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,
)
uTime := bgfx.CreateUniform("u_time", bgfx.Uniform1f, 1)
defer bgfx.DestroyUniform(uTime)
prog := assets.LoadProgram("vs_mesh", "fs_mesh")
defer bgfx.DestroyProgram(prog)
mesh := assets.LoadMesh("bunny")
defer mesh.Unload()
for app.Continue() {
bgfx.SetViewRect(0, 0, 0, app.Width, app.Height)
bgfx.DebugTextClear()
bgfx.DebugTextPrintf(0, 1, 0x4f, app.Title)
bgfx.DebugTextPrintf(0, 2, 0x6f, "Description: Loading meshes.")
bgfx.DebugTextPrintf(0, 3, 0x0f, "Frame: % 7.3f[ms]", app.DeltaTime*1000.0)
bgfx.Submit(0)
bgfx.SetUniform(uTime, &app.Time, 1)
var (
eye = [3]float32{0, 1, -2.5}
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,
)
bgfx.SetViewTransform(0, view, proj)
mtx := mat4.RotateXYZ(0, cgm.Radians(app.Time)*0.37, 0)
mesh.Submit(0, prog, mtx, 0)
bgfx.Frame()
}
}
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,
)
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: Initialization and debug text.")
bgfx.Frame()
}
}
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 vd bgfx.VertexDecl
vd.Begin()
vd.Add(bgfx.AttribPosition, 3, bgfx.AttribTypeFloat, false, false)
vd.Add(bgfx.AttribNormal, 3, bgfx.AttribTypeFloat, false, false)
vd.Add(bgfx.AttribColor0, 4, bgfx.AttribTypeUint8, true, false)
vd.End()
vsh := bgfx.CreateShader(vs_metaballs_glsl)
fsh := bgfx.CreateShader(fs_metaballs_glsl)
prog := bgfx.CreateProgram(vsh, fsh, true)
defer bgfx.DestroyProgram(prog)
const dim = 32
const ypitch = dim
const zpitch = dim * dim
const invdim = 1.0 / (dim - 1)
var grid [dim * dim * dim]cell
for app.Continue() {
var (
eye = [3]float32{0, 0, -50.0}
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,
)
bgfx.SetViewTransform(0, view, proj)
bgfx.SetViewRect(0, 0, 0, app.Width, app.Height)
bgfx.Submit(0)
// 32k vertices
const maxVertices = (32 << 10)
var vertices []PosNormalColorVertex
tvb := bgfx.AllocTransientVertexBuffer(&vertices, maxVertices, vd)
const numSpheres = 16
var spheres [numSpheres][4]float32
for i := 0; i < numSpheres; i++ {
x := float64(i)
t := float64(app.Time)
spheres[i][0] = float32(math.Sin(t*(x*0.21)+x*0.37) * (dim*0.5 - 8.0))
spheres[i][1] = float32(math.Sin(t*(x*0.37)+x*0.67) * (dim*0.5 - 8.0))
spheres[i][2] = float32(math.Cos(t*(x*0.11)+x*0.13) * (dim*0.5 - 8.0))
spheres[i][3] = 1.0 / (2.0 + float32(math.Sin(t*(x*0.13))*0.5+0.5)*2.0)
}
profUpdate := app.HighFreqTime()
for z := 0; z < dim; z++ {
fz := float32(z)
for y := 0; y < dim; y++ {
fy := float32(y)
offset := (z*dim + y) * dim
for x := 0; x < dim; x++ {
var (
fx = float32(x)
dist float32
prod float32 = 1.0
xoffset = offset + x
)
for i := 0; i < numSpheres; i++ {
pos := &spheres[i]
dx := pos[0] - (-dim*0.5 + fx)
dy := pos[1] - (-dim*0.5 + fy)
dz := pos[2] - (-dim*0.5 + fz)
invr := pos[3]
