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local CHUNK_SIZE = require"common.constants".CHUNK_SIZE
local coords = require"common.coords"
local tau = 2*math.pi
-- funny hexagon
local vertices = {}
-- v[1] {0,0}, fill
-- v[2-7] edge, fill
-- v[8-13] inner, outline
-- v[14-19] outer, outline
local map = {}
do
local function ix(n) return n%6 end
local function th(n) return tau*(ix(n)+0.5)/6 end
local cos,sin = math.cos,math.sin
local OLWIDTH = 0.11
local hw = OLWIDTH/2
local ri,ro = 1-hw,1+hw
local function ve(n,f) return {cos(th(n)),sin(th(n)), f} end
local function vi(n,f) return {ri*cos(th(n)),ri*sin(th(n)), f} end
local function vo(n,f) return {ro*cos(th(n)),ro*sin(th(n)), f} end
local function apv(...)
for _,x in ipairs({...}) do table.insert(vertices,x) end
end
local function apm(...)
for _,x in ipairs({...}) do table.insert(map,x) end
end
vertices[1] = {0,0, 1}
for n=0,5 do apv(ve(n,1)) end
for n=0,5 do apv(vi(n,0)) end
for n=0,5 do apv(vo(n,0)) end
-- fill area
for n=0,5 do apm(1, 2+n, 2+ix(1+n) ) end
local function ii(n) return 8+ix(n) end
local function oi(n) return 14+ix(n) end
-- outline area
for n=0,5 do
apm( ii(n), oi(n), oi(n+1) )
apm( ii(n), oi(n+1), ii(n+1) )
end
end
local shape_mesh = love.graphics.newMesh({
{"VertexPosition","float",2},
{"fillness","float",1},
},vertices,"triangles","static")
shape_mesh:setVertexMap(map)
local function c(...) return {love.math.colorFromBytes(...)} end
-- taken from breadquest
local colors = {
{0,0,0},
c(255,64,64), -- red
c(255,128,0), -- orange
c(192,192,64), -- yellow
c(0,192,0), -- green
c(0,192,192), -- teal
c(64,64,255), -- blue
c(192,0,192), -- purple
c(128,128,128), -- grey
c(0xe7,0x9e,0), -- ubqorange
}
local shader = love.graphics.newShader([[
#pragma language glsl3
const mat2 hex_to_pos = mat2( sqrt(3), 0, sqrt(3)/2, 1.5);
#define CHUNK_SIZE ]]..tostring(CHUNK_SIZE)..[[.0
uniform vec3 colors[10];
uniform float zoom;
attribute float tile_type;
attribute float fillness;
varying vec4 tcol;
const float zthr0 = 2.7;
const float zthr1 = 6;
const float zthrd = zthr1-zthr0;
vec4 position(mat4 transform_projection, vec4 vertex_position)
{
vec2 instance_pos = vec2(
floor(love_InstanceID/CHUNK_SIZE),
mod(love_InstanceID, CHUNK_SIZE) );
vertex_position.xy += hex_to_pos * instance_pos;
float a = clamp( (zoom-zthr0)/zthrd, 0, 1);
a = max(fillness, a);
int tidx = int(tile_type);
tcol = (tidx == 0) ? vec4(0.0) : vec4(fillness*colors[tidx], a);
return transform_projection * vertex_position;
}
]],[[
#pragma language glsl3
varying vec4 tcol;
vec4 effect(vec4 color, Image tex,
vec2 texture_coords, vec2 screen_coords)
{
// return vec4(tcol.xyz,0.5);
return tcol;
}
]])
shader:send("colors",unpack(colors))
local function set_imesh(im)
shape_mesh:detachAttribute("tile_type")
shape_mesh:attachAttribute("tile_type",im,"perinstance")
end
local function draw_map(camera,map) -- luacheck: no redefined
shader:send("zoom",camera.zoom)
love.graphics.setShader(shader)
local cam_tl,cam_br = camera:extents()
local count = CHUNK_SIZE*CHUNK_SIZE
for _,ch in map:iter_chunks() do
if ch then
-- todo: skip chunks that aren't on screen, maybe
local htl,hbr = ch.cp:extents()
local tl = htl:to_pos()
local br = hbr:to_pos()
if br.x < cam_tl.x or cam_br.x < tl.x
or br.y < cam_tl.y or cam_br.y < tl.y
then
-- definitely not visible on screen
-- this does not catch every single nonvisible chunk
goto next
end
set_imesh(ch.imesh)
love.graphics.drawInstanced(shape_mesh, count, tl.x, tl.y)
end
::next::
end
love.graphics.setShader()
end
return {draw_map=draw_map}
|
