func MakeTextureFromImageFile(filePath string) gl.Uint {
var file, err = os.Open(filePath)
var img image.Image
var tex gl.Uint
if err != nil {
panic(err)
}
defer file.Close()
img, _, err = image.Decode(file)
if err != nil {
panic(err)
}
w, h := img.Bounds().Dx(), img.Bounds().Dy()
sw, sh := gl.Sizei(w), gl.Sizei(h)
rgba := image.NewRGBA(image.Rect(0, 0, w, h))
for x := 0; x < w; x++ {
for y := 0; y < h; y++ {
rgba.Set(x, y, img.At(x, h-1-y))
}
}
gl.GenTextures(1, &tex)
gl.BindTexture(gl.TEXTURE_2D, tex)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT)
gl.TexStorage2D(gl.TEXTURE_2D, 1, gl.RGBA8, sw, sh)
gl.TexSubImage2D(gl.TEXTURE_2D, 0, 0, 0, sw, sh, gl.RGBA, gl.UNSIGNED_BYTE, gl.Pointer(&rgba.Pix[0]))
gl.BindTexture(gl.TEXTURE_2D, 0)
PanicIfErrors("MakeTextureFromImageFile(%v)", filePath)
return tex
}
func renderToScreen() {
gl.BindFramebuffer(gl.FRAMEBUFFER, 0)
gl.Viewport(0, 0, winWidth, winHeight)
gl.UseProgram(shaderTextureDisplay.glProg)
gl.BindTexture(gl.TEXTURE_2D, rttFrameTex)
gl.Uniform1i(shaderTextureDisplay.unifTex, 0)
gl.BindBuffer(gl.ARRAY_BUFFER, dispVertBuf)
gl.EnableVertexAttribArray(shaderTextureDisplay.attrPos)
gl.VertexAttribPointer(shaderTextureDisplay.attrPos, 3, gl.FLOAT, gl.FALSE, 0, gl.Pointer(nil))
gl.DrawArrays(gl.TRIANGLE_FAN, 0, 4)
gl.DisableVertexAttribArray(shaderTextureDisplay.attrPos)
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
}
func renderToTexture() {
gl.BindFramebuffer(gl.FRAMEBUFFER, rttFrameBuf)
gl.Viewport(0, 0, texSize, texSize)
gl.ClearColor(0.9, 0.6, 0.3, 1)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
gl.UseProgram(shaderTextureCreator.glProg)
gl.BindBuffer(gl.ARRAY_BUFFER, rttVertBuf)
gl.EnableVertexAttribArray(shaderTextureCreator.attrPos)
gl.VertexAttribPointer(shaderTextureCreator.attrPos, 2, gl.FLOAT, gl.FALSE, 0, gl.Pointer(nil))
gl.DrawArrays(gl.TRIANGLE_FAN, 0, 4)
gl.DisableVertexAttribArray(shaderTextureCreator.attrPos)
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
}
func renderToTexture() {
gl.BindFramebuffer(gl.FRAMEBUFFER, rttFrameBuf)
gl.Viewport(0, 0, texWidth, texHeight)
gl.ClearColor(0.1, 0.2, 0.3, 1)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
gl.UseProgram(shaderTextureCreator.glProg)
gl.BindTexture(gl.TEXTURE_3D, volTex)
gl.Uniform1i(shaderTextureCreator.unifTex, 0)
gl.BindBuffer(gl.ARRAY_BUFFER, rttVertBuf)
gl.EnableVertexAttribArray(shaderTextureCreator.attrPos)
gl.VertexAttribPointer(shaderTextureCreator.attrPos, 2, gl.FLOAT, gl.FALSE, 0, gl.Pointer(nil))
gl.DrawArrays(gl.TRIANGLE_FAN, 0, 4)
gl.DisableVertexAttribArray(shaderTextureCreator.attrPos)
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
}
func MakeTextureFromImageFloatsFile(filePath string, w, h int) gl.Uint {
var file, err = os.Open(filePath)
var tex gl.Uint
var pix = make([]gl.Float, w*h*3)
var fVal float32
var raw []uint8
var buf *bytes.Buffer
var i int
if err != nil {
panic(err)
}
defer file.Close()
raw, err = ioutil.ReadAll(file)
if err != nil {
panic(err)
}
buf = bytes.NewBuffer(raw)
for i = 0; (err == nil) && (i < len(pix)); i++ {
