Highlight selected province on minimap

1 files changed, 12 insertions, 1 deletions

diff --git a/game/src/GameSession/Minimap.gdshader b/game/src/GameSession/Minimap.gdshader
index 9afd470..8b68108 100644
--- a/game/src/GameSession/Minimap.gdshader
+++ b/game/src/GameSession/Minimap.gdshader
@@ -2,6 +2,17 @@ shader_type canvas_item;
 
 #include "ProvinceIndexSampler.gdshaderinc"
 
+// Index of the currently selected province
+uniform uint selected_index;
+
+const vec3 land_colour = vec3(0.5);
+const vec3 selected_colour = vec3(1.0, 1.0, 0.0);
+
 void fragment() {
-	COLOR.rgb = mix(COLOR.rgb, vec3(0.5), float(read_uvec3(UV).b != 0u));
+	uvec3 data = read_uvec3(UV);
+	uint index = uvec2_to_uint(data.rg);
+	float is_land = float(data.b != 0u);
+	float is_selected = float(index == selected_index);
+	COLOR.rgb = mix(COLOR.rgb, land_colour, is_land);
+	COLOR.rgb = mix(COLOR.rgb, selected_colour, is_selected);
 }