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shader_type spatial;
render_mode unshaded;
// Cosmetic terrain texture
uniform sampler2D terrain_tex: source_color, repeat_enable, filter_linear;
// Province index texture
uniform sampler2D province_index_tex : repeat_enable, filter_nearest;
// Province colour texture
uniform sampler2D province_colour_tex: source_color, repeat_enable, filter_nearest;
// 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;
uvec2 vec2_to_uvec2(vec2 v) {
return uvec2(v * 255.0);
}
uint uvec2_to_uint(uvec2 v) {
return (v.y << 8u) | v.x;
}
uvec2 read_uvec2(sampler2D tex, vec2 uv) {
return vec2_to_uvec2(texture(tex, uv).rg);
}
uint read_uint16(sampler2D tex, vec2 uv) {
return uvec2_to_uint(read_uvec2(tex, uv));
}
void fragment() {
uvec2 prov_idx_split = read_uvec2(province_index_tex, UV);
uint prov_index = uvec2_to_uint(prov_idx_split);
uint hover_index = read_uint16(province_index_tex, hover_pos);
uint selected_index = read_uint16(province_index_tex, selected_pos);
// Boost prov_colour's contribution if it matches hover_colour or selected_colour
float mix_val = float(prov_index == hover_index) * 0.3 + float(prov_index == selected_index) * 0.5;
// Don't mix if the province index is 0
mix_val *= float(prov_index != 0u);
vec3 terrain_colour = texture(terrain_tex, UV).rgb;
vec3 province_colour = texelFetch(province_colour_tex, ivec2(prov_idx_split), 0).rgb;
ALBEDO = mix(terrain_colour, province_colour, mix_val);
}
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zaaarf