experimental minimap

* a lot of rework in MapView
* new APIs for UIMap

modules/game_shaders/map.frag

@@ -3,8 +3,84 @@ uniform vec4 color; // painter color
 uniform float time; // time in seconds since shader linkage
 uniform sampler2D texture; // map texture
 varying vec2 textureCoords; // map texture coords
+//uniform vec4 awareArea;
 
 void main()
 {
     gl_FragColor = texture2D(texture, textureCoords);
 }
+
+/*
+vec4 grayScale(vec4 color, float factor)
+{
+    float gray = dot(color.rgb, vec3(0.299, 0.587, 0.114));
+    return vec4(gray*factor + (1-factor)*color.r,
+                gray*factor + (1-factor)*color.g,
+                gray*factor + (1-factor)*color.b, 1);
+}
+
+// grayscale fog
+void main()
+{
+    vec4 color = texture2D(texture, textureCoords);
+    float dist = 0;
+    // left
+    if(textureCoords.x < awareArea.x && textureCoords.y < awareArea.y)
+        dist = distance(textureCoords, awareArea.xy);
+    else if(textureCoords.x < awareArea.x && textureCoords.y < awareArea.w)
+        dist = distance(textureCoords, vec2(awareArea.x, textureCoords.y));
+    else if(textureCoords.x < awareArea.x)
+        dist = distance(textureCoords, awareArea.xw);
+    // right
+    else if(textureCoords.x > awareArea.z && textureCoords.y < awareArea.y)
+        dist = distance(textureCoords, awareArea.zy);
+    else if(textureCoords.x > awareArea.z && textureCoords.y < awareArea.w)
+        dist = distance(textureCoords, vec2(awareArea.z, textureCoords.y));
+    else if(textureCoords.x > awareArea.z)
+        dist = distance(textureCoords, awareArea.zw);
+    // top
+    else if(textureCoords.y < awareArea.y)
+        dist = distance(textureCoords, vec2(textureCoords.x, awareArea.y));
+    // bottom
+    else if(textureCoords.y > awareArea.w)
+        dist = distance(textureCoords, vec2(textureCoords.x, awareArea.w));
+    if(dist > 0) {
+        float range = 0.01;
+        float factor = min(dist/range, 1.0);
+        color = grayScale(color, factor);
+        //color.rgb *= 1 - (factor * 0.5);
+    }
+    gl_FragColor = color;
+}
+*/
+
+/*
+sepia
+void main()
+{
+    vec4 color = texture2D(texture, textureCoords);
+    if(textureCoords.x < awareArea.x || textureCoords.y < awareArea.y || textureCoords.x > awareArea.z || textureCoords.y > awareArea.w) {
+        gl_FragColor.r = dot(color, vec4(.393, .769, .189, .0));
+        gl_FragColor.g = dot(color, vec4(.349, .686, .168, .0));
+        gl_FragColor.b = dot(color, vec4(.272, .534, .131, .0));
+        gl_FragColor.a = 1;
+    } else
+        gl_FragColor = color;
+}
+*/
+
+/*
+void main()
+{
+    vec4 color = texture2D(texture, textureCoords);
+    vec2 awareRange = (awareArea.zw - awareArea.xy)/2.0;
+    float dist = distance(textureCoords, awareArea.xy + awareRange);
+    float start = min(awareRange.x, awareRange.y);
+    float range = awareRange*0.1;
+    float endFactor = 0.3;
+    if(dist >= start) {
+        color.rgb *= 1 - (min((dist - start)/range, 1.0) * (2.0 - endFactor));
+    }
+    gl_FragColor = color;
+}
+*/