dot := dx*dx + dy*dy + dz*dz
dot *= invr * invr
dist *= dot
dist += prod
prod *= dot
}
grid[xoffset].val = dist/prod - 1.0
}
}
}
profUpdate = app.HighFreqTime() - profUpdate
profNormal := app.HighFreqTime()
for z := 1; z < dim-1; z++ {
for y := 1; y < dim-1; y++ {
offset := (z*dim + y) * dim
for x := 1; x < dim-1; x++ {
xoffset := offset + x
grid[xoffset].normal = vec3.Normal([3]float32{
grid[xoffset-1].val - grid[xoffset+1].val,
grid[xoffset-ypitch].val - grid[xoffset+ypitch].val,
grid[xoffset-zpitch].val - grid[xoffset+zpitch].val,
})
}
}
}
profNormal = app.HighFreqTime() - profNormal
profTriangulate := app.HighFreqTime()
numVertices := 0
for z := 0; z < dim-1 && numVertices+12 < maxVertices; z++ {
var (
rgb [6]float32
pos [3]float32
val [8]*cell
)
rgb[2] = float32(z) * invdim
rgb[5] = float32(z+1) * invdim
for y := 0; y < dim-1 && numVertices+12 < maxVertices; y++ {
offset := (z*dim + y) * dim
rgb[1] = float32(y) * invdim
rgb[4] = float32(y+1) * invdim
for x := 0; x < dim-1 && numVertices+12 < maxVertices; x++ {
xoffset := offset + x
rgb[0] = float32(x) * invdim
rgb[3] = float32(x+1) * invdim
pos[0] = -dim*0.5 + float32(x)
pos[1] = -dim*0.5 + float32(y)
pos[2] = -dim*0.5 + float32(z)
val[0] = &grid[xoffset+zpitch+ypitch]
val[1] = &grid[xoffset+zpitch+ypitch+1]
val[2] = &grid[xoffset+ypitch+1]
val[3] = &grid[xoffset+ypitch]
val[4] = &grid[xoffset+zpitch]
val[5] = &grid[xoffset+zpitch+1]
val[6] = &grid[xoffset+1]
val[7] = &grid[xoffset]
num := triangulate(vertices[numVertices:], rgb[:], pos[:], val[:], 0.5)
numVertices += num
}
}
}
profTriangulate = app.HighFreqTime() - profTriangulate
bgfx.DebugTextClear()
bgfx.DebugTextPrintf(0, 1, 0x4f, app.Title)
bgfx.DebugTextPrintf(0, 2, 0x6f, "Description: Rendering with transient buffers and embedded shaders.")
bgfx.DebugTextPrintf(0, 4, 0x0f, " Vertices: %d (%.2f%%)", numVertices, float32(numVertices*100)/maxVertices)
bgfx.DebugTextPrintf(0, 5, 0x0f, " Update: % 7.3f[ms]", profUpdate*1000.0)
bgfx.DebugTextPrintf(0, 6, 0x0f, "Calc normals: % 7.3f[ms]", profNormal*1000.0)
bgfx.DebugTextPrintf(0, 7, 0x0f, " Triangulate: % 7.3f[ms]", profTriangulate*1000.0)
bgfx.DebugTextPrintf(0, 8, 0x0f, " Frame: % 7.3f[ms]", app.DeltaTime*1000.0)
mtx := mat4.RotateXYZ(
cgm.Radians(app.Time)*0.67,
cgm.Radians(app.Time),
0,
)
bgfx.SetTransform(mtx)
bgfx.SetProgram(prog)
bgfx.SetTransientVertexBuffer(tvb, 0, numVertices)
bgfx.SetState(bgfx.StateDefault)
bgfx.Submit(0)
bgfx.Frame()
}
}
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,
)
caps := bgfx.Caps()
originBottomLeft := false
switch caps.RendererType {
case bgfx.RendererTypeDirect3D9:
texelHalf = 0.5
case bgfx.RendererTypeOpenGL, bgfx.RendererTypeOpenGLES:
originBottomLeft = true
}
var decl bgfx.VertexDecl
decl.Begin()
decl.Add(bgfx.AttribPosition, 3, bgfx.AttribTypeFloat, false, false)
