Move ParticlesMaterial code to its own resource file

It's shared by both 2D and 3D particles (+ CPU ones), so it makes sense
to have as a common resource. It also allowed to disable compilation of
Particles (3D) when using 'disable_3d'.

Also cleaned up includes in SpatialEditorGizmos and some other places,
as well as dropped dead code in material_editor_plugin.cpp.

2 files changed, 1547 insertions, 0 deletions

diff --git a/scene/resources/particles_material.cpp b/scene/resources/particles_material.cpp
new file mode 100644
index 0000000000..14bc4f71c2
--- /dev/null
+++ b/scene/resources/particles_material.cpp
@@ -0,0 +1,1245 @@
+/*************************************************************************/
+/*  particles_material.cpp                                               */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md)    */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#include "particles_material.h"
+
+Mutex *ParticlesMaterial::material_mutex = NULL;
+SelfList<ParticlesMaterial>::List ParticlesMaterial::dirty_materials;
+Map<ParticlesMaterial::MaterialKey, ParticlesMaterial::ShaderData> ParticlesMaterial::shader_map;
+ParticlesMaterial::ShaderNames *ParticlesMaterial::shader_names = NULL;
+
+void ParticlesMaterial::init_shaders() {
+
+#ifndef NO_THREADS
+	material_mutex = Mutex::create();
+#endif
+
+	shader_names = memnew(ShaderNames);
+
+	shader_names->spread = "spread";
+	shader_names->flatness = "flatness";
+	shader_names->initial_linear_velocity = "initial_linear_velocity";
+	shader_names->initial_angle = "initial_angle";
+	shader_names->angular_velocity = "angular_velocity";
+	shader_names->orbit_velocity = "orbit_velocity";
+	shader_names->linear_accel = "linear_accel";
+	shader_names->radial_accel = "radial_accel";
+	shader_names->tangent_accel = "tangent_accel";
+	shader_names->damping = "damping";
+	shader_names->scale = "scale";
+	shader_names->hue_variation = "hue_variation";
+	shader_names->anim_speed = "anim_speed";
+	shader_names->anim_offset = "anim_offset";
+
+	shader_names->initial_linear_velocity_random = "initial_linear_velocity_random";
+	shader_names->initial_angle_random = "initial_angle_random";
+	shader_names->angular_velocity_random = "angular_velocity_random";
+	shader_names->orbit_velocity_random = "orbit_velocity_random";
+	shader_names->linear_accel_random = "linear_accel_random";
+	shader_names->radial_accel_random = "radial_accel_random";
+	shader_names->tangent_accel_random = "tangent_accel_random";
+	shader_names->damping_random = "damping_random";
+	shader_names->scale_random = "scale_random";
+	shader_names->hue_variation_random = "hue_variation_random";
+	shader_names->anim_speed_random = "anim_speed_random";
+	shader_names->anim_offset_random = "anim_offset_random";
+
+	shader_names->angle_texture = "angle_texture";
+	shader_names->angular_velocity_texture = "angular_velocity_texture";
+	shader_names->orbit_velocity_texture = "orbit_velocity_texture";
+	shader_names->linear_accel_texture = "linear_accel_texture";
+	shader_names->radial_accel_texture = "radial_accel_texture";
+	shader_names->tangent_accel_texture = "tangent_accel_texture";
+	shader_names->damping_texture = "damping_texture";
+	shader_names->scale_texture = "scale_texture";
+	shader_names->hue_variation_texture = "hue_variation_texture";
+	shader_names->anim_speed_texture = "anim_speed_texture";
+	shader_names->anim_offset_texture = "anim_offset_texture";
+
+	shader_names->color = "color_value";
+	shader_names->color_ramp = "color_ramp";
+
+	shader_names->emission_sphere_radius = "emission_sphere_radius";
+	shader_names->emission_box_extents = "emission_box_extents";
+	shader_names->emission_texture_point_count = "emission_texture_point_count";
+	shader_names->emission_texture_points = "emission_texture_points";
+	shader_names->emission_texture_normal = "emission_texture_normal";
+	shader_names->emission_texture_color = "emission_texture_color";
+
+	shader_names->trail_divisor = "trail_divisor";
+	shader_names->trail_size_modifier = "trail_size_modifier";
+	shader_names->trail_color_modifier = "trail_color_modifier";
+
+	shader_names->gravity = "gravity";
+}
+
+void ParticlesMaterial::finish_shaders() {
+
+#ifndef NO_THREADS
+	memdelete(material_mutex);
+#endif
+
+	memdelete(shader_names);
+}
+
+void ParticlesMaterial::_update_shader() {
+
+	dirty_materials.remove(&element);
+
+	MaterialKey mk = _compute_key();
+	if (mk.key == current_key.key)
+		return; //no update required in the end
+
+	if (shader_map.has(current_key)) {
+		shader_map[current_key].users--;
+		if (shader_map[current_key].users == 0) {
+			//deallocate shader, as it's no longer in use
+			VS::get_singleton()->free(shader_map[current_key].shader);
+			shader_map.erase(current_key);
+		}
+	}
+
+	current_key = mk;
+
+	if (shader_map.has(mk)) {
+
+		VS::get_singleton()->material_set_shader(_get_material(), shader_map[mk].shader);
+		shader_map[mk].users++;
+		return;
+	}
+
+	//must create a shader!
+
+	String code = "shader_type particles;\n";
+
+	code += "uniform float spread;\n";
+	code += "uniform float flatness;\n";
+	code += "uniform float initial_linear_velocity;\n";
+	code += "uniform float initial_angle;\n";
+	code += "uniform float angular_velocity;\n";
+	code += "uniform float orbit_velocity;\n";
+	code += "uniform float linear_accel;\n";
+	code += "uniform float radial_accel;\n";
+	code += "uniform float tangent_accel;\n";
+	code += "uniform float damping;\n";
+	code += "uniform float scale;\n";
+	code += "uniform float hue_variation;\n";
+	code += "uniform float anim_speed;\n";
+	code += "uniform float anim_offset;\n";
+
+	code += "uniform float initial_linear_velocity_random;\n";
+	code += "uniform float initial_angle_random;\n";
+	code += "uniform float angular_velocity_random;\n";
+	code += "uniform float orbit_velocity_random;\n";
+	code += "uniform float linear_accel_random;\n";
+	code += "uniform float radial_accel_random;\n";
+	code += "uniform float tangent_accel_random;\n";
+	code += "uniform float damping_random;\n";
+	code += "uniform float scale_random;\n";
+	code += "uniform float hue_variation_random;\n";
+	code += "uniform float anim_speed_random;\n";
+	code += "uniform float anim_offset_random;\n";
+
+	switch (emission_shape) {
+		case EMISSION_SHAPE_POINT: {
+			//do none
+		} break;
+		case EMISSION_SHAPE_SPHERE: {
+			code += "uniform float emission_sphere_radius;\n";
+		} break;
+		case EMISSION_SHAPE_BOX: {
+			code += "uniform vec3 emission_box_extents;\n";
+		} break;
+		case EMISSION_SHAPE_DIRECTED_POINTS: {
+			code += "uniform sampler2D emission_texture_normal : hint_black;\n";
+		} //fallthrough
+		case EMISSION_SHAPE_POINTS: {
+			code += "uniform sampler2D emission_texture_points : hint_black;\n";
+			code += "uniform int emission_texture_point_count;\n";
+			if (emission_color_texture.is_valid()) {
+				code += "uniform sampler2D emission_texture_color : hint_white;\n";
+			}
+		} break;
+	}
+
+	code += "uniform vec4 color_value : hint_color;\n";
+
+	code += "uniform int trail_divisor;\n";
+
+	code += "uniform vec3 gravity;\n";
+
+	if (color_ramp.is_valid())
+		code += "uniform sampler2D color_ramp;\n";
+
+	if (tex_parameters[PARAM_INITIAL_LINEAR_VELOCITY].is_valid())
+		code += "uniform sampler2D linear_velocity_texture;\n";
+	if (tex_parameters[PARAM_ORBIT_VELOCITY].is_valid())
+		code += "uniform sampler2D orbit_velocity_texture;\n";
+	if (tex_parameters[PARAM_ANGULAR_VELOCITY].is_valid())
+		code += "uniform sampler2D angular_velocity_texture;\n";
+	if (tex_parameters[PARAM_LINEAR_ACCEL].is_valid())
+		code += "uniform sampler2D linear_accel_texture;\n";
