add tiny_ntsc shader (#486)

* Add files via upload

* Add files via upload

* Update tiny_ntsc.glsl

* Update tiny_ntsc.glsl

ntsc/shaders/ntsc-simple/kaizer-lp-small.glsl

@@ -0,0 +1,117 @@
+#version 110
+
+/*
+kaizer-low-pass DariusG 2023
+
+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.
+*/
+
+#if defined(VERTEX)
+
+#if __VERSION__ >= 130
+#define COMPAT_VARYING out
+#define COMPAT_ATTRIBUTE in
+#define COMPAT_TEXTURE texture
+#else
+#define COMPAT_VARYING varying 
+#define COMPAT_ATTRIBUTE attribute 
+#define COMPAT_TEXTURE texture2D
+#endif
+
+#ifdef GL_ES
+#define COMPAT_PRECISION mediump
+#else
+#define COMPAT_PRECISION
+#endif
+
+COMPAT_ATTRIBUTE vec4 VertexCoord;
+COMPAT_ATTRIBUTE vec4 COLOR;
+COMPAT_ATTRIBUTE vec4 TexCoord;
+COMPAT_VARYING vec4 COL0;
+COMPAT_VARYING vec4 TEX0;
+
+vec4 _oPosition1; 
+uniform mat4 MVPMatrix;
+uniform COMPAT_PRECISION int FrameDirection;
+uniform COMPAT_PRECISION int FrameCount;
+uniform COMPAT_PRECISION vec2 OutputSize;
+uniform COMPAT_PRECISION vec2 TextureSize;
+uniform COMPAT_PRECISION vec2 InputSize;
+
+// compatibility #defines
+#define vTexCoord TEX0.xy
+#define SourceSize vec4(TextureSize, 1.0 / TextureSize) //either TextureSize or InputSize
+#define OutSize vec4(OutputSize, 1.0 / OutputSize)
+
+#ifdef PARAMETER_UNIFORM
+uniform COMPAT_PRECISION float WHATEVER;
+#else
+#define WHATEVER 0.0
+#endif
+
+void main()
+{
+    gl_Position = MVPMatrix * VertexCoord;
+    TEX0.xy = TexCoord.xy*1.0001;
+}
+
+#elif defined(FRAGMENT)
+
+#if __VERSION__ >= 130
+#define COMPAT_VARYING in
+#define COMPAT_TEXTURE texture
+out vec4 FragColor;
+#else
+#define COMPAT_VARYING varying
+#define FragColor gl_FragColor
+#define COMPAT_TEXTURE texture2D
+#endif
+
+#ifdef GL_ES
+#ifdef GL_FRAGMENT_PRECISION_HIGH
+precision highp float;
+#else
+precision mediump float;
+#endif
+#define COMPAT_PRECISION mediump
+#else
+#define COMPAT_PRECISION
+#endif
+
+uniform COMPAT_PRECISION int FrameDirection;
+uniform COMPAT_PRECISION int FrameCount;
+uniform COMPAT_PRECISION vec2 OutputSize;
+uniform COMPAT_PRECISION vec2 TextureSize;
+uniform COMPAT_PRECISION vec2 InputSize;
+uniform sampler2D Texture;
+COMPAT_VARYING vec4 TEX0;
+
+// compatibility #defines
+#define vTexCoord TEX0.xy
+#define Source Texture
+#define SourceSize vec4(TextureSize, 1.0 / TextureSize) //either TextureSize or InputSize
+#define OutSize vec4(OutputSize, 1.0 / OutputSize)
+
+#ifdef PARAMETER_UNIFORM
+uniform COMPAT_PRECISION float compo;
+uniform COMPAT_PRECISION float rainbow;
+
+#else
+#define compo 1.0
+#define rainbow 1.0
+#endif
+
+void main()
+{
+    vec2 ps = vec2(SourceSize.z,0.0);
+    vec3 res = COMPAT_TEXTURE(Source,vTexCoord).rgb*0.62;
+     res += COMPAT_TEXTURE(Source,vTexCoord+ps).rgb*0.39;
+     res += COMPAT_TEXTURE(Source,vTexCoord+3.0*ps).rgb*-0.1;
+     res += COMPAT_TEXTURE(Source,vTexCoord+5.0*ps).rgb*0.04;
+
+    FragColor.rgb = res;
+}
+#endif

