begin work on new particle system

1 files changed, 114 insertions, 0 deletions

diff --git a/drivers/gles3/shaders/particles.glsl b/drivers/gles3/shaders/particles.glsl
new file mode 100644
index 0000000000..fb6060957e
--- /dev/null
+++ b/drivers/gles3/shaders/particles.glsl
@@ -0,0 +1,114 @@
+[vertex]
+
+
+
+layout(location=0) in highp vec4 pos_lifetime;
+layout(location=1) in highp vec4 color;
+layout(location=2) in highp vec4 velocity_seed;
+layout(location=3) in highp vec4 rot_active;
+
+
+struct Attractor {
+
+	vec3 pos;
+	vec3 dir;
+	float radius;
+	float eat_radius;
+	float strength;
+	float attenuation;
+};
+
+#define MAX_ATTRACTORS 64
+
+uniform mat4 origin;
+uniform float system_phase;
+uniform float prev_system_phase;
+uniform float total_particles;
+uniform float explosiveness;
+uniform vec4 time;
+uniform float delta;
+uniform vec3 gravity;
+uniform int attractor_count;
+uniform Attractor attractors[MAX_ATTRACTORS];
+
+
+out highp vec4 out_pos_lifetime; //tfb:
+out highp vec4 out_color; //tfb:
+out highp vec4 out_velocity_seed; //tfb:
+out highp vec4 out_rot_active; //tfb:
+
+void main() {
+
+	bool apply_forces=true;
+	bool apply_velocity=true;
+
+	float mass = 1.0;
+
+	float restart_phase = float(gl_InstanceID)/total_particles;
+	restart_phase*= explosiveness;
+	bool restart=false;
+
+	if (system_phase > prev_system_phase) {
+		restart = prev_system_phase < restart_phase && system_phase >= restart_phase;
+	} else {
+		restart = prev_system_phase < restart_phase || system_phase >= restart_phase;
+	}
+
+	if (restart) {
+		out_rot_active.a=1.0;
+	}
+
+	out_pos_lifetime=pos_lifetime;
+	out_color=color;
+	out_velocity_seed=velocity_seed;
+	out_rot_active=rot_active;
+
+	if (out_rot_active.a) {
+		//execute shader
+
+	}
+
+
+	if (apply_forces) {
+
+		vec3 force = gravity;
+		for(int i=0;i<attractor_count;i++) {
+
+			vec3 rel_vec = out_pos_lifetime.xyz - attractors[i].pos;
+			float dist = rel_vec.length();
+			if (attractors[i].radius < dist)
+				continue;
+			if (attractors[i].eat_radius>0 &&  attractors[i].eat_radius > dist) {
+				rot_active.a=0.0;
+			}
+
+			rel_vec = normalize(rel_vec);
+
+			float attenuation = pow(dist / attractors[i].radius,attractors[i].attenuation);
+
+			if (attractors[i].dir==vec3(0.0)) {
+				//towards center
+				force+=attractors[i].strength * rel_vec * attenuation * mass;
+			} else {
+				force+=attractors[i].strength * attractors[i].dir * attenuation *mass;
+
+			}
+		}
+
+		out_velocity_seed.xyz += force * delta;
+	}
+
+	if (apply_velocity) {
+
+		out_pos_lifetime.xyz += out_velocity_seed.xyz * delta;
+	}
+
+}
+
+[fragment]
+
+
+void main() {
+
+
+}