init

Shaders/spotlight.gdshader

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+shader_type spatial;
+render_mode blend_add, cull_disabled, unshaded;
+
+uniform sampler2D dust : source_color;
+uniform float dust_speed = 0.03;
+uniform vec4 color : source_color;
+uniform float intensity = 2.75;
+uniform float softness = 3.0;
+
+// Godot 4 explicit texture hints
+uniform sampler2D depth_texture : hint_depth_texture, filter_linear_mipmap;
+uniform sampler2D screen_texture : hint_screen_texture, filter_linear_mipmap;
+
+uniform float proximity_fade_distance = 0.5;
+uniform float distance_fade_min = 1.0;
+uniform float distance_fade_max = 2.0;
+
+varying vec3 obj_vertex;
+
+void vertex() {
+	obj_vertex = VERTEX;
+}
+
+void fragment() {
+	// Dust texture sampling using screen coordinates
+	vec2 dust_uv = vec2(SCREEN_UV.x + dust_speed * TIME, SCREEN_UV.y);
+	vec4 dust_overlay = texture(dust, dust_uv);
+	
+	float attenuation = clamp(1.0 + obj_vertex.y / intensity, 0.0, 1.0);
+	float soft_edge = clamp(pow(dot(NORMAL, normalize(VERTEX)), softness), 0.0, 1.0);
+	
+	ALBEDO = dust_overlay.rgb * color.rgb * attenuation * soft_edge;
+	
+	// Proximity Fade calculation in Godot 4
+	float depth_raw = texture(depth_texture, SCREEN_UV).r;
+	vec4 ndc = vec4(SCREEN_UV * 2.0 - 1.0, depth_raw, 1.0);
+	vec4 view_pos = INV_PROJECTION_MATRIX * ndc;
+	view_pos.xyz /= view_pos.w;
+	
+	float depth_diff = -VERTEX.z - (-view_pos.z);
+	float proximity_alpha = clamp(depth_diff / proximity_fade_distance, 0.0, 1.0);
+	
+	// Distance Fade calculation
+	float dist_alpha = clamp(smoothstep(distance_fade_min, distance_fade_max, -VERTEX.z), 0.0, 1.0);
+	
+	ALPHA = proximity_alpha * dist_alpha;
+}