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26-occlusion.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 CUBES_DIM = 10
local ctx = {
canvas = iup.canvas {},
}
local dlg = iup.dialog {
ctx.canvas,
title = "26-occlusion",
size = "HALFxHALF",
}
local time = 0
local function mainloop()
math3d.reset()
bgfx.touch(0)
bgfx.touch(2)
time = time + 0.001
local img = {}
local offset = -(CUBES_DIM-1) * 3.0 / 2.0
for yy = 0, CUBES_DIM-1 do
for xx = 0, CUBES_DIM-1 do
local mtx = math3d.matrix { r = { time + xx*0.21 , time + yy*0.37, 0 },t = {offset + xx*3, 0, offset + yy*3} }
local occlusionQuery = ctx.m_occlusionQueries[yy*CUBES_DIM+xx+1]
bgfx.set_transform(mtx)
bgfx.set_vertex_buffer(0,ctx.vb)
bgfx.set_index_buffer(ctx.ib)
bgfx.set_condition(occlusionQuery, true)
bgfx.set_state() -- default
bgfx.submit(0, ctx.m_program)
bgfx.set_transform(mtx)
bgfx.set_vertex_buffer(0,ctx.vb)
bgfx.set_index_buffer(ctx.ib)
bgfx.set_state(ctx.test_state)
bgfx.submit_occlusion_query(1, ctx.m_program, occlusionQuery)
bgfx.set_transform(mtx)
bgfx.set_vertex_buffer(0,ctx.vb)
bgfx.set_index_buffer(ctx.ib)
bgfx.set_condition(occlusionQuery, true)
bgfx.set_state() -- default
bgfx.submit(2, ctx.m_program)
local r = bgfx.get_result(occlusionQuery)
if r then
table.insert(img, "\xfe\x0f")
elseif r == false then
table.insert(img, " \x0f")
else
table.insert(img, "x\x0f")
end
end
end
bgfx.dbg_text_clear()
bgfx.dbg_text_image(5,5,CUBES_DIM,CUBES_DIM,table.concat(img))
local _, num = bgfx.get_result(ctx.m_occlusionQueries[1])
bgfx.dbg_text_print(5, 5 + CUBES_DIM + 1, 0xf, tostring(num))
bgfx.frame()
end
function ctx.init()
bgfx.set_view_clear(0, "CD", 0x303030ff, 1, 0)
bgfx.set_view_clear(2, "CD", 0x202020ff, 1, 0)
bgfx.set_debug "T"
ctx.m_program = util.programLoad("vs_cubes", "fs_cubes")
ctx.VertexDecl = bgfx.vertex_layout {
{ "POSITION", 3, "FLOAT" },
{ "COLOR0", 4, "UINT8", true },
}
ctx.vb = bgfx.create_vertex_buffer(bgfx.memory_buffer("fffd", {
-1.0, 1.0, 1.0, 0xff000000,
1.0, 1.0, 1.0, 0xff0000ff,
-1.0, -1.0, 1.0, 0xff00ff00,
1.0, -1.0, 1.0, 0xff00ffff,
-1.0, 1.0, -1.0, 0xffff0000,
1.0, 1.0, -1.0, 0xffff00ff,
-1.0, -1.0, -1.0, 0xffffff00,
1.0, -1.0, -1.0, 0xffffffff,
}), ctx.VertexDecl)
ctx.ib = bgfx.create_index_buffer{
0, 1, 2, -- 0
1, 3, 2,
4, 6, 5, -- 2
5, 6, 7,
0, 2, 4, -- 4
4, 2, 6,
1, 5, 3, -- 6
5, 7, 3,
0, 4, 1, -- 8
4, 5, 1,
2, 3, 6, -- 10
6, 3, 7,
}
assert(util.caps.supported.OCCLUSION_QUERY)
ctx.m_occlusionQueries = {}
for i = 1, CUBES_DIM*CUBES_DIM do
ctx.m_occlusionQueries[i] = bgfx.create_occlusion_query()
end
ctx.test_state = bgfx.make_state {
DEPTH_TEST = "LEQUAL",
CULL = "CW",
}
end
function ctx.resize(w,h)
ctx.width = w
ctx.height = h
bgfx.reset(ctx.width,ctx.height, "v")
local viewmat = math3d.lookat ( { 0,0,-35} , { 0,0,0 } )
local projmat = math3d.projmat { fov = 90, aspect = w/h, n = 0.1, f = 10000 }
local view2 = math3d.lookat( { 17.5, 10, -17.5 }, { 0,0,0 } )
bgfx.set_view_rect(0, 0, 0, ctx.width, ctx.height)
bgfx.set_view_transform(0, viewmat, projmat)
bgfx.set_view_rect(1, 0, 0, ctx.width, ctx.height)
bgfx.set_view_transform(1, viewmat, projmat)
bgfx.set_view_transform(2, view2, projmat)
bgfx.set_view_rect(2, 10, (h * 3//4 - 10), w//4, h//4)
end
util.init(ctx)
dlg:showxy(iup.CENTER,iup.CENTER)
dlg.usersize = nil
util.run(mainloop)