+	if (tex_parameters[PARAM_RADIAL_ACCEL].is_valid())
+		code += "uniform sampler2D radial_accel_texture;\n";
+	if (tex_parameters[PARAM_TANGENTIAL_ACCEL].is_valid())
+		code += "uniform sampler2D tangent_accel_texture;\n";
+	if (tex_parameters[PARAM_DAMPING].is_valid())
+		code += "uniform sampler2D damping_texture;\n";
+	if (tex_parameters[PARAM_ANGLE].is_valid())
+		code += "uniform sampler2D angle_texture;\n";
+	if (tex_parameters[PARAM_SCALE].is_valid())
+		code += "uniform sampler2D scale_texture;\n";
+	if (tex_parameters[PARAM_HUE_VARIATION].is_valid())
+		code += "uniform sampler2D hue_variation_texture;\n";
+	if (tex_parameters[PARAM_ANIM_SPEED].is_valid())
+		code += "uniform sampler2D anim_speed_texture;\n";
+	if (tex_parameters[PARAM_ANIM_OFFSET].is_valid())
+		code += "uniform sampler2D anim_offset_texture;\n";
+
+	if (trail_size_modifier.is_valid()) {
+		code += "uniform sampler2D trail_size_modifier;\n";
+	}
+
+	if (trail_color_modifier.is_valid()) {
+		code += "uniform sampler2D trail_color_modifier;\n";
+	}
+
+	//need a random function
+	code += "\n\n";
+	code += "float rand_from_seed(inout uint seed) {\n";
+	code += "	int k;\n";
+	code += "	int s = int(seed);\n";
+	code += "	if (s == 0)\n";
+	code += "	s = 305420679;\n";
+	code += "	k = s / 127773;\n";
+	code += "	s = 16807 * (s - k * 127773) - 2836 * k;\n";
+	code += "	if (s < 0)\n";
+	code += "		s += 2147483647;\n";
+	code += "	seed = uint(s);\n";
+	code += "	return float(seed % uint(65536))/65535.0;\n";
+	code += "}\n";
+	code += "\n";
+
+	code += "float rand_from_seed_m1_p1(inout uint seed) {\n";
+	code += "	return rand_from_seed(seed)*2.0-1.0;\n";
+	code += "}\n";
+	code += "\n";
+
+	//improve seed quality
+	code += "uint hash(uint x) {\n";
+	code += "	x = ((x >> uint(16)) ^ x) * uint(73244475);\n";
+	code += "	x = ((x >> uint(16)) ^ x) * uint(73244475);\n";
+	code += "	x = (x >> uint(16)) ^ x;\n";
+	code += "	return x;\n";
+	code += "}\n";
+	code += "\n";
+
+	code += "void vertex() {\n";
+	code += "	uint base_number = NUMBER/uint(trail_divisor);\n";
+	code += "	uint alt_seed = hash(base_number+uint(1)+RANDOM_SEED);\n";
+	code += "	float angle_rand = rand_from_seed(alt_seed);\n";
+	code += "	float scale_rand = rand_from_seed(alt_seed);\n";
+	code += "	float hue_rot_rand = rand_from_seed(alt_seed);\n";
+	code += "	float anim_offset_rand = rand_from_seed(alt_seed);\n";
+	code += "	float pi = 3.14159;\n";
+	code += "	float degree_to_rad = pi / 180.0;\n";
+	code += "\n";
+
+	if (emission_shape >= EMISSION_SHAPE_POINTS) {
+		code += "	int point = min(emission_texture_point_count-1,int(rand_from_seed(alt_seed) * float(emission_texture_point_count)));\n";
+		code += "	ivec2 emission_tex_size = textureSize( emission_texture_points, 0 );\n";
+		code += "	ivec2 emission_tex_ofs = ivec2( point % emission_tex_size.x, point / emission_tex_size.x );\n";
+	}
+	code += "	if (RESTART) {\n";
+
+	if (tex_parameters[PARAM_INITIAL_LINEAR_VELOCITY].is_valid())
+		code += "		float tex_linear_velocity = textureLod(linear_velocity_texture,vec2(0.0,0.0),0.0).r;\n";
+	else
+		code += "		float tex_linear_velocity = 0.0;\n";
+
+	if (tex_parameters[PARAM_ANGLE].is_valid())
+		code += "		float tex_angle = textureLod(angle_texture,vec2(0.0,0.0),0.0).r;\n";
+	else
+		code += "		float tex_angle = 0.0;\n";
+
+	if (tex_parameters[PARAM_ANIM_OFFSET].is_valid())
+		code += "		float tex_anim_offset = textureLod(anim_offset_texture,vec2(0.0,0.0),0.0).r;\n";
+	else
+		code += "		float tex_anim_offset = 0.0;\n";
+
+	code += "		float spread_rad = spread*degree_to_rad;\n";
+
+	if (flags[FLAG_DISABLE_Z]) {
+
+		code += "		float angle1_rad = rand_from_seed_m1_p1(alt_seed)*spread_rad;\n";
+		code += "		vec3 rot = vec3( cos(angle1_rad), sin(angle1_rad),0.0 );\n";
+		code += "		VELOCITY = rot*initial_linear_velocity*mix(1.0, rand_from_seed(alt_seed), initial_linear_velocity_random);\n";
+
+	} else {
+		//initiate velocity spread in 3D
+		code += "		float angle1_rad = rand_from_seed_m1_p1(alt_seed)*spread_rad;\n";
+		code += "		float angle2_rad = rand_from_seed_m1_p1(alt_seed)*spread_rad*(1.0-flatness);\n";
+		code += "		vec3 direction_xz = vec3( sin(angle1_rad), 0, cos(angle1_rad));\n";
+		code += "		vec3 direction_yz = vec3( 0, sin(angle2_rad), cos(angle2_rad));\n";
+		code += "		direction_yz.z = direction_yz.z / sqrt(direction_yz.z); //better uniform distribution\n";
+		code += "		vec3 direction = vec3(direction_xz.x * direction_yz.z, direction_yz.y, direction_xz.z * direction_yz.z);\n";
+		code += "		direction = normalize(direction);\n";
+		code += "		VELOCITY = direction*initial_linear_velocity*mix(1.0, rand_from_seed(alt_seed), initial_linear_velocity_random);\n";
+	}
+
+	code += "		float base_angle = (initial_angle+tex_angle)*mix(1.0,angle_rand,initial_angle_random);\n";
+	code += "		CUSTOM.x = base_angle*degree_to_rad;\n"; //angle
+	code += "		CUSTOM.y = 0.0;\n"; //phase
+	code += "		CUSTOM.z = (anim_offset+tex_anim_offset)*mix(1.0,anim_offset_rand,anim_offset_random);\n"; //animation offset (0-1)
+	switch (emission_shape) {
+		case EMISSION_SHAPE_POINT: {
+			//do none
+		} break;
+		case EMISSION_SHAPE_SPHERE: {
+			code += "		TRANSFORM[3].xyz = normalize(vec3(rand_from_seed(alt_seed) * 2.0 - 1.0, rand_from_seed(alt_seed) * 2.0-1.0, rand_from_seed(alt_seed) * 2.0-1.0 ))*emission_sphere_radius;\n";
+		} break;
+		case EMISSION_SHAPE_BOX: {
+			code += "		TRANSFORM[3].xyz = vec3(rand_from_seed(alt_seed) * 2.0 - 1.0, rand_from_seed(alt_seed) * 2.0-1.0, rand_from_seed(alt_seed) * 2.0-1.0)*emission_box_extents;\n";
+		} break;
+		case EMISSION_SHAPE_POINTS:
+		case EMISSION_SHAPE_DIRECTED_POINTS: {
+			code += "		TRANSFORM[3].xyz = texelFetch(emission_texture_points, emission_tex_ofs,0).xyz;\n";
+
+			if (emission_shape == EMISSION_SHAPE_DIRECTED_POINTS) {
+				if (flags[FLAG_DISABLE_Z]) {
+
+					code += "		mat2 rotm;";
+					code += "		rotm[0] = texelFetch(emission_texture_normal, emission_tex_ofs,0).xy;\n";
+					code += "		rotm[1] = rotm[0].yx * vec2(1.0,-1.0);\n";
+					code += "		VELOCITY.xy = rotm * VELOCITY.xy;\n";
+				} else {
+					code += "		vec3 normal = texelFetch(emission_texture_normal, emission_tex_ofs,0).xyz;\n";
+					code += "		vec3 v0 = abs(normal.z) < 0.999 ? vec3(0.0, 0.0, 1.0) : vec3(0, 1.0, 0.0);\n";
+					code += "		vec3 tangent = normalize(cross(v0, normal));\n";
+					code += "		vec3 bitangent = normalize(cross(tangent, normal));\n";
+					code += "		VELOCITY = mat3(tangent,bitangent,normal) * VELOCITY;\n";
+				}
+			}
+		} break;
+	}
+	code += "		VELOCITY = (EMISSION_TRANSFORM * vec4(VELOCITY,0.0)).xyz;\n";
+	code += "		TRANSFORM = EMISSION_TRANSFORM * TRANSFORM;\n";
+	if (flags[FLAG_DISABLE_Z]) {
+		code += "		VELOCITY.z = 0.0;\n";
+		code += "		TRANSFORM[3].z = 0.0;\n";
+	}
+
+	code += "	} else {\n";
+
+	code += "		CUSTOM.y += DELTA/LIFETIME;\n";
+	if (tex_parameters[PARAM_INITIAL_LINEAR_VELOCITY].is_valid())
+		code += "		float tex_linear_velocity = textureLod(linear_velocity_texture,vec2(CUSTOM.y,0.0),0.0).r;\n";
+	else
+		code += "		float tex_linear_velocity = 0.0;\n";
+
+	if (flags[FLAG_DISABLE_Z]) {
+
+		if (tex_parameters[PARAM_ORBIT_VELOCITY].is_valid())
+			code += "		float tex_orbit_velocity = textureLod(orbit_velocity_texture,vec2(CUSTOM.y,0.0),0.0).r;\n";
+		else
+			code += "		float tex_orbit_velocity = 0.0;\n";
+	}
+
+	if (tex_parameters[PARAM_ANGULAR_VELOCITY].is_valid())
+		code += "		float tex_angular_velocity = textureLod(angular_velocity_texture,vec2(CUSTOM.y,0.0),0.0).r;\n";
+	else
+		code += "		float tex_angular_velocity = 0.0;\n";
+
+	if (tex_parameters[PARAM_LINEAR_ACCEL].is_valid())
+		code += "		float tex_linear_accel = textureLod(linear_accel_texture,vec2(CUSTOM.y,0.0),0.0).r;\n";
