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particle_process_material.cpp
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particle_process_material.cpp
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/**************************************************************************/
/* particle_process_material.cpp */
/**************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
/* */
/* 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 "particle_process_material.h"
#include "core/version.h"
Mutex ParticleProcessMaterial::material_mutex;
SelfList<ParticleProcessMaterial>::List ParticleProcessMaterial::dirty_materials;
HashMap<ParticleProcessMaterial::MaterialKey, ParticleProcessMaterial::ShaderData, ParticleProcessMaterial::MaterialKey> ParticleProcessMaterial::shader_map;
RBSet<String> ParticleProcessMaterial::min_max_properties;
ParticleProcessMaterial::ShaderNames *ParticleProcessMaterial::shader_names = nullptr;
void ParticleProcessMaterial::init_shaders() {
shader_names = memnew(ShaderNames);
shader_names->direction = "direction";
shader_names->spread = "spread";
shader_names->flatness = "flatness";
shader_names->initial_linear_velocity_min = "initial_linear_velocity_min";
shader_names->initial_angle_min = "initial_angle_min";
shader_names->angular_velocity_min = "angular_velocity_min";
shader_names->orbit_velocity_min = "orbit_velocity_min";
shader_names->radial_velocity_min = "radial_velocity_min";
shader_names->linear_accel_min = "linear_accel_min";
shader_names->radial_accel_min = "radial_accel_min";
shader_names->tangent_accel_min = "tangent_accel_min";
shader_names->damping_min = "damping_min";
shader_names->scale_min = "scale_min";
shader_names->hue_variation_min = "hue_variation_min";
shader_names->anim_speed_min = "anim_speed_min";
shader_names->anim_offset_min = "anim_offset_min";
shader_names->directional_velocity_min = "directional_velocity_min";
shader_names->scale_over_velocity_min = "scale_over_velocity_min";
shader_names->initial_linear_velocity_max = "initial_linear_velocity_max";
shader_names->initial_angle_max = "initial_angle_max";
shader_names->angular_velocity_max = "angular_velocity_max";
shader_names->orbit_velocity_max = "orbit_velocity_max";
shader_names->radial_velocity_max = "radial_velocity_max";
shader_names->linear_accel_max = "linear_accel_max";
shader_names->radial_accel_max = "radial_accel_max";
shader_names->tangent_accel_max = "tangent_accel_max";
shader_names->damping_max = "damping_max";
shader_names->scale_max = "scale_max";
shader_names->hue_variation_max = "hue_variation_max";
shader_names->anim_speed_max = "anim_speed_max";
shader_names->anim_offset_max = "anim_offset_max";
shader_names->directional_velocity_max = "directional_velocity_max";
shader_names->scale_over_velocity_max = "scale_over_velocity_max";
shader_names->angle_texture = "angle_texture";
shader_names->angular_velocity_texture = "angular_velocity_texture";
shader_names->orbit_velocity_texture = "orbit_velocity_curve";
shader_names->radial_velocity_texture = "radial_velocity_curve";
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_curve";
shader_names->hue_variation_texture = "hue_rot_curve";
shader_names->anim_speed_texture = "animation_speed_curve";
shader_names->anim_offset_texture = "animation_offset_curve";
shader_names->directional_velocity_texture = "directional_velocity_curve";
shader_names->scale_over_velocity_texture = "scale_over_velocity_curve";
shader_names->color = "color_value";
shader_names->color_ramp = "color_ramp";
shader_names->alpha_ramp = "alpha_curve";
shader_names->emission_ramp = "emission_curve";
shader_names->color_initial_ramp = "color_initial_ramp";
shader_names->velocity_limit_curve = "velocity_limit_curve";
shader_names->inherit_emitter_velocity_ratio = "inherit_emitter_velocity_ratio";
shader_names->velocity_pivot = "velocity_pivot";
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->emission_ring_axis = "emission_ring_axis";
shader_names->emission_ring_height = "emission_ring_height";
shader_names->emission_ring_radius = "emission_ring_radius";
shader_names->emission_ring_inner_radius = "emission_ring_inner_radius";
shader_names->emission_ring_cone_angle = "emission_ring_cone_angle";
shader_names->emission_shape_offset = "emission_shape_offset";
shader_names->emission_shape_scale = "emission_shape_scale";
shader_names->turbulence_enabled = "turbulence_enabled";
shader_names->turbulence_noise_strength = "turbulence_noise_strength";
shader_names->turbulence_noise_scale = "turbulence_noise_scale";
shader_names->turbulence_noise_speed = "turbulence_noise_speed";
shader_names->turbulence_noise_speed_random = "turbulence_noise_speed_random";
shader_names->turbulence_influence_over_life = "turbulence_influence_over_life";
shader_names->turbulence_influence_min = "turbulence_influence_min";
shader_names->turbulence_influence_max = "turbulence_influence_max";
shader_names->turbulence_initial_displacement_min = "turbulence_initial_displacement_min";
shader_names->turbulence_initial_displacement_max = "turbulence_initial_displacement_max";
shader_names->gravity = "gravity";
shader_names->lifetime_randomness = "lifetime_randomness";
shader_names->sub_emitter_frequency = "sub_emitter_frequency";
shader_names->sub_emitter_amount_at_end = "sub_emitter_amount_at_end";
shader_names->sub_emitter_amount_at_collision = "sub_emitter_amount_at_collision";
shader_names->sub_emitter_keep_velocity = "sub_emitter_keep_velocity";
shader_names->collision_friction = "collision_friction";
shader_names->collision_bounce = "collision_bounce";
}
void ParticleProcessMaterial::finish_shaders() {
dirty_materials.clear();
memdelete(shader_names);
shader_names = nullptr;
}
void ParticleProcessMaterial::_update_shader() {
MaterialKey mk = _compute_key();
if (mk == current_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.
RS::get_singleton()->free(shader_map[current_key].shader);
shader_map.erase(current_key);
}
}
current_key = mk;
if (shader_map.has(mk)) {
RS::get_singleton()->material_set_shader(_get_material(), shader_map[mk].shader);
shader_map[mk].users++;
return;
}
// No pre-existing shader, create one.
// Add a comment to describe the shader origin (useful when converting to ShaderMaterial).
