Scatter plot fragment shader now creates smoother points.

pvt/src/rendering/shader_strings.cpp

@@ -957,6 +957,8 @@ void main()
 std::string scatter_plot_vert = R"(\
 #version 400
 
+uniform mat4  view;
+uniform mat4  projection;
 uniform float scale;
 
 in vec3 vertex  ;
@@ -966,7 +968,7 @@ flat out int vert_selected;
 
 void main()
 {
-  gl_Position   = vec4(vertex, 1.0);
+  gl_Position   = projection * view * vec4(vertex, 1.0);
   gl_PointSize  = scale;
   vert_selected = selected;
 }
@@ -974,6 +976,7 @@ void main()
 std::string scatter_plot_frag = R"(\
 #version 400
 
+uniform vec4 background_color;
 uniform vec4 normal_color    ;
 uniform vec4 selected_color  ;
 
@@ -983,15 +986,24 @@ out vec4 frag_color;
 
 void main()
 {
+  float radius = length(gl_PointCoord - vec2(0.5));
+  if(radius > 0.5)
+    discard;
+
+  vec4 color;
   if(vert_selected == 0)
-    frag_color = normal_color;
+    color = normal_color;
   else
-    frag_color = selected_color;
+    color = selected_color;
+
+  frag_color = mix(color, background_color, smoothstep(0.0, 0.6, radius));
 }
 )";
 std::string scatter_plot_click_vert = R"(\
 #version 400
 
+uniform mat4  view;
+uniform mat4  projection;
 uniform float scale;
 
 in vec3 vertex;
@@ -1001,7 +1013,7 @@ flat out int vert_id;
 
 void main()
 {
-  gl_Position  = vec4(vertex, 1.0);
+  gl_Position  = projection * view * vec4(vertex, 1.0);
   gl_PointSize = scale;
   vert_id      = id;
 }
@@ -1015,6 +1027,9 @@ out int frag_id;
 
 void main()
 {
+  if(length(gl_PointCoord - vec2(0.5)) > 0.5)
+    discard;
+
   frag_id = vert_id;
 }
 )";