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03-raymarch.lua
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03-raymarch.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 ctx = {
canvas = iup.canvas {},
}
local dlg = iup.dialog {
ctx.canvas,
title = "03-raymarch",
size = "HALFxHALF",
}
local index = { 0,2,1,0,3,2 }
local function renderScreenSpaceQuad(minx, miny, width, height)
ctx.tb:alloc(4, 6, ctx.vdecl)
local zz = 0
local maxx = minx + width
local maxy = miny + height
local minu = -1.0
local minv = -1.0
local maxu = 1
local maxv = 1
ctx.tb:packV(0, minx, miny, zz, 0xff0000ff, minu, minv)
ctx.tb:packV(1, maxx, miny, zz, 0xff00ff00, maxu, minv)
ctx.tb:packV(2, maxx, maxy, zz, 0xffff0000, maxu, maxv)
ctx.tb:packV(3, minx, maxy, zz, 0xffffffff, minu, maxv)
ctx.tb:packI(index)
bgfx.set_state() -- default
ctx.tb:set()
bgfx.submit(1, ctx.prog)
end
local time = 0
local function mainloop()
math3d.reset()
bgfx.touch(0)
time = time + 0.01
local vp = math3d.mul(ctx.projmat, ctx.viewmat)
local mtx = math3d.matrix { r = { time , time * 0.37, 0 } }
local lightDirModelN = math3d.normalize(math3d.vector (-0.4, -0.5, -1.0))
local lightDirTime = math3d.transform(math3d.inverse(mtx) , lightDirModelN, 0)
bgfx.set_uniform(ctx.u_lightDirTime, math3d.vector(lightDirTime, time)) -- lightDirTime[4] = time
-- local command = bgfx.set_uniform_command(ctx.u_lightDirTime, math3d.vector(lightDirTime, time))
local invMvp = math3d.inverse(math3d.mul(vp, mtx))
bgfx.set_uniform(ctx.u_mtx, invMvp)
-- command = command .. bgfx.set_uniform_command(ctx.u_mtx, invMvp)
-- bgfx.execute_setter(command)
renderScreenSpaceQuad(0.0, 0.0, 1280.0, 720.0)
bgfx.frame()
end
function ctx.init()
bgfx.set_view_clear(0, "CD", 0x303030ff, 1, 0)
ctx.prog = util.programLoad("vs_raymarching", "fs_raymarching")
ctx.vdecl = bgfx.vertex_layout {
{ "POSITION", 3, "FLOAT" },
{ "COLOR0", 4, "UINT8", true },
{ "TEXCOORD0", 2, "FLOAT" },
}
ctx.u_mtx = bgfx.create_uniform("u_mtx", "m4")
ctx.u_lightDirTime = bgfx.create_uniform("u_lightDirTime", "v4")
ctx.tb = bgfx.transient_buffer "fffdff"
ctx.viewmat = math3d.ref(math3d.matrix())
ctx.projmat = math3d.ref(math3d.matrix())
end
function ctx.resize(w,h)
ctx.width = w
ctx.height = h
bgfx.set_view_rect(0, 0, 0, w, h)
bgfx.set_view_rect(1, 0, 0, w, h)
bgfx.reset(w,h, "v")
ctx.viewmat.mat = math3d.lookat( {0,0,-15}, {0, 0, 0} )
ctx.projmat.mat = math3d.projmat { fov = 60, aspect = w/h , n = 0.1, f = 100 }
bgfx.set_view_transform(0, ctx.viewmat, ctx.projmat)
local orthomat = math3d.projmat { ortho = true, l = 0.0, r= 1280.0, b = 720.0, t = 0.0, n = 0.0, f = 100.0 }
bgfx.set_view_transform(1, nil, orthomat)
end
util.init(ctx)
dlg:showxy(iup.CENTER,iup.CENTER)
dlg.usersize = nil
util.run(mainloop)
--bgfx.destroy(ctx.prog)
--bgfx.destroy(ctx.u_mtx)
--bgfx.destroy(ctx.u_lightDirTime)