String code = "// NOTE: Shader automatically converted from " VERSION_NAME " " VERSION_FULL_CONFIG "'s ParticleProcessMaterial.\n\n";
code += "shader_type particles;\n";
code += "render_mode disable_velocity;\n";
if (collision_scale) {
code += "render_mode collision_use_scale;\n";
}
code += "\n";
// Define uniforms.
code += "uniform vec3 direction;\n";
code += "uniform float spread;\n";
code += "uniform float flatness;\n";
code += "uniform float inherit_emitter_velocity_ratio = 0.0;\n";
code += "uniform float initial_linear_velocity_min;\n";
code += "uniform float initial_linear_velocity_max;\n";
code += "uniform float directional_velocity_min;\n";
code += "uniform float directional_velocity_max;\n";
code += "uniform float angular_velocity_min;\n";
code += "uniform float angular_velocity_max;\n";
code += "uniform float orbit_velocity_min;\n";
code += "uniform float orbit_velocity_max;\n";
code += "uniform float radial_velocity_min;\n";
code += "uniform float radial_velocity_max;\n";
code += "uniform float linear_accel_min;\n";
code += "uniform float linear_accel_max;\n";
code += "uniform float radial_accel_min;\n";
code += "uniform float radial_accel_max;\n";
code += "uniform float tangent_accel_min;\n";
code += "uniform float tangent_accel_max;\n";
code += "uniform float damping_min;\n";
code += "uniform float damping_max;\n";
code += "uniform float initial_angle_min;\n";
code += "uniform float initial_angle_max;\n";
code += "uniform float scale_min;\n";
code += "uniform float scale_max;\n";
code += "uniform float hue_variation_min;\n";
code += "uniform float hue_variation_max;\n";
code += "uniform float anim_speed_min;\n";
code += "uniform float anim_speed_max;\n";
code += "uniform float anim_offset_min;\n";
code += "uniform float anim_offset_max;\n";
code += "uniform float lifetime_randomness;\n";
code += "uniform vec3 emission_shape_offset = vec3(0.0);\n";
code += "uniform vec3 emission_shape_scale = vec3(1.0);\n";
code += "uniform vec3 velocity_pivot = vec3(0.0);\n";
if (tex_parameters[PARAM_SCALE_OVER_VELOCITY].is_valid()) {
code += "uniform float scale_over_velocity_min = 0.0;\n";
code += "uniform float scale_over_velocity_max = 5.0;\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_SPHERE_SURFACE: {
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_default_black;\n";
[[fallthrough]];
}
case EMISSION_SHAPE_POINTS: {
code += "uniform sampler2D emission_texture_points : hint_default_black;\n";
code += "uniform int emission_texture_point_count;\n";
if (emission_color_texture.is_valid()) {
code += "uniform sampler2D emission_texture_color : hint_default_white;\n";
}
} break;
case EMISSION_SHAPE_RING: {
code += "uniform vec3 " + shader_names->emission_ring_axis + ";\n";
code += "uniform float " + shader_names->emission_ring_height + ";\n";
code += "uniform float " + shader_names->emission_ring_radius + ";\n";
code += "uniform float " + shader_names->emission_ring_inner_radius + ";\n";
code += "uniform float " + shader_names->emission_ring_cone_angle + ";\n";
} break;
case EMISSION_SHAPE_MAX: { // Max value for validity check.
break;
}
}
if (sub_emitter_mode != SUB_EMITTER_DISABLED && !RenderingServer::get_singleton()->is_low_end()) {
if (sub_emitter_mode == SUB_EMITTER_CONSTANT) {
code += "uniform float sub_emitter_frequency;\n";
}
if (sub_emitter_mode == SUB_EMITTER_AT_END) {
code += "uniform int sub_emitter_amount_at_end;\n";
}
if (sub_emitter_mode == SUB_EMITTER_AT_COLLISION) {
code += "uniform int sub_emitter_amount_at_collision;\n";
}
code += "uniform bool sub_emitter_keep_velocity;\n";
}
code += "uniform vec4 color_value : source_color;\n";
code += "uniform vec3 gravity;\n";
if (color_ramp.is_valid()) {
code += "uniform sampler2D color_ramp : repeat_disable;\n";
}
if (color_initial_ramp.is_valid()) {
code += "uniform sampler2D color_initial_ramp : repeat_disable;\n";
}
if (alpha_curve.is_valid()) {
code += "uniform sampler2D alpha_curve : repeat_disable;\n";
}
if (emission_curve.is_valid()) {
code += "uniform sampler2D emission_curve : repeat_disable;\n";
}
if (tex_parameters[PARAM_INITIAL_LINEAR_VELOCITY].is_valid()) {
code += "uniform sampler2D linear_velocity_texture : repeat_disable;\n";
}
if (tex_parameters[PARAM_ORBIT_VELOCITY].is_valid()) {
code += "uniform sampler2D orbit_velocity_curve : repeat_disable;\n";
}
if (tex_parameters[PARAM_ANGULAR_VELOCITY].is_valid()) {
code += "uniform sampler2D angular_velocity_texture : repeat_disable;\n";
}
if (tex_parameters[PARAM_LINEAR_ACCEL].is_valid()) {
code += "uniform sampler2D linear_accel_texture : repeat_disable;\n";
}
if (tex_parameters[PARAM_RADIAL_ACCEL].is_valid()) {
code += "uniform sampler2D radial_accel_texture : repeat_disable;\n";
}
if (tex_parameters[PARAM_TANGENTIAL_ACCEL].is_valid()) {
code += "uniform sampler2D tangent_accel_texture : repeat_disable;\n";
}
if (tex_parameters[PARAM_DAMPING].is_valid()) {
code += "uniform sampler2D damping_texture : repeat_disable;\n";
}
if (tex_parameters[PARAM_ANGLE].is_valid()) {
code += "uniform sampler2D angle_texture : repeat_disable;\n";
}
if (tex_parameters[PARAM_SCALE].is_valid()) {
code += "uniform sampler2D scale_curve : repeat_disable;\n";
}
if (tex_parameters[PARAM_HUE_VARIATION].is_valid()) {
code += "uniform sampler2D hue_rot_curve : repeat_disable;\n";
}
if (tex_parameters[PARAM_ANIM_SPEED].is_valid()) {
code += "uniform sampler2D animation_speed_curve : repeat_disable;\n";
}
if (tex_parameters[PARAM_ANIM_OFFSET].is_valid()) {
code += "uniform sampler2D animation_offset_curve : repeat_disable;\n";
}
if (tex_parameters[PARAM_RADIAL_VELOCITY].is_valid()) {
code += "uniform sampler2D radial_velocity_curve : repeat_disable;\n";
}
if (tex_parameters[PARAM_SCALE_OVER_VELOCITY].is_valid()) {
code += "uniform sampler2D scale_over_velocity_curve : repeat_disable;\n";
}
if (tex_parameters[PARAM_DIRECTIONAL_VELOCITY].is_valid()) {
code += "uniform sampler2D directional_velocity_curve : repeat_disable;\n";
}
if (velocity_limit_curve.is_valid()) {
code += "uniform sampler2D velocity_limit_curve : repeat_disable;\n";
}
if (collision_mode == COLLISION_RIGID) {
code += "uniform float collision_friction;\n";
code += "uniform float collision_bounce;\n";
}
if (turbulence_enabled) {
code += "uniform float turbulence_noise_strength;\n";
code += "uniform float turbulence_noise_scale;\n";
code += "uniform float turbulence_influence_min;\n";
code += "uniform float turbulence_influence_max;\n";
code += "uniform float turbulence_initial_displacement_min;\n";
code += "uniform float turbulence_initial_displacement_max;\n";
code += "uniform float turbulence_noise_speed_random;\n";
code += "uniform vec3 turbulence_noise_speed = vec3(1.0, 1.0, 1.0);\n";
if (tex_parameters[PARAM_TURB_INFLUENCE_OVER_LIFE].is_valid()) {
code += "uniform sampler2D turbulence_influence_over_life;\n";
}
if (turbulence_color_ramp.is_valid()) {
code += "uniform sampler2D turbulence_color_ramp;\n";
}
}
code += "\n";
// Define helper functions.
