Map marker work

shaders/void_composite.gdshader

@@ -1,52 +1,23 @@
 shader_type canvas_item;
 render_mode unshaded;
 
-const vec2 OFFSETS[8] = {
-	vec2(-0.71, -0.71), 
-	vec2(-1, 0), 
-	vec2(-0.71, 0.71), 
-	vec2(0, -1), 
-	vec2(0, 1), 
-	vec2(0.71, -0.71), 
-	vec2(1, 0), 
-	vec2(0.71, 0.71)
-};
-
-uniform bool ripple = false;
 uniform float line_thickness : hint_range(0.0, 100.0);
 uniform vec4 line_color : source_color = vec4(1.0);
 uniform sampler2D screen_texture : hint_screen_texture, repeat_disable, filter_nearest;
 
+
+
 void fragment() {
-	// Get the size of the pixels on screen, and create a variable for out outline
-	vec2 size = line_thickness * SCREEN_PIXEL_SIZE;
-	float outline = 0.0;
-
-	// Project in each direction, and add up the alpha of each projection.
-	// This is similar to picking a point, hit testing in 8 directions, and
-	// returning true if the hit test works
-	for (int i = 0; i < OFFSETS.length(); i++) {
-		vec2 coordinate_offset = SCREEN_UV + size * OFFSETS[i];
-		outline += texture(screen_texture, coordinate_offset).a;
-	}
-	
-	// Force outline to 1 or 0
-	//outline = sign(outline);
-	outline = .4 * (outline / 8.0) + .6 * sign(outline);
-	// Get the texture from the screen
-	vec4 c = texture(screen_texture, SCREEN_UV);
-
-	
-	if(ripple){
-		c.rgb = line_color.rgb;
-		COLOR = c;
-	}else{
-		// If the alpha exists at least a little bit, amplify the colors.
-		// This ensures alpha and colors remain precise even when reading from screen.
-		if (c.a > 0.0001) {
-			c.rgb /= c.a;
+	vec2 size = SCREEN_PIXEL_SIZE * float(line_thickness*2.0);
+	float line_alpha = 0.0;
+	for (float i = -size.x; i <= size.x; i += SCREEN_PIXEL_SIZE.x) {
+		for (float j = -size.y; j <= size.y; j += SCREEN_PIXEL_SIZE.y) {
+			line_alpha += texture(screen_texture, SCREEN_UV + vec2(i, j)).a;
 		}
-		COLOR = mix(c, line_color, outline - c.a);
 	}
-	
+	float div = size.x*2.0/SCREEN_PIXEL_SIZE.x + size.y*2.0/SCREEN_PIXEL_SIZE.y;
+	line_alpha = .2 * (line_alpha / div) + 0.0 * sign(line_alpha);
+	vec4 colour = texture(screen_texture, SCREEN_UV);
+	vec4 outline = vec4(line_color.rgb, min(line_alpha, 1.0));
+	COLOR *= mix(outline, colour, colour.a);
 }