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Feature slowdown time #37

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3cf7f97
Slow down game fixed step delta time on keypress 'b' (WIP)
lloydlobo Nov 9, 2024
219fd95
Apply continuity of player shield/health through each level
lloydlobo Nov 9, 2024
ea2a454
Experiment with resizing window size to reflect in shaders
lloydlobo Nov 9, 2024
0acab6b
Update magic config numbers to suit slowed game time feature
lloydlobo Nov 9, 2024
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8 changes: 4 additions & 4 deletions src/config.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -33,7 +33,7 @@ local _cret_max_speed = 100 -- 32..120
local _cret_min_radius = 8
local _cret_min_speed = 32
local _f_cret_scale = 1. -- factor
local _f_cret_speed = 1. -- factor
local _f_cret_speed = 1.4 -- factor

--- @type CreatureStage[] Size decreases as stage progresses.
local _CREATURE_STAGES = {
Expand Down Expand Up @@ -178,8 +178,8 @@ return {
FIXED_DT = 1 / _fixed_fps, --- Consistent update frame rate fluctuations.
FIXED_DT_INV = 1 / (1 / _fixed_fps), --- Helper constant to avoid dividing on each frame. (same as FIXED_FPS)
FIXED_FPS = _fixed_fps,
GAME_MAX_LEVEL = 2 ^ 6, -- > 64
LASER_FIRE_TIMER_LIMIT = (_inv_phi ^ 2.0) * ({ 0.21, 0.16, 0.14 })[_speed_mode], --- Reduce this to increase fire rate.
GAME_MAX_LEVEL = 2 ^ 4, -- > 16
LASER_FIRE_TIMER_LIMIT = (_inv_phi ^ 1.0) * ({ 0.2, 0.16, 0.14 })[_speed_mode], --- Reduce this to increase fire rate.
LASER_MAX_CAPACITY = 2 ^ 8, -- Choices: 2^4(balanced [nerfs fast fire rate]) | 2^5 (long range)
LASER_PROJECTILE_SPEED = ({ 2 ^ 7, 2 ^ 8, 2 ^ 8 + 256 })[_speed_mode], --- 256|512|768
LASER_RADIUS = (_inv_phi ^ 1) * math.max(_inv_phi * _player_radius, math.floor(_player_radius * (_inv_phi ^ (1 * _phi)))),
Expand All @@ -193,7 +193,7 @@ return {
PLAYER_ACCELERATION = math.floor(3 * (true and 1 or 1.25) * ({ 150, 200, 300 })[_speed_mode]),
PLAYER_CIRCLE_IRIS_TO_EYE_RATIO = _inv_phi,
PLAYER_ROT_TURN_SPEED = ({ (10 * _inv_phi), 10, -2 + (30 / 2) / 4 + (_player_accel / _fixed_fps) })[_speed_mode],
PLAYER_TURN_SPEED_BESERK_MULTIPLIER = _phi * _phi,
PLAYER_TURN_SPEED_BESERK_MULTIPLIER = _phi * 1.0,
PLAYER_FIRE_COOLDOWN_TIMER_LIMIT = ({ 4, 6, 12 })[_speed_mode], --- FIXME: Implement this (6 is rough guess, but intend for alpha lifecycle from 0.0 to 1.0.) -- see if this is in love.load()
PLAYER_FIRING_EDGE_MAX_RADIUS = (0.6 * math.ceil(_player_radius * (true and 0.328 or (_inv_phi * _inv_phi)))), --- Trigger distance from center of player.
PLAYER_FIRING_EDGE_RADIUS = (0.9 * math.ceil(_player_radius * (true and 0.328 or (_inv_phi * _inv_phi)))), --- Trigger distance from center of player.
Expand Down
191 changes: 169 additions & 22 deletions src/main.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -591,9 +591,10 @@ function update_player_position_this_frame(dt)
end

function update_player_vulnerability_timer_this_frame(dt)
local f_dt = 0.5 -- 0..1
local cs = curr_state
if cs.player_invulnerability_timer > 0 then
cs.player_invulnerability_timer = cs.player_invulnerability_timer - dt
cs.player_invulnerability_timer = cs.player_invulnerability_timer - f_dt * dt
if cs.player_invulnerability_timer <= 0 then cs.player_invulnerability_timer = 0 end
end
end
Expand Down Expand Up @@ -999,7 +1000,8 @@ function handle_player_input_this_frame(dt)
-- Enhance attributes while spinning like a top.
--[[TODO: On init, emit a burst of lasers automatically. Give player some respite]]
player_turn_speed = Config.PLAYER_ROT_TURN_SPEED * Config.PLAYER_TURN_SPEED_BESERK_MULTIPLIER
laser_fire_timer = (love.math.random() < 0.05) and 0 or game_timer_dt
-- laser_fire_timer = (love.math.random() < 0.05) and 0 or game_timer_dt
laser_fire_timer = game_timer_dt
elseif has_companions then
player_turn_speed = Config.PLAYER_ROT_TURN_SPEED * INV_PHI_SQ
else
Expand Down Expand Up @@ -2119,6 +2121,14 @@ function update_game(dt) ---@param dt number # Fixed delta time.
music_bgm:setEffect('on_damage_lowpass', not true)
music_bgm:setEffect('on_damage_reverb', not true)
end

if is_slowed_game_time then
music_bgm:setEffect('on_bullet_time_lofi', true)
music_bgm:setEffect('on_damage_lowpass', true)
music_bgm:setEffect('on_damage_reverb', true)
else
music_bgm:setEffect('on_bullet_time_lofi', not true)
end
end