+	else
+		code += "		float tex_linear_accel = 0.0;\n";
+
+	if (tex_parameters[PARAM_RADIAL_ACCEL].is_valid())
+		code += "		float tex_radial_accel = textureLod(radial_accel_texture,vec2(CUSTOM.y,0.0),0.0).r;\n";
+	else
+		code += "		float tex_radial_accel = 0.0;\n";
+
+	if (tex_parameters[PARAM_TANGENTIAL_ACCEL].is_valid())
+		code += "		float tex_tangent_accel = textureLod(tangent_accel_texture,vec2(CUSTOM.y,0.0),0.0).r;\n";
+	else
+		code += "		float tex_tangent_accel = 0.0;\n";
+
+	if (tex_parameters[PARAM_DAMPING].is_valid())
+		code += "		float tex_damping = textureLod(damping_texture,vec2(CUSTOM.y,0.0),0.0).r;\n";
+	else
+		code += "		float tex_damping = 0.0;\n";
+
+	if (tex_parameters[PARAM_ANGLE].is_valid())
+		code += "		float tex_angle = textureLod(angle_texture,vec2(CUSTOM.y,0.0),0.0).r;\n";
+	else
+		code += "		float tex_angle = 0.0;\n";
+
+	if (tex_parameters[PARAM_ANIM_SPEED].is_valid())
+		code += "		float tex_anim_speed = textureLod(anim_speed_texture,vec2(CUSTOM.y,0.0),0.0).r;\n";
+	else
+		code += "		float tex_anim_speed = 0.0;\n";
+
+	if (tex_parameters[PARAM_ANIM_OFFSET].is_valid())
+		code += "		float tex_anim_offset = textureLod(anim_offset_texture,vec2(CUSTOM.y,0.0),0.0).r;\n";
+	else
+		code += "		float tex_anim_offset = 0.0;\n";
+
+	code += "		vec3 force = gravity; \n";
+	code += "		vec3 pos = TRANSFORM[3].xyz; \n";
+	if (flags[FLAG_DISABLE_Z]) {
+		code += "		pos.z = 0.0; \n";
+	}
+	code += "		//apply linear acceleration\n";
+	code += "		force += length(VELOCITY) > 0.0 ? normalize(VELOCITY) * (linear_accel+tex_linear_accel)*mix(1.0,rand_from_seed(alt_seed),linear_accel_random) : vec3(0.0);\n";
+	code += "		//apply radial acceleration\n";
+	code += "		vec3 org = EMISSION_TRANSFORM[3].xyz;\n";
+	code += "		vec3 diff = pos-org;\n";
+	code += "		force += length(diff) > 0.0 ? normalize(diff) * (radial_accel+tex_radial_accel)*mix(1.0,rand_from_seed(alt_seed),radial_accel_random) : vec3(0.0);\n";
+	code += "		//apply tangential acceleration;\n";
+	if (flags[FLAG_DISABLE_Z]) {
+		code += "		force += length(diff.yx) > 0.0 ? vec3(normalize(diff.yx * vec2(-1.0,1.0)),0.0) * ((tangent_accel+tex_tangent_accel)*mix(1.0,rand_from_seed(alt_seed),tangent_accel_random)) : vec3(0.0);\n";
+
+	} else {
+		code += "		vec3 crossDiff = cross(normalize(diff),normalize(gravity));\n";
+		code += "		force += length(crossDiff) > 0.0 ? normalize(crossDiff) * ((tangent_accel+tex_tangent_accel)*mix(1.0,rand_from_seed(alt_seed),tangent_accel_random)) : vec3(0.0);\n";
+	}
+	code += "		//apply attractor forces\n";
+	code += "		VELOCITY += force * DELTA;\n";
+	code += "		//orbit velocity\n";
+	if (flags[FLAG_DISABLE_Z]) {
+
+		code += "		float orbit_amount = (orbit_velocity+tex_orbit_velocity)*mix(1.0,rand_from_seed(alt_seed),orbit_velocity_random);\n";
+		code += "		if (orbit_amount!=0.0) {\n";
+		code += "		     float ang = orbit_amount * DELTA * pi * 2.0;\n";
+		code += "		     mat2 rot = mat2(vec2(cos(ang),-sin(ang)),vec2(sin(ang),cos(ang)));\n";
+		code += "		     TRANSFORM[3].xy-=diff.xy;\n";
+		code += "		     TRANSFORM[3].xy+=rot * diff.xy;\n";
+		code += "		}\n";
+	}
+
+	if (tex_parameters[PARAM_INITIAL_LINEAR_VELOCITY].is_valid()) {
+		code += "		VELOCITY = normalize(VELOCITY)*tex_linear_velocity;\n";
+	}
+	code += "		if (damping + tex_damping > 0.0) {\n";
+	code += "		\n";
+	code += "			float v = length(VELOCITY);\n";
+	code += "			float damp = (damping+tex_damping)*mix(1.0,rand_from_seed(alt_seed),damping_random);\n";
+	code += "			v -= damp * DELTA;\n";
+	code += "			if (v < 0.0) {\n";
+	code += "				VELOCITY = vec3(0.0);\n";
+	code += "			} else {\n";
+	code += "				VELOCITY = normalize(VELOCITY) * v;\n";
+	code += "			}\n";
+	code += "		}\n";
+	code += "		float base_angle = (initial_angle+tex_angle)*mix(1.0,angle_rand,initial_angle_random);\n";
+	code += "		base_angle += CUSTOM.y*LIFETIME*(angular_velocity+tex_angular_velocity)*mix(1.0,rand_from_seed(alt_seed)*2.0-1.0,angular_velocity_random);\n";
+	code += "		CUSTOM.x = base_angle*degree_to_rad;\n"; //angle
+	code += "		CUSTOM.z = (anim_offset+tex_anim_offset)*mix(1.0,anim_offset_rand,anim_offset_random)+CUSTOM.y*(anim_speed+tex_anim_speed)*mix(1.0,rand_from_seed(alt_seed),anim_speed_random);\n"; //angle
+	if (flags[FLAG_ANIM_LOOP]) {
+		code += "		CUSTOM.z = mod(CUSTOM.z,1.0);\n"; //loop
+
+	} else {
+		code += "		CUSTOM.z = clamp(CUSTOM.z,0.0,1.0);\n"; //0 to 1 only
+	}
+	code += "	}\n";
+	//apply color
+	//apply hue rotation
+	if (tex_parameters[PARAM_SCALE].is_valid())
+		code += "	float tex_scale = textureLod(scale_texture,vec2(CUSTOM.y,0.0),0.0).r;\n";
+	else
+		code += "	float tex_scale = 1.0;\n";
+
+	if (tex_parameters[PARAM_HUE_VARIATION].is_valid())
+		code += "	float tex_hue_variation = textureLod(hue_variation_texture,vec2(CUSTOM.y,0.0),0.0).r;\n";
+	else
+		code += "	float tex_hue_variation = 0.0;\n";
+
+	code += "	float hue_rot_angle = (hue_variation+tex_hue_variation)*pi*2.0*mix(1.0,hue_rot_rand*2.0-1.0,hue_variation_random);\n";
+	code += "	float hue_rot_c = cos(hue_rot_angle);\n";
+	code += "	float hue_rot_s = sin(hue_rot_angle);\n";
+	code += "	mat4 hue_rot_mat = mat4( vec4(0.299,  0.587,  0.114, 0.0),\n";
+	code += "			vec4(0.299,  0.587,  0.114, 0.0),\n";
+	code += "			vec4(0.299,  0.587,  0.114, 0.0),\n";
+	code += "			vec4(0.000,  0.000,  0.000, 1.0)) +\n";
+	code += "		mat4( vec4(0.701, -0.587, -0.114, 0.0),\n";
+	code += "			vec4(-0.299,  0.413, -0.114, 0.0),\n";
+	code += "			vec4(-0.300, -0.588,  0.886, 0.0),\n";
+	code += "			vec4(0.000,  0.000,  0.000, 0.0)) * hue_rot_c +\n";
+	code += "		mat4( vec4(0.168,  0.330, -0.497, 0.0),\n";
+	code += "			vec4(-0.328,  0.035,  0.292, 0.0),\n";
+	code += "			vec4(1.250, -1.050, -0.203, 0.0),\n";
+	code += "			vec4(0.000,  0.000,  0.000, 0.0)) * hue_rot_s;\n";
+	if (color_ramp.is_valid()) {
+		code += "	COLOR = hue_rot_mat * textureLod(color_ramp,vec2(CUSTOM.y,0.0),0.0);\n";
+	} else {
+		code += "	COLOR = hue_rot_mat * color_value;\n";
+	}
+	if (emission_color_texture.is_valid() && emission_shape >= EMISSION_SHAPE_POINTS) {
+		code += "	COLOR*= texelFetch(emission_texture_color,emission_tex_ofs,0);\n";
+	}
+	if (trail_color_modifier.is_valid()) {
+		code += "	if (trail_divisor > 1) { COLOR *= textureLod(trail_color_modifier,vec2(float(int(NUMBER)%trail_divisor)/float(trail_divisor-1),0.0),0.0); }\n";
+	}
+	code += "\n";
+
+	if (flags[FLAG_DISABLE_Z]) {
+
+		if (flags[FLAG_ALIGN_Y_TO_VELOCITY]) {
+			code += "	if (length(VELOCITY) > 0.0) { TRANSFORM[1].xyz = normalize(VELOCITY); } else { TRANSFORM[1].xyz = normalize(TRANSFORM[1].xyz); }\n";
+			code += "	TRANSFORM[0].xyz = normalize(cross(TRANSFORM[1].xyz,TRANSFORM[2].xyz));\n";
+			code += "	TRANSFORM[2] = vec4(0.0,0.0,1.0,0.0);\n";
+		} else {
+			code += "	TRANSFORM[0] = vec4(cos(CUSTOM.x),-sin(CUSTOM.x),0.0,0.0);\n";
+			code += "	TRANSFORM[1] = vec4(sin(CUSTOM.x),cos(CUSTOM.x),0.0,0.0);\n";
+			code += "	TRANSFORM[2] = vec4(0.0,0.0,1.0,0.0);\n";
+		}
+
+	} else {
+		//orient particle Y towards velocity
+		if (flags[FLAG_ALIGN_Y_TO_VELOCITY]) {
+			code += "	if (length(VELOCITY) > 0.0) { TRANSFORM[1].xyz = normalize(VELOCITY); } else { TRANSFORM[1].xyz = normalize(TRANSFORM[1].xyz); }\n";
+			code += "	if (TRANSFORM[1].xyz == normalize(TRANSFORM[0].xyz)) {\n";
+			code += "		TRANSFORM[0].xyz = normalize(cross(normalize(TRANSFORM[1].xyz),normalize(TRANSFORM[2].xyz)));\n";
+			code += "		TRANSFORM[2].xyz = normalize(cross(normalize(TRANSFORM[0].xyz),normalize(TRANSFORM[1].xyz)));\n";
+			code += "	} else {\n";
+			code += "		TRANSFORM[2].xyz = normalize(cross(normalize(TRANSFORM[0].xyz),normalize(TRANSFORM[1].xyz)));\n";
