0
#define comb_filter params.comb_filter
#define lpass params.lpass
@ -19,6 +20,7 @@ layout(push_constant) uniform Push
#define ofq params.ofq
#define luma_rate params.luma_rate
#define mini_hue params.mini_hue
#define snes_mode params.snes_mode
layout(std140, set = 0, binding = 0) uniform UBO
{
@ -86,12 +88,15 @@ for (int n=-3; n<4; n++)
{
float p = float(n);
float w = exp(-lpass*p*p);
float snes_phase = 0.0;
// vTexCoord is "time" variable, 52.6μs is time active pixels are displayed
// 1000000 multiply (osc) /divide (52.6μs) are omitted as they cancel one another
float carrier = (vTexCoord.x * ofq * 52.6 + p)*PI*0.5;
if (snes_mode == 1.0) snes_phase = mod(vTexCoord.y*262.0, 2.0)*PI;
float carrier = (vTexCoord.x * ofq * 52.6 + p)*PI*0.5 + snes_phase;
// every other NTSC line will be 180' shifted
float carrier_up = (vTexCoord.x * ofq * 52.6 + p)*PI*0.5 + PI;
float carrier_up = carrier + PI;
// lineup and line will cancel chroma/luma one another on comb
vec3 phase = vec3(1.0,0.5*cos(carrier+mini_hue) ,0.5*sin(carrier+mini_hue));
@ -103,9 +108,9 @@ float line_cur = compo0(p,phase)*w;
float line_up = compo1(p,phase_up)*w;
vec3 rgb = vec3(0.0);
// luma
// luma comb
rgb.r = (line_up+line_cur)/2.0;
// chroma
// chroma comb
rgb.gb = vec2(line_cur-(line_up+line_cur)/2.0*comb_filter);
final += rgb*phasefinal;
sum += w;