if err = binary.Read(buf, binary.LittleEndian, &fVal); err == io.EOF {
err = nil
break
} else if err == nil {
pix[i] = gl.Float(fVal)
}
}
if err != nil {
panic(err)
}
sw, sh := gl.Sizei(w), gl.Sizei(h)
gl.GenTextures(1, &tex)
gl.BindTexture(gl.TEXTURE_2D, tex)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT)
gl.TexStorage2D(gl.TEXTURE_2D, 1, gl.RGB16F, sw, sh)
gl.TexSubImage2D(gl.TEXTURE_2D, 0, 0, 0, sw, sh, gl.RGB, gl.FLOAT, gl.Pointer(&pix[0]))
gl.BindTexture(gl.TEXTURE_2D, 0)
PanicIfErrors("MakeTextureFromImageFloatsFile(%v)", filePath)
return tex
}
func (m *Mat4) Pointer() (pointer gl.Pointer) {
pointer = gl.Pointer(unsafe.Pointer(m))
return pointer
}
func (v *Vec2) Pointer() (pointer gl.Pointer) {
pointer = gl.Pointer(unsafe.Pointer(v))
return pointer
}
func loadVolume() {
var file, err = os.Open("/home/roxor/apps/ImageVis3D/Data/BostonTeapot.raw")
var bytes []byte
if err != nil {
panic(err)
}
defer file.Close()
if bytes, err = ioutil.ReadAll(file); err != nil {
panic(err)
}
gl.GenTextures(1, &volTex)
gl.BindTexture(gl.TEXTURE_3D, volTex)
gl.TexParameteri(gl.TEXTURE_3D, gl.TEXTURE_MAG_FILTER, glTexFilter)
gl.TexParameteri(gl.TEXTURE_3D, gl.TEXTURE_MIN_FILTER, glTexFilter)
gl.TexParameteri(gl.TEXTURE_3D, gl.TEXTURE_WRAP_R, glTexClamp)
gl.TexParameteri(gl.TEXTURE_3D, gl.TEXTURE_WRAP_S, glTexClamp)
gl.TexParameteri(gl.TEXTURE_3D, gl.TEXTURE_WRAP_T, glTexClamp)
gl.TexImage3D(gl.TEXTURE_3D, 0, gl.ALPHA, 256, 256, 178, 0, gl.ALPHA, gl.UNSIGNED_BYTE, gl.Pointer(&bytes[0]))
gl.BindTexture(gl.TEXTURE_3D, 0)
}
func glFillTextureFromImageFile(filePath string) {
var file, err = os.Open(filePath)
var img image.Image
if err != nil {
panic(err)
}
defer file.Close()
if img, _, err = image.Decode(file); err != nil {
panic(err)
}
w, h := img.Bounds().Dx(), img.Bounds().Dy()
rgba := image.NewRGBA(image.Rect(0, 0, w, h))
for x := 0; x < w; x++ {
for y := 0; y < h; y++ {
rgba.Set(x, y, img.At(x, y))
}
}
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.Sizei(w), gl.Sizei(h), 0, gl.RGBA, gl.UNSIGNED_BYTE, gl.Pointer(&rgba.Pix[0]))
}
func glFillBuffer(vals []gl.Float, buf *gl.Uint) {
gl.GenBuffers(1, buf)
gl.BindBuffer(gl.ARRAY_BUFFER, *buf)
gl.BufferData(gl.ARRAY_BUFFER, gl.Sizeiptr(len(vals)*4), gl.Pointer(&vals[0]), gl.STATIC_DRAW)
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
}
func MakeAtomicCounters(glPtr *gl.Uint, num gl.Sizei) {
gl.GenBuffers(1, glPtr)
gl.BindBuffer(gl.ATOMIC_COUNTER_BUFFER, *glPtr)
gl.BufferData(gl.ATOMIC_COUNTER_BUFFER, gl.Sizeiptr(4*num), gl.Pointer(nil), BufMode)
gl.BindBuffer(gl.ATOMIC_COUNTER_BUFFER, 0)
}
func MakeArrayBuffer(glPtr *gl.Uint, size uint64, sl interface{}, isLen, makeTex bool) gl.Uint {
var ptr = gl.Pointer(nil)
var glTex gl.Uint = 0
var glTexFormat gl.Enum = gl.R8UI
var sizeFactor, sizeTotal uint64 = 1, 0
var tm = false
var handle = func(sf uint64, glPtr gl.Pointer, le int, tf gl.Enum) {
tm = true
if le > 1 {
ptr = glPtr
}
if size == 0 {
size = uint64(le)
isLen = true
}
if isLen {
sizeFactor = sf
}
if tf != 0 {
glTexFormat = tf
}
}
if (sl == nil) && FillWithZeroes {
sl = make([]uint8, size)
}
gl.GenBuffers(1, glPtr)
