diff --git a/develop/example.lua b/develop/example.lua index 2099a1a..7aa53ad 100644 --- a/develop/example.lua +++ b/develop/example.lua @@ -1 +1,126 @@ +---@diagnostic disable: unused-local + local evo = require 'evolved' + +---@class vector2 +---@field x number +---@field y number + +---@param x number +---@param y number +local function vector2(x, y) + ---@type vector2 + return { x = x, y = y } +end + +local phases = { + awake = evo.phase():build(), + physics = evo.phase():build(), + graphics = evo.phase():build(), + shutdown = evo.phase():build(), +} + +local singles = { + delta_time = evo.fragment():single(0.016):build(), + physics_gravity = evo.fragment():single(vector2(0, 9.81)):build(), +} + +local fragments = { + force = evo.fragment():build(), + position = evo.fragment():build(), + velocity = evo.fragment():build(), +} + +local queries = { + bodies = evo.query() + :include(fragments.force, fragments.position, fragments.velocity) + :build(), +} + +local awake_system = evo.system() + :phase(phases.awake) + :process(function() + print '-= Awake =-' + evo.entity() + :set(fragments.force, vector2(0, 0)) + :set(fragments.position, vector2(0, 0)) + :set(fragments.velocity, vector2(0, 0)) + :build() + end):build() + +local integrate_forces_system = evo.system() + :phase(phases.physics) + :query(queries.bodies) + :execute(function(chunk, entities, entity_count) + ---@type number, vector2 + local delta_time, physics_gravity = + evo.get(singles.delta_time, singles.delta_time), + evo.get(singles.physics_gravity, singles.physics_gravity) + + ---@type vector2[], vector2[] + local forces, velocities = evo.select(chunk, fragments.force, fragments.velocity) + + for i = 1, entity_count do + local force, velocity = forces[i], velocities[i] + + force.x = force.x + physics_gravity.x * delta_time + force.y = force.y + physics_gravity.y * delta_time + + velocity.x = velocity.x + force.x * delta_time + velocity.y = velocity.y + force.y * delta_time + end + end):build() + +local integrate_velocities_system = evo.system() + :phase(phases.physics) + :after(integrate_forces_system) + :query(queries.bodies) + :execute(function(chunk, entities, entity_count) + ---@type number + local delta_time = + evo.get(singles.delta_time, singles.delta_time) + + ---@type vector2[], vector2[] + local positions, velocities = evo.select(chunk, fragments.position, fragments.velocity) + + for i = 1, entity_count do + local position, velocity = positions[i], velocities[i] + + position.x = position.x + velocity.x * delta_time + position.y = position.y + velocity.y * delta_time + end + end):build() + +local graphics_system = evo.system() + :phase(phases.graphics) + :query(queries.bodies) + :execute(function(chunk, entities, entity_count) + ---@type vector2[] + local positions = evo.select(chunk, fragments.position) + + for i = 1, entity_count do + local entity, position = entities[i], positions[i] + + print(string.format( + '- {entity %d} at {%.4f, %.4f}', + entity, position.x, position.y)) + end + end):build() + +local shutdown_system = evo.system() + :phase(phases.shutdown) + :process(function() + print '-= Shutdown =-' + evo.batch_destroy(queries.bodies) + end):build() + +do + evo.process(phases.awake) + + for _ = 1, 10 do + evo.process(phases.physics) + evo.process(phases.graphics) + end + + evo.process(phases.shutdown) +end