mirror of
https://github.com/libretro/slang-shaders.git
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122 lines
3.3 KiB
Plaintext
122 lines
3.3 KiB
Plaintext
#version 450
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layout(push_constant) uniform Push
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{
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float ntsc_sat,lpass,comb_filter,ofq,luma_rate,mini_hue,snes_mode;
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} params;
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#pragma parameter comb_filter "Chroma Comb. Filter Str." 0.6 0.0 1.0 0.05
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#pragma parameter luma_rate "Luma/Chroma Analysis Rate (typical 2.0)" 2.0 1.0 4.0 1.0
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#pragma parameter lpass "Luma Low Pass (sharpness)" 0.2 0.0 1.0 0.01
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#pragma parameter mini_hue "Hue Shift" 0.0 -6.3 6.3 0.05
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#pragma parameter ntsc_sat "Saturation" 3.0 0.0 6.0 0.05
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#pragma parameter ofq "Color Clock Frequency Mhz (typical 3.579)" 3.579 0.0 14.32 0.4473
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#pragma parameter snes_mode "Snes mode" 0.0 0.0 1.0 1.0
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#define comb_filter params.comb_filter
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#define lpass params.lpass
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#define ntsc_sat params.ntsc_sat
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#define ofq params.ofq
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#define luma_rate params.luma_rate
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#define mini_hue params.mini_hue
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#define snes_mode params.snes_mode
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layout(std140, set = 0, binding = 0) uniform UBO
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{
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mat4 MVP;
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vec4 OutputSize;
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vec4 OriginalSize;
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vec4 SourceSize;
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uint FrameCount;
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} global;
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#define OutputSize global.OutputSize
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#define SourceSize global.SourceSize
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#define OriginalSize global.OriginalSize
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#define FrameCount global.FrameCount
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#pragma stage vertex
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layout(location = 0) in vec4 Position;
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layout(location = 1) in vec2 TexCoord;
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layout(location = 0) out vec2 vTexCoord;
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void main()
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{
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gl_Position = global.MVP * Position;
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vTexCoord = TexCoord * 1.0001;
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}
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#pragma stage fragment
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layout(location = 0) in vec2 vTexCoord;
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layout(location = 0) out vec4 FragColor;
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layout(set = 0, binding = 2) uniform sampler2D Source;
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#define PI 3.14159265358979323846
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const mat3 RGBYUV = mat3(0.299, 0.587, 0.114,
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-0.299, -0.587, 0.886,
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0.701, -0.587, -0.114);
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const mat3 YUV2RGB = mat3(1.0, 0.0, 1.13983,
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1.0, -0.39465, -0.58060,
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1.0, 2.03211, 0.0);
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vec2 dx,dy;
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float compo0 ( float p, vec3 phase)
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{
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vec3 yiq = texture(Source,vTexCoord+p*dx).rgb*RGBYUV;
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return dot(vec3(1.0),yiq*phase);
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}
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float compo1 ( float p, vec3 phase)
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{
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vec3 yiq = texture(Source,vTexCoord+p*dx-dy).rgb*RGBYUV;
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return dot(vec3(1.0),yiq*phase);
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}
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void main() {
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dx = vec2(SourceSize.z/luma_rate,0.0);
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dy = vec2(0.0,SourceSize.w*0.25);
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vec3 final = vec3(0.0);
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float sum = 0.0;
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for (int n=-3; n<4; n++)
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{
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float p = float(n);
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float w = exp(-lpass*p*p);
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float snes_phase = 0.0;
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// vTexCoord is "time" variable, 52.6μs is time active pixels are displayed
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// 1000000 multiply (osc) /divide (52.6μs) are omitted as they cancel one another
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if (snes_mode == 1.0) snes_phase = mod(vTexCoord.y*262.0, 2.0)*PI;
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float carrier = (vTexCoord.x * ofq * 52.6 + p)*PI*0.5 + snes_phase;
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// every other NTSC line will be 180' shifted
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float carrier_up = carrier + PI;
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// lineup and line will cancel chroma/luma one another on comb
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vec3 phase = vec3(1.0,0.5*cos(carrier+mini_hue) ,0.5*sin(carrier+mini_hue));
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vec3 phase_up = vec3(1.0,0.5*cos(carrier_up+mini_hue),0.5*sin(carrier_up+mini_hue));
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vec3 phasefinal = vec3(1.0,ntsc_sat*cos(carrier) ,ntsc_sat*sin(carrier));
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float line_cur = compo0(p,phase)*w;
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float line_up = compo1(p,phase_up)*w;
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vec3 rgb = vec3(0.0);
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// luma comb
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rgb.r = (line_up+line_cur)/2.0;
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// chroma comb
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rgb.gb = vec2(line_cur-(line_up+line_cur)/2.0*comb_filter);
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final += rgb*phasefinal;
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sum += w;
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}
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final.r /= sum;
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final.gb /= 7.0;
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FragColor.rgb = final*YUV2RGB;
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}
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