decl.Add(bgfx.AttribColor0, 4, bgfx.AttribTypeUint8, true, false)
decl.Add(bgfx.AttribTexcoord0, 2, bgfx.AttribTypeFloat, false, false)
decl.End()
var (
skyProg = assets.LoadProgram("vs_hdr_skybox", "fs_hdr_skybox")
lumProg = assets.LoadProgram("vs_hdr_lum", "fs_hdr_lum")
lumAvgProg = assets.LoadProgram("vs_hdr_lumavg", "fs_hdr_lumavg")
blurProg = assets.LoadProgram("vs_hdr_blur", "fs_hdr_blur")
brightProg = assets.LoadProgram("vs_hdr_bright", "fs_hdr_bright")
meshProg = assets.LoadProgram("vs_hdr_mesh", "fs_hdr_mesh")
tonemapProg = assets.LoadProgram("vs_hdr_tonemap", "fs_hdr_tonemap")
)
defer bgfx.DestroyProgram(skyProg)
defer bgfx.DestroyProgram(lumProg)
defer bgfx.DestroyProgram(lumAvgProg)
defer bgfx.DestroyProgram(blurProg)
defer bgfx.DestroyProgram(brightProg)
defer bgfx.DestroyProgram(meshProg)
defer bgfx.DestroyProgram(tonemapProg)
var (
uTime = bgfx.CreateUniform("u_time", bgfx.Uniform1f, 1)
uTexCube = bgfx.CreateUniform("u_texCube", bgfx.Uniform1i, 1)
uTexColor = bgfx.CreateUniform("u_texColor", bgfx.Uniform1i, 1)
uTexLum = bgfx.CreateUniform("u_texLum", bgfx.Uniform1i, 1)
uTexBlur = bgfx.CreateUniform("u_texBlur", bgfx.Uniform1i, 1)
uMtx = bgfx.CreateUniform("u_mtx", bgfx.Uniform4x4fv, 1)
uTonemap = bgfx.CreateUniform("u_tonemap", bgfx.Uniform4fv, 1)
uOffset = bgfx.CreateUniform("u_offset", bgfx.Uniform4fv, 16)
)
defer bgfx.DestroyUniform(uTime)
defer bgfx.DestroyUniform(uTexCube)
defer bgfx.DestroyUniform(uTexColor)
defer bgfx.DestroyUniform(uTexLum)
defer bgfx.DestroyUniform(uTexBlur)
defer bgfx.DestroyUniform(uMtx)
defer bgfx.DestroyUniform(uTonemap)
defer bgfx.DestroyUniform(uOffset)
mesh := assets.LoadMesh("bunny")
defer mesh.Unload()
uffizi := assets.LoadTexture("uffizi.dds", bgfx.TextureUClamp|bgfx.TextureVClamp|bgfx.TextureWClamp)
defer bgfx.DestroyTexture(uffizi)
fbtextures := []bgfx.Texture{
bgfx.CreateTexture2D(app.Width, app.Height, 1, bgfx.TextureFormatBGRA8, bgfx.TextureRT|bgfx.TextureUClamp|bgfx.TextureVClamp, nil),
bgfx.CreateTexture2D(app.Width, app.Height, 1, bgfx.TextureFormatD16, bgfx.TextureRTBufferOnly, nil),
}
fb := bgfx.CreateFrameBufferFromTextures(fbtextures, true)
lum := [5]bgfx.FrameBuffer{
bgfx.CreateFrameBuffer(128, 128, bgfx.TextureFormatBGRA8, 0),
bgfx.CreateFrameBuffer(64, 64, bgfx.TextureFormatBGRA8, 0),
bgfx.CreateFrameBuffer(16, 16, bgfx.TextureFormatBGRA8, 0),
bgfx.CreateFrameBuffer(4, 4, bgfx.TextureFormatBGRA8, 0),
bgfx.CreateFrameBuffer(1, 1, bgfx.TextureFormatBGRA8, 0),
}
bright := bgfx.CreateFrameBuffer(app.Width/2, app.Height/2, bgfx.TextureFormatBGRA8, 0)
blur := bgfx.CreateFrameBuffer(app.Width/8, app.Height/8, bgfx.TextureFormatBGRA8, 0)
// defer in closure to capture these by reference since we destroy
// and recreate these when the window resizes.