+			code += "		TRANSFORM[0].xyz = normalize(cross(normalize(TRANSFORM[1].xyz),normalize(TRANSFORM[2].xyz)));\n";
+			code += "	}\n";
+		} else {
+			code += "	TRANSFORM[0].xyz = normalize(TRANSFORM[0].xyz);\n";
+			code += "	TRANSFORM[1].xyz = normalize(TRANSFORM[1].xyz);\n";
+			code += "	TRANSFORM[2].xyz = normalize(TRANSFORM[2].xyz);\n";
+		}
+		//turn particle by rotation in Y
+		if (flags[FLAG_ROTATE_Y]) {
+			code += "	TRANSFORM = TRANSFORM * mat4( vec4(cos(CUSTOM.x),0.0,-sin(CUSTOM.x),0.0), vec4(0.0,1.0,0.0,0.0),vec4(sin(CUSTOM.x),0.0,cos(CUSTOM.x),0.0),vec4(0.0,0.0,0.0,1.0));\n";
+		}
+	}
+	//scale by scale
+	code += "	float base_scale = mix(scale*tex_scale,1.0,scale_random*scale_rand);\n";
+	code += "	if (base_scale==0.0) base_scale=0.000001;\n";
+	if (trail_size_modifier.is_valid()) {
+		code += "	if (trail_divisor > 1) { base_scale *= textureLod(trail_size_modifier,vec2(float(int(NUMBER)%trail_divisor)/float(trail_divisor-1),0.0),0.0).r; } \n";
+	}
+
+	code += "	TRANSFORM[0].xyz *= base_scale;\n";
+	code += "	TRANSFORM[1].xyz *= base_scale;\n";
+	code += "	TRANSFORM[2].xyz *= base_scale;\n";
+	if (flags[FLAG_DISABLE_Z]) {
+		code += "	VELOCITY.z = 0.0;\n";
+		code += "	TRANSFORM[3].z = 0.0;\n";
+	}
+	code += "}\n";
+	code += "\n";
+
+	ShaderData shader_data;
+	shader_data.shader = VS::get_singleton()->shader_create();
+	shader_data.users = 1;
+
+	VS::get_singleton()->shader_set_code(shader_data.shader, code);
+
+	shader_map[mk] = shader_data;
+
+	VS::get_singleton()->material_set_shader(_get_material(), shader_data.shader);
+}
+
+void ParticlesMaterial::flush_changes() {
+
+	if (material_mutex)
+		material_mutex->lock();
+
+	while (dirty_materials.first()) {
+
+		dirty_materials.first()->self()->_update_shader();
+	}
+
+	if (material_mutex)
+		material_mutex->unlock();
+}
+
+void ParticlesMaterial::_queue_shader_change() {
+
+	if (material_mutex)
+		material_mutex->lock();
+
+	if (!element.in_list()) {
+		dirty_materials.add(&element);
+	}
+
+	if (material_mutex)
+		material_mutex->unlock();
+}
+
+bool ParticlesMaterial::_is_shader_dirty() const {
+
+	bool dirty = false;
+
+	if (material_mutex)
+		material_mutex->lock();
+
+	dirty = element.in_list();
+
+	if (material_mutex)
+		material_mutex->unlock();
+
+	return dirty;
+}
+
+void ParticlesMaterial::set_spread(float p_spread) {
+
+	spread = p_spread;
+	VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->spread, p_spread);
+}
+
+float ParticlesMaterial::get_spread() const {
+
+	return spread;
+}
+
+void ParticlesMaterial::set_flatness(float p_flatness) {
+
+	flatness = p_flatness;
+	VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->flatness, p_flatness);
+}
+float ParticlesMaterial::get_flatness() const {
+
+	return flatness;
+}
+
+void ParticlesMaterial::set_param(Parameter p_param, float p_value) {
+
+	ERR_FAIL_INDEX(p_param, PARAM_MAX);
+
+	parameters[p_param] = p_value;
+
+	switch (p_param) {
+		case PARAM_INITIAL_LINEAR_VELOCITY: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->initial_linear_velocity, p_value);
+		} break;
+		case PARAM_ANGULAR_VELOCITY: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->angular_velocity, p_value);
+		} break;
+		case PARAM_ORBIT_VELOCITY: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->orbit_velocity, p_value);
+		} break;
+		case PARAM_LINEAR_ACCEL: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->linear_accel, p_value);
+		} break;
+		case PARAM_RADIAL_ACCEL: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->radial_accel, p_value);
+		} break;
+		case PARAM_TANGENTIAL_ACCEL: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->tangent_accel, p_value);
+		} break;
+		case PARAM_DAMPING: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->damping, p_value);
+		} break;
+		case PARAM_ANGLE: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->initial_angle, p_value);
+		} break;
+		case PARAM_SCALE: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->scale, p_value);
+		} break;
+		case PARAM_HUE_VARIATION: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->hue_variation, p_value);
+		} break;
+		case PARAM_ANIM_SPEED: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->anim_speed, p_value);
+		} break;
+		case PARAM_ANIM_OFFSET: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->anim_offset, p_value);
+		} break;
+	}
+}
+float ParticlesMaterial::get_param(Parameter p_param) const {
+
+	ERR_FAIL_INDEX_V(p_param, PARAM_MAX, 0);
+
+	return parameters[p_param];
+}
+
+void ParticlesMaterial::set_param_randomness(Parameter p_param, float p_value) {
+
+	ERR_FAIL_INDEX(p_param, PARAM_MAX);
+
+	randomness[p_param] = p_value;
+
+	switch (p_param) {
+		case PARAM_INITIAL_LINEAR_VELOCITY: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->initial_linear_velocity_random, p_value);
+		} break;
+		case PARAM_ANGULAR_VELOCITY: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->angular_velocity_random, p_value);
+		} break;
+		case PARAM_ORBIT_VELOCITY: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->orbit_velocity_random, p_value);
+		} break;
+		case PARAM_LINEAR_ACCEL: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->linear_accel_random, p_value);
+		} break;
+		case PARAM_RADIAL_ACCEL: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->radial_accel_random, p_value);
+		} break;
+		case PARAM_TANGENTIAL_ACCEL: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->tangent_accel_random, p_value);
+		} break;
+		case PARAM_DAMPING: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->damping_random, p_value);
+		} break;
+		case PARAM_ANGLE: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->initial_angle_random, p_value);
+		} break;
+		case PARAM_SCALE: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->scale_random, p_value);
+		} break;
+		case PARAM_HUE_VARIATION: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->hue_variation_random, p_value);
+		} break;
+		case PARAM_ANIM_SPEED: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->anim_speed_random, p_value);
+		} break;
+		case PARAM_ANIM_OFFSET: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->anim_offset_random, p_value);
+		} break;
+	}
+}
+float ParticlesMaterial::get_param_randomness(Parameter p_param) const {
+
+	ERR_FAIL_INDEX_V(p_param, PARAM_MAX, 0);
+
+	return randomness[p_param];
+}
+
+static void _adjust_curve_range(const Ref<Texture> &p_texture, float p_min, float p_max) {
+
+	Ref<CurveTexture> curve_tex = p_texture;
+	if (!curve_tex.is_valid())
+		return;
+
+	curve_tex->ensure_default_setup(p_min, p_max);
+}
+
+void ParticlesMaterial::set_param_texture(Parameter p_param, const Ref<Texture> &p_texture) {
+
+	ERR_FAIL_INDEX(p_param, PARAM_MAX);
+
+	tex_parameters[p_param] = p_texture;
+
+	switch (p_param) {
+		case PARAM_INITIAL_LINEAR_VELOCITY: {
+			//do none for this one
+		} break;
+		case PARAM_ANGULAR_VELOCITY: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->angular_velocity_texture, p_texture);
+			_adjust_curve_range(p_texture, -360, 360);
+		} break;
+		case PARAM_ORBIT_VELOCITY: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->orbit_velocity_texture, p_texture);
+			_adjust_curve_range(p_texture, -500, 500);
+		} break;
+		case PARAM_LINEAR_ACCEL: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->linear_accel_texture, p_texture);
+			_adjust_curve_range(p_texture, -200, 200);
+		} break;
+		case PARAM_RADIAL_ACCEL: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->radial_accel_texture, p_texture);
+			_adjust_curve_range(p_texture, -200, 200);
+		} break;
