game/src/GameSession/TerrainMap.gdshader


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shader_type spatial;

render_mode unshaded;

// Cosmetic terrain texture
uniform sampler2D terrain_tex: source_color, repeat_enable;
// Province shape texture
uniform sampler2D province_tex: source_color, repeat_enable;
// Position of the mouse over the map mesh in UV coords
uniform vec2 hover_pos;
// Position in UV coords of a pixel belonging to the currently selected province
uniform vec2 selected_pos;

const vec3 NULL_COLOUR = vec3(0.0);

void fragment() {
   vec3 terrain_colour = texture(terrain_tex, UV).rgb;
   vec3 prov_colour = texture(province_tex, UV).rgb;
   vec3 hover_colour = texture(province_tex, hover_pos).rgb;
   vec3 selected_colour = texture(province_tex, selected_pos).rgb;
   // Boost prov_colour's contribution if it matches hover_colour or selected_colour
   float mix_val = float(prov_colour == hover_colour) * 0.3 + float(prov_colour == selected_colour) * 0.5;
   // Set to 0 if the province has NULL colour
   mix_val *= 1.0 - float(prov_colour ==  NULL_COLOUR);
   ALBEDO = mix(terrain_colour, prov_colour, mix_val);
}