add broadcast-crt like scanlines shader (#559)

* Add files via upload

* Add files via upload

* Update broadcast.glsl

scanlines/broadcast.glslp

@@ -0,0 +1,5 @@
+shaders = 1
+
+shader0 = shaders/broadcast.glsl
+filter_linear0 = false
+

scanlines/shaders/broadcast.glsl

@@ -0,0 +1,154 @@
+#version 110
+
+/*
+    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.
+*/
+
+#pragma parameter SCAN_STR "SCANLINES STRENGTH" 0.4 0.0 0.5 0.05
+#pragma parameter BEAM_LOW "SCANLINES BEAM LOW" 3.0 0.0 5.0 0.05  
+#pragma parameter BEAM_HIGH "SCANLINES BEAM HIGH" 0.75 0.0 5.0 0.05  
+#pragma parameter COLOR_BOOST "COLOR BOOST (BRIGHTNESS)" 1.5 1.0 5.0 0.05  
+
+#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;
+COMPAT_VARYING vec2 ogl2pos;
+COMPAT_VARYING vec2 invdims;
+COMPAT_VARYING vec2 maskpos;
+COMPAT_VARYING vec2 scale;
+
+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;
+
+#ifdef PARAMETER_UNIFORM
+uniform COMPAT_PRECISION float m_size;
+
+#else
+#define m_size 1.0
+
+#endif
+
+void main()
+{
+    gl_Position = MVPMatrix * VertexCoord;
+    TEX0.xy = TexCoord.xy*1.0001;
+    invdims = 1.0/TextureSize;
+    scale = TextureSize/InputSize;
+    maskpos = TEX0.xy*scale*OutputSize.xy;
+    ogl2pos = TEX0.xy*TextureSize;    
+}
+
+#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 sampler2D Texture;
+COMPAT_VARYING vec4 TEX0;
+COMPAT_VARYING vec2 ogl2pos;
+COMPAT_VARYING vec2 invdims;
+COMPAT_VARYING vec2 maskpos;
+COMPAT_VARYING vec2 scale;
+
+#define Source Texture
+#define vTexCoord TEX0.xy
+
+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;
+
+#ifdef PARAMETER_UNIFORM
+uniform COMPAT_PRECISION float BEAM_LOW;
+uniform COMPAT_PRECISION float BEAM_HIGH;
+uniform COMPAT_PRECISION float COLOR_BOOST;
+uniform COMPAT_PRECISION float SCAN_STR;
+#else
+#define BEAM_LOW 4.0
+#define BEAM_HIGH 1.0
+#define COLOR_BOOST 1.0
+#define SCAN_STR 0.5
+#endif
+
+#define GAMMA(color) color*color 
+#define PI 3.14159265358979323846 
+#define TAU 6.2831852
+
+void main()
+{   
+    vec2 dx = vec2(invdims.x*0.5, 0.0);
+    vec2 dy = vec2(0.0,invdims.y*0.5);
+
+    vec2 near = floor(ogl2pos)+0.5;
+    vec2 f = fract(ogl2pos);    
+         f = f*f*(3.0-2.0*f);
+         f.y = f.y*f.y;
+         f.y = f.y*f.y;
+    vec2 pos = (near + f)*invdims;     
+    
+    vec3 res1 = GAMMA(COMPAT_TEXTURE(Source,pos - dy - dx).rgb);
+    vec3 res2 = GAMMA(COMPAT_TEXTURE(Source,pos - dy + dx).rgb);
+    vec3 res3 = GAMMA(COMPAT_TEXTURE(Source,pos + dy - dx).rgb);
+    vec3 res4 = GAMMA(COMPAT_TEXTURE(Source,pos + dy + dx).rgb);
+
+    vec3 res01 = mix(res1, res2, f.x);
+    vec3 res02 = mix(res3, res4, f.x);
+
+    vec3 res = mix(res01, res02, f.y);
+    float l = max(max(res.r, res.g), res.b);
+    res *= COLOR_BOOST;
+    // SCANLINES
+    float s = SCAN_STR*sin(ogl2pos.y*TAU)+1.0-SCAN_STR;
+    float beam = mix(BEAM_LOW, BEAM_HIGH, l);
+    s = pow(s, beam);
+    res *= s;
+
+    FragColor.rgb = sqrt(res);
+}
+#endif