--- FIXME: When I set a refresh rate of 75.00 Hz on a 800 x 600 (4:3)
Expand All @@ -2137,6 +2147,7 @@ function draw_game(alpha)
draw_player_shield_collectible(alpha)
draw_player_collectible_indicators(alpha)
draw_player(alpha)
LG.print(string.format('bullet_time: %s | dt: %.4f | alpha: %.4f', tostring(is_slowed_game_time), game_timer_dt, alpha), 100, 100)
end

--
Expand Down Expand Up @@ -2241,21 +2252,42 @@ function load_audio()
end

-- Effects
-- Create a low-pass filter effect -- see https://love2d.org/wiki/EffectType
do
local on_damage_lowpass_effect_opts =
{ type = 'equalizer', highcut = 4000, highgain = 0.126, highmidgain = 0.126, lowgain = 2, lowmidfrequency = 500, lowmidgain = 0.126, volume = 2.0 }
love.audio.setEffect('on_damage_lowpass', on_damage_lowpass_effect_opts) -- Create a low-pass filter effect -- see https://love2d.org/wiki/EffectType
local on_damage_lowpass_effect_opts = {
type = 'equalizer',
highcut = 4000,
highgain = 0.126,
highmidgain = 0.126,
lowgain = 2,
lowmidfrequency = 500,
lowmidgain = 0.126,
volume = 2.0,
}
love.audio.setEffect('on_damage_lowpass', on_damage_lowpass_effect_opts)

-- frequency: `default: 800` ─ I want a hollow eerie effect (100 is great for ross_bugden_chime_chase)
-- highcut: ... use a freq which is consistently playing (1000Hz)
--- @alias Waveform 'sine' | 'square' | 'sawtooth'
local waveform = 'sine'--[[@type Waveform]]
local on_damage_effect_opts =
{ type = 'ringmodulator', frequency = 100, highcut = lume.clamp(450, 0, 24000), waveform = waveform, volume = INV_PHI ^ 8 }
local on_damage_effect_opts = {
type = 'ringmodulator',
frequency = 100,
highcut = lume.clamp(450, 0, 24000),
waveform = waveform,
volume = INV_PHI ^ 8,
}
love.audio.setEffect('on_damage_reverb', on_damage_effect_opts)

local master_effect_opts = { type = 'reverb', volume = 0.5 } --[[decaytime = lume.clamp(1.49 * (PHI * 1), 0.1, 20), roomrolloff = lume.clamp(PHI, 0, 10), gain = 0.32 * PHI_INV, volume = PHI_INV, ]]
--[[decaytime = lume.clamp(1.49 * (PHI * 1), 0.1, 20), roomrolloff = lume.clamp(PHI, 0, 10), gain = 0.32 * PHI_INV, volume = PHI_INV, ]]
local master_effect_opts = { type = 'reverb', volume = 0.5 }
love.audio.setEffect('master_reverb', master_effect_opts)

love.audio.setEffect('on_bullet_time_lofi', {
type = 'flanger',
rate = 0.27 * PHI ^ 4, -- [0, 10]
-- volume = 1,
})
end

do
Expand Down Expand Up @@ -2303,13 +2335,13 @@ function load_shaders()
}

-- Load moonshine shaders
local moonshine = require 'lib.moonshine'
local fx = moonshine.effects
moonshine = require 'lib.moonshine'
moonshine_fx = moonshine.effects

--- @class (exact) MoonshineShaders
--- @field fog table
moonshine_shaders = {
fog = moonshine(arena_w, arena_h, fx.fog).chain(fx.desaturate) --[[ desaturate removes ocataves(frequency) lines ]],
fog = moonshine(arena_w, arena_h, moonshine_fx.fog).chain(moonshine_fx.desaturate) --[[ desaturate removes ocataves(frequency) lines ]],
}

-- Setup moonshine shaders
Expand All @@ -2325,7 +2357,8 @@ function reset_game()
-- Reset game states.
do
curr_state.player_invulnerability_timer = 0
curr_state.player_health = Config.PLAYER_MAX_HEALTH
-- Allow continuity from previous level
if curr_state.player_health <= 0 then curr_state.player_health = Config.PLAYER_MAX_HEALTH end
curr_state.player_rot_angle = 0
curr_state.player_vel_x = 0
curr_state.player_vel_y = 0
Expand Down Expand Up @@ -2562,6 +2595,117 @@ function love.load()
end
end --< love.load()

---@diagnostic disable-next-line: unused-local
function update_send_shaders(dt, t, w, h)
glsl_shaders.warp:send('screen', { w, h })
glsl_shaders.warp:send('time', t)
moonshine_shaders.fog.fog.time = t
end

