func main() {
app := example.Open()
defer app.Close()
bgfx.Init()
defer bgfx.Shutdown()
bgfx.Reset(app.Width, app.Height, bgfx.ResetVSync)
bgfx.SetDebug(bgfx.DebugText)
bgfx.SetViewClear(
0,
bgfx.ClearColor|bgfx.ClearDepth,
0x303030ff,
1.0,
0,
)
var (
uTexColor = bgfx.CreateUniform("u_texColor", bgfx.Uniform1iv, 1)
uStipple = bgfx.CreateUniform("u_stipple", bgfx.Uniform3fv, 1)
uTexStipple = bgfx.CreateUniform("u_texStipple", bgfx.Uniform1iv, 1)
)
defer bgfx.DestroyUniform(uTexColor)
defer bgfx.DestroyUniform(uStipple)
defer bgfx.DestroyUniform(uTexStipple)
prog := assets.LoadProgram("vs_tree", "fs_tree")
defer bgfx.DestroyProgram(prog)
textureLeafs := assets.LoadTexture("leafs1.dds", 0)
textureBark := assets.LoadTexture("bark1.dds", 0)
defer bgfx.DestroyTexture(textureLeafs)
defer bgfx.DestroyTexture(textureBark)
stippleData := make([]byte, 8*4)
for i, v := range knightTour {
stippleData[(v.Y*8 + v.X)] = byte(i * 4)
}
textureStipple := bgfx.CreateTexture2D(8, 4, 1, bgfx.TextureFormatR8,
bgfx.TextureMinPoint|bgfx.TextureMagPoint, stippleData)
defer bgfx.DestroyTexture(textureStipple)
meshTop := [3]assets.Mesh{
assets.LoadMesh("tree1b_lod0_1"),
assets.LoadMesh("tree1b_lod1_1"),
assets.LoadMesh("tree1b_lod2_1"),
}
meshTrunk := [3]assets.Mesh{
assets.LoadMesh("tree1b_lod0_2"),
assets.LoadMesh("tree1b_lod1_2"),
assets.LoadMesh("tree1b_lod2_2"),
}
for _, m := range meshTop {
defer m.Unload()
}
for _, m := range meshTrunk {
defer m.Unload()
}
var (
stateCommon = bgfx.StateRGBWrite | bgfx.StateAlphaWrite | bgfx.StateDepthTestLess | bgfx.StateCullCCW | bgfx.StateMSAA
stateTransparent = stateCommon | bgfx.StateBlendAlpha()
stateOpaque = stateCommon | bgfx.StateDepthWrite
transitions = true
transitionFrame = 0
currLOD = 0
targetLOD = 0
)
for app.Continue() {
bgfx.SetViewRect(0, 0, 0, app.Width, app.Height)
bgfx.Submit(0)
bgfx.DebugTextClear()
bgfx.DebugTextPrintf(0, 1, 0x4f, app.Title)
bgfx.DebugTextPrintf(0, 2, 0x6f, "Description: Mesh LOD transitions.")
bgfx.DebugTextPrintf(0, 3, 0x0f, "Frame: % 7.3f[ms]", app.DeltaTime*1000.0)
var (
currentLODframe = 32
mainLOD = targetLOD
distance = float32(math.Cos(float64(app.Time))*2 + 4.0)
)
if transitions {
currentLODframe = 32 - transitionFrame
mainLOD = currLOD
}
stipple := [3]float32{
0,
-1,
(float32(currentLODframe) * 4 / 255) - (1.0 / 255),
}
stippleInv := [3]float32{
31.0 * 4 / 255,
1,
(float32(transitionFrame) * 4 / 255) - (1.0 / 255),
}
var (
eye = [3]float32{0, 1, -distance}
at = [3]float32{0, 1, 0}
up = [3]float32{0, 1, 0}
)
view := mat4.LookAtLH(eye, at, up)
proj := mat4.PerspectiveLH(
cgm.ToRadians(60),
float32(app.Width)/float32(app.Height),
0.1, 100,
)
mtx := mat4.Scale(0.1, 0.1, 0.1)
bgfx.SetViewTransform(0, view, proj)
bgfx.SetTexture(0, uTexColor, textureBark)
bgfx.SetTexture(1, uTexStipple, textureStipple)
bgfx.SetUniform(uStipple, &stipple, 1)
meshTrunk[mainLOD].Submit(0, prog, mtx, stateOpaque)
bgfx.SetTexture(0, uTexColor, textureLeafs)
bgfx.SetTexture(1, uTexStipple, textureStipple)
bgfx.SetUniform(uStipple, &stipple, 1)