if (turbulence_enabled) {
// Functions for 3D noise / turbulence.
code += "// Functions for 3D noise / turbulence.\n";
code += "vec4 grad(vec4 p) {\n";
code += " p = fract(vec4(\n";
code += " dot(p, vec4(0.143081, 0.001724, 0.280166, 0.262771)),\n";
code += " dot(p, vec4(0.645401, -0.047791, -0.146698, 0.595016)),\n";
code += " dot(p, vec4(-0.499665, -0.095734, 0.425674, -0.207367)),\n";
code += " dot(p, vec4(-0.013596, -0.848588, 0.423736, 0.17044))));\n";
code += " return fract((p.xyzw * p.yzwx) * 2365.952041) * 2.0 - 1.0;\n";
code += "}\n\n";
code += "float noise(vec4 coord) {\n";
code += " // Domain rotation to improve the look of XYZ slices + animation patterns.\n";
code += " coord = vec4(\n";
code += " coord.xyz + dot(coord, vec4(vec3(-0.1666667), -0.5)),\n";
code += " dot(coord, vec4(0.5)));\n\n";
code += " vec4 base = floor(coord), delta = coord - base;\n\n";
code += " vec4 grad_0000 = grad(base + vec4(0.0, 0.0, 0.0, 0.0)), grad_1000 = grad(base + vec4(1.0, 0.0, 0.0, 0.0));\n";
code += " vec4 grad_0100 = grad(base + vec4(0.0, 1.0, 0.0, 0.0)), grad_1100 = grad(base + vec4(1.0, 1.0, 0.0, 0.0));\n";
code += " vec4 grad_0010 = grad(base + vec4(0.0, 0.0, 1.0, 0.0)), grad_1010 = grad(base + vec4(1.0, 0.0, 1.0, 0.0));\n";
code += " vec4 grad_0110 = grad(base + vec4(0.0, 1.0, 1.0, 0.0)), grad_1110 = grad(base + vec4(1.0, 1.0, 1.0, 0.0));\n";
code += " vec4 grad_0001 = grad(base + vec4(0.0, 0.0, 0.0, 1.0)), grad_1001 = grad(base + vec4(1.0, 0.0, 0.0, 1.0));\n";
code += " vec4 grad_0101 = grad(base + vec4(0.0, 1.0, 0.0, 1.0)), grad_1101 = grad(base + vec4(1.0, 1.0, 0.0, 1.0));\n";
code += " vec4 grad_0011 = grad(base + vec4(0.0, 0.0, 1.0, 1.0)), grad_1011 = grad(base + vec4(1.0, 0.0, 1.0, 1.0));\n";
code += " vec4 grad_0111 = grad(base + vec4(0.0, 1.0, 1.0, 1.0)), grad_1111 = grad(base + vec4(1.0, 1.0, 1.0, 1.0));\n\n";
code += " vec4 result_0123 = vec4(\n";
code += " dot(delta - vec4(0.0, 0.0, 0.0, 0.0), grad_0000), dot(delta - vec4(1.0, 0.0, 0.0, 0.0), grad_1000),\n";
code += " dot(delta - vec4(0.0, 1.0, 0.0, 0.0), grad_0100), dot(delta - vec4(1.0, 1.0, 0.0, 0.0), grad_1100));\n";
code += " vec4 result_4567 = vec4(\n";
code += " dot(delta - vec4(0.0, 0.0, 1.0, 0.0), grad_0010), dot(delta - vec4(1.0, 0.0, 1.0, 0.0), grad_1010),\n";
code += " dot(delta - vec4(0.0, 1.0, 1.0, 0.0), grad_0110), dot(delta - vec4(1.0, 1.0, 1.0, 0.0), grad_1110));\n";
code += " vec4 result_89AB = vec4(\n";
code += " dot(delta - vec4(0.0, 0.0, 0.0, 1.0), grad_0001), dot(delta - vec4(1.0, 0.0, 0.0, 1.0), grad_1001),\n";
code += " dot(delta - vec4(0.0, 1.0, 0.0, 1.0), grad_0101), dot(delta - vec4(1.0, 1.0, 0.0, 1.0), grad_1101));\n";
code += " vec4 result_CDEF = vec4(\n";
code += " dot(delta - vec4(0.0, 0.0, 1.0, 1.0), grad_0011), dot(delta - vec4(1.0, 0.0, 1.0, 1.0), grad_1011),\n";
code += " dot(delta - vec4(0.0, 1.0, 1.0, 1.0), grad_0111), dot(delta - vec4(1.0, 1.0, 1.0, 1.0), grad_1111));\n\n";
code += " vec4 fade = delta * delta * delta * (10.0 + delta * (-15.0 + delta * 6.0));\n";
code += " vec4 result_W0 = mix(result_0123, result_89AB, fade.w), result_W1 = mix(result_4567, result_CDEF, fade.w);\n";
code += " vec4 result_WZ = mix(result_W0, result_W1, fade.z);\n";
code += " vec2 result_WZY = mix(result_WZ.xy, result_WZ.zw, fade.y);\n";
code += " return mix(result_WZY.x, result_WZY.y, fade.x);\n";
code += "}\n\n";
code += "// Curl 3D and three-noise function with friendly permission by Isaac Cohen.\n";
code += "// Modified to accept 4D noise.\n";
code += "vec3 noise_3x(vec4 p) {\n";
code += " float s = noise(p);\n";
code += " float s1 = noise(p + vec4(vec3(0.0), 1.7320508 * 2048.333333));\n";
code += " float s2 = noise(p - vec4(vec3(0.0), 1.7320508 * 2048.333333));\n";
code += " vec3 c = vec3(s, s1, s2);\n";
code += " return c;\n";
code += "}\n\n";
code += "vec3 curl_3d(vec4 p, float c) {\n";
code += " float epsilon = 0.001 + c;\n";
code += " vec4 dx = vec4(epsilon, 0.0, 0.0, 0.0);\n";
code += " vec4 dy = vec4(0.0, epsilon, 0.0, 0.0);\n";
code += " vec4 dz = vec4(0.0, 0.0, epsilon, 0.0);\n";
code += " vec3 x0 = noise_3x(p - dx).xyz;\n";
code += " vec3 x1 = noise_3x(p + dx).xyz;\n";
code += " vec3 y0 = noise_3x(p - dy).xyz;\n";
code += " vec3 y1 = noise_3x(p + dy).xyz;\n";
code += " vec3 z0 = noise_3x(p - dz).xyz;\n";
code += " vec3 z1 = noise_3x(p + dz).xyz;\n";
code += " float x = (y1.z - y0.z) - (z1.y - z0.y);\n";
code += " float y = (z1.x - z0.x) - (x1.z - x0.z);\n";
code += " float z = (x1.y - x0.y) - (y1.x - y0.x);\n";
code += " return normalize(vec3(x, y, z));\n";
code += "}\n\n";
code += "vec3 get_noise_direction(vec3 pos) {\n";
code += " float adj_contrast = max((turbulence_noise_strength - 1.0), 0.0) * 70.0;\n";
code += " vec4 noise_time = TIME * vec4(turbulence_noise_speed, turbulence_noise_speed_random);\n";
code += " vec4 noise_pos = vec4(pos * turbulence_noise_scale, 0.0);\n";
