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owenbutler/main.rb

Created March 15, 2023 10:52
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tiled rendering of 16x16 sprites
Raw
main.rb
def tick args
if args.tick_count == 0
init_state args
$noise = Noise.new(2000, 4)
end
visible_tiles = get_visible_tiles(args, args.state.zoom_level, args.state.x, args.state.y)
args.outputs.sprites << visible_tiles
# args.outputs.labels << get_debug_labels(args)
# args.outputs.debug << args.gtk.framerate_diagnostics_primitives
num_work = 4
if !$work_queue.empty?
while num_work > 0
work_unit = $work_queue.pop()
process_work work_unit, args
num_work -= 1
break if $work_queue.empty?
end
end
check_input args
end
def create_tile args, x, y, key
work_unit = {
rtkey: key,
x: x,
y: y,
ty: 0,
tx: 0,
complete: false,
}
rt = args.render_target(work_unit.rtkey)
rt.clear_before_render = false
rt.width = 256
rt.height = 256
$work_queue << work_unit
return { x: x, y: y, rtkey: key}
end
def process_work work_unit, args
SCALE = 0.002
rt = args.render_target(work_unit.rtkey)
rt.clear_before_render = false
rt.width = 256
rt.height = 256
num_tiles = 0
while work_unit.ty < 256
while work_unit.tx < 256
noisex = work_unit.x + work_unit.tx
noisey = work_unit.y + work_unit.ty
noise_val = $noise.get(noisex * SCALE, noisey * SCALE)
normalised_noise = ((noise_val + 1) * ($ground_sprites.length / 2)).floor
tile = $ground_sprites[normalised_noise].clone
tile.x = work_unit.tx
tile.y = work_unit.ty
rt.sprites << tile
object_chance = rand()
if object_chance > 0.94
object_tile = $object_sprites[tile.layer].sample.clone
object_tile.x = work_unit.tx
object_tile.y = work_unit.ty
rt.sprites << object_tile
end
work_unit.tx += 16
num_tiles += 1
end
work_unit.ty += 16
work_unit.tx = 0
end
#rt.borders << [0, 0, 256, 256, val, val, val, 255]
#rt.labels << { x: 128, y: 128, text: key}
#rt.labels << { x: 128, y: 100, text: val.to_s}
end
$tiles = {}
$work_queue = []
$ground_sprites = [
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/Shore.png", source_x: 80, layer: :water},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/Shore.png", source_x: 80, layer: :water},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/Shore.png", source_x: 64, layer: :water},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/Shore.png", source_x: 64, layer: :water},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/Shore.png", source_x: 48, layer: :water},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/Shore.png", source_x: 32, layer: :water},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/Shore.png", source_x: 16, layer: :water},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/Shore.png", source_x: 0, layer: :shore},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/Shore.png", source_x: 0, layer: :shore},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/Shore.png", source_x: 0, layer: :shore},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/TexturedGrass.png", source_x: 0, layer: :grass},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/TexturedGrass.png", source_x: 16, layer: :grass},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/TexturedGrass.png", source_x: 32, layer: :grass},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/TexturedGrass.png", source_x: 0, source_y: 16, layer: :grass},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/TexturedGrass.png", source_x: 16, source_y: 16, layer: :grass},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/TexturedGrass.png", source_x: 32, source_y: 16, layer: :grass},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/DeadGrass.png", source_x: 0, layer: :deadgrass},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/DeadGrass.png", source_x: 16, layer: :deadgrass},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/DeadGrass.png", source_x: 32, layer: :deadgrass},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/DeadGrass.png", source_x: 0, source_y: 16, layer: :deadgrass},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/DeadGrass.png", source_x: 16, source_y: 16, layer: :deadgrass},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/DeadGrass.png", source_x: 32, source_y: 16, layer: :deadgrass},
# {x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/Grass.png", source_x: 16},
# {x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/Grass.png", source_x: 32},
# {x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/Grass.png", source_x: 48},
# {x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/Grass.png", source_x: 64},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/Winter.png", source_x: 80, layer: :mountain},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/Winter.png", source_x: 80, layer: :mountain},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/Winter.png", source_x: 80, layer: :mountain},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/Winter.png", source_x: 64, layer: :snow},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/Winter.png", source_x: 64, layer: :snow},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/Winter.png", source_x: 64, layer: :snow},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/Winter.png", source_x: 64, layer: :snow},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/Winter.png", source_x: 64, layer: :snow},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/Winter.png", source_x: 64, layer: :snow},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/Winter.png", source_x: 64, layer: :snow},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Ground/Winter.png", source_x: 64, layer: :snow},
]
