func getGLTexture(img image.Image, smoothing TextureSmoothing) (t uint32, err error) {
var (
data *bytes.Buffer
bounds image.Rectangle
width int
height int
)
if data, err = imageBytes(img); err != nil {
return
}
bounds = img.Bounds()
width = bounds.Max.X - bounds.Min.X
height = bounds.Max.Y - bounds.Min.Y
gl.GenTextures(1, &t)
gl.BindTexture(gl.TEXTURE_2D, t)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, int32(smoothing))
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, int32(smoothing))
gl.TexImage2D(
gl.TEXTURE_2D,
0,
gl.RGBA,
int32(width),
int32(height),
0,
gl.RGBA,
gl.UNSIGNED_INT_8_8_8_8,
gl.Ptr(data.Bytes()),
)
gl.GenerateMipmap(gl.TEXTURE_2D)
gl.BindTexture(gl.TEXTURE_2D, 0)
return
}
func GetGLTexture(img image.Image, smoothing TextureSmoothing) (t uint32, err error) {
var (
data *bytes.Buffer
bounds image.Rectangle
width int
height int
)
if data, err = imageBytes(img); err != nil {
return
}
bounds = img.Bounds()
width = bounds.Max.X - bounds.Min.X
height = bounds.Max.Y - bounds.Min.Y
gl.GenTextures(1, &t)
if e := gl.GetError(); e != 0 {
fmt.Printf("ggt1 ERROR: %s\n", e)
}
gl.BindTexture(gl.TEXTURE_2D, t)
if e := gl.GetError(); e != 0 {
fmt.Printf("ggt2 ERROR: %s\n", e)
}
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, int32(smoothing))
if e := gl.GetError(); e != 0 {
fmt.Printf("ggt3 ERROR: %s\n", e)
}
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, int32(smoothing))
if e := gl.GetError(); e != 0 {
fmt.Printf("ggt4 ERROR: %s\n", e)
}
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, int32(width), int32(height), 0, gl.RGBA, gl.UNSIGNED_INT_8_8_8_8, gl.Ptr(data.Bytes()))
if e := gl.GetError(); e != 0 {
fmt.Printf("ggt5 ERROR: %s\n", e)
}
gl.GenerateMipmap(gl.TEXTURE_2D)
if e := gl.GetError(); e != 0 {
fmt.Printf("ggt6 ERROR: %s\n", e)
}
gl.BindTexture(gl.TEXTURE_2D, 0)
if e := gl.GetError(); e != 0 {
fmt.Printf("ggt7 ERROR: %s\n", e)
}
return
}
func LoadImageToTexture(filePath string) (glTex uint32, e error) {
gl.GenTextures(1, &glTex)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, glTex)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR_MIPMAP_LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT)
rgba_flipped, err := loadFile(filePath)
if err != nil {
return glTex, err
}
imageSize := int32(rgba_flipped.Bounds().Max.X)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, imageSize, imageSize, 0, gl.RGBA, gl.UNSIGNED_BYTE, gl.Ptr(rgba_flipped.Pix))
gl.GenerateMipmap(gl.TEXTURE_2D)
return glTex, nil
}
func bindAggregateImage(img image.Image, idx int) uint32 {
newIdx := idx
if rgba, ok := img.(*image.RGBA); ok {
gl.GenTextures(1, &textures[newIdx])
gl.ActiveTexture(gl.TEXTURE0 + uint32(newIdx))
gl.BindTexture(gl.TEXTURE_2D, textures[newIdx])
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_R, gl.CLAMP_TO_EDGE)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, int32(rgba.Rect.Size().X), int32(rgba.Rect.Size().Y), 0, gl.RGBA, gl.UNSIGNED_BYTE, gl.Ptr(rgba.Pix))
gl.GenerateMipmap(gl.TEXTURE_2D)
idxS := strconv.Itoa(newIdx)
fmt.Println("idx: ", int32(newIdx), "myTextureSampler["+idxS+"]\x00")
gl.Uniform1i(gl.GetUniformLocation(program, gl.Str("myTextureSampler["+idxS+"]\x00")), int32(newIdx))
if ok := gl.GetError(); ok != gl.NO_ERROR {
fmt.Println("1- Cannot load Image in location: ./: ", ok)
os.Exit(-1)
}
return textures[newIdx]
} else {
fmt.Println("Image not RGBA at location: ./")
os.Exit(-1)
}
return 0
}