code += " vec3 noise_direction = curl_3d(noise_pos + noise_time, adj_contrast);\n";
code += " noise_direction = mix(0.9 * noise_direction, noise_direction, turbulence_noise_strength - 9.0);\n";
code += " return noise_direction;\n";
code += "}\n\n";
}
code += "vec4 rotate_hue(vec4 current_color, float hue_rot_angle) {\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 =\n";
code += " 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)) *\n";
code += " 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)) *\n";
code += " hue_rot_s;\n";
code += " return hue_rot_mat * current_color;\n";
code += "}\n\n";
// Random functions.
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 += " }\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 += " }\n";
code += " seed = uint(s);\n";
code += " return float(seed % uint(65536)) / 65535.0;\n";
code += "}\n\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\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\n";
// Define structs.
code += "struct DisplayParameters {\n";
code += " vec3 scale;\n";
code += " float hue_rotation;\n";
code += " float animation_speed;\n";
code += " float animation_offset;\n";
code += " float lifetime;\n";
code += " vec4 color;\n";
code += "};\n\n";
code += "struct DynamicsParameters {\n";
code += " float angle;\n";
code += " float angular_velocity;\n";
code += " float initial_velocity_multiplier;\n";
code += " float directional_velocity;\n";
code += " float radial_velocity;\n";
code += " float orbit_velocity;\n";
if (turbulence_enabled) {
code += " float turb_influence;\n";
}
code += "};\n\n";
code += "struct PhysicalParameters {\n";
code += " float linear_accel;\n";
code += " float radial_accel;\n";
code += " float tangent_accel;\n";
code += " float damping;\n";
code += "};\n\n";
code += "void calculate_initial_physical_params(inout PhysicalParameters params, inout uint alt_seed) {\n";
code += " params.linear_accel = mix(linear_accel_min, linear_accel_max, rand_from_seed(alt_seed));\n";
code += " params.radial_accel = mix(radial_accel_min, radial_accel_max, rand_from_seed(alt_seed));\n";
code += " params.tangent_accel = mix(tangent_accel_min, tangent_accel_max, rand_from_seed(alt_seed));\n";
code += " params.damping = mix(damping_min, damping_max, rand_from_seed(alt_seed));\n";
code += "}\n\n";
code += "void calculate_initial_dynamics_params(inout DynamicsParameters params, inout uint alt_seed) {\n";
code += " // -------------------- DO NOT REORDER OPERATIONS, IT BREAKS VISUAL COMPATIBILITY\n";
code += " // -------------------- ADD NEW OPERATIONS AT THE BOTTOM\n";
code += " params.angle = mix(initial_angle_min, initial_angle_max, rand_from_seed(alt_seed));\n";
code += " params.angular_velocity = mix(angular_velocity_min, angular_velocity_max, rand_from_seed(alt_seed));\n";
code += " params.initial_velocity_multiplier = mix(initial_linear_velocity_min, initial_linear_velocity_max, rand_from_seed(alt_seed));\n";
code += " params.directional_velocity = mix(directional_velocity_min, directional_velocity_max, rand_from_seed(alt_seed));\n";
code += " params.radial_velocity = mix(radial_velocity_min, radial_velocity_max, rand_from_seed(alt_seed));\n";
code += " params.orbit_velocity = mix(orbit_velocity_min, orbit_velocity_max, rand_from_seed(alt_seed));\n";
if (turbulence_enabled) {
code += " params.turb_influence = mix(turbulence_influence_min, turbulence_influence_max, rand_from_seed(alt_seed));\n";
}
code += "}\n\n";
code += "void calculate_initial_display_params(inout DisplayParameters params, inout uint alt_seed) {\n";
code += " // -------------------- DO NOT REORDER OPERATIONS, IT BREAKS VISUAL COMPATIBILITY\n";
code += " // -------------------- ADD NEW OPERATIONS AT THE BOTTOM\n";
code += " float pi = 3.14159;\n";
code += " params.scale = vec3(mix(scale_min, scale_max, rand_from_seed(alt_seed)));\n";
code += " params.scale = sign(params.scale) * max(abs(params.scale), 0.001);\n";
code += " params.hue_rotation = pi * 2.0 * mix(hue_variation_min, hue_variation_max, rand_from_seed(alt_seed));\n";
code += " params.animation_speed = mix(anim_speed_min, anim_speed_max, rand_from_seed(alt_seed));\n";
code += " params.animation_offset = mix(anim_offset_min, anim_offset_max, rand_from_seed(alt_seed));\n";
code += " params.lifetime = (1.0 - lifetime_randomness * rand_from_seed(alt_seed));\n";
code += " params.color = color_value;\n";
if (color_initial_ramp.is_valid()) {
code += " params.color *= texture(color_initial_ramp, vec2(rand_from_seed(alt_seed)));\n";
}
if (emission_color_texture.is_valid() && (emission_shape == EMISSION_SHAPE_POINTS || emission_shape == EMISSION_SHAPE_DIRECTED_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 += " params.color *= texelFetch(emission_texture_color, emission_tex_ofs, 0);\n";
}
code += "}\n\n";
// Process display parameters that are bound solely by lifetime.
