save code

2025-11-28 18:10:23 +08:00
commit fee064c3f0
49 changed files with 64353 additions and 0 deletions
@@ -0,0 +1,43 @@
+shader_type particles;
+
+render_mode keep_data,disable_force,disable_velocity;
+
+
+
+void process() {
+	// CUSTOM.w tracks the particles place in the trail, in range (0..LIFETIME]
+	// requires that LIFETIME = number of particles
+	float amount = LIFETIME;
+	
+	vec4 a = EMISSION_TRANSFORM * vec4(0,1,0,1);
+	vec4 b = EMISSION_TRANSFORM * vec4(0,-1,0,1);
+	
+	// start
+	if(CUSTOM.w == 0.0){
+		CUSTOM.w = float(INDEX)+1.0;
+		
+		// needed to pass to draw pass
+		CUSTOM.z = amount;
+		
+		// needed to initialize in case of CUSTOM.w == 2.0
+		TRANSFORM = mat4(a,a,b,b);
+	}
+	
+	// restart
+	if(CUSTOM.w == amount+1.0){
+		CUSTOM.w = 1.0;
+	}
+	
+	if(CUSTOM.w == 1.0){
+		// sets the quad to the line to cache this frame, it is not yet visible
+		TRANSFORM = mat4(a,a,b,b);
+	}
+	
+	if(CUSTOM.w == 2.0){
+		// sets the right edge of the quad
+		TRANSFORM[1] = a;
+		TRANSFORM[2] = b;
+	}
+
+	CUSTOM.w++;
+}