insert search code only when none bg

Author: Xtarsia

src/shaders/backgrounds.glsl

@@ -1,6 +1,32 @@
 // Copyright © 2025 Cory Petkovsek, Roope Palmroos, and Contributors.
 
 R"(
+//INSERT: INDEX_COORD_STANDARD
+ivec3 get_index_coord(const vec2 uv, const int search) {
+	vec2 r_uv = round(uv);
+	ivec2 pos = ivec2(floor(r_uv * _region_texel_size)) + (_region_map_size / 2);
+	int bounds = int(uint(pos.x | pos.y) < uint(_region_map_size));
+	int layer_index = _region_map[pos.y * _region_map_size + pos.x] * bounds - 1;
+	return ivec3(ivec2(mod(r_uv, _region_size)), layer_index);
+}
+
+//INSERT: INDEX_COORD_BG_NONE
+ivec3 get_index_coord(const vec2 uv, const int search) {
+	vec2 r_uv = round(uv);
+	vec2 o_uv = mod(r_uv, _region_size);
+	ivec2 pos;
+	int bounds, layer_index = -1;
+	for (int i = -1; i < clamp(search, SKIP_PASS, FRAGMENT_PASS); i++) {
+		if ((layer_index == -1 && _background_mode == 0u ) || i < 0) {
+			r_uv -= i == -1 ? vec2(0.0) : vec2(float(o_uv.x <= o_uv.y), float(o_uv.y <= o_uv.x));
+			pos = ivec2(floor((r_uv) * _region_texel_size)) + (_region_map_size / 2);
+			bounds = int(uint(pos.x | pos.y) < uint(_region_map_size));
+			layer_index = (_region_map[ pos.y * _region_map_size + pos.x ] * bounds - 1);
+		}
+	}
+	return ivec3(ivec2(mod(r_uv, _region_size)), layer_index);
+}
+
 //INSERT: FLAT_UNIFORMS
 uniform float ground_level : hint_range(-1000., 1000.) = 0.0;
 uniform float region_blend : hint_range(.001, 1., 0.001) = 0.25;

src/shaders/main.glsl

@@ -118,21 +118,8 @@ varying vec3 v_camera_pos;
 // Returns ivec3 with:
 // XY: (0 to _region_size - 1) coordinates within a region
 // Z: layer index used for texturearrays, -1 if not in a region
-ivec3 get_index_coord(const vec2 uv, const int search) {
-	vec2 r_uv = round(uv);
-	vec2 o_uv = mod(r_uv, _region_size);
-	ivec2 pos;
-	int bounds, layer_index = -1;
-	for (int i = -1; i < clamp(search, SKIP_PASS, FRAGMENT_PASS); i++) {
-		if ((layer_index == -1 && _background_mode == 0u ) || i < 0) {
-			r_uv -= i == -1 ? vec2(0.0) : vec2(float(o_uv.x <= o_uv.y), float(o_uv.y <= o_uv.x));
-			pos = ivec2(floor((r_uv) * _region_texel_size)) + (_region_map_size / 2);
-			bounds = int(uint(pos.x | pos.y) < uint(_region_map_size));
-			layer_index = (_region_map[ pos.y * _region_map_size + pos.x ] * bounds - 1);
-		}
-	}
-	return ivec3(ivec2(mod(r_uv, _region_size)), layer_index);
-}
+//INSERT: INDEX_COORD_STANDARD
+//INSERT: INDEX_COORD_BG_NONE
 
 // Takes in descaled (world_space / region_size) world to region space XZ (UV2) coordinates, returns vec3 with:
 // XY: (0. to 1.) coordinates within a region

src/terrain_3d_material.cpp

@@ -139,6 +139,11 @@ String Terrain3DMaterial::_apply_inserts(const String &p_shader, const Array &p_
 String Terrain3DMaterial::_generate_shader_code() const {
 	LOG(INFO, "Generating default shader code");
 	Array excludes;
+	if (_world_background != NONE) {
+		excludes.push_back("INDEX_COORD_BG_NONE");
+	} else {
+		excludes.push_back("INDEX_COORD_STANDARD");
+	}
 	if (_world_background != FLAT) {
 		excludes.push_back("FLAT_UNIFORMS");
 		excludes.push_back("FLAT_FUNCTIONS");