+		case PARAM_TANGENTIAL_ACCEL: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->tangent_accel_texture, p_texture);
+			_adjust_curve_range(p_texture, -200, 200);
+		} break;
+		case PARAM_DAMPING: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->damping_texture, p_texture);
+			_adjust_curve_range(p_texture, 0, 100);
+		} break;
+		case PARAM_ANGLE: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->angle_texture, p_texture);
+			_adjust_curve_range(p_texture, -360, 360);
+		} break;
+		case PARAM_SCALE: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->scale_texture, p_texture);
+
+			Ref<CurveTexture> curve_tex = p_texture;
+			if (curve_tex.is_valid()) {
+				curve_tex->ensure_default_setup();
+			}
+
+		} break;
+		case PARAM_HUE_VARIATION: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->hue_variation_texture, p_texture);
+			_adjust_curve_range(p_texture, -1, 1);
+		} break;
+		case PARAM_ANIM_SPEED: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->anim_speed_texture, p_texture);
+			_adjust_curve_range(p_texture, 0, 200);
+		} break;
+		case PARAM_ANIM_OFFSET: {
+			VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->anim_offset_texture, p_texture);
+		} break;
+	}
+
+	_queue_shader_change();
+}
+Ref<Texture> ParticlesMaterial::get_param_texture(Parameter p_param) const {
+
+	ERR_FAIL_INDEX_V(p_param, PARAM_MAX, Ref<Texture>());
+
+	return tex_parameters[p_param];
+}
+
+void ParticlesMaterial::set_color(const Color &p_color) {
+
+	VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->color, p_color);
+	color = p_color;
+}
+
+Color ParticlesMaterial::get_color() const {
+
+	return color;
+}
+
+void ParticlesMaterial::set_color_ramp(const Ref<Texture> &p_texture) {
+
+	color_ramp = p_texture;
+	VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->color_ramp, p_texture);
+	_queue_shader_change();
+	_change_notify();
+}
+
+Ref<Texture> ParticlesMaterial::get_color_ramp() const {
+
+	return color_ramp;
+}
+
+void ParticlesMaterial::set_flag(Flags p_flag, bool p_enable) {
+	ERR_FAIL_INDEX(p_flag, FLAG_MAX);
+	flags[p_flag] = p_enable;
+	_queue_shader_change();
+	if (p_flag == FLAG_DISABLE_Z) {
+		_change_notify();
+	}
+}
+
+bool ParticlesMaterial::get_flag(Flags p_flag) const {
+	ERR_FAIL_INDEX_V(p_flag, FLAG_MAX, false);
+	return flags[p_flag];
+}
+
+void ParticlesMaterial::set_emission_shape(EmissionShape p_shape) {
+
+	emission_shape = p_shape;
+	_change_notify();
+	_queue_shader_change();
+}
+
+void ParticlesMaterial::set_emission_sphere_radius(float p_radius) {
+
+	emission_sphere_radius = p_radius;
+	VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->emission_sphere_radius, p_radius);
+}
+
+void ParticlesMaterial::set_emission_box_extents(Vector3 p_extents) {
+
+	emission_box_extents = p_extents;
+	VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->emission_box_extents, p_extents);
+}
+
+void ParticlesMaterial::set_emission_point_texture(const Ref<Texture> &p_points) {
+
+	emission_point_texture = p_points;
+	VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->emission_texture_points, p_points);
+}
+
+void ParticlesMaterial::set_emission_normal_texture(const Ref<Texture> &p_normals) {
+
+	emission_normal_texture = p_normals;
+	VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->emission_texture_normal, p_normals);
+}
+
+void ParticlesMaterial::set_emission_color_texture(const Ref<Texture> &p_colors) {
+
+	emission_color_texture = p_colors;
+	VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->emission_texture_color, p_colors);
+	_queue_shader_change();
+}
+
+void ParticlesMaterial::set_emission_point_count(int p_count) {
+
+	emission_point_count = p_count;
+	VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->emission_texture_point_count, p_count);
+}
+
+ParticlesMaterial::EmissionShape ParticlesMaterial::get_emission_shape() const {
+
+	return emission_shape;
+}
+
+float ParticlesMaterial::get_emission_sphere_radius() const {
+
+	return emission_sphere_radius;
+}
+Vector3 ParticlesMaterial::get_emission_box_extents() const {
+
+	return emission_box_extents;
+}
+Ref<Texture> ParticlesMaterial::get_emission_point_texture() const {
+
+	return emission_point_texture;
+}
+Ref<Texture> ParticlesMaterial::get_emission_normal_texture() const {
+
+	return emission_normal_texture;
+}
+
+Ref<Texture> ParticlesMaterial::get_emission_color_texture() const {
+
+	return emission_color_texture;
+}
+
+int ParticlesMaterial::get_emission_point_count() const {
+
+	return emission_point_count;
+}
+
+void ParticlesMaterial::set_trail_divisor(int p_divisor) {
+
+	trail_divisor = p_divisor;
+	VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->trail_divisor, p_divisor);
+}
+
+int ParticlesMaterial::get_trail_divisor() const {
+
+	return trail_divisor;
+}
+
+void ParticlesMaterial::set_trail_size_modifier(const Ref<CurveTexture> &p_trail_size_modifier) {
+
+	trail_size_modifier = p_trail_size_modifier;
+
+	Ref<CurveTexture> curve = trail_size_modifier;
+	if (curve.is_valid()) {
+		curve->ensure_default_setup();
+	}
+
+	VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->trail_size_modifier, curve);
+	_queue_shader_change();
+}
+
+Ref<CurveTexture> ParticlesMaterial::get_trail_size_modifier() const {
+
+	return trail_size_modifier;
+}
+
+void ParticlesMaterial::set_trail_color_modifier(const Ref<GradientTexture> &p_trail_color_modifier) {
+
+	trail_color_modifier = p_trail_color_modifier;
+	VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->trail_color_modifier, p_trail_color_modifier);
+	_queue_shader_change();
+}
+
+Ref<GradientTexture> ParticlesMaterial::get_trail_color_modifier() const {
+
+	return trail_color_modifier;
+}
+
+void ParticlesMaterial::set_gravity(const Vector3 &p_gravity) {
+
+	gravity = p_gravity;
+	Vector3 gset = gravity;
+	if (gset == Vector3()) {
+		gset = Vector3(0, -0.000001, 0); //as gravity is used as upvector in some calculations
+	}
+	VisualServer::get_singleton()->material_set_param(_get_material(), shader_names->gravity, gset);
+}
+
+Vector3 ParticlesMaterial::get_gravity() const {
+
+	return gravity;
+}
+
+RID ParticlesMaterial::get_shader_rid() const {
+
+	ERR_FAIL_COND_V(!shader_map.has(current_key), RID());
+	return shader_map[current_key].shader;
+}
+
+void ParticlesMaterial::_validate_property(PropertyInfo &property) const {
+
+	if (property.name == "color" && color_ramp.is_valid()) {
+		property.usage = 0;
+	}
+
+	if (property.name == "emission_sphere_radius" && emission_shape != EMISSION_SHAPE_SPHERE) {
+		property.usage = 0;
+	}
+
+	if (property.name == "emission_box_extents" && emission_shape != EMISSION_SHAPE_BOX) {
+		property.usage = 0;
+	}
+
+	if ((property.name == "emission_point_texture" || property.name == "emission_color_texture") && (emission_shape < EMISSION_SHAPE_POINTS)) {
+		property.usage = 0;
+	}
+
+	if (property.name == "emission_normal_texture" && emission_shape != EMISSION_SHAPE_DIRECTED_POINTS) {
+		property.usage = 0;
+	}
+
+	if (property.name == "emission_point_count" && (emission_shape != EMISSION_SHAPE_POINTS && emission_shape != EMISSION_SHAPE_DIRECTED_POINTS)) {
+		property.usage = 0;
+	}
+
+	if (property.name.begins_with("orbit_") && !flags[FLAG_DISABLE_Z]) {
+		property.usage = 0;
+	}
+}
+
+Shader::Mode ParticlesMaterial::get_shader_mode() const {
+
+	return Shader::MODE_PARTICLES;
+}
+
+void ParticlesMaterial::_bind_methods() {
+
+	ClassDB::bind_method(D_METHOD("set_spread", "degrees"), &ParticlesMaterial::set_spread);
+	ClassDB::bind_method(D_METHOD("get_spread"), &ParticlesMaterial::get_spread);
+
+	ClassDB::bind_method(D_METHOD("set_flatness", "amount"), &ParticlesMaterial::set_flatness);