code += "void process_display_param(inout DisplayParameters parameters, float lifetime) {\n";
code += " // Compile-time add textures.\n";
if (tex_parameters[PARAM_SCALE].is_valid()) {
code += " parameters.scale *= texture(scale_curve, vec2(lifetime)).rgb;\n";
}
if (tex_parameters[PARAM_HUE_VARIATION].is_valid()) {
code += " parameters.hue_rotation *= texture(hue_rot_curve, vec2(lifetime)).r;\n";
}
if (tex_parameters[PARAM_ANIM_OFFSET].is_valid()) {
code += " parameters.animation_offset += texture(animation_offset_curve, vec2(lifetime)).r;\n";
}
if (tex_parameters[PARAM_ANIM_SPEED].is_valid()) {
code += " parameters.animation_speed *= texture(animation_speed_curve, vec2(lifetime)).r;\n";
}
if (color_ramp.is_valid()) {
code += " parameters.color *= texture(color_ramp, vec2(lifetime));\n";
}
if (alpha_curve.is_valid()) {
code += " parameters.color.a *= texture(alpha_curve, vec2(lifetime)).r;\n";
}
code += " parameters.color = rotate_hue(parameters.color, parameters.hue_rotation);\n";
if (emission_curve.is_valid()) {
code += " parameters.color.rgb *= 1.0 + texture(emission_curve, vec2(lifetime)).r;\n";
}
code += "}\n\n";
code += "vec3 calculate_initial_position(inout uint alt_seed) {\n";
code += " float pi = 3.14159;\n";
code += " vec3 pos = vec3(0.0);\n";
code += " { // Emission shape.\n";
if (emission_shape == EMISSION_SHAPE_POINT) {
code += " pos = vec3(0.0);\n";
}
if (emission_shape == EMISSION_SHAPE_SPHERE) {
code += " float s = rand_from_seed(alt_seed) * 2.0 - 1.0;\n";
code += " float t = rand_from_seed(alt_seed) * 2.0 * pi;\n";
code += " float p = rand_from_seed(alt_seed);\n";
code += " float radius = emission_sphere_radius * sqrt(1.0 - s * s);\n";
code += " pos = mix(vec3(0.0, 0.0, 0.0), vec3(radius * cos(t), radius * sin(t), emission_sphere_radius * s), p);\n";
}
if (emission_shape == EMISSION_SHAPE_SPHERE_SURFACE) {
code += " float s = rand_from_seed(alt_seed) * 2.0 - 1.0;\n";
code += " float t = rand_from_seed(alt_seed) * 2.0 * pi;\n";
code += " float radius = emission_sphere_radius * sqrt(1.0 - s * s);\n";
code += " pos = vec3(radius * cos(t), radius * sin(t), emission_sphere_radius * s);\n";
}
if (emission_shape == EMISSION_SHAPE_BOX) {
code += " pos = 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";
}
if (emission_shape == EMISSION_SHAPE_POINTS || emission_shape == EMISSION_SHAPE_DIRECTED_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 += " pos = texelFetch(emission_texture_points, emission_tex_ofs, 0).xyz;\n";
}
if (emission_shape == EMISSION_SHAPE_RING) {
code += " float radius_clamped = max(0.001, emission_ring_radius);\n";
code += " float top_radius = max(radius_clamped - tan(radians(90.0 - emission_ring_cone_angle)) * emission_ring_height, 0.0);\n";
code += " float y_pos = rand_from_seed(alt_seed);\n";
code += " float skew = max(min(radius_clamped, top_radius) / max(radius_clamped, top_radius), 0.5);\n";
code += " y_pos = radius_clamped < top_radius ? pow(y_pos, skew) : 1.0 - pow(y_pos, skew);\n";
code += " float ring_spawn_angle = rand_from_seed(alt_seed) * 2.0 * pi;\n";
code += " float ring_random_radius = sqrt(rand_from_seed(alt_seed) * (radius_clamped * radius_clamped - emission_ring_inner_radius * emission_ring_inner_radius) + emission_ring_inner_radius * emission_ring_inner_radius);\n";
code += " ring_random_radius = mix(ring_random_radius, ring_random_radius * (top_radius / radius_clamped), y_pos);\n";
code += " vec3 axis = emission_ring_axis == vec3(0.0) ? vec3(0.0, 0.0, 1.0) : normalize(emission_ring_axis);\n";
code += " vec3 ortho_axis = vec3(0.0);\n";
code += " if (abs(axis) == vec3(1.0, 0.0, 0.0)) {\n";
code += " ortho_axis = cross(axis, vec3(0.0, 1.0, 0.0));\n";
code += " } else {\n";
code += " ortho_axis = cross(axis, vec3(1.0, 0.0, 0.0));\n";
code += " }\n";
code += " ortho_axis = normalize(ortho_axis);\n";
code += " float s = sin(ring_spawn_angle);\n";
code += " float c = cos(ring_spawn_angle);\n";
code += " float oc = 1.0 - c;\n";
code += " ortho_axis = mat3(\n";
code += " vec3(c + axis.x * axis.x * oc, axis.x * axis.y * oc - axis.z * s, axis.x * axis.z *oc + axis.y * s),\n";
code += " vec3(axis.x * axis.y * oc + s * axis.z, c + axis.y * axis.y * oc, axis.y * axis.z * oc - axis.x * s),\n";
code += " vec3(axis.z * axis.x * oc - axis.y * s, axis.z * axis.y * oc + axis.x * s, c + axis.z * axis.z * oc)\n";
code += " ) * ortho_axis;\n";
code += " ortho_axis = normalize(ortho_axis);\n";
code += " pos = ortho_axis * ring_random_radius + (y_pos * emission_ring_height - emission_ring_height / 2.0) * axis;\n";
}
code += " }\n";
code += " return pos * emission_shape_scale + emission_shape_offset;\n";
code += "}\n\n";
if (tex_parameters[PARAM_ORBIT_VELOCITY].is_valid() || particle_flags[PARTICLE_FLAG_DISABLE_Z]) {
code += "vec3 process_orbit_displacement(DynamicsParameters param, float lifetime, inout uint alt_seed, mat4 transform, mat4 emission_transform, float delta, float total_lifetime) {\n";
// No reason to run all these expensive calculation below if we have no orbit velocity
// HOWEVER
// May be a bad idea for fps consistency?
