1 files changed, 20 insertions, 3 deletions
diff --git a/game/src/GameSession/TerrainMap.gdshader b/game/src/GameSession/TerrainMap.gdshader
index 522e0f3..0c5f3e1 100644
--- a/game/src/GameSession/TerrainMap.gdshader
+++ b/game/src/GameSession/TerrainMap.gdshader
@@ -2,9 +2,26 @@ shader_type spatial;
 
 render_mode unshaded;
 
-uniform sampler2D tex: source_color, repeat_enable;
+// Cosmetic terrain texture
+uniform sampler2D terrain_tex: source_color, repeat_enable;
+// Province shape texture
+uniform sampler2D province_tex: source_color, repeat_enable;
+
+// Mouse position in UV coords over the map mesh
+uniform vec2 mouse_pos;
+
+// Transform map mesh UV coordinates to account for the extra
+// half map on either side. This takes the x-coord from [0 -> 1]
+// to [-0.5 -> 1.5], while leaving the y-coord unchanged.
+vec2 fix_uv(vec2 uv) {
+	return vec2(uv.x * 2.0 - 0.5, uv.y);
+}
 
 void fragment() {
-	vec2 new_uv = vec2(UV.x * 2.0 - 0.5, UV.y);
-	ALBEDO = texture(tex, new_uv).rgb;
+	vec2 fixed_uv = fix_uv(UV);
+	vec3 prov_colour = texture(province_tex, fixed_uv).rgb;
+	vec3 mouse_colour = texture(province_tex, fix_uv(mouse_pos)).rgb;
+	// Boost prov_colour's contribution if the mouse is over that colour and it isn't (0,0,0)
+	float mix_val = prov_colour == mouse_colour && mouse_colour != vec3(0.0) ? 0.8 : 0.4;
+	ALBEDO = mix(texture(terrain_tex, fixed_uv).rgb, prov_colour, mix_val);
 }