defer func() {
for _, l := range lum {
bgfx.DestroyFrameBuffer(l)
}
bgfx.DestroyFrameBuffer(fb)
bgfx.DestroyFrameBuffer(bright)
bgfx.DestroyFrameBuffer(blur)
}()
const (
speed = 0.37
middleGray = 0.18
white = 1.1
threshold = 1.5
)
var (
prevWidth = app.Width
prevHeight = app.Height
)
for app.Continue() {
if prevWidth != app.Width || prevHeight != app.Height {
prevWidth = app.Width
prevHeight = app.Height
bgfx.DestroyFrameBuffer(fb)
bgfx.DestroyFrameBuffer(blur)
bgfx.DestroyFrameBuffer(bright)
fbtextures[0] = bgfx.CreateTexture2D(app.Width, app.Height, 1, bgfx.TextureFormatBGRA8, bgfx.TextureRT|bgfx.TextureUClamp|bgfx.TextureVClamp, nil)
fbtextures[1] = bgfx.CreateTexture2D(app.Width, app.Height, 1, bgfx.TextureFormatD16, bgfx.TextureRTBufferOnly, nil)
fb = bgfx.CreateFrameBufferFromTextures(fbtextures, true)
bright = bgfx.CreateFrameBuffer(app.Width/2, app.Height/2, bgfx.TextureFormatBGRA8, 0)
blur = bgfx.CreateFrameBuffer(app.Width/8, app.Height/8, bgfx.TextureFormatBGRA8, 0)
}
bgfx.DebugTextClear()
bgfx.DebugTextPrintf(0, 1, 0x4f, app.Title)
bgfx.DebugTextPrintf(0, 2, 0x6f, "Description: Using multiple views and render targets.")
bgfx.DebugTextPrintf(0, 3, 0x0f, "Frame: % 7.3f[ms]", app.DeltaTime*1000.0)
bgfx.SetUniform(uTime, &app.Time, 1)
for i := 0; i < 6; i++ {
bgfx.SetViewRect(bgfx.ViewID(i), 0, 0, app.Width, app.Height)
}
bgfx.SetViewFrameBuffer(0, fb)
bgfx.SetViewFrameBuffer(1, fb)
bgfx.SetViewRect(2, 0, 0, 128, 128)
bgfx.SetViewFrameBuffer(2, lum[0])
bgfx.SetViewRect(3, 0, 0, 64, 64)
bgfx.SetViewFrameBuffer(3, lum[1])
bgfx.SetViewRect(4, 0, 0, 16, 16)
bgfx.SetViewFrameBuffer(4, lum[2])
bgfx.SetViewRect(5, 0, 0, 4, 4)
bgfx.SetViewFrameBuffer(5, lum[3])
bgfx.SetViewRect(6, 0, 0, 1, 1)
bgfx.SetViewFrameBuffer(6, lum[4])
bgfx.SetViewRect(7, 0, 0, app.Width/2, app.Height/2)
bgfx.SetViewFrameBuffer(7, bright)
bgfx.SetViewRect(8, 0, 0, app.Width/8, app.Height/8)
bgfx.SetViewFrameBuffer(8, blur)
bgfx.SetViewRect(9, 0, 0, app.Width, app.Height)
view := mat4.Identity()
proj := mat4.OrthoLH(0, 1, 1, 0, 0, 100)
for i := 0; i < 10; i++ {
bgfx.SetViewTransform(bgfx.ViewID(i), view, proj)
}
var (
eye = [3]float32{0, 1, -2.5}
at = [3]float32{0, 1, 0}
up = [3]float32{0, 1, 0}
mtx = mat4.RotateXYZ(0, cgm.Radians(app.Time)*0.37, 0)
)
eye = mat4.Mul3(mtx, eye)
view = mat4.LookAtLH(eye, at, up)
proj = mat4.PerspectiveLH(
cgm.ToRadians(60),
float32(app.Width)/float32(app.Height),
0.1, 100,
)
bgfx.SetViewTransform(1, view, proj)
bgfx.SetUniform(uMtx, &mtx, 1)
// Render skybox into view 0
bgfx.SetTexture(0, uTexCube, uffizi)
bgfx.SetProgram(skyProg)
bgfx.SetState(bgfx.StateRGBWrite | bgfx.StateAlphaWrite)
screenSpaceQuad(decl, float32(app.Width), float32(app.Height), true)
bgfx.Submit(0)
// Render mesh into view 1
bgfx.SetTexture(0, uTexCube, uffizi)
mesh.Submit(1, meshProg, mat4.Identity(), 0)
// Calculate luminance.