code += " if (abs(param.orbit_velocity) < 0.01 || delta < 0.001) {\n";
code += " return vec3(0.0);\n";
code += " }\n";
code += " vec3 displacement = vec3(0.0);\n";
code += " float pi = 3.14159;\n";
if (particle_flags[PARTICLE_FLAG_DISABLE_Z]) {
code += " float orbit_amount = param.orbit_velocity;\n";
if (tex_parameters[PARAM_ORBIT_VELOCITY].is_valid()) {
CurveTexture *texture = Object::cast_to<CurveTexture>(tex_parameters[PARAM_ORBIT_VELOCITY].ptr());
if (texture) {
code += " orbit_amount *= texture(orbit_velocity_curve, vec2(lifetime)).r;\n";
} else {
code += " orbit_amount *= texture(orbit_velocity_curve, vec2(lifetime)).b;\n";
}
}
code += " if (orbit_amount != 0.0) {\n";
code += " vec3 pos = transform[3].xyz;\n";
code += " vec3 org = emission_transform[3].xyz;\n";
code += " vec3 diff = pos - org;\n";
code += " float ang = orbit_amount * pi * 2.0 * delta;\n";
code += " mat2 rot = mat2(vec2(cos(ang), -sin(ang)), vec2(sin(ang), cos(ang)));\n";
code += " displacement.xy -= diff.xy;\n";
code += " displacement.xy += rot * diff.xy;\n";
code += " }\n";
} else {
code += " vec3 orbit_velocities = vec3(param.orbit_velocity);\n";
code += " orbit_velocities *= texture(orbit_velocity_curve, vec2(lifetime)).rgb;\n";
code += " orbit_velocities *= pi * 2.0;\n";
code += " orbit_velocities *= delta; // We wanna process those by the delta angle.\n\n";
code += " // X axis.\n";
code += " vec3 local_pos = (inverse(emission_transform) * transform[3]).xyz;\n";
code += " local_pos -= velocity_pivot;\n";
code += " local_pos.x = 0.0;\n";
code += " mat3 x_rotation_mat = mat3(\n";
code += " vec3(1.0, 0.0, 0.0),\n";
code += " vec3(0.0, cos(orbit_velocities.x), sin(orbit_velocities.x)),\n";
code += " vec3(0.0, -sin(orbit_velocities.x), cos(orbit_velocities.x))\n";
code += " );\n";
code += " vec3 new_pos = x_rotation_mat * local_pos;\n";
code += " displacement = new_pos - local_pos;\n\n";
code += " // Y axis.\n";
code += " local_pos = (inverse(emission_transform) * transform[3]).xyz;\n";
code += " local_pos -= velocity_pivot;\n";
code += " local_pos.y = 0.0;\n";
code += " mat3 y_rotation_mat = mat3(\n";
code += " vec3(cos(orbit_velocities.y), 0.0, -sin(orbit_velocities.y)),\n";
code += " vec3(0.0, 1.0, 0.0),\n";
code += " vec3(sin(orbit_velocities.y), 0.0, cos(orbit_velocities.y))\n";
code += " );\n";
code += " new_pos = y_rotation_mat * local_pos;\n";
code += " displacement += new_pos - local_pos;\n\n";
code += " // Z axis.\n";
code += " local_pos = (inverse(emission_transform) * transform[3]).xyz;\n";
code += " local_pos -= velocity_pivot;\n";
code += " local_pos.z = 0.0;\n";
code += " mat3 z_rotation_mat = mat3(\n";
code += " vec3(cos(orbit_velocities.z), sin(orbit_velocities.z), 0.0),\n";
code += " vec3(-sin(orbit_velocities.z), cos(orbit_velocities.z), 0.0),\n";
code += " vec3(0.0, 0.0, 1.0)\n";
code += " );\n";
code += " new_pos = z_rotation_mat * local_pos;\n";
code += " displacement += new_pos - local_pos;\n\n";
}
code += " return (emission_transform * vec4(displacement / delta, 0.0)).xyz;\n";
code += "}\n\n";
}
code += "vec3 get_random_direction_from_spread(inout uint alt_seed, float spread_angle) {\n";
code += " float pi = 3.14159;\n";
code += " float degree_to_rad = pi / 180.0;\n";
code += " float spread_rad = spread_angle * degree_to_rad;\n";
if (particle_flags[PARTICLE_FLAG_DISABLE_Z]) {
// Spread calculation for 2D.
