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,
)
bgfx.SetViewRect(0, 0, 0, app.Width, app.Height)
bgfx.Submit(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.Add(bgfx.AttribTexcoord0, 2, bgfx.AttribTypeFloat, true, false)
vd.End()
uTime := bgfx.CreateUniform("u_time", bgfx.Uniform1f, 1)
uMtx := bgfx.CreateUniform("u_mtx", bgfx.Uniform4x4fv, 1)
uLightDir := bgfx.CreateUniform("u_lightDir", bgfx.Uniform3fv, 1)
defer bgfx.DestroyUniform(uTime)
defer bgfx.DestroyUniform(uMtx)
defer bgfx.DestroyUniform(uLightDir)
prog := assets.LoadProgram("vs_raymarching", "fs_raymarching")
defer bgfx.DestroyProgram(prog)
for app.Continue() {
bgfx.DebugTextClear()
bgfx.DebugTextPrintf(0, 1, 0x4f, app.Title)
bgfx.DebugTextPrintf(0, 2, 0x6f, "Description: Updating shader uniforms.")
bgfx.DebugTextPrintf(0, 3, 0x0f, "Frame: % 7.3f[ms]", app.DeltaTime*1000.0)
var (
eye = [3]float32{0, 0, -15.0}
at = [3]float32{0, 0, 0}
up = [3]float32{1, 0, 0}
)
view := mat4.LookAtLH(eye, at, up)
proj := mat4.PerspectiveLH(
cgm.ToRadians(60),
float32(app.Width)/float32(app.Height),
0.1, 100.0,
)
bgfx.SetViewRect(0, 0, 0, app.Width, app.Height)
bgfx.SetViewTransform(0, [16]float32(view), [16]float32(proj))
bgfx.Submit(0)
ortho := mat4.OrthoLH(0, float32(app.Width), float32(app.Height), 0, 0, 100)
bgfx.SetViewRect(1, 0, 0, app.Width, app.Height)
bgfx.SetViewTransform(1, mat4.Identity(), ortho)
viewProj := mat4.Mul(proj, view)
mtx := mat4.RotateXYZ(
cgm.Radians(app.Time),
cgm.Radians(app.Time)*0.37,
0,
)
invMtx := mat4.Inv(mtx)
lightDirModel := [3]float32{-0.4, -0.5, -1.0}
lightDirModelN := vec3.Normal(lightDirModel)
lightDir := mat4.Mul4(invMtx,
[4]float32{
lightDirModelN[0],
lightDirModelN[1],
lightDirModelN[2],
0,
})
invMvp := mat4.Inv(mat4.Mul(viewProj, mtx))
bgfx.SetUniform(uTime, &app.Time, 1)
bgfx.SetUniform(uLightDir, &lightDir, 1)
bgfx.SetUniform(uMtx, &invMvp, 1)
renderScreenSpaceQuad(1, prog, vd, 0, 0, float32(app.Width), float32(app.Height))
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()
}
}