ntsc/shaders/ntsc-simple/tiny_ntsc.glsl

@@ -0,0 +1,164 @@
+#version 110
+
+#pragma parameter comb "Comb Filter" 0.7 0.0 1.0 0.05
+#pragma parameter ln_delay "NES/SNES Line Delay" 1.0 0.0 1.0 1.0
+#pragma parameter sharp_pix "Sharper" 0.0 0.0 1.0 1.0
+
+#if defined(VERTEX)
+
+#if __VERSION__ >= 130
+#define COMPAT_VARYING out
+#define COMPAT_ATTRIBUTE in
+#define COMPAT_TEXTURE texture
+#else
+#define COMPAT_VARYING varying 
+#define COMPAT_ATTRIBUTE attribute 
+#define COMPAT_TEXTURE texture2D
+#endif
+
+#ifdef GL_ES
+#define COMPAT_PRECISION mediump
+#else
+#define COMPAT_PRECISION
+#endif
+
+COMPAT_ATTRIBUTE vec4 VertexCoord;
+COMPAT_ATTRIBUTE vec4 COLOR;
+COMPAT_ATTRIBUTE vec4 TexCoord;
+COMPAT_VARYING vec4 COL0;
+COMPAT_VARYING vec4 TEX0;
+
+vec4 _oPosition1; 
+uniform mat4 MVPMatrix;
+uniform COMPAT_PRECISION int FrameDirection;
+uniform COMPAT_PRECISION int FrameCount;
+uniform COMPAT_PRECISION vec2 OutputSize;
+uniform COMPAT_PRECISION vec2 TextureSize;
+uniform COMPAT_PRECISION vec2 InputSize;
+
+// compatibility #defines
+#define vTexCoord TEX0.xy
+#define SourceSize vec4(TextureSize, 1.0 / TextureSize) //either TextureSize or InputSize
+#define OutSize vec4(OutputSize, 1.0 / OutputSize)
+
+#ifdef PARAMETER_UNIFORM
+uniform COMPAT_PRECISION float WHATEVER;
+#else
+#define WHATEVER 0.0
+#endif
+
+void main()
+{
+    gl_Position = MVPMatrix * VertexCoord;
+    TEX0.xy = TexCoord.xy*1.0001;
+}
+
+#elif defined(FRAGMENT)
+
+#if __VERSION__ >= 130
+#define COMPAT_VARYING in
+#define COMPAT_TEXTURE texture
+out vec4 FragColor;
+#else
+#define COMPAT_VARYING varying
+#define FragColor gl_FragColor
+#define COMPAT_TEXTURE texture2D
+#endif
+
+#ifdef GL_ES
+#ifdef GL_FRAGMENT_PRECISION_HIGH
+precision highp float;
+#else
+precision mediump float;
+#endif
+#define COMPAT_PRECISION mediump
+#else
+#define COMPAT_PRECISION
+#endif
+
+uniform COMPAT_PRECISION int FrameDirection;
+uniform COMPAT_PRECISION int FrameCount;
+uniform COMPAT_PRECISION vec2 OutputSize;
+uniform COMPAT_PRECISION vec2 TextureSize;
+uniform COMPAT_PRECISION vec2 InputSize;
+uniform sampler2D Texture;
+COMPAT_VARYING vec4 TEX0;
+
+// compatibility #defines
+#define vTexCoord TEX0.xy
+#define Source Texture
+#define SourceSize vec4(TextureSize, 1.0 / TextureSize) //either TextureSize or InputSize
+#define OutSize vec4(OutputSize, 1.0 / OutputSize)
+
+#ifdef PARAMETER_UNIFORM
+uniform COMPAT_PRECISION float comb;
+uniform COMPAT_PRECISION float ln_delay;
+uniform COMPAT_PRECISION float sharp_pix;
+
+#else
+#define comb 0.6
+#define ln_delay 1.0
+#define sharp_pix 0.0
+
+#endif
+
+#define PI   3.14159265358979323846
+
+mat3 RGBYUV = mat3(0.299, 0.587, 0.114,
+                        -0.299, -0.587, 0.886, 
+                         0.701, -0.587, -0.114);
+
+mat3 YUV2RGB = mat3(1.0, 0.0, 1.13983,
+                          1.0, -0.39465, -0.58060,
+                          1.0, 2.03211, 0.0);
+
+// max 170.666 color "dots" per line
+#define NTSC_RES 170.6666
+
+void main() 
+{
+float pixsize = 0.75; 
+if (sharp_pix == 1.0) pixsize = 0.5;
+vec2 dxy = vec2(SourceSize.z*pixsize,0.0);
+vec2 dy = vec2(0.0,SourceSize.w*0.125);
+vec3 final = vec3(0.0);
+float sum = 0.0;
+int N = 2; 
+float timer = 0.0; if (InputSize.x < 300.0) timer = mod(float(FrameCount/2),2.0);
+
+for (int i=0; i<N; i++)
+{
+float n = float(i);
+float w = exp(-0.15*n*n); // gaussian low pass
+
+float line_delay = 0.0;
+if (ln_delay == 1.0) line_delay = vTexCoord.y*SourceSize.y; // snes line delay
+//snes line delay deployed at 170/256, 2/3 of pi(180'), 120' or 1/3 lines as in real snes
+float phase = (vTexCoord.x*SourceSize.x + n - line_delay +timer )*PI*NTSC_RES/InputSize.x;
+// comb filter line
+float phaseup = phase + PI;
+
+vec3 res = COMPAT_TEXTURE(Source,vTexCoord -dxy + dxy*n).rgb*RGBYUV;
+vec3 resup = COMPAT_TEXTURE(Source,vTexCoord -dxy + dxy*n +dy).rgb*RGBYUV;
+
+vec3 carrier = vec3(1.0, sin(phase), cos(phase));
+vec3 carrierup = vec3(1.0, sin(phaseup), cos(phaseup));
+
+res    *= carrier;
+resup  *= carrierup;
+
+float line   = dot(vec3(0.5),res);
+float lineup = dot(vec3(0.5),resup);
+// comb luma is line adding previous line, chroma is cancelled!
+float luma   = line + lineup;
+// comb chroma is line subtracting luma we already have!
+float chroma = line - luma/2.0*comb;
+final.r += luma*w;
+final.gb += 2.0*vec2(chroma)*carrier.yz*w;
+sum += w;
+}
+
+final.rgb /= sum;
+FragColor.rgb = final*YUV2RGB;
+}
+#endif

ntsc/tiny_ntsc.glslp

@@ -0,0 +1,4 @@
+shaders = "2"
+
+shader0 = "shaders/ntsc-simple/tiny_ntsc.glsl"
+shader1 = "shaders/ntsc-simple/kaizer-lp-small.glsl"