Graphical changes.

assets/shaders/glsl/text_line_f.glsl

@@ -12,6 +12,37 @@ vec4 gamma_correct(vec4 colour) {
 	return vec4(pow(colour.rgb, vec3(1.f / gamma)), colour.a);
 }
 
+
+float clamp(float x, float lowerlimit, float upperlimit) {
+  if (x < lowerlimit) return lowerlimit;
+  if (x > upperlimit) return upperlimit;
+  return x;
+}
+
+float smoothstep (float edge0, float edge1, float x) {
+   x = clamp((x - edge0) / (edge1 - edge0), 0.1f, 1.f);
+
+   return x * x * (3.0f - 2.0f * x);
+}
+
+
+float get_value(float d) {
+    float value = 1.f;    
+    if (d > 0.5f) {
+        return 0.f;
+    } else if ((d > 0.500f) && (d < 0.510f)) {
+        value = 1.f - smoothstep(0.500f, 0.510f, d);
+    } else {
+        value = 1.f;
+    }
+    return value;
+}
+
+float get_opacity(float d) {    
+    float t = max(0.0f, d * 16.0f - 7.0f);
+    return pow(t, 5.f);
+}
+
 void main() {
 	float border_size = 0.022f;
 	vec3 inner_color = vec3(1.0 - is_black, 1.0 - is_black, 1.0 - is_black);
@@ -20,15 +51,25 @@ void main() {
     outer_color = mix(inner_color, outer_color, text_size * 40.f);
 
 	vec4 color_in = texture(texture_sampler, vec2(tex_coord.rg));
-	if(color_in.r > 0.5) {
-		frag_color = vec4(inner_color, 1.0f);
-	} else if(color_in.r > 0.495) {
-		frag_color = vec4(mix(inner_color, outer_color,  1.0f - (color_in.r - 0.5f) * 200.0f), 1.0f);
-	} else {
-		float t = max(0.0f, color_in.r * 16.0f - 7.0f);
-		frag_color = vec4(outer_color, pow(t, 5.f));
-	}
-
-	frag_color.a *= opacity;
+
+    float dist = color_in.r;
+    vec2 ddist = vec2(dFdx(dist), dFdy(dist));
+    float pixel_distance = length(ddist) * 0.1f;
+
+    float average_value = 0.f;
+    for (int i = -5; i <= 5; i++) {
+        average_value += get_value(dist + i * pixel_distance);
+    }
+
+    float average_opacity = 0.f;
+    for (int i = -5; i <= 5; i++) {
+        average_opacity += get_opacity(dist + i * pixel_distance);
+    }
+
+    average_value /= 11.f;
+    average_opacity /= 11.f;
+
+
+    frag_color = vec4(mix(inner_color, outer_color, average_value), average_opacity * opacity);
 	frag_color = gamma_correct(frag_color);
 }

src/map/map.cpp

@@ -597,7 +597,6 @@ void display_data::render(sys::state& state, glm::vec2 screen_size, glm::vec2 of
 
 	//glMultiDrawArrays(GL_TRIANGLE_STRIP, coastal_starts.data(), coastal_counts.data(), GLsizei(coastal_starts.size()));
 
-	// impassible borders
 	glActiveTexture(GL_TEXTURE0);
 	glBindTexture(GL_TEXTURE_2D, textures[texture_provinces]);
 	glActiveTexture(GL_TEXTURE1);
@@ -624,8 +623,9 @@ void display_data::render(sys::state& state, glm::vec2 screen_size, glm::vec2 of
 				}
 			}
 		}
+		// impassible borders
 		{
-			glUniform1f(shader_uniforms[shader_borders][uniform_width], 0.00085f); // width
+			glUniform1f(shader_uniforms[shader_borders][uniform_width], 0.0004f); // width
 			glActiveTexture(GL_TEXTURE2);
 			glBindTexture(GL_TEXTURE_2D, textures[texture_imp_border]);
 			for(auto b : borders) {