code += " float angle1_rad = rand_from_seed_m1_p1(alt_seed) * spread_rad;\n";
code += " angle1_rad += direction.x != 0.0 ? atan(direction.y, direction.x) : sign(direction.y) * (pi / 2.0);\n";
code += " vec3 spread_direction = vec3(cos(angle1_rad), sin(angle1_rad), 0.0);\n";
code += " return spread_direction;\n";
} else {
// Spread calculation for 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), 0.0, cos(angle1_rad));\n";
code += " vec3 direction_yz = vec3(0.0, sin(angle2_rad), cos(angle2_rad));\n";
code += " direction_yz.z = direction_yz.z / max(0.0001, sqrt(abs(direction_yz.z))); // Better uniform distribution.\n";
code += " vec3 spread_direction = vec3(direction_xz.x * direction_yz.z, direction_yz.y, direction_xz.z * direction_yz.z);\n";
code += " vec3 direction_nrm = length(direction) > 0.0 ? normalize(direction) : vec3(0.0, 0.0, 1.0);\n";
code += " // Rotate spread to direction.\n";
code += " vec3 binormal = cross(vec3(0.0, 1.0, 0.0), direction_nrm);\n";
code += " if (length(binormal) < 0.0001) {\n";
code += " // Direction is parallel to Y. Choose Z as the binormal.\n";
code += " binormal = vec3(0.0, 0.0, 1.0);\n";
code += " }\n";
code += " binormal = normalize(binormal);\n";
code += " vec3 normal = cross(binormal, direction_nrm);\n";
code += " spread_direction = binormal * spread_direction.x + normal * spread_direction.y + direction_nrm * spread_direction.z;\n";
code += " return normalize(spread_direction);\n";
}
code += "}\n\n";
code += "vec3 process_radial_displacement(DynamicsParameters param, float lifetime, inout uint alt_seed, mat4 transform, mat4 emission_transform, float delta) {\n";
code += " vec3 radial_displacement = vec3(0.0);\n";
code += " if (delta < 0.001) {\n";
code += " return radial_displacement;\n";
code += " }\n";
code += " float radial_displacement_multiplier = 1.0;\n";
if (tex_parameters[PARAM_RADIAL_VELOCITY].is_valid()) {
code += " radial_displacement_multiplier = texture(radial_velocity_curve, vec2(lifetime)).r;\n";
}
code += " vec3 global_pivot = (emission_transform * vec4(velocity_pivot, 1.0)).xyz;\n";
code += " if (length(transform[3].xyz - global_pivot) > 0.01) {\n";
code += " radial_displacement = normalize(transform[3].xyz - global_pivot) * radial_displacement_multiplier * param.radial_velocity;\n";
code += " } else {\n";
code += " radial_displacement = get_random_direction_from_spread(alt_seed, 360.0) * param.radial_velocity;\n";
code += " }\n";
code += " if (radial_displacement_multiplier * param.radial_velocity < 0.0) {\n";
code += " // Prevent inwards velocity to flicker once the point is reached.\n";
code += " radial_displacement = normalize(radial_displacement) * min(abs(radial_displacement_multiplier * param.radial_velocity), length(transform[3].xyz - global_pivot) / delta);\n";
code += " }\n";
code += " return radial_displacement;\n";
code += "}\n\n";
if (tex_parameters[PARAM_DIRECTIONAL_VELOCITY].is_valid()) {
code += "vec3 process_directional_displacement(DynamicsParameters param, float lifetime_percent, mat4 transform, mat4 emission_transform) {\n";
code += " vec3 displacement = texture(directional_velocity_curve, vec2(lifetime_percent)).xyz * param.directional_velocity;\n";
if (directional_velocity_global) {
code += " displacement = (emission_transform * vec4(displacement, 0.0)).xyz;\n";
}
code += " return displacement;\n";
code += "}\n\n";
}
code += "void process_physical_parameters(inout PhysicalParameters params, float lifetime_percent) {\n";
if (tex_parameters[PARAM_LINEAR_ACCEL].is_valid()) {
code += " params.linear_accel *= texture(linear_accel_texture, vec2(lifetime_percent)).r;\n";
}
if (tex_parameters[PARAM_RADIAL_ACCEL].is_valid()) {
code += " params.radial_accel *= texture(radial_accel_texture, vec2(lifetime_percent)).r;\n";
}
if (tex_parameters[PARAM_TANGENTIAL_ACCEL].is_valid()) {
code += " params.tangent_accel *= texture(tangent_accel_texture, vec2(lifetime_percent)).r;\n";
}
if (tex_parameters[PARAM_DAMPING].is_valid()) {
code += " params.damping *= texture(damping_texture, vec2(lifetime_percent)).r;\n";
}
code += "}\n\n";
code += "void start() {\n";
code += " uint base_number = NUMBER;\n";
code += " uint alt_seed = hash(base_number + uint(1) + RANDOM_SEED);\n";
code += " DisplayParameters params;\n";
code += " calculate_initial_display_params(params, alt_seed);\n";
code += " // Reset alt seed?\n";
code += " //alt_seed = hash(base_number + uint(1) + RANDOM_SEED);\n";
code += " DynamicsParameters dynamic_params;\n";
code += " calculate_initial_dynamics_params(dynamic_params, alt_seed);\n";
code += " PhysicalParameters physics_params;\n";
code += " calculate_initial_physical_params(physics_params, alt_seed);\n";
code += " process_display_param(params, 0.0);\n";
code += " if (rand_from_seed(alt_seed) > AMOUNT_RATIO) {\n";
code += " ACTIVE = false;\n";
code += " }\n\n";
code += " if (RESTART_CUSTOM) {\n";
code += " CUSTOM = vec4(0.0);\n";
code += " CUSTOM.w = params.lifetime;\n";
code += " CUSTOM.x = dynamic_params.angle;\n";
code += " }\n";
code += " if (RESTART_COLOR) {\n";
code += " COLOR = params.color;\n";
code += " }\n";
code += " if (RESTART_ROT_SCALE) {\n";
code += " TRANSFORM[0].xyz = vec3(1.0, 0.0, 0.0);\n";
code += " TRANSFORM[1].xyz = vec3(0.0, 1.0, 0.0);\n";
code += " TRANSFORM[2].xyz = vec3(0.0, 0.0, 1.0);\n";
code += " }\n";
code += " if (RESTART_POSITION) {\n";
code += " TRANSFORM[3].xyz = calculate_initial_position(alt_seed);\n";
if (turbulence_enabled) {
code += " float initial_turbulence_displacement = mix(turbulence_initial_displacement_min, turbulence_initial_displacement_max, rand_from_seed(alt_seed));\n";
code += " vec3 noise_direction = get_noise_direction(TRANSFORM[3].xyz);\n";
code += " TRANSFORM[3].xyz += noise_direction * initial_turbulence_displacement;\n";
}
code += " TRANSFORM = EMISSION_TRANSFORM * TRANSFORM;\n";
code += " }\n";
code += " if (RESTART_VELOCITY) {\n";
code += " VELOCITY = get_random_direction_from_spread(alt_seed, spread) * dynamic_params.initial_velocity_multiplier;\n";
if (emission_shape == EMISSION_SHAPE_DIRECTED_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";
if (particle_flags[PARTICLE_FLAG_DISABLE_Z]) {
code += " {\n";
code += " mat2 rotm;\n";
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";
code += " }\n";
} else {
code += " {\n";
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(0.0, 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";
code += " }\n";
}
}
code += " }\n\n";
code += " process_display_param(params, 0.0);\n\n";
code += " VELOCITY = (EMISSION_TRANSFORM * vec4(VELOCITY, 0.0)).xyz;\n";
code += " VELOCITY += EMITTER_VELOCITY * inherit_emitter_velocity_ratio;\n";
if (particle_flags[PARTICLE_FLAG_DISABLE_Z]) {
code += " VELOCITY.z = 0.0;\n";
code += " TRANSFORM[3].z = 0.0;\n";
}
code += "}\n\n";
code += "void process() {\n";
code += " uint base_number = NUMBER;\n";
// TODO: Add optional determinism here.