setOffsets2x2Lum(uOffset, 128, 128)
bgfx.SetTexture(0, uTexColor, fbtextures[0])
bgfx.SetProgram(lumProg)
bgfx.SetState(bgfx.StateRGBWrite | bgfx.StateAlphaWrite)
screenSpaceQuad(decl, 128, 128, originBottomLeft)
bgfx.Submit(2)
// Downscale luminance 0.
setOffsets4x4Lum(uOffset, 128, 128)
bgfx.SetTextureFromFrameBuffer(0, uTexColor, lum[0])
bgfx.SetProgram(lumAvgProg)
bgfx.SetState(bgfx.StateRGBWrite | bgfx.StateAlphaWrite)
screenSpaceQuad(decl, 64, 64, originBottomLeft)
bgfx.Submit(3)
// Downscale luminance 1.
setOffsets4x4Lum(uOffset, 64, 64)
bgfx.SetTextureFromFrameBuffer(0, uTexColor, lum[1])
bgfx.SetProgram(lumAvgProg)
bgfx.SetState(bgfx.StateRGBWrite | bgfx.StateAlphaWrite)
screenSpaceQuad(decl, 16, 16, originBottomLeft)
bgfx.Submit(4)
// Downscale luminance 2.
setOffsets4x4Lum(uOffset, 16, 16)
bgfx.SetTextureFromFrameBuffer(0, uTexColor, lum[2])
bgfx.SetProgram(lumAvgProg)
bgfx.SetState(bgfx.StateRGBWrite | bgfx.StateAlphaWrite)
screenSpaceQuad(decl, 4, 4, originBottomLeft)
bgfx.Submit(5)
// Downscale luminance 3.
setOffsets4x4Lum(uOffset, 4, 4)
bgfx.SetTextureFromFrameBuffer(0, uTexColor, lum[3])
bgfx.SetProgram(lumAvgProg)
bgfx.SetState(bgfx.StateRGBWrite | bgfx.StateAlphaWrite)
screenSpaceQuad(decl, 1, 1, originBottomLeft)
bgfx.Submit(6)
tonemap := [4]float32{middleGray, white * white, threshold, 0}
bgfx.SetUniform(uTonemap, &tonemap, 1)
// Bright pass threshold is tonemap[3]
setOffsets4x4Lum(uOffset, app.Width/2, app.Height/2)
bgfx.SetTexture(0, uTexColor, fbtextures[0])
bgfx.SetTextureFromFrameBuffer(1, uTexLum, lum[4])
bgfx.SetProgram(brightProg)
bgfx.SetState(bgfx.StateRGBWrite | bgfx.StateAlphaWrite)
screenSpaceQuad(decl, float32(app.Width/2), float32(app.Height/2), originBottomLeft)
bgfx.Submit(7)
// Blur pass vertically
bgfx.SetTextureFromFrameBuffer(0, uTexColor, bright)
bgfx.SetProgram(blurProg)
bgfx.SetState(bgfx.StateRGBWrite | bgfx.StateAlphaWrite)
screenSpaceQuad(decl, float32(app.Width/8), float32(app.Height/8), originBottomLeft)
bgfx.Submit(8)
// Blur pass horizontally, do tonemapping and combine.
bgfx.SetTexture(0, uTexColor, fbtextures[0])
bgfx.SetTextureFromFrameBuffer(1, uTexLum, lum[4])
bgfx.SetTextureFromFrameBuffer(2, uTexBlur, blur)
bgfx.SetProgram(tonemapProg)
bgfx.SetState(bgfx.StateRGBWrite | bgfx.StateAlphaWrite)
screenSpaceQuad(decl, float32(app.Width), float32(app.Height), originBottomLeft)
bgfx.Submit(9)
bgfx.Frame()
}
}
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 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)
for app.Continue() {
t := app.Time
dt := app.DeltaTime
var (
eye = [3]float32{0, 0, -35.0}
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,
)
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: Rendering simple static mesh.")
