move fp and zebra into supershader, limit to gl3

app/src/main/assets/shader/supershader.fsh

@@ -0,0 +1,79 @@
+#version 300 es
+#line 1
+#extension GL_OES_EGL_image_external_essl3 : require
+precision mediump float;
+
+uniform samplerExternalOES sTexture;
+out vec4 Output;
+in vec2 texCoord;
+
+uniform float float_position;
+uniform float zebra_high;
+uniform float zebra_low;
+uniform bool show_zebra;
+uniform bool show_focuspeak;
+
+uniform vec4 peak_color;
+uniform float peak_strength;
+
+vec4 getZebra(vec2 texS, vec4 color, float pos,float high,float low)
+{
+    vec4 out_color;
+    if(fract((texS.x + texS.y)*(20.0+pos)) > 0.9)
+    {
+        float gray = (color.r + color.g +color.b) /3.0;
+        if(gray > (1.0 - high))
+        out_color = mix(color,vec4(1.0, 0.0, 0.0, 1.0),gray);
+        else if(gray < low)
+        out_color =  mix(color,vec4(0.0, 0.4, 1.0, 1.0),1.0-gray);
+        else
+        out_color = color;
+    }
+    else if(fract((texS.x - texS.y)*(20.0+pos)) > 0.9)
+    {
+        float gray = (color.r + color.g +color.b) /3.0;
+        if(gray > (1.0 - high))
+        out_color = mix(color,vec4(1.0, 0.0, 0.0, 1.0),gray);
+        else if(gray < low)
+        out_color =  mix(color,vec4(0.0, 0.4, 1.0, 1.0),1.0-gray);
+        else
+        out_color = color;
+    }
+    else
+    out_color = color;
+    return out_color;
+}
+
+void main() {
+    vec2 texSize = texCoord.xy;
+    vec4 color = texture(sTexture,texSize);
+    vec4 out_color = color;
+    if (show_zebra)
+        out_color = getZebra(texSize, color,float_position,zebra_high,zebra_low);
+
+    if(show_focuspeak)
+    {
+        vec2 size = vec2(textureSize(sTexture, 0));
+        float w = 1.0 / size.x;
+        float h = 1.0 / size.y;
+        vec4 n[9];
+        n[0] = texture(sTexture, texCoord + vec2( -w, -h));
+        n[1] = texture(sTexture, texCoord + vec2(0.0, -h));
+        n[2] = texture(sTexture, texCoord + vec2(  w, -h));
+        n[3] = texture(sTexture, texCoord + vec2( -w, 0.0));
+        n[4] = texture(sTexture, texCoord);
+        n[5] = texture(sTexture, texCoord + vec2(  w, 0.0));
+        n[6] = texture(sTexture, texCoord + vec2( -w, h));
+        n[7] = texture(sTexture, texCoord + vec2(0.0, h));
+        n[8] = texture(sTexture, texCoord + vec2(  w, h));
+
+        vec4 sobel_edge_h = n[2] + (peak_strength*n[5]) + n[8] - (n[0] + (peak_strength*n[3]) + n[6]);
+        vec4 sobel_edge_v = n[0] + (peak_strength*n[1]) + n[2] - (n[6] + (peak_strength*n[7]) + n[8]);
+        vec4 sobel = sqrt(((sobel_edge_h * sobel_edge_h) + (sobel_edge_v * sobel_edge_v)));
+        if(sobel == min(sobel, vec4(0.3,0.3,0.3,1)))
+            sobel = vec4(0,0,0,1);
+        out_color = mix(out_color, peak_color, sobel);
+    }
+
+    Output = out_color;
+}