func MakeTextures(num gl.Sizei, glPtr []gl.Uint, dimensions uint8, texFormat gl.Enum, width, height, depth gl.Sizei) {
var is3d, is2d = (dimensions == 3), (dimensions == 2)
var texTarget gl.Enum = gltypes.Ife(is3d, gl.TEXTURE_3D, gltypes.Ife(is2d, gl.TEXTURE_2D, gl.TEXTURE_1D))
gl.GenTextures(num, &glPtr[0])
PanicIfErrors("MakeTextures.GenTextures(num=%v)", num)
if width == 0 {
panic("MakeTextures() needs at least width")
}
if height == 0 {
height = width
}
if depth == 0 {
depth = height
}
for i := 0; i < len(glPtr); i++ {
gl.BindTexture(texTarget, glPtr[i])
gl.TexParameteri(texTarget, gl.TEXTURE_MAG_FILTER, TexFilter)
gl.TexParameteri(texTarget, gl.TEXTURE_MIN_FILTER, TexFilter)
gl.TexParameteri(texTarget, gl.TEXTURE_WRAP_R, TexWrap)
gl.TexParameteri(texTarget, gl.TEXTURE_WRAP_S, TexWrap)
gl.TexParameteri(texTarget, gl.TEXTURE_WRAP_T, TexWrap)
if is3d {
gl.TexStorage3D(texTarget, 1, texFormat, width, height, depth)
} else if is2d {
gl.TexStorage2D(texTarget, 1, texFormat, width, height)
} else {
gl.TexStorage1D(texTarget, 1, texFormat, width)
}
gl.BindTexture(texTarget, 0)
PanicIfErrors("MakeTextures.Loop(i=%v dim=%v w=%v h=%v d=%v)", i, dimensions, width, height, depth)
}
}
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 MakeRttFramebuffer(texFormat gl.Enum, width, height, mipLevels gl.Sizei, anisoFiltering gl.Int) (gl.Uint, gl.Uint) {
var glPtrTex, glPtrFrameBuf gl.Uint
var glMagFilter, glMinFilter gl.Int = gl.LINEAR, gl.LINEAR
if anisoFiltering < 1 {
glMagFilter, glMinFilter = gl.NEAREST, gl.NEAREST
}
if mipLevels > 1 {
if anisoFiltering < 1 {
glMinFilter = gl.NEAREST_MIPMAP_NEAREST
} else {
glMinFilter = gl.LINEAR_MIPMAP_LINEAR
}
}
gl.GenTextures(1, &glPtrTex)
gl.BindTexture(gl.TEXTURE_2D, glPtrTex)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, glMagFilter)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, glMinFilter)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_BORDER)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_BORDER)
if anisoFiltering > 1 {
gl.TexParameteri(gl.TEXTURE_2D, 0x84FE, anisoFiltering)
} // max 16
gl.TexStorage2D(gl.TEXTURE_2D, mipLevels, texFormat, width, height)
gl.GenFramebuffers(1, &glPtrFrameBuf)
gl.BindFramebuffer(gl.FRAMEBUFFER, glPtrFrameBuf)
gl.FramebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, glPtrTex, 0)
gl.BindFramebuffer(gl.FRAMEBUFFER, 0)
gl.BindTexture(gl.TEXTURE_2D, 0)
PanicIfErrors("MakeRttFramebuffer")
return glPtrFrameBuf, glPtrTex
}
func MakeTextureForTarget(glPtr *gl.Uint, dimensions uint8, width, height, depth gl.Sizei, texTarget gl.Enum, texFormat gl.Enum, panicIfErrors, reuseGlPtr bool) {
var is3d, is2d = (dimensions == 3), (dimensions == 2)
if texTarget == 0 {
texTarget = gltypes.Ife(is3d, gl.TEXTURE_3D, gltypes.Ife(is2d, gl.TEXTURE_2D, gl.TEXTURE_1D))
}
if texFormat == 0 {
texFormat = gl.RGBA8
}
if width == 0 {
panic("MakeTextureForTarget() needs at least width")
}
if height == 0 {
height = width
}
if depth == 0 {
depth = height
}
if (!reuseGlPtr) || (*glPtr == 0) {
gl.GenTextures(1, glPtr)
}
gl.BindTexture(texTarget, *glPtr)
gl.TexParameteri(texTarget, gl.TEXTURE_MAG_FILTER, TexFilter)
gl.TexParameteri(texTarget, gl.TEXTURE_MIN_FILTER, TexFilter)
gl.TexParameteri(texTarget, gl.TEXTURE_WRAP_S, TexWrap)
if is2d || is3d {
gl.TexParameteri(texTarget, gl.TEXTURE_WRAP_T, TexWrap)
}
if is3d {
gl.TexParameteri(texTarget, gl.TEXTURE_WRAP_R, TexWrap)
}
if is3d {
gl.TexStorage3D(texTarget, 1, texFormat, width, height, depth)
} else if is2d {
gl.TexStorage2D(texTarget, 1, texFormat, width, height)
} else {
gl.TexStorage1D(texTarget, 1, texFormat, width)
}
gl.BindTexture(texTarget, 0)
if panicIfErrors {
PanicIfErrors("MakeTextureForTarget(dim=%v w=%v h=%v d=%v)", dimensions, width, height, depth)
}
}
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
}