code += " //if (repeatable) {\n";
code += " // base_number = INDEX;\n";
code += " //}\n";
code += " uint alt_seed = hash(base_number + uint(1) + RANDOM_SEED);\n";
code += " DisplayParameters params;\n";
code += " calculate_initial_display_params(params, alt_seed);\n";
code += " DynamicsParameters dynamic_params;\n";
code += " calculate_initial_dynamics_params(dynamic_params, alt_seed);\n";
code += " PhysicalParameters physics_params;\n";
code += " calculate_initial_physical_params(physics_params, alt_seed);\n\n";
code += " float pi = 3.14159;\n";
code += " float degree_to_rad = pi / 180.0;\n\n";
code += " CUSTOM.y += DELTA / LIFETIME;\n";
code += " CUSTOM.y = mix(CUSTOM.y, 1.0, INTERPOLATE_TO_END);\n";
code += " float lifetime_percent = CUSTOM.y / params.lifetime;\n";
code += " if (CUSTOM.y > CUSTOM.w) {\n";
code += " ACTIVE = false;\n";
code += " }\n\n";
code += " // Calculate all velocity.\n";
code += " vec3 controlled_displacement = vec3(0.0);\n";
if (tex_parameters[PARAM_ORBIT_VELOCITY].is_valid() || particle_flags[PARTICLE_FLAG_DISABLE_Z]) {
code += " controlled_displacement += process_orbit_displacement(dynamic_params, lifetime_percent, alt_seed, TRANSFORM, EMISSION_TRANSFORM, DELTA, params.lifetime * LIFETIME);\n";
}
code += " controlled_displacement += process_radial_displacement(dynamic_params, lifetime_percent, alt_seed, TRANSFORM, EMISSION_TRANSFORM, DELTA);\n";
if (tex_parameters[PARAM_DIRECTIONAL_VELOCITY].is_valid()) {
code += " controlled_displacement += process_directional_displacement(dynamic_params, lifetime_percent, TRANSFORM, EMISSION_TRANSFORM);\n";
}
code += "\n";
code += " process_physical_parameters(physics_params, lifetime_percent);\n";
code += " vec3 force;\n";
code += " {\n";
code += " // Copied from previous version.\n";
code += " vec3 pos = TRANSFORM[3].xyz;\n";
code += " force = gravity;\n";
code += " // Apply linear acceleration.\n";
code += " force += length(VELOCITY) > 0.0 ? normalize(VELOCITY) * physics_params.linear_accel : 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) * physics_params.radial_accel : vec3(0.0);\n";
code += " // Apply tangential acceleration.\n";
code += " float tangent_accel_val = physics_params.tangent_accel;\n";
if (particle_flags[PARTICLE_FLAG_DISABLE_Z]) {
code += " force += length(diff.yx) > 0.0 ? vec3(normalize(diff.yx * vec2(-1.0, 1.0)), 0.0) * tangent_accel_val : vec3(0.0);\n";
} else {
code += " vec3 crossDiff = cross(normalize(diff), normalize(gravity));\n";
code += " force += length(crossDiff) > 0.0 ? normalize(crossDiff) * tangent_accel_val : vec3(0.0);\n";
}
if (attractor_interaction_enabled) {
code += " force += ATTRACTOR_FORCE;\n";
}
if (particle_flags[PARTICLE_FLAG_DISABLE_Z]) {
code += " force.z = 0.0;\n";
}
code += " // Apply attractor forces.\n";
code += " VELOCITY += force * DELTA;\n";
code += " }\n";
code += " {\n";
code += " // Copied from previous version.\n";
code += " if (physics_params.damping > 0.0) {\n";
code += " float v = length(VELOCITY);\n";
if (!particle_flags[PARTICLE_FLAG_DAMPING_AS_FRICTION]) {
code += " v -= physics_params.damping * DELTA;\n";
} else {
code += " if (v > 0.001) {\n";
code += " // Realistic friction formula. We assume the mass of a particle to be 0.05 kg.\n";
code += " float damp = v * v * physics_params.damping * 0.05 * DELTA;\n";
code += " v -= damp;\n";
code += " }\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 += " }\n\n";
if (collision_mode == COLLISION_RIGID) {
code += " if (COLLIDED) {\n";
code += " float collision_response = dot(COLLISION_NORMAL, VELOCITY);\n";
code += " float slide_to_bounce_trigger = step(2.0 / clamp(collision_bounce + 1.0, 1.0, 2.0), abs(collision_response));\n";
code += " TRANSFORM[3].xyz += COLLISION_NORMAL * COLLISION_DEPTH;\n";
code += " // Remove all components of VELOCITY that are not tangential to COLLISION_NORMAL.\n";
code += " VELOCITY -= COLLISION_NORMAL * collision_response;\n";
code += " // Apply friction only to VELOCITY across the surface (effectively decouples friction and bounce behavior).\n";
code += " VELOCITY = mix(VELOCITY, vec3(0.0), clamp(collision_friction, 0.0, 1.0));\n";
code += " // Add bounce velocity to VELOCITY.\n";
code += " VELOCITY -= COLLISION_NORMAL * collision_response * (collision_bounce * slide_to_bounce_trigger);\n";
code += " }\n\n";
} else if (collision_mode == COLLISION_HIDE_ON_CONTACT) {