-- #region: bullet time (global)
-- vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv

is_slowed_game_time = not true
was_b_key_slowed_game_time_pressed = not true

-- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-- #endregion

local slowed_game_time_timestamp = 0.0
local slowed_game_time_sustain_duration_seconds = 3.0
local slowed_game_time_target_dt = 0.001

-- #region love.update variables
-- vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv

local fixed_dt = Config.FIXED_DT

-- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-- #endregion

--- Rationale: Instead of leaving hands from controls─for quick pause, we use
--- bullet time to slow things down and allow player to turn quickly / avoid
--- faster drone creatures.
function update_slowed_game_time_this_frame(dt)
if not is_slowed_game_time then
fixed_dt = Config.FIXED_DT
slowed_game_time_timestamp = 0.0
return
end

if slowed_game_time_timestamp == 0.0 then --[[]]
slowed_game_time_timestamp = love.timer.getTime()
end

if Config.Debug.IS_ASSERT then assert(love.timer.getTime() > slowed_game_time_timestamp) end

local f_rate = dt * 0.01

Timer.after(f_rate, function()
if not is_slowed_game_time then
error 'unreachable'
return
end

if Config.Debug.IS_ASSERT then assert(slowed_game_time_timestamp ~= 0) end

-- Wind rate down.
if fixed_dt - f_rate > slowed_game_time_target_dt then
fixed_dt = fixed_dt - f_rate
else
-- Now we are at desired time rate.
if Config.Debug.IS_ASSERT then--[[]]
assert(fixed_dt >= slowed_game_time_target_dt and fixed_dt + f_rate <= 0.01)
end

-- Un-wind rate up.
Timer.after(slowed_game_time_sustain_duration_seconds, function()
if Config.Debug.IS_ASSERT then
if is_slowed_game_time then assert(slowed_game_time_timestamp ~= 0) end
end

if not is_slowed_game_time then return end

Timer.after(dt, function()
if not is_slowed_game_time then
if Config.Debug.IS_ASSERT then assert(pcall(assert, fixed_dt == Config.FIXED_DT)) end -- assume
return
end
if Config.Debug.IS_ASSERT then
assert(slowed_game_time_timestamp ~= 0)
assert(dt > slowed_game_time_target_dt)
assert(fixed_dt > slowed_game_time_target_dt)
end
if fixed_dt < Config.FIXED_DT then
fixed_dt = fixed_dt + dt
else
if Config.Debug.IS_ASSERT then assert(is_slowed_game_time) end

-- Finally toggle it off.
is_slowed_game_time = not true
fixed_dt = Config.FIXED_DT
end
end)
end)
end
end)
end

function love.resize(w, h)
-- Called when the window is resized, for example if the user resizes the
-- window, or if love.window.setMode is called with an unsupported width or
-- height in fullscreen and the window chooses the closest appropriate size.
gw = w
gh = h
arena_w = w
arena_h = h

-- EXPENSIVE OPERATION (SHOULD MANUALLY SET UP GLSL)
moonshine_shaders.fog = moonshine(w, h, moonshine_fx.fog).chain(moonshine_fx.desaturate) --[[ desaturate removes ocataves(frequency) lines ]]

update_send_shaders(game_timer_dt, game_timer_t, w, h)
end

function love.update(dt)
if Config.Debug.IS_DEVELOPMENT then -- FIXME: Maybe make stuff global that are not hot-reloading?
require('lurker').update()
Expand All @@ -2585,17 +2729,20 @@ function love.update(dt)

-- #3 Update all timers based on real dt.
Timer.update(dt) -- call this every frame to update timers
do
local screen_w, screen_h = LG.getDimensions()
-- glsl_shaders.gradient_timemod:send('screen', { screen_w, screen_h })
-- glsl_shaders.gradient_timemod:send('time', love.timer.getTime())
glsl_shaders.warp:send('screen', { screen_w, screen_h })
glsl_shaders.warp:send('time', love.timer.getTime())
moonshine_shaders.fog.fog.time = love.timer.getTime()
end
update_send_shaders(dt, game_timer_t, arena_w, arena_h)

-- #4 Frame Rate Independence: Fixed timestep loop.
local fixed_dt = Config.FIXED_DT

-- Distort fixed time step `fixed_dt`.
if love.keyboard.isDown 'b' and not was_b_key_slowed_game_time_pressed then
is_slowed_game_time = not is_slowed_game_time
was_b_key_slowed_game_time_pressed = true
elseif not love.keyboard.isDown 'b' then
was_b_key_slowed_game_time_pressed = not true
end
update_slowed_game_time_this_frame(dt)

-- Run main game loop.
dt_accum = dt_accum + dt
while dt_accum >= fixed_dt do
sync_prev_state()
Expand Down Expand Up @@ -2661,7 +2808,7 @@ function love.draw()

-- #4 Draw debugging tools.
--
-- • Toggled on `h` `keyDown` event.
-- • Toggled on `h` `isDown` event.
if is_debug_hud_enable then
draw_debug_general_hud()
draw_debug_stats_hud()
Expand Down