Striped mapmodes

1 files changed, 6 insertions, 0 deletions

diff --git a/game/src/Game/GameSession/ProvinceIndexSampler.gdshaderinc b/game/src/Game/GameSession/ProvinceIndexSampler.gdshaderinc
index 65f73d8..1adcd95 100644
--- a/game/src/Game/GameSession/ProvinceIndexSampler.gdshaderinc
+++ b/game/src/Game/GameSession/ProvinceIndexSampler.gdshaderinc
@@ -4,15 +4,21 @@ uniform sampler2DArray province_shape_tex : repeat_enable, filter_nearest;
 // Province shape subdivisions
 uniform vec2 province_shape_subdivisions;
 
+// Convert a vector of 3 normalised floats to a vector of 3 unsigned bytes
 uvec3 vec3_to_uvec3(vec3 v) {
 	return uvec3(v * 255.0);
 }
+
+// Create a uint triplet describing the province and terrain data at a map-space UV coordinate:
+// (u, v) -> (province index bottom byte, province index top byte, terrain index byte)
 uvec3 read_uvec3(vec2 uv) {
 	uv *= province_shape_subdivisions;
 	vec2 subdivision_coords = mod(floor(uv),  province_shape_subdivisions);
 	float idx = subdivision_coords.x + subdivision_coords.y * province_shape_subdivisions.x;
 	return vec3_to_uvec3(texture(province_shape_tex, vec3(uv, idx)).rgb);
 }
+
+// Combine a (lower byte, upper byte) uint pair into a single 2-byte uint
 uint uvec2_to_uint(uvec2 v) {
 	return (v.y << 8u) | v.x;
 }