bgfx.DebugTextPrintf(0, 3, 0x0f, "Frame: % 7.3f[ms]", dt*1000.0)
bgfx.Submit(0)
// Submit 11x11 cubes
for y := 0; y < 11; y++ {
for x := 0; x < 11; x++ {
mtx := mat4.RotateXYZ(
cgm.Radians(t)+cgm.Radians(x)*0.21,
cgm.Radians(t)+cgm.Radians(y)*0.37,
0,
)
mtx[12] = -15 + float32(x)*3
mtx[13] = -15 + float32(y)*3
mtx[14] = 0
bgfx.SetTransform(mtx)
bgfx.SetProgram(prog)
bgfx.SetVertexBuffer(vb)
bgfx.SetIndexBuffer(ib)
bgfx.SetState(bgfx.StateDefault)
bgfx.Submit(0)
}
}
bgfx.Frame()
}
}
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,
)
instancingSupported := bgfx.Caps().Supported&bgfx.CapsInstancing != 0
var vd bgfx.VertexDecl
vd.Begin()
vd.Add(bgfx.AttribPosition, 3, bgfx.AttribTypeFloat, false, false)
vd.Add(bgfx.AttribNormal, 4, bgfx.AttribTypeUint8, true, true)
vd.Add(bgfx.AttribTangent, 4, bgfx.AttribTypeUint8, true, true)
vd.Add(bgfx.AttribTexcoord0, 2, bgfx.AttribTypeInt16, true, true)
vd.End()
example.CalculateTangents(vertices, len(vertices), vd, indices)
vb := bgfx.CreateVertexBuffer(vertices, vd)
defer bgfx.DestroyVertexBuffer(vb)
ib := bgfx.CreateIndexBuffer(indices)
defer bgfx.DestroyIndexBuffer(ib)
const numLights = 4
uTexColor := bgfx.CreateUniform("u_texColor", bgfx.Uniform1iv, 1)
uTexNormal := bgfx.CreateUniform("u_texNormal", bgfx.Uniform1iv, 1)
uLightPosRadius := bgfx.CreateUniform("u_lightPosRadius", bgfx.Uniform4fv, numLights)
uLightRgbInnerR := bgfx.CreateUniform("u_lightRgbInnerR", bgfx.Uniform4fv, numLights)
vsbump := "vs_bump"
if instancingSupported {
vsbump = "vs_bump_instanced"
}
prog := assets.LoadProgram(vsbump, "fs_bump")
defer bgfx.DestroyProgram(prog)
textureColor := assets.LoadTexture("fieldstone-rgba.dds", 0)
textureNormal := assets.LoadTexture("fieldstone-n.dds", 0)
for app.Continue() {
var (
eye = [3]float32{0, 0, -7.0}
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.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: Loading textures.")