+	ClassDB::bind_method(D_METHOD("get_flatness"), &ParticlesMaterial::get_flatness);
+
+	ClassDB::bind_method(D_METHOD("set_param", "param", "value"), &ParticlesMaterial::set_param);
+	ClassDB::bind_method(D_METHOD("get_param", "param"), &ParticlesMaterial::get_param);
+
+	ClassDB::bind_method(D_METHOD("set_param_randomness", "param", "randomness"), &ParticlesMaterial::set_param_randomness);
+	ClassDB::bind_method(D_METHOD("get_param_randomness", "param"), &ParticlesMaterial::get_param_randomness);
+
+	ClassDB::bind_method(D_METHOD("set_param_texture", "param", "texture"), &ParticlesMaterial::set_param_texture);
+	ClassDB::bind_method(D_METHOD("get_param_texture", "param"), &ParticlesMaterial::get_param_texture);
+
+	ClassDB::bind_method(D_METHOD("set_color", "color"), &ParticlesMaterial::set_color);
+	ClassDB::bind_method(D_METHOD("get_color"), &ParticlesMaterial::get_color);
+
+	ClassDB::bind_method(D_METHOD("set_color_ramp", "ramp"), &ParticlesMaterial::set_color_ramp);
+	ClassDB::bind_method(D_METHOD("get_color_ramp"), &ParticlesMaterial::get_color_ramp);
+
+	ClassDB::bind_method(D_METHOD("set_flag", "flag", "enable"), &ParticlesMaterial::set_flag);
+	ClassDB::bind_method(D_METHOD("get_flag", "flag"), &ParticlesMaterial::get_flag);
+
+	ClassDB::bind_method(D_METHOD("set_emission_shape", "shape"), &ParticlesMaterial::set_emission_shape);
+	ClassDB::bind_method(D_METHOD("get_emission_shape"), &ParticlesMaterial::get_emission_shape);
+
+	ClassDB::bind_method(D_METHOD("set_emission_sphere_radius", "radius"), &ParticlesMaterial::set_emission_sphere_radius);
+	ClassDB::bind_method(D_METHOD("get_emission_sphere_radius"), &ParticlesMaterial::get_emission_sphere_radius);
+
+	ClassDB::bind_method(D_METHOD("set_emission_box_extents", "extents"), &ParticlesMaterial::set_emission_box_extents);
+	ClassDB::bind_method(D_METHOD("get_emission_box_extents"), &ParticlesMaterial::get_emission_box_extents);
+
+	ClassDB::bind_method(D_METHOD("set_emission_point_texture", "texture"), &ParticlesMaterial::set_emission_point_texture);
+	ClassDB::bind_method(D_METHOD("get_emission_point_texture"), &ParticlesMaterial::get_emission_point_texture);
+
+	ClassDB::bind_method(D_METHOD("set_emission_normal_texture", "texture"), &ParticlesMaterial::set_emission_normal_texture);
+	ClassDB::bind_method(D_METHOD("get_emission_normal_texture"), &ParticlesMaterial::get_emission_normal_texture);
+
+	ClassDB::bind_method(D_METHOD("set_emission_color_texture", "texture"), &ParticlesMaterial::set_emission_color_texture);
+	ClassDB::bind_method(D_METHOD("get_emission_color_texture"), &ParticlesMaterial::get_emission_color_texture);
+
+	ClassDB::bind_method(D_METHOD("set_emission_point_count", "point_count"), &ParticlesMaterial::set_emission_point_count);
+	ClassDB::bind_method(D_METHOD("get_emission_point_count"), &ParticlesMaterial::get_emission_point_count);
+
+	ClassDB::bind_method(D_METHOD("set_trail_divisor", "divisor"), &ParticlesMaterial::set_trail_divisor);
+	ClassDB::bind_method(D_METHOD("get_trail_divisor"), &ParticlesMaterial::get_trail_divisor);
+
+	ClassDB::bind_method(D_METHOD("set_trail_size_modifier", "texture"), &ParticlesMaterial::set_trail_size_modifier);
+	ClassDB::bind_method(D_METHOD("get_trail_size_modifier"), &ParticlesMaterial::get_trail_size_modifier);
+
+	ClassDB::bind_method(D_METHOD("set_trail_color_modifier", "texture"), &ParticlesMaterial::set_trail_color_modifier);
+	ClassDB::bind_method(D_METHOD("get_trail_color_modifier"), &ParticlesMaterial::get_trail_color_modifier);
+
+	ClassDB::bind_method(D_METHOD("get_gravity"), &ParticlesMaterial::get_gravity);
+	ClassDB::bind_method(D_METHOD("set_gravity", "accel_vec"), &ParticlesMaterial::set_gravity);
+
+	ADD_GROUP("Trail", "trail_");
+	ADD_PROPERTY(PropertyInfo(Variant::INT, "trail_divisor", PROPERTY_HINT_RANGE, "1,1000000,1"), "set_trail_divisor", "get_trail_divisor");
+	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "trail_size_modifier", PROPERTY_HINT_RESOURCE_TYPE, "CurveTexture"), "set_trail_size_modifier", "get_trail_size_modifier");
+	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "trail_color_modifier", PROPERTY_HINT_RESOURCE_TYPE, "GradientTexture"), "set_trail_color_modifier", "get_trail_color_modifier");
+	ADD_GROUP("Emission Shape", "emission_");
+	ADD_PROPERTY(PropertyInfo(Variant::INT, "emission_shape", PROPERTY_HINT_ENUM, "Point,Sphere,Box,Points,Directed Points"), "set_emission_shape", "get_emission_shape");
+	ADD_PROPERTY(PropertyInfo(Variant::REAL, "emission_sphere_radius", PROPERTY_HINT_RANGE, "0.01,128,0.01,or_greater"), "set_emission_sphere_radius", "get_emission_sphere_radius");
+	ADD_PROPERTY(PropertyInfo(Variant::VECTOR3, "emission_box_extents"), "set_emission_box_extents", "get_emission_box_extents");
+	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "emission_point_texture", PROPERTY_HINT_RESOURCE_TYPE, "Texture"), "set_emission_point_texture", "get_emission_point_texture");
+	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "emission_normal_texture", PROPERTY_HINT_RESOURCE_TYPE, "Texture"), "set_emission_normal_texture", "get_emission_normal_texture");
+	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "emission_color_texture", PROPERTY_HINT_RESOURCE_TYPE, "Texture"), "set_emission_color_texture", "get_emission_color_texture");
+	ADD_PROPERTY(PropertyInfo(Variant::INT, "emission_point_count", PROPERTY_HINT_RANGE, "0,1000000,1"), "set_emission_point_count", "get_emission_point_count");
+	ADD_GROUP("Flags", "flag_");
+	ADD_PROPERTYI(PropertyInfo(Variant::BOOL, "flag_align_y"), "set_flag", "get_flag", FLAG_ALIGN_Y_TO_VELOCITY);
+	ADD_PROPERTYI(PropertyInfo(Variant::BOOL, "flag_rotate_y"), "set_flag", "get_flag", FLAG_ROTATE_Y);
+	ADD_PROPERTYI(PropertyInfo(Variant::BOOL, "flag_disable_z"), "set_flag", "get_flag", FLAG_DISABLE_Z);
+	ADD_GROUP("Spread", "");
+	ADD_PROPERTY(PropertyInfo(Variant::REAL, "spread", PROPERTY_HINT_RANGE, "0,180,0.01"), "set_spread", "get_spread");
+	ADD_PROPERTY(PropertyInfo(Variant::REAL, "flatness", PROPERTY_HINT_RANGE, "0,1,0.01"), "set_flatness", "get_flatness");
+	ADD_GROUP("Gravity", "");
+	ADD_PROPERTY(PropertyInfo(Variant::VECTOR3, "gravity"), "set_gravity", "get_gravity");
+	ADD_GROUP("Initial Velocity", "initial_");
+	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "initial_velocity", PROPERTY_HINT_RANGE, "0,1000,0.01,or_greater"), "set_param", "get_param", PARAM_INITIAL_LINEAR_VELOCITY);
+	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "initial_velocity_random", PROPERTY_HINT_RANGE, "0,1,0.01"), "set_param_randomness", "get_param_randomness", PARAM_INITIAL_LINEAR_VELOCITY);
+	ADD_GROUP("Angular Velocity", "angular_");
+	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "angular_velocity", PROPERTY_HINT_RANGE, "-360,360,0.01"), "set_param", "get_param", PARAM_ANGULAR_VELOCITY);
+	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "angular_velocity_random", PROPERTY_HINT_RANGE, "0,1,0.01"), "set_param_randomness", "get_param_randomness", PARAM_ANGULAR_VELOCITY);
+	ADD_PROPERTYI(PropertyInfo(Variant::OBJECT, "angular_velocity_curve", PROPERTY_HINT_RESOURCE_TYPE, "CurveTexture"), "set_param_texture", "get_param_texture", PARAM_ANGULAR_VELOCITY);
+	ADD_GROUP("Orbit Velocity", "orbit_");
+	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "orbit_velocity", PROPERTY_HINT_RANGE, "-1000,1000,0.01,or_lesser,or_greater"), "set_param", "get_param", PARAM_ORBIT_VELOCITY);
+	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "orbit_velocity_random", PROPERTY_HINT_RANGE, "0,1,0.01"), "set_param_randomness", "get_param_randomness", PARAM_ORBIT_VELOCITY);
