wip insert search code only when none bg

Author: Xtarsia

src/shaders/backgrounds.glsl

@@ -1,6 +1,8 @@
 // Copyright © 2025 Cory Petkovsek, Roope Palmroos, and Contributors.
 
 R"(
+//INSERT: NONE_BACKGROUND
+#define BG_MODE_NONE
 //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

@@ -27,6 +27,7 @@ render_mode blend_mix, depth_draw_opaque, cull_back, diffuse_burley, specular_sc
 #define DIV_255 0.003921568627450 // 1. / 255.
 #define DIV_1024 0.0009765625 // 1. / 1024.
 #define TAU_16TH -0.392699081698724 // -TAU / 16.
+//INSERT: NONE_BACKGROUND
 
 // Inline Functions
 #define DECODE_BLEND(control) float(control >>14u & 0xFFu) * DIV_255
@@ -120,6 +121,7 @@ varying vec3 v_camera_pos;
 // 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);
+	#ifdef BG_MODE_NONE
 	vec2 o_uv = mod(r_uv, _region_size);
 	ivec2 pos;
 	int bounds, layer_index = -1;
@@ -131,6 +133,11 @@ ivec3 get_index_coord(const vec2 uv, const int search) {
 			layer_index = (_region_map[ pos.y * _region_map_size + pos.x ] * bounds - 1);
 		}
 	}
+	#else
+	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;
+	#endif
 	return ivec3(ivec2(mod(r_uv, _region_size)), layer_index);
 }
 

src/terrain_3d_material.cpp

@@ -139,6 +139,9 @@ 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("NONE_BACKGROUND");
+	}
 	if (_world_background != FLAT) {
 		excludes.push_back("FLAT_UNIFORMS");
 		excludes.push_back("FLAT_FUNCTIONS");