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Shaders/tree_leaves.gdshader

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+shader_type spatial;
+
+// Rimosso 'unshaded' per ricevere le ombre.
+// Aggiunto 'ambient_light_disabled' per proteggere i tuoi colori piatti.
+render_mode specular_disabled, cull_disabled, ambient_light_disabled;
+
+// --- GLOBAL UNIFORMS (Vento) ---
+global uniform float wind_scale;
+global uniform float wind_speed;
+global uniform float wind_strength;
+global uniform vec3 wind_direction;
+global uniform sampler2D wind_noise : filter_linear_mipmap;
+
+// --- PARAMETRI ESTETICI ---
+uniform bool billboard_enabled = true; // <--- PULSANTE ON/OFF BILLBOARD
+uniform bool wind_enabled = true;      // <--- PULSANTE ON/OFF VENTO
+uniform vec4 base_color : source_color = vec4(0.2, 0.6, 0.3, 1.0);
+uniform sampler2D alpha_texture : source_color, filter_nearest;
+uniform float leaves_scale = 1.0;
+uniform float rotation_degrees = 0.0;
+uniform vec2 texture_offset = vec2(0.0, 0.0);
+uniform float opacity : hint_range(0.0, 1.0) = 1.0; // <--- NUOVO PARAMETRO OPACITÀ
+
+// --- CONTROLLO GRADIENTE E RANDOM ---
+uniform float height_min = 0.0;
+uniform float height_max = 5.0;
+uniform float shadow_intensity : hint_range(0.0, 1.0) = 0.5;
+uniform float highlight_intensity : hint_range(0.0, 1.0) = 0.3;
+uniform float light_steps : hint_range(1.0, 10.0) = 4.0;
+uniform float random_mix : hint_range(0.0, 1.0) = 0.3;
+
+// NUOVO PARAMETRO: Intensità delle ombre proiettate su questo materiale
+uniform float cast_shadow_strength : hint_range(0.0, 1.0) = 0.6;
+
+varying vec3 v_final_color;
+
+float hash(vec3 p) {
+	p = fract(p * 0.1031);
+	p += dot(p, p.yzx + 33.33);
+	return fract((p.x + p.y) * p.z);
+}
+
+void vertex() {
+	vec3 instance_pos = MODEL_MATRIX[3].xyz;
+	
+	// --- LOGICA VENTO ---
+	float total_angle = radians(rotation_degrees);
+	if (wind_enabled) {
+		float time = TIME * wind_speed;
+		vec2 noise_uv = (instance_pos.xz * wind_scale) + (time * wind_direction.xz * 0.5);
+		float noise_val = textureLod(wind_noise, noise_uv, 2.0).r;
+		float sway = sin(time + (noise_val * 10.0));
+		total_angle += (sway * wind_strength);
+	}
+
+	// --- CALCOLO COLORE ---
+	float h_factor = clamp((instance_pos.y - height_min) / (height_max - height_min), 0.0, 1.0);
+	float leaf_rand = hash(instance_pos);
+	float combined_factor = mix(h_factor, leaf_rand, random_mix);
+	combined_factor = ceil(combined_factor * light_steps) / light_steps;
+	
+	vec3 dark_color = base_color.rgb * (1.0 - shadow_intensity);
+	vec3 light_color = base_color.rgb + (vec3(1.0) - base_color.rgb) * highlight_intensity;
+	v_final_color = mix(dark_color, light_color, combined_factor);
+
+	// --- LOGICA TRASFORMAZIONE (BILLBOARD vs STANDARD) ---
+	if (billboard_enabled) {
+		// Logica Billboard: guarda sempre la camera
+		vec3 view_pos_origin = (VIEW_MATRIX * vec4(instance_pos, 1.0)).xyz;
+		vec2 offset = (UV - 0.5) * leaves_scale;
+
+		float c = cos(total_angle);
+		float s = sin(total_angle);
+		vec2 rotated_offset = vec2(offset.x * c - offset.y * s, offset.x * s + offset.y * c);
+		
+		vec3 final_pos = view_pos_origin + vec3(rotated_offset.x, rotated_offset.y, 0.0);
+
+		MODELVIEW_MATRIX = mat4(1.0);
+		MODELVIEW_MATRIX[3].xyz = final_pos;
+		VERTEX = vec3(0.0);
+	} else {
+		// Logica Standard: usa la rotazione e posizione della mesh
+		// Applichiamo comunque la rotazione extra e lo scale se desiderato
+		float c = cos(total_angle);
+		float s = sin(total_angle);
+		
+		// Modifichiamo il vertice locale prima della trasformazione world
+		vec2 local_v = (VERTEX.xy) * leaves_scale;
+		VERTEX.x = local_v.x * c - local_v.y * s;
+		VERTEX.y = local_v.x * s + local_v.y * c;
+		// La MODELVIEW_MATRIX rimane quella di default fornita da Godot
+	}
+}
+
+void fragment() {
+	vec2 shifted_uv = UV + texture_offset;
+	vec4 tex = texture(alpha_texture, shifted_uv);
+	
+	ALBEDO = v_final_color;
+	// Moltiplichiamo l'alpha della texture per il nuovo parametro opacity
+	ALPHA = tex.r * opacity; 
+	ALPHA_SCISSOR_THRESHOLD = 0.5;
+}
+
+// --- NUOVA LOGICA LUCE (Ombre Proiettate e Fix Quadrati) ---
+void light() {
+	float shadow_factor = mix(1.0 - cast_shadow_strength, 1.0, ATTENUATION);
+	
+	// Maschera morbida per nascondere i quadrati
+	float cutoff_mask = smoothstep(0.0, 0.05, ATTENUATION);
+	
+	DIFFUSE_LIGHT += (shadow_factor * LIGHT_COLOR) * cutoff_mask;
+}