1 files changed, 260 insertions, 0 deletions
diff --git a/drivers/gles2/shaders/particles.glsl b/drivers/gles2/shaders/particles.glsl
new file mode 100644
index 0000000000..a62c124dfe
--- /dev/null
+++ b/drivers/gles2/shaders/particles.glsl
@@ -0,0 +1,260 @@
+[vertex]
+
+
+
+layout(location=0) in highp vec4 color;
+layout(location=1) in highp vec4 velocity_active;
+layout(location=2) in highp vec4 custom;
+layout(location=3) in highp vec4 xform_1;
+layout(location=4) in highp vec4 xform_2;
+layout(location=5) in highp vec4 xform_3;
+
+
+struct Attractor {
+
+	vec3 pos;
+	vec3 dir;
+	float radius;
+	float eat_radius;
+	float strength;
+	float attenuation;
+};
+
+#define MAX_ATTRACTORS 64
+
+uniform bool emitting;
+uniform float system_phase;
+uniform float prev_system_phase;
+uniform int total_particles;
+uniform float explosiveness;
+uniform float randomness;
+uniform float time;
+uniform float delta;
+
+uniform int attractor_count;
+uniform Attractor attractors[MAX_ATTRACTORS];
+uniform bool clear;
+uniform uint cycle;
+uniform float lifetime;
+uniform mat4 emission_transform;
+uniform uint random_seed;
+
+
+out highp vec4 out_color; //tfb:
+out highp vec4 out_velocity_active; //tfb:
+out highp vec4 out_custom; //tfb:
+out highp vec4 out_xform_1; //tfb:
+out highp vec4 out_xform_2; //tfb:
+out highp vec4 out_xform_3; //tfb:
+
+
+#if defined(USE_MATERIAL)
+
+layout(std140) uniform UniformData { //ubo:0
+
+MATERIAL_UNIFORMS
+
+};
+
+#endif
+
+
+VERTEX_SHADER_GLOBALS
+
+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() {
+
+#ifdef PARTICLES_COPY
+
+	out_color=color;
+	out_velocity_active=velocity_active;
+	out_custom = custom;
+	out_xform_1 = xform_1;
+	out_xform_2 = xform_2;
+	out_xform_3 = xform_3;
+
+#else
+
+	bool apply_forces=true;
+	bool apply_velocity=true;
+	float local_delta=delta;
+
+	float mass = 1.0;
+
+	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 shader_active = velocity_active.a > 0.5;
+
+	if (system_phase > prev_system_phase) {
+		// restart_phase >= prev_system_phase is used so particles emit in the first frame they are processed
+
+		if (restart_phase >= prev_system_phase && restart_phase < system_phase ) {
+			restart=true;
+#ifdef USE_FRACTIONAL_DELTA
+			local_delta = (system_phase - restart_phase) * lifetime;
+#endif
+		}
+
+	} else {
+		if (restart_phase >= prev_system_phase) {
+			restart=true;
+#ifdef USE_FRACTIONAL_DELTA
+			local_delta = (1.0 - restart_phase + system_phase) * lifetime;
+#endif
+		} else if (restart_phase < system_phase ) {
+			restart=true;
+#ifdef USE_FRACTIONAL_DELTA
+			local_delta = (system_phase - restart_phase) * lifetime;
+#endif
+		}
+	}
+
+	uint current_cycle = cycle;
+
+	if (system_phase < restart_phase) {
+		current_cycle-=uint(1);
+	}
+
+	uint particle_number = current_cycle * uint(total_particles) + uint(gl_VertexID);
+	int index = int(gl_VertexID);
+
+	if (restart) {
+		shader_active=emitting;
+	}
+
+	mat4 xform;
+
+#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)
+			shader_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 (shader_active) {
+		//execute shader
+
+		{
+VERTEX_SHADER_CODE
+		}
+
+#if !defined(DISABLE_FORCE)
+
+		if (false) {
+
+			vec3 force = vec3(0.0);
+			for(int i=0;i<attractor_count;i++) {
+
+				vec3 rel_vec = xform[3].xyz - attractors[i].pos;
+				float dist = length(rel_vec);
+				if (attractors[i].radius < dist)
+					continue;
+				if (attractors[i].eat_radius>0.0 &&  attractors[i].eat_radius > dist) {
+					out_velocity_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_active.xyz += force * local_delta;
+		}
+#endif
+
+#if !defined(DISABLE_VELOCITY)
+
+		if (true) {
+
+			xform[3].xyz += out_velocity_active.xyz * local_delta;
+		}
+#endif
+	} else {
+		xform=mat4(0.0);
+	}
+
+	xform = transpose(xform);
+
+	out_velocity_active.a = mix(0.0,1.0,shader_active);
+
+	out_xform_1 = xform[0];
+	out_xform_2 = xform[1];
+	out_xform_3 = xform[2];
+
+#endif //PARTICLES_COPY
+
+}
+
+[fragment]
+
+//any code here is never executed, stuff is filled just so it works
+
+
+#if defined(USE_MATERIAL)
+
+layout(std140) uniform UniformData {
+
+MATERIAL_UNIFORMS
+
+};
+
+#endif
+
+FRAGMENT_SHADER_GLOBALS
+
+void main() {
+
+	{
+LIGHT_SHADER_CODE
+	}
+
+	{
+FRAGMENT_SHADER_CODE
+	}
+}