meshTop[mainLOD].Submit(0, prog, mtx, stateTransparent)
if transitions && transitionFrame != 0 {
bgfx.SetTexture(0, uTexColor, textureBark)
bgfx.SetTexture(1, uTexStipple, textureStipple)
bgfx.SetUniform(uStipple, &stippleInv, 1)
meshTrunk[targetLOD].Submit(0, prog, mtx, stateOpaque)
bgfx.SetTexture(0, uTexColor, textureLeafs)
bgfx.SetTexture(1, uTexStipple, textureStipple)
bgfx.SetUniform(uStipple, &stippleInv, 1)
meshTop[targetLOD].Submit(0, prog, mtx, stateTransparent)
}
lod := 0
if distance > 2.5 {
lod = 1
}
if distance > 5.0 {
lod = 2
}
if targetLOD != lod && targetLOD == currLOD {
targetLOD = lod
}
if currLOD != targetLOD {
transitionFrame++
}
if transitionFrame > 32 {
currLOD = targetLOD
transitionFrame = 0
}
bgfx.Frame()
}
}
func main() {
app := example.Open()
defer app.Close()
bgfx.Init()
defer bgfx.Shutdown()
bgfx.Reset(app.Width, app.Height, 0)
bgfx.SetDebug(bgfx.DebugText)
bgfx.SetViewClear(
0,
bgfx.ClearColor|bgfx.ClearDepth,
0x303030ff,
1.0,
0,
)
var vd bgfx.VertexDecl
vd.Begin()
vd.Add(bgfx.AttribPosition, 3, bgfx.AttribTypeFloat, false, false)
vd.Add(bgfx.AttribColor0, 4, bgfx.AttribTypeUint8, true, false)
vd.End()
vb := bgfx.CreateVertexBuffer(vertices, vd)
defer bgfx.DestroyVertexBuffer(vb)
ib := bgfx.CreateIndexBuffer(indices)
defer bgfx.DestroyIndexBuffer(ib)
prog := assets.LoadProgram("vs_cubes", "fs_cubes")
defer bgfx.DestroyProgram(prog)
var (
avgdt, totaldt float32
nframes int
dim = 12
)
for app.Continue() {
dt := app.DeltaTime
if totaldt >= 1.0 {
avgdt = totaldt / float32(nframes)
if avgdt < 1.0/65 {
dim += 2
} else if avgdt > 1.0/57 && dim > 2 {
dim -= 1
}
totaldt = 0
nframes = 0
}
totaldt += dt
nframes++
var (
eye = [3]float32{0, 0, -35.0}
at = [3]float32{0, 0, 0}
up = [3]float32{0, 1, 0}
)
view := mat4.LookAtLH(eye, at, up)
proj := mat4.PerspectiveLH(
cgm.ToRadians(60),
float32(app.Width)/float32(app.Height),
0.1, 100.0,
)
bgfx.SetViewTransform(0, view, proj)
bgfx.SetViewRect(0, 0, 0, app.Width, app.Height)
bgfx.DebugTextClear()
bgfx.DebugTextPrintf(0, 1, 0x4f, app.Title)
bgfx.DebugTextPrintf(0, 2, 0x6f, "Description: Draw stress, maximizing number of draw calls.")
bgfx.DebugTextPrintf(0, 3, 0x0f, "Frame: % 7.3f[ms]", dt*1000.0)
bgfx.DebugTextPrintf(0, 5, 0x0f, "Draw calls: %d", dim*dim*dim)
bgfx.DebugTextPrintf(0, 6, 0x0f, "Dim: %d", dim)
bgfx.DebugTextPrintf(0, 7, 0x0f, "AvgFrame: % 7.3f[ms]", avgdt*1000.0)
bgfx.Submit(0)
const step = 0.6
pos := [3]float32{
-step * float32(dim) / 2.0,
-step * float32(dim) / 2.0,
-15,
}
for z := 0; z < dim; z++ {
for y := 0; y < dim; y++ {
for x := 0; x < dim; x++ {
mtx := mat4.RotateXYZ(
cgm.Radians(app.Time)+cgm.Radians(x)*0.21,
cgm.Radians(app.Time)+cgm.Radians(y)*0.37,
cgm.Radians(app.Time)+cgm.Radians(z)*0.13,
)
mtx = mat4.Mul(mtx, mat4.Scale(0.25, 0.25, 0.25))
mtx[12] = pos[0] + float32(x)*step
mtx[13] = pos[1] + float32(y)*step
mtx[14] = pos[2] + float32(z)*step
bgfx.SetTransform(mtx)
bgfx.SetProgram(prog)
bgfx.SetVertexBuffer(vb)
bgfx.SetIndexBuffer(ib)
bgfx.SetState(bgfx.StateDefault)
bgfx.Submit(0)
}
}
}
bgfx.Frame()
}
}