gl.BindBuffer(gl.ARRAY_BUFFER, *glPtr)
if sl != nil {
if tv, tb := sl.([]uint8); tb {
handle(1, gl.Pointer(&tv[0]), len(tv), gl.R8UI)
}
if tv, tb := sl.([]uint16); tb {
handle(2, gl.Pointer(&tv[0]), len(tv), gl.R16UI)
}
if tv, tb := sl.([]uint32); tb {
handle(4, gl.Pointer(&tv[0]), len(tv), gl.R32UI)
}
if tv, tb := sl.([]uint64); tb {
handle(8, gl.Pointer(&tv[0]), len(tv), gl.RG32UI)
}
if tv, tb := sl.([]int8); tb {
handle(1, gl.Pointer(&tv[0]), len(tv), gl.R8I)
}
if tv, tb := sl.([]int16); tb {
handle(2, gl.Pointer(&tv[0]), len(tv), gl.R16I)
}
if tv, tb := sl.([]int32); tb {
handle(4, gl.Pointer(&tv[0]), len(tv), gl.R32I)
}
if tv, tb := sl.([]int64); tb {
handle(8, gl.Pointer(&tv[0]), len(tv), gl.RG32I)
}
if tv, tb := sl.([]float32); tb {
handle(4, gl.Pointer(&tv[0]), len(tv), gl.R32F)
}
if tv, tb := sl.([]float64); tb {
handle(8, gl.Pointer(&tv[0]), len(tv), gl.RG32F)
}
if tv, tb := sl.([]gl.Bitfield); tb {
handle(4, gl.Pointer(&tv[0]), len(tv), gl.R8UI)
}
if tv, tb := sl.([]gl.Byte); tb {
handle(1, gl.Pointer(&tv[0]), len(tv), gl.R8I)
}
if tv, tb := sl.([]gl.Ubyte); tb {
handle(1, gl.Pointer(&tv[0]), len(tv), gl.R8UI)
}
if tv, tb := sl.([]gl.Ushort); tb {
handle(2, gl.Pointer(&tv[0]), len(tv), gl.R16UI)
}
if tv, tb := sl.([]gl.Short); tb {
handle(2, gl.Pointer(&tv[0]), len(tv), gl.R16I)
}
if tv, tb := sl.([]gl.Uint); tb {
handle(4, gl.Pointer(&tv[0]), len(tv), gl.R32UI)
}
if tv, tb := sl.([]gl.Uint64); tb {
handle(8, gl.Pointer(&tv[0]), len(tv), gl.RG32UI)
}
if tv, tb := sl.([]gl.Int); tb {
handle(4, gl.Pointer(&tv[0]), len(tv), gl.R32I)
}
if tv, tb := sl.([]gl.Int64); tb {
handle(8, gl.Pointer(&tv[0]), len(tv), gl.RG32I)
}
if tv, tb := sl.([]gl.Clampd); tb {
handle(8, gl.Pointer(&tv[0]), len(tv), gl.RG32F)
}
if tv, tb := sl.([]gl.Clampf); tb {
handle(4, gl.Pointer(&tv[0]), len(tv), gl.R32F)
}
if tv, tb := sl.([]gl.Float); tb {
handle(4, gl.Pointer(&tv[0]), len(tv), gl.R32F)
}
if tv, tb := sl.([]gl.Half); tb {
handle(2, gl.Pointer(&tv[0]), len(tv), gl.R16F)
}
if tv, tb := sl.([]gl.Double); tb {
handle(8, gl.Pointer(&tv[0]), len(tv), gl.RG32F)
}
if tv, tb := sl.([]gl.Enum); tb {
handle(4, gl.Pointer(&tv[0]), len(tv), gl.R32I)
}
if tv, tb := sl.([]gl.Sizei); tb {
handle(4, gl.Pointer(&tv[0]), len(tv), gl.R32UI)
}
if tv, tb := sl.([]gl.Char); tb {
handle(1, gl.Pointer(&tv[0]), len(tv), gl.R8UI)
}
if !tm {
log.Panicf("MakeArrayBuffer() -- slice type unsupported:\n%+v", sl)
}
}
sizeTotal = size * sizeFactor
gl.BufferData(gl.ARRAY_BUFFER, gl.Sizeiptr(sizeTotal), ptr, BufMode)
if makeTex {
if sizeTotal > MaxTextureBufferSize() {
log.Panicf("Texture buffer size (%vMB) would exceed your GPU's maximum texture buffer size (%vMB)", sizeTotal/MB, maxTexBufSize/MB)
}
gl.GenTextures(1, &glTex)
gl.BindTexture(gl.TEXTURE_BUFFER, glTex)
gl.TexBuffer(gl.TEXTURE_BUFFER, glTexFormat, *glPtr)
gl.BindTexture(gl.TEXTURE_2D, 0)
}
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
PanicIfErrors("MakeArrayBuffer()")
return glTex
}
func OffsetPointer(ptr gl.Pointer, offset uint) gl.Pointer {
return gl.Pointer(uintptr(ptr) + uintptr(offset))
}