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rng = require("rng")
shim = require("shader_shim")
world = require("world")
color = require("color")
win = require("window")
settings = require("settings")
sprites = require("world.sprites")
ecs = require("ecs")
fish = require("spawn_fish")
gen = {}
-- Generate roughly rectangular islands
-- Stategy: generate a series of points, if we're in the first 1/4, go roughly right,
-- in the second 1/4, roughtly up, in the 3rd 1/4 roughly left, and in the 4th quarter roughtly down, finally joining up at the end
-- We find the smallest aabb box in this line, and use points on this box as the other side for triangles.
n_points = 100
point_distance = 1
sides = 4
gen.generate = (seed) ->
rg = rng.generator(seed)
normal = (avg, std) ->
--print("normal with", avg, std)
rg1, rg2 = rg(),rg()
--print("rgs:",rg1, rg2)
-- Box-Muller transform
bm = math.sqrt(-2 * math.log(rg1)) * math.cos(2 * math.pi * rg2)
--print("bm was:",bm)
-- Box-Muller gives us std = e^-0.5 , avg = 0
((bm / math.exp(-1/2)) * std) + avg
shoreline = {}
shoreline[1] = vec2(0,0)
aabb_sides = {
{"y",math.max,"b"},
{"x",math.min,"r"},
{"y",math.min,"t",},
{"x",math.max,"l"}
}
aabb = {
b: n_points * point_distance
r: n_points * point_distance
t: -n_points * point_distance
l: -n_points * point_distance
}
z = 0
for i = 1, sides
for j = 1, n_points / sides
-- remap i (1->4) to (0 -> 2pi)
avg_direction = ((i-1)/sides) * (2 * math.pi)
std_direction = math.pi / 6
rng_direction = normal(avg_direction, std_direction)
--print("rng_direction ended up being:", rng_direction)
point = shoreline[#shoreline] + vec2(math.cos(rng_direction) * point_distance, math.sin(rng_direction) * point_distance)
shoreline[#shoreline + 1] = point
--print("point:", point)
--print("prev:",aabb[aabb_sides[i][3]])
aabb[aabb_sides[i][3]] = aabb_sides[i][2](aabb[aabb_sides[i][3]],point[aabb_sides[i][1]])
--print("Generated shoreline:",shoreline)
--print("And aabb box:" ,aabb)
-- Now that we have the shorline, generate the geometry
-- every point after the first needs to generate 2 triangles, 6 vertexes, each vertex is a vec3, 3 floats, 4 bytes per float
geom = am.buffer(((n_points * 2) - 4) * 6 * 3 * 4) -- 4 corners only get 1 triangle
gview = geom\view("vec3")
gview[1] = vec3(shoreline[1].x, shoreline[1].y,z)
gview[2] = vec3(aabb.l, aabb.b,z)
gview[3] = vec3(shoreline[npoints - 1].x, shoreline[npoints - 1].y, z)
gi = 4
only1 = {[25]: true, [50]: true, [75]: true}
for i = 2, npoints
gview[gi] = vec3(shoreline[i].x, shoreline[i].y, z)
if i < 25
gview[gi+1] = 1
aspect = win.width / win.height
aspect_inv = win.height / win.width
class IslandGraphicsComponent extends world.GraphicsComponent
action: (bind) =>
bind.time = am.current_time! % 1000 -- loop back around so noise doesn't look wonky after a while
--bind.lamp1 = vec4(world.world_x + 3.35, world.world_y + 1.9, 0, 2.2) --no idea why these magic numbers
--bind.lamp1 = vec4(world.world_x + (0.5 * 4 * aspect) - 0.3, world.world_y + (0.5 * 4 * (aspect_inv)) + 0.7, 0, 2.2) --no idea why these magic numbers
--bind.lamp2 = vec4(0,0,0,3)
buf_size: () =>
6
populate_buf: (geom_view, normal_view, offset) =>
z = 0
size = 10
--@lamp = world.level.add_lamp(vec4(0,0,0,3))