+	ADD_PROPERTYI(PropertyInfo(Variant::OBJECT, "orbit_velocity_curve", PROPERTY_HINT_RESOURCE_TYPE, "CurveTexture"), "set_param_texture", "get_param_texture", PARAM_ORBIT_VELOCITY);
+	ADD_GROUP("Linear Accel", "linear_");
+	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "linear_accel", PROPERTY_HINT_RANGE, "-100,100,0.01,or_lesser,or_greater"), "set_param", "get_param", PARAM_LINEAR_ACCEL);
+	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "linear_accel_random", PROPERTY_HINT_RANGE, "0,1,0.01"), "set_param_randomness", "get_param_randomness", PARAM_LINEAR_ACCEL);
+	ADD_PROPERTYI(PropertyInfo(Variant::OBJECT, "linear_accel_curve", PROPERTY_HINT_RESOURCE_TYPE, "CurveTexture"), "set_param_texture", "get_param_texture", PARAM_LINEAR_ACCEL);
+	ADD_GROUP("Radial Accel", "radial_");
+	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "radial_accel", PROPERTY_HINT_RANGE, "-100,100,0.01,or_lesser,or_greater"), "set_param", "get_param", PARAM_RADIAL_ACCEL);
+	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "radial_accel_random", PROPERTY_HINT_RANGE, "0,1,0.01"), "set_param_randomness", "get_param_randomness", PARAM_RADIAL_ACCEL);
+	ADD_PROPERTYI(PropertyInfo(Variant::OBJECT, "radial_accel_curve", PROPERTY_HINT_RESOURCE_TYPE, "CurveTexture"), "set_param_texture", "get_param_texture", PARAM_RADIAL_ACCEL);
+	ADD_GROUP("Tangential Accel", "tangential_");
+	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "tangential_accel", PROPERTY_HINT_RANGE, "-100,100,0.01,or_lesser,or_greater"), "set_param", "get_param", PARAM_TANGENTIAL_ACCEL);
+	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "tangential_accel_random", PROPERTY_HINT_RANGE, "0,1,0.01"), "set_param_randomness", "get_param_randomness", PARAM_TANGENTIAL_ACCEL);
+	ADD_PROPERTYI(PropertyInfo(Variant::OBJECT, "tangential_accel_curve", PROPERTY_HINT_RESOURCE_TYPE, "CurveTexture"), "set_param_texture", "get_param_texture", PARAM_TANGENTIAL_ACCEL);
+	ADD_GROUP("Damping", "");
+	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "damping", PROPERTY_HINT_RANGE, "0,100,0.01,or_greater"), "set_param", "get_param", PARAM_DAMPING);
+	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "damping_random", PROPERTY_HINT_RANGE, "0,1,0.01"), "set_param_randomness", "get_param_randomness", PARAM_DAMPING);
+	ADD_PROPERTYI(PropertyInfo(Variant::OBJECT, "damping_curve", PROPERTY_HINT_RESOURCE_TYPE, "CurveTexture"), "set_param_texture", "get_param_texture", PARAM_DAMPING);
+	ADD_GROUP("Angle", "");
+	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "angle", PROPERTY_HINT_RANGE, "-720,720,0.1,or_lesser,or_greater"), "set_param", "get_param", PARAM_ANGLE);
+	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "angle_random", PROPERTY_HINT_RANGE, "0,1,0.01"), "set_param_randomness", "get_param_randomness", PARAM_ANGLE);
+	ADD_PROPERTYI(PropertyInfo(Variant::OBJECT, "angle_curve", PROPERTY_HINT_RESOURCE_TYPE, "CurveTexture"), "set_param_texture", "get_param_texture", PARAM_ANGLE);
+	ADD_GROUP("Scale", "");
+	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "scale", PROPERTY_HINT_RANGE, "0,1000,0.01,or_greater"), "set_param", "get_param", PARAM_SCALE);
+	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "scale_random", PROPERTY_HINT_RANGE, "0,1,0.01"), "set_param_randomness", "get_param_randomness", PARAM_SCALE);
+	ADD_PROPERTYI(PropertyInfo(Variant::OBJECT, "scale_curve", PROPERTY_HINT_RESOURCE_TYPE, "CurveTexture"), "set_param_texture", "get_param_texture", PARAM_SCALE);
+	ADD_GROUP("Color", "");
+	ADD_PROPERTY(PropertyInfo(Variant::COLOR, "color"), "set_color", "get_color");
+	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "color_ramp", PROPERTY_HINT_RESOURCE_TYPE, "GradientTexture"), "set_color_ramp", "get_color_ramp");
+
+	ADD_GROUP("Hue Variation", "hue_");
+	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "hue_variation", PROPERTY_HINT_RANGE, "-1,1,0.1"), "set_param", "get_param", PARAM_HUE_VARIATION);
+	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "hue_variation_random", PROPERTY_HINT_RANGE, "0,1,0.01"), "set_param_randomness", "get_param_randomness", PARAM_HUE_VARIATION);
+	ADD_PROPERTYI(PropertyInfo(Variant::OBJECT, "hue_variation_curve", PROPERTY_HINT_RESOURCE_TYPE, "CurveTexture"), "set_param_texture", "get_param_texture", PARAM_HUE_VARIATION);
+	ADD_GROUP("Animation", "anim_");
+	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "anim_speed", PROPERTY_HINT_RANGE, "0,128,0.01,or_greater"), "set_param", "get_param", PARAM_ANIM_SPEED);
+	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "anim_speed_random", PROPERTY_HINT_RANGE, "0,1,0.01"), "set_param_randomness", "get_param_randomness", PARAM_ANIM_SPEED);
+	ADD_PROPERTYI(PropertyInfo(Variant::OBJECT, "anim_speed_curve", PROPERTY_HINT_RESOURCE_TYPE, "CurveTexture"), "set_param_texture", "get_param_texture", PARAM_ANIM_SPEED);
+	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "anim_offset", PROPERTY_HINT_RANGE, "0,1,0.01"), "set_param", "get_param", PARAM_ANIM_OFFSET);
+	ADD_PROPERTYI(PropertyInfo(Variant::REAL, "anim_offset_random", PROPERTY_HINT_RANGE, "0,1,0.01"), "set_param_randomness", "get_param_randomness", PARAM_ANIM_OFFSET);
+	ADD_PROPERTYI(PropertyInfo(Variant::OBJECT, "anim_offset_curve", PROPERTY_HINT_RESOURCE_TYPE, "CurveTexture"), "set_param_texture", "get_param_texture", PARAM_ANIM_OFFSET);
+	ADD_PROPERTYI(PropertyInfo(Variant::BOOL, "anim_loop"), "set_flag", "get_flag", FLAG_ANIM_LOOP);
+
+	BIND_ENUM_CONSTANT(PARAM_INITIAL_LINEAR_VELOCITY);
+	BIND_ENUM_CONSTANT(PARAM_ANGULAR_VELOCITY);
+	BIND_ENUM_CONSTANT(PARAM_ORBIT_VELOCITY);
+	BIND_ENUM_CONSTANT(PARAM_LINEAR_ACCEL);
+	BIND_ENUM_CONSTANT(PARAM_RADIAL_ACCEL);
+	BIND_ENUM_CONSTANT(PARAM_TANGENTIAL_ACCEL);
+	BIND_ENUM_CONSTANT(PARAM_DAMPING);
+	BIND_ENUM_CONSTANT(PARAM_ANGLE);
+	BIND_ENUM_CONSTANT(PARAM_SCALE);
+	BIND_ENUM_CONSTANT(PARAM_HUE_VARIATION);
+	BIND_ENUM_CONSTANT(PARAM_ANIM_SPEED);
+	BIND_ENUM_CONSTANT(PARAM_ANIM_OFFSET);
+	BIND_ENUM_CONSTANT(PARAM_MAX);
+
+	BIND_ENUM_CONSTANT(FLAG_ALIGN_Y_TO_VELOCITY);
+	BIND_ENUM_CONSTANT(FLAG_ROTATE_Y);
+	BIND_ENUM_CONSTANT(FLAG_MAX);
+
+	BIND_ENUM_CONSTANT(EMISSION_SHAPE_POINT);
+	BIND_ENUM_CONSTANT(EMISSION_SHAPE_SPHERE);
+	BIND_ENUM_CONSTANT(EMISSION_SHAPE_BOX);
+	BIND_ENUM_CONSTANT(EMISSION_SHAPE_POINTS);
+	BIND_ENUM_CONSTANT(EMISSION_SHAPE_DIRECTED_POINTS);
+}
+
+ParticlesMaterial::ParticlesMaterial() :
+		element(this) {
+
+	set_spread(45);
+	set_flatness(0);
+	set_param(PARAM_INITIAL_LINEAR_VELOCITY, 1);
+	set_param(PARAM_ORBIT_VELOCITY, 0);
+	set_param(PARAM_LINEAR_ACCEL, 0);
+	set_param(PARAM_RADIAL_ACCEL, 0);
+	set_param(PARAM_TANGENTIAL_ACCEL, 0);
+	set_param(PARAM_DAMPING, 0);
+	set_param(PARAM_ANGLE, 0);
+	set_param(PARAM_SCALE, 1);
+	set_param(PARAM_HUE_VARIATION, 0);
+	set_param(PARAM_ANIM_SPEED, 0);
+	set_param(PARAM_ANIM_OFFSET, 0);
+	set_emission_shape(EMISSION_SHAPE_POINT);
+	set_emission_sphere_radius(1);
+	set_emission_box_extents(Vector3(1, 1, 1));
+	set_trail_divisor(1);
+	set_gravity(Vector3(0, -9.8, 0));
+	emission_point_count = 1;
+
+	for (int i = 0; i < PARAM_MAX; i++) {
+		set_param_randomness(Parameter(i), 0);
+	}
+
+	for (int i = 0; i < FLAG_MAX; i++) {
+		flags[i] = false;
+	}
+
+	set_color(Color(1, 1, 1, 1));
+
+	current_key.key = 0;
+	current_key.invalid_key = 1;
+
+	_queue_shader_change();
+}
+
+ParticlesMaterial::~ParticlesMaterial() {
+
+	if (material_mutex)
+		material_mutex->lock();
+
+	if (shader_map.has(current_key)) {
+		shader_map[current_key].users--;
+		if (shader_map[current_key].users == 0) {
+			//deallocate shader, as it's no longer in use
+			VS::get_singleton()->free(shader_map[current_key].shader);
+			shader_map.erase(current_key);
+		}
+
