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12-lod.lua
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package.cpath = "bin/?.dll"
local iup = require "iuplua"
local bgfx = require "bgfx"
local util = require "util"
local math3d = require "math3d"
local settings = {
distance = 2.0,
transitions = true,
}
local function slider(name, title, min, max)
local value = assert(settings[name])
local label = iup.label { title = tostring(value) }
local function update_value(self)
local v = tonumber(self.value)
settings[name] = v
label.title = string.format("%.2f",v)
end
local s = iup.frame {
iup.hbox {
iup.val {
"HORIZONTAL";
min = min,
max = max,
value = value,
valuechanged_cb = update_value,
},
label
},
title = title,
}
return s
end
local ctx = {
canvas = iup.canvas {},
}
local ctrl = iup.frame {
iup.vbox {
slider("distance", "Distance", 2, 6),
iup.toggle {
title = "transitions",
value = "ON",
action = function(self, v)
settings.transitions = (v == 1)
end,
},
},
title = "Settings",
size = "60",
}
local dlg = iup.dialog {
iup.hbox {
iup.vbox {
ctrl,
margin = "10x10",
},
ctx.canvas,
},
title = "12-lod",
size = "HALFxHALF",
}
local function mainloop()
math3d.reset()
bgfx.touch(0)
local view = math3d.lookat( {0,2, - settings.distance}, {0,1,0})
bgfx.set_view_transform(0, view, ctx.proj)
local mtx = math3d.matrix { s = 0.1 }
local currentLODframe = settings.transitions and (32- ctx.m_transitionFrame) or 32
local mainLOD = settings.transitions and ctx.m_currLod or ctx.m_targetLod
local stipple = math3d.vector ( 0, -1, currentLODframe * 4 / 255 - 1/255, 0 )
local stippleInv = math3d.vector ( 31 * 4 /255, 1, ctx.m_transitionFrame * 4/255 - 1/255, 0 )
bgfx.set_texture(0, ctx.s_texColor, ctx.m_textureBark)
bgfx.set_texture(1, ctx.s_texStipple, ctx.m_textureStipple)
bgfx.set_uniform(ctx.u_stipple, stipple)
bgfx.set_state(ctx.stateOpaque)
bgfx.set_transform(mtx)
util.meshSubmit(ctx.m_meshTrunk[mainLOD], 0, ctx.m_program)
bgfx.set_texture(0, ctx.s_texColor, ctx.m_textureLeafs)
bgfx.set_texture(1, ctx.s_texStipple, ctx.m_textureStipple)
bgfx.set_uniform(ctx.u_stipple, stipple)
bgfx.set_state(ctx.stateTransparent)
bgfx.set_transform(mtx)
util.meshSubmit(ctx.m_meshTop[mainLOD], 0, ctx.m_program)
if settings.transitions and m_transitionFrame ~= 0 then
bgfx.set_texture(0, ctx.s_texColor, ctx.m_textureBark)
bgfx.set_texture(1, ctx.s_texStipple, ctx.m_textureStipple)
bgfx.set_uniform(ctx.u_stipple, stippleInv)
bgfx.set_state(ctx.stateOpaque)
bgfx.set_transform(mtx)
util.meshSubmit(ctx.m_meshTrunk[ctx.m_targetLod], 0, ctx.m_program)
bgfx.set_texture(0, ctx.s_texColor, ctx.m_textureLeafs)
bgfx.set_texture(1, ctx.s_texStipple, ctx.m_textureStipple)
bgfx.set_uniform(ctx.u_stipple, stippleInv)
bgfx.set_state(ctx.stateTransparent)
bgfx.set_transform(mtx)
util.meshSubmit(ctx.m_meshTop[ctx.m_targetLod], 0, ctx.m_program)
end
local lod = 1
if settings.distance > 2.5 then
lod = 2
end
if settings.distance > 5 then
lod = 3
end
if ctx.m_targetLod ~= lod then
if ctx.m_targetLod == ctx.m_currLod then
ctx.m_targetLod = lod
end
end
if ctx.m_currLod ~= ctx.m_targetLod then
ctx.m_transitionFrame = ctx.m_transitionFrame + 1
end
if ctx.m_transitionFrame > 32 then
ctx.m_currLod = ctx.m_targetLod
ctx.m_transitionFrame = 0
end
bgfx.frame()
end
function ctx.init()
ctx.stateOpaque = nil -- default
ctx.stateTransparent = bgfx.make_state {
WRITE_MASK = "RGBA",
DEPTH_TEST = "LESS",
MSAA = true,
CULL = "CCW",
BLEND = "ALPHA",
}
bgfx.set_view_clear(0, "CD", 0x303030ff, 1, 0)
ctx.s_texColor = bgfx.create_uniform("s_texColor", "s")
ctx.s_texStipple = bgfx.create_uniform("s_texStipple", "s")
ctx.u_stipple = bgfx.create_uniform("u_stipple", "v4")
ctx.m_program = util.programLoad("vs_tree", "fs_tree")
ctx.m_textureLeafs = util.textureLoad "textures/leafs1.dds"
ctx.m_textureBark = util.textureLoad "textures/bark1.dds"
local knightTour = {
{0,0}, {1,2}, {3,3}, {4,1}, {5,3}, {7,2}, {6,0}, {5,2},
{7,3}, {6,1}, {4,0}, {3,2}, {2,0}, {0,1}, {1,3}, {2,1},
{0,2}, {1,0}, {2,2}, {0,3}, {1,1}, {3,0}, {4,2}, {5,0},
{7,1}, {6,3}, {5,1}, {7,0}, {6,2}, {4,3}, {3,1}, {2,3},
}
local tmp = {}
for ii=1,32 do
local p = knightTour[ii]
tmp[p[2] * 8 + p[1]+1] = ii*4-4
end
ctx.m_textureStipple = bgfx.create_texture2d(8,4,false,1,"R8","+p-p",string.char(table.unpack(tmp)))
ctx.m_meshTop = {
util.meshLoad "meshes/tree1b_lod0_1.bin",
util.meshLoad "meshes/tree1b_lod1_1.bin",
util.meshLoad "meshes/tree1b_lod2_1.bin",
}
ctx.m_meshTrunk = {
util.meshLoad "meshes/tree1b_lod0_2.bin",
util.meshLoad "meshes/tree1b_lod1_2.bin",
util.meshLoad "meshes/tree1b_lod2_2.bin",
}
ctx.m_scrollArea = 0
ctx.m_transitionFrame = 0
ctx.m_currLod = 1
ctx.m_targetLod = 1
end
function ctx.resize(w,h)
ctx.width = w
ctx.height = h
bgfx.reset(w,h, "v")
bgfx.set_view_rect(0, 0, 0, w, h)
ctx.proj = math3d.ref( math3d.projmat { fov = 60, aspect = w/h , n = 0.1, f = 100 } )
end
util.init(ctx)
dlg:showxy(iup.CENTER,iup.CENTER)
dlg.usersize = nil
util.run(mainloop)