bgfx.DebugTextPrintf(0, 3, 0x0f, "Frame: % 7.3f[ms]", app.DeltaTime*1000.0)
bgfx.Submit(0)
const halfPi = math.Pi / 2
var lightPosRadius [4][4]float32
for i := 0; i < numLights; i++ {
fi := float32(i)
lightPosRadius[i][0] = float32(math.Sin(float64(app.Time*(0.1+fi*0.17)+fi*halfPi*1.37)) * 3.0)
lightPosRadius[i][1] = float32(math.Cos(float64(app.Time*(0.2+fi*0.29)+fi*halfPi*1.49)) * 3.0)
lightPosRadius[i][2] = -2.5
lightPosRadius[i][3] = 3.0
}
bgfx.SetUniform(uLightPosRadius, &lightPosRadius, numLights)
lightRgbInnerR := [4][4]float32{
{1.0, 0.7, 0.2, 0.8},
{0.7, 0.2, 1.0, 0.8},
{0.2, 1.0, 0.7, 0.8},
{1.0, 0.4, 0.2, 0.8},
}
bgfx.SetUniform(uLightRgbInnerR, &lightRgbInnerR, numLights)
if instancingSupported {
for y := 0; y < 3; y++ {
const numInstances = 3
const instanceStride = 64
idb := bgfx.AllocInstanceDataBuffer(numInstances, instanceStride)
for x := 0; x < 3; x++ {
mtx := mat4.RotateXYZ(
cgm.Radians(app.Time)*0.023+cgm.Radians(x)*0.21,
cgm.Radians(app.Time)*0.03+cgm.Radians(y)*0.37,
0,
)
mtx[12] = -3 + float32(x)*3
mtx[13] = -3 + float32(y)*3
mtx[14] = 0
binary.Write(&idb, binary.LittleEndian, mtx)
}
bgfx.SetInstanceDataBuffer(idb)
bgfx.SetProgram(prog)
bgfx.SetVertexBuffer(vb)
bgfx.SetIndexBuffer(ib)
bgfx.SetTexture(0, uTexColor, textureColor)
bgfx.SetTexture(1, uTexNormal, textureNormal)
bgfx.SetState(bgfx.StateDefault & (^bgfx.StateCullMask))
bgfx.Submit(0)
}
} else {
for y := 0; y < 3; y++ {
for x := 0; x < 3; x++ {
mtx := mat4.RotateXYZ(
cgm.Radians(app.Time)*0.023+cgm.Radians(x)*0.21,
cgm.Radians(app.Time)*0.03+cgm.Radians(y)*0.37,
0,
)
mtx[12] = -3 + float32(x)*3
mtx[13] = -3 + float32(y)*3
mtx[14] = 0
bgfx.SetTransform([16]float32(mtx))
bgfx.SetProgram(prog)
bgfx.SetVertexBuffer(vb)
bgfx.SetIndexBuffer(ib)
bgfx.SetTexture(0, uTexColor, textureColor)
bgfx.SetTexture(1, uTexNormal, textureNormal)
bgfx.SetState(bgfx.StateDefault & (^bgfx.StateCullMask))
bgfx.Submit(0)
}
}
}
bgfx.Frame()
}
}
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()
}
}
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 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_instancing", "fs_instancing")
defer bgfx.DestroyProgram(prog)
caps := bgfx.Caps()
for app.Continue() {
var (
eye = [3]float32{0, 0, -35.0}
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,
)
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: Geometry instancing.")
bgfx.DebugTextPrintf(0, 3, 0x0f, "Frame: % 7.3f[ms]", app.DeltaTime*1000.0)
bgfx.Submit(0)
if caps.Supported&bgfx.CapsInstancing == 0 {
color := uint8(0x01)
if uint32(app.Time*2)&1 != 0 {
color = 0x1f
}
bgfx.DebugTextPrintf(0, 5, color, " Instancing is not supported by GPU. ")
bgfx.Frame()
continue
}
const stride = 80
idb := bgfx.AllocInstanceDataBuffer(11*11, stride)
// Submit 11x11 cubes
time64 := float64(app.Time)
for y := 0; y < 11; y++ {
for x := 0; x < 11; x++ {
mtx := mat4.RotateXYZ(
cgm.Radians(app.Time)+cgm.Radians(x)*0.21,
cgm.Radians(app.Time)+cgm.Radians(y)*0.37,
0,
)
mtx[12] = -15 + float32(x)*3
mtx[13] = -15 + float32(y)*3
mtx[14] = 0
color := [4]float32{
float32(math.Sin(time64+float64(x)/11.0)*0.5 + 0.5),
float32(math.Cos(time64+float64(y)/11.0)*0.5 + 0.5),
float32(math.Sin(time64*3.0)*0.5 + 0.5),
1.0,
}
binary.Write(&idb, binary.LittleEndian, mtx)
binary.Write(&idb, binary.LittleEndian, color)
}
}
bgfx.SetProgram(prog)
bgfx.SetVertexBuffer(vb)
bgfx.SetIndexBuffer(ib)
bgfx.SetInstanceDataBuffer(idb)
bgfx.SetState(bgfx.StateDefault)
bgfx.Submit(0)
bgfx.Frame()
}
}