+		VS::get_singleton()->material_set_shader(_get_material(), RID());
+	}
+
+	if (material_mutex)
+		material_mutex->unlock();
+}
diff --git a/scene/resources/particles_material.h b/scene/resources/particles_material.h
new file mode 100644
index 0000000000..8090926fa3
--- /dev/null
+++ b/scene/resources/particles_material.h
@@ -0,0 +1,302 @@
+/*************************************************************************/
+/*  particles_material.h                                                 */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md)    */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#include "rid.h"
+#include "scene/resources/material.h"
+
+#ifndef PARTICLES_MATERIAL_H
+#define PARTICLES_MATERIAL_H
+
+class ParticlesMaterial : public Material {
+
+	GDCLASS(ParticlesMaterial, Material)
+
+public:
+	enum Parameter {
+
+		PARAM_INITIAL_LINEAR_VELOCITY,
+		PARAM_ANGULAR_VELOCITY,
+		PARAM_ORBIT_VELOCITY,
+		PARAM_LINEAR_ACCEL,
+		PARAM_RADIAL_ACCEL,
+		PARAM_TANGENTIAL_ACCEL,
+		PARAM_DAMPING,
+		PARAM_ANGLE,
+		PARAM_SCALE,
+		PARAM_HUE_VARIATION,
+		PARAM_ANIM_SPEED,
+		PARAM_ANIM_OFFSET,
+		PARAM_MAX
+	};
+
+	enum Flags {
+		FLAG_ALIGN_Y_TO_VELOCITY,
+		FLAG_ROTATE_Y,
+		FLAG_DISABLE_Z,
+		FLAG_ANIM_LOOP,
+		FLAG_MAX
+	};
+
+	enum EmissionShape {
+		EMISSION_SHAPE_POINT,
+		EMISSION_SHAPE_SPHERE,
+		EMISSION_SHAPE_BOX,
+		EMISSION_SHAPE_POINTS,
+		EMISSION_SHAPE_DIRECTED_POINTS,
+	};
+
+private:
+	union MaterialKey {
+
+		struct {
+			uint32_t texture_mask : 16;
+			uint32_t texture_color : 1;
+			uint32_t flags : 4;
+			uint32_t emission_shape : 2;
+			uint32_t trail_size_texture : 1;
+			uint32_t trail_color_texture : 1;
+			uint32_t invalid_key : 1;
+			uint32_t has_emission_color : 1;
+		};
+
+		uint32_t key;
+
+		bool operator<(const MaterialKey &p_key) const {
+			return key < p_key.key;
+		}
+	};
+
+	struct ShaderData {
+		RID shader;
+		int users;
+	};
+
+	static Map<MaterialKey, ShaderData> shader_map;
+
+	MaterialKey current_key;
+
+	_FORCE_INLINE_ MaterialKey _compute_key() const {
+
+		MaterialKey mk;
+		mk.key = 0;
+		for (int i = 0; i < PARAM_MAX; i++) {
+			if (tex_parameters[i].is_valid()) {
+				mk.texture_mask |= (1 << i);
+			}
+		}
+		for (int i = 0; i < FLAG_MAX; i++) {
+			if (flags[i]) {
+				mk.flags |= (1 << i);
+			}
+		}
+
+		mk.texture_color = color_ramp.is_valid() ? 1 : 0;
+		mk.emission_shape = emission_shape;
+		mk.trail_color_texture = trail_color_modifier.is_valid() ? 1 : 0;
+		mk.trail_size_texture = trail_size_modifier.is_valid() ? 1 : 0;
+		mk.has_emission_color = emission_shape >= EMISSION_SHAPE_POINTS && emission_color_texture.is_valid();
+
+		return mk;
+	}
+
+	static Mutex *material_mutex;
+	static SelfList<ParticlesMaterial>::List dirty_materials;
+
+	struct ShaderNames {
+		StringName spread;
+		StringName flatness;
+		StringName initial_linear_velocity;
+		StringName initial_angle;
+		StringName angular_velocity;
+		StringName orbit_velocity;
+		StringName linear_accel;
+		StringName radial_accel;
+		StringName tangent_accel;
+		StringName damping;
+		StringName scale;
+		StringName hue_variation;
+		StringName anim_speed;
+		StringName anim_offset;
+
+		StringName initial_linear_velocity_random;
+		StringName initial_angle_random;
+		StringName angular_velocity_random;
+		StringName orbit_velocity_random;
+		StringName linear_accel_random;
+		StringName radial_accel_random;
+		StringName tangent_accel_random;
+		StringName damping_random;
+		StringName scale_random;
+		StringName hue_variation_random;
+		StringName anim_speed_random;
+		StringName anim_offset_random;
+
+		StringName angle_texture;
+		StringName angular_velocity_texture;
+		StringName orbit_velocity_texture;
+		StringName linear_accel_texture;
+		StringName radial_accel_texture;
+		StringName tangent_accel_texture;
+		StringName damping_texture;
+		StringName scale_texture;
+		StringName hue_variation_texture;
+		StringName anim_speed_texture;
+		StringName anim_offset_texture;
+
+		StringName color;
+		StringName color_ramp;
+
+		StringName emission_sphere_radius;
+		StringName emission_box_extents;
+		StringName emission_texture_point_count;
+		StringName emission_texture_points;
+		StringName emission_texture_normal;
+		StringName emission_texture_color;
+
+		StringName trail_divisor;
+		StringName trail_size_modifier;
+		StringName trail_color_modifier;
+
+		StringName gravity;
+	};
+
+	static ShaderNames *shader_names;
+
+	SelfList<ParticlesMaterial> element;
+
+	void _update_shader();
+	_FORCE_INLINE_ void _queue_shader_change();
+	_FORCE_INLINE_ bool _is_shader_dirty() const;
+
+	float spread;
+	float flatness;
+
+	float parameters[PARAM_MAX];
+	float randomness[PARAM_MAX];
+
+	Ref<Texture> tex_parameters[PARAM_MAX];
+	Color color;
+	Ref<Texture> color_ramp;
+
+	bool flags[FLAG_MAX];
+
+	EmissionShape emission_shape;
+	float emission_sphere_radius;
+	Vector3 emission_box_extents;
+	Ref<Texture> emission_point_texture;
+	Ref<Texture> emission_normal_texture;
+	Ref<Texture> emission_color_texture;
+	int emission_point_count;
+
+	bool anim_loop;
+
+	int trail_divisor;
+
+	Ref<CurveTexture> trail_size_modifier;
+	Ref<GradientTexture> trail_color_modifier;
+
+	Vector3 gravity;
+
+	//do not save emission points here
+
+protected:
+	static void _bind_methods();
+	virtual void _validate_property(PropertyInfo &property) const;
+
+public:
+	void set_spread(float p_spread);
+	float get_spread() const;
+
+	void set_flatness(float p_flatness);
+	float get_flatness() const;
+
+	void set_param(Parameter p_param, float p_value);
+	float get_param(Parameter p_param) const;
+
+	void set_param_randomness(Parameter p_param, float p_value);
+	float get_param_randomness(Parameter p_param) const;
+
+	void set_param_texture(Parameter p_param, const Ref<Texture> &p_texture);
+	Ref<Texture> get_param_texture(Parameter p_param) const;
+
+	void set_color(const Color &p_color);
+	Color get_color() const;
+
+	void set_color_ramp(const Ref<Texture> &p_texture);
+	Ref<Texture> get_color_ramp() const;
+
+	void set_flag(Flags p_flag, bool p_enable);
+	bool get_flag(Flags p_flag) const;
+
+	void set_emission_shape(EmissionShape p_shape);
+	void set_emission_sphere_radius(float p_radius);
+	void set_emission_box_extents(Vector3 p_extents);
+	void set_emission_point_texture(const Ref<Texture> &p_points);
+	void set_emission_normal_texture(const Ref<Texture> &p_normals);
+	void set_emission_color_texture(const Ref<Texture> &p_colors);
+	void set_emission_point_count(int p_count);
+
+	EmissionShape get_emission_shape() const;
+	float get_emission_sphere_radius() const;
+	Vector3 get_emission_box_extents() const;
+	Ref<Texture> get_emission_point_texture() const;
+	Ref<Texture> get_emission_normal_texture() const;
+	Ref<Texture> get_emission_color_texture() const;
+	int get_emission_point_count() const;
+
+	void set_trail_divisor(int p_divisor);
+	int get_trail_divisor() const;
+
+	void set_trail_size_modifier(const Ref<CurveTexture> &p_trail_size_modifier);
+	Ref<CurveTexture> get_trail_size_modifier() const;
+
+	void set_trail_color_modifier(const Ref<GradientTexture> &p_trail_color_modifier);
+	Ref<GradientTexture> get_trail_color_modifier() const;
+
+	void set_gravity(const Vector3 &p_gravity);
+	Vector3 get_gravity() const;
+
+	static void init_shaders();
+	static void finish_shaders();
+	static void flush_changes();
+
+	RID get_shader_rid() const;
+
+	virtual Shader::Mode get_shader_mode() const;
+
+	ParticlesMaterial();
+	~ParticlesMaterial();
+};
+
+VARIANT_ENUM_CAST(ParticlesMaterial::Parameter)
+VARIANT_ENUM_CAST(ParticlesMaterial::Flags)
+VARIANT_ENUM_CAST(ParticlesMaterial::EmissionShape)
+
+#endif // PARTICLES_MATERIAL_H