$object_sprites = {
water: [
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Animals/MarineAnimals.png", source_x: 0, source_y: 0},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Animals/MarineAnimals.png", source_x: 16, source_y: 0},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Animals/MarineAnimals.png", source_x: 32, source_y: 0},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Animals/MarineAnimals.png", source_x: 48, source_y: 0},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Animals/MarineAnimals.png", source_x: 64, source_y: 0},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Animals/MarineAnimals.png", source_x: 0, source_y: 16},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Animals/MarineAnimals.png", source_x: 16, source_y: 16},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Animals/MarineAnimals.png", source_x: 32, source_y: 16},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Animals/MarineAnimals.png", source_x: 48, source_y: 16},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Animals/MarineAnimals.png", source_x: 64, source_y: 16},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Animals/MarineAnimals.png", source_x: 0, source_y: 32},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Animals/MarineAnimals.png", source_x: 16, source_y: 32},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Animals/MarineAnimals.png", source_x: 32, source_y: 32},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Animals/MarineAnimals.png", source_x: 48, source_y: 32},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Animals/MarineAnimals.png", source_x: 64, source_y: 32},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Animals/MarineAnimals.png", source_x: 0, source_y: 48},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Animals/MarineAnimals.png", source_x: 16, source_y: 48},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Animals/MarineAnimals.png", source_x: 32, source_y: 48},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Animals/MarineAnimals.png", source_x: 48, source_y: 48},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Animals/MarineAnimals.png", source_x: 64, source_y: 48},
],
shore: [
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Nature/CoconutTrees.png", source_x: 0},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Nature/CoconutTrees.png", source_x: 16},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Nature/CoconutTrees.png", source_x: 32},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Nature/CoconutTrees.png", source_x: 64},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Nature/CoconutTrees.png", source_x: 80},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Nature/CoconutTrees.png", source_x: 96},
],
grass: [
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Nature/Trees.png", source_x: 0},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Nature/Trees.png", source_x: 16},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Nature/Trees.png", source_x: 32},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Nature/Trees.png", source_x: 64},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Nature/Wheatfield.png", source_x: 0},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Nature/Wheatfield.png", source_x: 16},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Nature/Wheatfield.png", source_x: 32},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Nature/Wheatfield.png", source_x: 64},
],
deadgrass: [
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Nature/DeadTrees.png", source_x: 0},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Nature/DeadTrees.png", source_x: 16},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Nature/DeadTrees.png", source_x: 32},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Nature/DeadTrees.png", source_x: 64},
],
mountain: [
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Nature/Rocks.png", source_x: 0},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Nature/Rocks.png", source_x: 16},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Nature/Rocks.png", source_x: 32},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Nature/Rocks.png", source_x: 0, source_y: 48},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Nature/Rocks.png", source_x: 16, source_y: 48},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Nature/Rocks.png", source_x: 32, source_y: 48},
