port tiny_ntsc (#625)

* Add files via upload

* Add files via upload

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

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+#version 450
+
+layout(push_constant) uniform Push
+{
+  float something;
+} params;
+
+layout(std140, set = 0, binding = 0) uniform UBO
+{
+   mat4 MVP;
+   vec4 OutputSize;
+   vec4 OriginalSize;
+   vec4 SourceSize;
+   uint FrameCount;
+
+} global;
+
+#define OutputSize global.OutputSize
+#define SourceSize global.SourceSize
+#define OriginalSize global.OriginalSize
+#define FrameCount global.FrameCount
+
+#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;
+
+
+void main()
+{
+    vec2 ps = vec2(SourceSize.z,0.0);
+    vec3 res = texture(Source,vTexCoord).rgb*0.62;
+     res += texture(Source,vTexCoord+ps).rgb*0.39;
+     res += texture(Source,vTexCoord+3.0*ps).rgb*-0.1;
+     res += texture(Source,vTexCoord+5.0*ps).rgb*0.04;
+
+    FragColor.rgb = res;
+}

ntsc/shaders/ntsc-simple/tiny_ntsc.slang

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+#version 450
+
+layout(push_constant) uniform Push
+{
+  float comb,ln_delay,d_crawl,sharp_pix;
+} params;
+
+#pragma parameter comb "Comb Filter Strength" 0.8 0.0 1.0 0.05
+#pragma parameter ln_delay "NES/SNES Line Delay" 1.0 0.0 1.0 1.0
+#pragma parameter d_crawl "NES/SNES Dot Crawl" 1.0 0.0 1.0 1.0
+#pragma parameter sharp_pix "Sharper" 0.0 0.0 1.0 1.0
+
+#define comb params.comb
+#define ln_delay params.ln_delay
+#define d_crawl params.d_crawl
+#define sharp_pix params.sharp_pix
+
+layout(std140, set = 0, binding = 0) uniform UBO
+{
+   mat4 MVP;
+   vec4 OutputSize;
+   vec4 OriginalSize;
+   vec4 SourceSize;
+   uint FrameCount;
+
+} global;
+
+#define OutputSize global.OutputSize
+#define SourceSize global.SourceSize
+#define OriginalSize global.OriginalSize
+#define FrameCount global.FrameCount
+
+#pragma stage vertex
+layout(location = 0) in vec4 Position;
+layout(location = 1) in vec2 TexCoord;
+layout(location = 0) out vec2 vTexCoord;
+layout(location = 1) out vec2 ogl2pos;
+
+void main()
+{
+   gl_Position = global.MVP * Position;
+   vTexCoord = TexCoord * 1.0001;
+   ogl2pos = vTexCoord*SourceSize.xy;
+}
+
+#pragma stage fragment
+layout(location = 0) in vec2 vTexCoord;
+layout(location = 1) in vec2 ogl2pos;
+layout(location = 0) out vec4 FragColor;
+layout(set = 0, binding = 2) uniform sampler2D Source;
+
+#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;
+float timer = 0.0; if (d_crawl == 1.0) timer = mod(float(FrameCount),3.0);
+
+for (int i=0; i<2; 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 = ogl2pos.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 = (ogl2pos.x + n - line_delay +timer)*PI*NTSC_RES/OriginalSize.x;
+// comb filter line
+float phaseup = phase + PI;
+
+vec3 res   = texture(Source,vTexCoord -dxy + dxy*n).rgb*RGBYUV;
+vec3 resup = 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*0.5*comb;
+final.r += luma*w;
+final.gb += 2.0*vec2(chroma)*carrier.yz*w;
+sum += w;
+}
+
+final.rgb /= sum;
+FragColor.rgb = final*YUV2RGB;
+}

ntsc/tiny_ntsc.slangp

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+shaders = 2
+
+shader0 = shaders/ntsc-simple/tiny_ntsc.slang
+
+shader1 = shaders/ntsc-simple/kaizer-lp-small.slang