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shader_type spatial;
render_mode unshaded;
#include "res://src/Game/GameSession/ProvinceIndexSampler.gdshaderinc"
// Province colour texture
uniform sampler2D province_colour_tex: source_color, repeat_enable, filter_nearest;
// Index of the mouse over the map mesh
uniform uint hover_index;
// Index of the currently selected province
uniform uint selected_index;
// Cosmetic terrain textures
uniform sampler2DArray terrain_tex: source_color, repeat_enable, filter_linear;
// The number of times the terrain textures should tile vertically
uniform float terrain_tile_factor;
// Map stripe mask texture
uniform sampler2D stripe_tex: source_color, repeat_enable, filter_linear;
// The number of times the stripe texture should tile vertically
uniform float stripe_tile_factor;
// Land map tint
uniform sampler2D colormap_land_tex: source_color, repeat_enable, filter_linear;
// Water map tint
uniform sampler2D colormap_water_tex: source_color, repeat_enable, filter_linear;
const vec3 highlight_colour = vec3(1.0);
vec3 get_terrain_colour(
vec2 uv, vec2 corner, vec2 half_pixel_size, // Components for calculating province sampling UV
float stripe_mask, // Stripe mask value - between 0 (base) and 1 (stripe)
vec2 terrain_uv, // UV coordinates scaled for terrain texture tiling
vec3 land_tint_colour, vec3 water_tint_colour // Colours for tinting terrain
) {
uvec3 province_data = read_uvec3(fma(corner, half_pixel_size, uv));
uint province_index = uvec2_to_uint(province_data.rg);
uint terrain_index = province_data.b;
province_data.r *= 2u; // Double "x coordinate" as colours come in (base, stripe) pairs
vec4 province_base_colour = texelFetch(province_colour_tex, ivec2(province_data.rg), 0);
province_data.r += 1u; // Add 1 to "x coordinate" to move from base to strip colour
vec4 province_stripe_colour = texelFetch(province_colour_tex, ivec2(province_data.rg), 0);
vec4 province_colour = mix(province_base_colour, province_stripe_colour, stripe_mask);
vec3 terrain_colour = texture(terrain_tex, vec3(terrain_uv, float(terrain_index))).rgb;
vec3 tint_colour = mix(land_tint_colour, water_tint_colour, float(terrain_index == 0u));
vec3 tinted_terrain_colour = mix(terrain_colour, tint_colour, 0.3);
vec3 mixed_colour = mix(tinted_terrain_colour, province_colour.rgb, province_colour.a);
float highlight_mix_val = 0.4 * (float(province_index == hover_index) + float(province_index == selected_index));
return mix(mixed_colour, highlight_colour, highlight_mix_val);
}
// Rescale UV coordinates to remove squashing caused by normalisation
vec2 denormalise(vec2 uv, vec2 dims) {
return vec2(uv.x * dims.x / dims.y, uv.y);
}
vec3 mix_terrain_colour(vec2 uv) {
vec2 map_size = vec2(textureSize(province_shape_tex, 0).xy) * province_shape_subdivisions;
vec2 uv_centred = fma(uv, map_size, vec2(0.5));
vec2 pixel_offset = fract(uv_centred);
vec2 half_pixel_size = 0.49 / map_size;
// UV coords adjusted to remove squashing caused by normalisation relative to map dimensions
vec2 unscaled_uv = denormalise(uv, map_size);
vec2 stripe_uv = unscaled_uv * stripe_tile_factor;
// Stripe mask value - between 0 (base) and 1 (stripe)
float stripe_mask = texture(stripe_tex, stripe_uv).b;
vec2 terrain_uv = unscaled_uv * terrain_tile_factor;
vec2 colormap_uv = vec2(uv.x, 1.0 - uv.y);
vec3 colormap_land_colour = texture(colormap_land_tex, colormap_uv).rgb;
vec3 colormap_water_colour = texture(colormap_water_tex, colormap_uv).rgb;
return mix(
mix(
get_terrain_colour(
uv, vec2(-1, -1), half_pixel_size, stripe_mask,
terrain_uv, colormap_land_colour, colormap_water_colour
),
get_terrain_colour(
uv, vec2(+1, -1), half_pixel_size, stripe_mask,
terrain_uv, colormap_land_colour, colormap_water_colour
), pixel_offset.x
),
mix(
get_terrain_colour(
uv, vec2(-1, +1), half_pixel_size, stripe_mask,
terrain_uv, colormap_land_colour, colormap_water_colour
),
get_terrain_colour(
uv, vec2(+1, +1), half_pixel_size, stripe_mask,
terrain_uv, colormap_land_colour, colormap_water_colour
), pixel_offset.x
),
pixel_offset.y
);
}
void fragment() {
vec3 terrain_colour = mix_terrain_colour(UV);
ALBEDO = terrain_colour;
}
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zaaarf