New particle system, mostly working, some small features missing.

1 files changed, 93 insertions, 22 deletions

diff --git a/drivers/gles3/shaders/particles.glsl b/drivers/gles3/shaders/particles.glsl
index e72f12cc5e..347b15d639 100644
--- a/drivers/gles3/shaders/particles.glsl
+++ b/drivers/gles3/shaders/particles.glsl
@@ -22,16 +22,21 @@ struct Attractor {
 
 #define MAX_ATTRACTORS 64
 
-uniform mat4 origin;
+uniform bool emitting;
 uniform float system_phase;
 uniform float prev_system_phase;
-uniform float total_particles;
+uniform int total_particles;
 uniform float explosiveness;
+uniform float randomness;
 uniform vec4 time;
 uniform float delta;
 uniform vec3 gravity;
 uniform int attractor_count;
 uniform Attractor attractors[MAX_ATTRACTORS];
+uniform bool clear;
+uniform uint cycle;
+uniform float lifetime;
+uniform mat4 emission_transform;
 
 
 out highp vec4 out_color; //tfb:
@@ -53,52 +58,116 @@ MATERIAL_UNIFORMS
 
 #endif
 
+uint hash(uint x) {
+
+	x = ((x >> uint(16)) ^ x) * uint(0x45d9f3b);
+	x = ((x >> uint(16)) ^ x) * uint(0x45d9f3b);
+	x = (x >> uint(16)) ^ x;
+	return x;
+}
+
+
 void main() {
 
 	bool apply_forces=true;
 	bool apply_velocity=true;
+	vec3 current_gravity = gravity;
+	float local_delta=delta;
 
 	float mass = 1.0;
 
-	float restart_phase = float(gl_InstanceID)/total_particles;
-	restart_phase*= explosiveness;
+	float restart_phase = float(gl_VertexID)/float(total_particles);
+
+	if (randomness>0.0) {
+		uint seed = cycle;
+		if (restart_phase >= system_phase) {
+			seed-=uint(1);
+		}
+		seed*=uint(total_particles);
+		seed+=uint(gl_VertexID);
+		float random = float(hash(seed) % uint(65536)) / 65536.0;
+		restart_phase+=randomness * random * 1.0 / float(total_particles);
+	}
+
+	restart_phase*= (1.0-explosiveness);
 	bool restart=false;
-	bool active = out_velocity_active.a > 0.5;
+	bool active = velocity_active.a > 0.5;
 
 	if (system_phase > prev_system_phase) {
-		restart = prev_system_phase < restart_phase && system_phase >= restart_phase;
+		if (prev_system_phase < restart_phase && system_phase >= restart_phase) {
+			restart=true;
+#ifdef USE_FRACTIONAL_DELTA
+			local_delta = (system_phase - restart_phase) * lifetime;
+#endif
+		}
+
 	} else {
-		restart = prev_system_phase < restart_phase || system_phase >= restart_phase;
+		if (prev_system_phase < restart_phase) {
+			restart=true;
+#ifdef USE_FRACTIONAL_DELTA
+			local_delta = (1.0 - restart_phase + system_phase) * lifetime;
+#endif
+		} else if (system_phase >= restart_phase) {
+			restart=true;
+#ifdef USE_FRACTIONAL_DELTA
+			local_delta = (system_phase - restart_phase) * lifetime;
+#endif
+		}
 	}
 
-	if (restart) {
-		active=true;
+	uint current_cycle = cycle;
+
+	if (system_phase < restart_phase) {
+		current_cycle-=uint(1);
 	}
 
-	out_color=color;
-	out_velocity_active=velocity_active;
-	out_custom=custom;
+	uint particle_number = current_cycle * uint(total_particles) + uint(gl_VertexID);
 
-	mat4 xform = transpose(mat4(xform_1,xform_2,xform_3,vec4(vec3(0.0),1.0)));
+	if (restart) {
+		active=emitting;
+	}
 
+	mat4 xform;
 
-	out_rot_active=rot_active;
+#if defined(ENABLE_KEEP_DATA)
+	if (clear) {
+#else
+	if (clear || restart) {
+#endif
+		out_color=vec4(1.0);
+		out_velocity_active=vec4(0.0);
+		out_custom=vec4(0.0);
+		if (!restart)
+			active=false;
+
+		xform = mat4(
+				vec4(1.0,0.0,0.0,0.0),
+				vec4(0.0,1.0,0.0,0.0),
+				vec4(0.0,0.0,1.0,0.0),
+				vec4(0.0,0.0,0.0,1.0)
+			);
+	} else {
+		out_color=color;
+		out_velocity_active=velocity_active;
+		out_custom=custom;
+		xform = transpose(mat4(xform_1,xform_2,xform_3,vec4(vec3(0.0),1.0)));
+	}
 
 	if (active) {
 		//execute shader
 
 		{
-			VERTEX_SHADER_CODE
+VERTEX_SHADER_CODE
 		}
 
 #if !defined(DISABLE_FORCE)
 
-		{
+		if (true) {
 
-			vec3 force = gravity;
+			vec3 force = current_gravity;
 			for(int i=0;i<attractor_count;i++) {
 
-				vec3 rel_vec = out_pos_lifetime.xyz - attractors[i].pos;
+				vec3 rel_vec = xform[3].xyz - attractors[i].pos;
 				float dist = rel_vec.length();
 				if (attractors[i].radius < dist)
 					continue;
@@ -119,17 +188,19 @@ void main() {
 				}
 			}
 
-			out_velocity_seed.xyz += force * delta;
+			out_velocity_active.xyz += force * local_delta;
 		}
 #endif
 
 #if !defined(DISABLE_VELOCITY)
 
-		{
+		if (true) {
 
-			out_pos_lifetime.xyz += out_velocity_seed.xyz * delta;
+			xform[3].xyz += out_velocity_active.xyz * local_delta;
 		}
 #endif
+	} else {
+		xform=mat4(0.0);
 	}
 
 	xform = transpose(xform);
@@ -162,6 +233,6 @@ MATERIAL_UNIFORMS
 void main() {
 
 	{
-		FRAGMENT_SHADER_CODE
+FRAGMENT_SHADER_CODE
 	}
 }