geom_view[1] = vec3(-size,-size,z)
geom_view[2] = vec3(-size,size,z)
geom_view[3] = vec3(size,size,z)
geom_view[4] = vec3(size,size,z)
geom_view[5] = vec3(size,-size,z)
geom_view[6] = vec3(-size,-size,z)
normal_view[1] = vec2(sprites.rocks_normal.s1, sprites.rocks_normal.t1)
normal_view[2] = vec2(sprites.rocks_normal.s1, sprites.rocks_normal.t2)
normal_view[3] = vec2(sprites.rocks_normal.s2, sprites.rocks_normal.t2)
normal_view[4] = vec2(sprites.rocks_normal.s2, sprites.rocks_normal.t2)
normal_view[5] = vec2(sprites.rocks_normal.s2, sprites.rocks_normal.t1)
normal_view[6] = vec2(sprites.rocks_normal.s1, sprites.rocks_normal.t1)
class WaterGraphicsComponent extends world.GraphicsComponent
action: (bind) =>
bind.time = am.current_time! % 1000
buf_size: () =>
24
populate_buf: (geom_view, normal_view, offset) =>
z = 1
island_size = 10 - 1
water_size = 20
uv = sprites.sea_normal
--down
geom_view[1] = vec3(-water_size,-water_size,z)
geom_view[2] = vec3(-island_size,-island_size,z)
geom_view[3] = vec3(island_size,-island_size,z)
geom_view[4] = vec3(island_size,-island_size,z)
geom_view[5] = vec3(water_size,-water_size,z)
geom_view[6] = vec3(-water_size,-water_size,z)
--left
geom_view[7] = vec3(-water_size,-water_size,z)
geom_view[8] = vec3(-island_size,island_size,z)
geom_view[9] = vec3(-island_size,-island_size,z)
geom_view[10] = vec3(-water_size,-water_size,z)
geom_view[11] = vec3(-water_size,water_size,z)
geom_view[12] = vec3(-island_size,island_size,z)
--top
geom_view[13] = vec3(-water_size,water_size,z)
geom_view[14] = vec3(water_size,water_size,z)
geom_view[15] = vec3(-island_size,island_size,z)
geom_view[16] = vec3(-island_size,island_size,z)
geom_view[17] = vec3(water_size,water_size,z)
geom_view[18] = vec3(island_size,island_size,z)
--right
geom_view[19] = vec3(island_size,island_size,z)
geom_view[20] = vec3(water_size,water_size,z)
geom_view[21] = vec3(island_size,-island_size,z)
geom_view[22] = vec3(water_size,water_size,z)
geom_view[23] = vec3(water_size,-water_size,z)
geom_view[24] = vec3(island_size,-island_size,z)
normal_view[1] = vec2(uv.s1,uv.t1)
normal_view[2] = vec2(uv.s1,uv.t1)
normal_view[3] = vec2(uv.s2,uv.t1)
normal_view[4] = vec2(uv.s2,uv.t1)
normal_view[5] = vec2(uv.s2,uv.t1)
normal_view[6] = vec2(uv.s1,uv.t1)
normal_view[7] = vec2(uv.s1,uv.t1)
normal_view[8] = vec2(uv.s1,uv.t2)
normal_view[9] = vec2(uv.s1,uv.t1)
normal_view[10] = vec2(uv.s1,uv.t1)
normal_view[11] = vec2(uv.s1,uv.t2)
normal_view[12] = vec2(uv.s1,uv.t2)
normal_view[13] = vec2(uv.s1,uv.t2)
normal_view[14] = vec2(uv.s2,uv.t2)
normal_view[15] = vec2(uv.s1,uv.t2)
normal_view[16] = vec2(uv.s1,uv.t2)
normal_view[17] = vec2(uv.s2,uv.t2)
normal_view[18] = vec2(uv.s2,uv.t2)
normal_view[19] = vec2(uv.s2,uv.t2)
normal_view[20] = vec2(uv.s2,uv.t2)
normal_view[21] = vec2(uv.s2,uv.t1)
normal_view[22] = vec2(uv.s2,uv.t2)
normal_view[23] = vec2(uv.s2,uv.t1)
normal_view[24] = vec2(uv.s2,uv.t1)
setup: (node) =>
bind = node("bind")
for k,v in pairs(color.am_lake_color)
bind[k] = v
bind.water = 2
gen.protogen = (seed) ->
ecs.Entity(nil, {
IslandGraphicsComponent("island")
})
ecs.Entity(nil, {
WaterGraphicsComponent("water")
})
gen
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