Add shader hill1ch.frag

kde/plasmoid/contents/shaders/hill1ch.frag

@@ -0,0 +1,40 @@
+uniform sampler2D tex1;
+in mediump vec2 qt_TexCoord0;
+out vec4 out_Color;
+
+float height1(float distanc,float raw_height){
+    return raw_height-distanc;
+}
+
+float height2(float distanc,float raw_height){
+    return raw_height/(1+distanc*distanc);
+}
+
+float height(float distanc,float raw_height){
+    return raw_height*exp(-distanc*distanc*3);
+}
+
+void main()
+{    
+    float px_step=0.0005;
+    int max_distance=40;
+
+    float h=1-qt_TexCoord0.y;
+
+    out_Color=vec4(0,0,0,0);
+    float max_nb=0;
+    for(int i=-max_distance; i<max_distance+1; i++) {
+        float distanc=abs(i)/1.0/max_distance;
+        float x=qt_TexCoord0.x+i*px_step;
+        x=int(x*2000)/2000.0;
+
+        vec4 raw=texture(tex1, vec2(x,0.5));
+        float raw_max=(raw.g+raw.r)/2.;
+
+        if(h <=height(distanc,raw_max))
+            if(raw_max>max_nb){
+                max_nb=raw_max;
+                out_Color=vec4(getRGB(5*x),1.);
+            }
+    }
+}