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,
)
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()
}
}