],
snow: [
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Nature/WinterDeadTrees.png", source_x: 32},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Nature/WinterDeadTrees.png", source_x: 64},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Nature/WinterTrees.png", source_x: 16},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Nature/WinterTrees.png", source_x: 32},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Nature/WinterTrees.png", source_x: 48},
{x: 0, y:0, w: 16, h: 16, source_w: 16, source_h: 16, path: "sprites/MiniWorldSprites/Nature/PineTrees.png", source_x: 32},
],
}
def get_visible_tiles args, zoom, xpos, ypos
visible_tiles = []
unzoomed_x_left = xpos - (1280/2)
unzoomed_y_bottom = ypos - (720/2)
zoomed_x_left = unzoomed_x_left / zoom
zoomed_y_bottom = unzoomed_y_bottom / zoom
y = zoomed_y_bottom.to_i - (zoomed_y_bottom.to_i % 256)
yupper = zoomed_y_bottom + (720 / zoom) + (256 * zoom)
while y < yupper
x = zoomed_x_left.to_i - (zoomed_x_left.to_i % 256)
xupper = zoomed_x_left + (1280 / zoom) + (256 * zoom)
while x < xupper
key = "#{x}_#{y}"
if $tiles.key?(key)
tile = $tiles[key]
else
tile = create_tile(args, x, y, key)
$tiles[key] = tile
end
visible_tiles << convert_tile_to_screen(tile, zoom, xpos, ypos)
x += 256
end
y += 256
end
return visible_tiles
end
def convert_tile_to_screen tile, zoom, xpos, ypos
tile_to_screen_x = 1280 / 2 + tile.x * zoom
tile_to_screen_y = 720 / 2 + tile.y * zoom
return {
x: tile_to_screen_x - xpos,
y: tile_to_screen_y - ypos,
w: 256 * zoom,
h: 256 * zoom,
path: tile.rtkey,
}
end
def init_state args
state = args.state
state.zoom_level = 1
state.x = 0
state.y = 0
end
def check_input args
check_zoom args
check_movement args
end
def check_zoom args
mouse = args.inputs.mouse
scroll_wheel = mouse.wheel
if scroll_wheel
sd = scroll_wheel.y
if sd < 0
args.state.zoom_level *= 0.90
else
args.state.zoom_level *= 1.1
end
end
end
def check_movement args
move_speed = 10.0 / args.state.zoom_level / args.state.zoom_level
move_speed = move_speed.lesser(10.0)
inputs = args.inputs
args.state.x += move_speed if inputs.right
args.state.x -= move_speed if inputs.left
args.state.y += move_speed if inputs.up
args.state.y -= move_speed if inputs.down
end
def get_debug_labels args
s = args.state
[
{
x: 20,
y: 20,
text: "z: #{s.zoom_level}, x: #{s.x}, y: #{s.y}",
}
]
end
# Noise from : https://github.com/Lyniat/Dragon-Ruby-Value-Noise
# Licence for Noise:
# BSD 3-Clause License
#
# Copyright (c) 2022, Laurin Muth
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this
# list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# 3. Neither the name of the copyright holder nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
class Noise
SIN = 0.479425538604203
COS = 0.877582561890372
# primes and gradients from https://github.com/Auburn/FastNoiseLite/blob/master/JavaScript/FastNoiseLite.js
PRIME_X = 501125321
PRIME_Y = 1136930381
GRADIENTS =
[
0.130526192220052, 0.99144486137381, 0.38268343236509, 0.923879532511287, 0.608761429008721, 0.793353340291235, 0.793353340291235, 0.608761429008721,
0.923879532511287, 0.38268343236509, 0.99144486137381, 0.130526192220051, 0.99144486137381, -0.130526192220051, 0.923879532511287, -0.38268343236509,
0.793353340291235, -0.60876142900872, 0.608761429008721, -0.793353340291235, 0.38268343236509, -0.923879532511287, 0.130526192220052, -0.99144486137381,
-0.130526192220052, -0.99144486137381, -0.38268343236509, -0.923879532511287, -0.608761429008721, -0.793353340291235, -0.793353340291235, -0.608761429008721,
-0.923879532511287, -0.38268343236509, -0.99144486137381, -0.130526192220052, -0.99144486137381, 0.130526192220051, -0.923879532511287, 0.38268343236509,
-0.793353340291235, 0.608761429008721, -0.608761429008721, 0.793353340291235, -0.38268343236509, 0.923879532511287, -0.130526192220052, 0.99144486137381,
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]
def initialize(seed = 1337, octaves = 3)
@seed = seed
@octaves = octaves
end
def get(pos_x, pos_y) # fbm
v = 0
a = 0.5
i = 0
while i < @octaves
v += a * noise(pos_x, pos_y)
r_x, r_y = rotate(pos_x * 2, pos_y * 2)
pos_x = r_x + 100
pos_y = r_y + 100
a *= 0.5
i += 1
end
v
end
def noise(x, y)
i_x = x.floor
i_y = y.floor
f_x = fract(x)
f_y = fract(y)
# Four corners in 2D of a tile
a = gradient(i_x, i_y)
b = gradient(i_x + 1, i_y)
c = gradient(i_x, i_y + 1)
d = gradient(i_x + 1, i_y + 1)
# Smooth Interpolation
# Cubic Hermine Curve
u_x = f_x * f_x * (3 - 2 * f_x)
u_y = f_y * f_y * (3 - 2 * f_y)
# Mix 4 corners percentages
mix(a, b, u_x) + (c - a) * u_y * (1.0 - u_x) + (d - b) * u_x * u_y
end
def rotate(x, y)
[COS * x + SIN * y, -SIN * x + COS * y]
end
def gradient(x, y)
i = (@seed ^ (x * PRIME_X) ^ (y * PRIME_Y)).to_i % 255
GRADIENTS[i]
end
def fract(num)
num - num.floor
end
def mix(x, y, a)
x * (1 - a) + y * a
end
end
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