func NewTextureBuffer(data interface{}) *TextureBuffer {
texbuf := new(TextureBuffer)
texbuf.Texture = new(Texture)
gl33.GenTextures(1, &texbuf.Texture.Id)
texbuf.Texture.Type = gl33.TEXTURE_BUFFER
texbuf.Buffer = NewBuffer(gl33.TEXTURE_BUFFER, gl33.DYNAMIC_DRAW, data)
texbuf.Width = texbuf.Buffer.Value.Len()
var format gl33.Enum
switch data.(type) {
case []byte:
format = gl33.R8
case []uint16:
format = gl33.R16
case [][2]byte:
format = gl33.RG8
case [][2]uint16:
format = gl33.RG16
case [][4]byte:
format = gl33.RGBA8
case [][4]uint16:
format = gl33.RGBA16
}
texbuf.Bind(0)
gl33.TexBuffer(gl33.TEXTURE_BUFFER, format, texbuf.Buffer.Id)
return texbuf
}
// LoadTexture buffers an image.Image into the graphic cards memory.
func LoadTexture(img image.Image) (*Texture, error) {
w := img.Bounds().Dx()
h := 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))
}
}
var textureId gl.Uint
//gl.ActiveTexture(gl.TEXTURE0)
gl.GenTextures(1, &textureId)
gl.BindTexture(gl.TEXTURE_2D, textureId)
//gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.TexImage2D(gl.TEXTURE_2D, 0, 4, gl.Sizei(rgba.Rect.Dx()), gl.Sizei(rgba.Rect.Dy()), 0, gl.RGBA, gl.UNSIGNED_BYTE, gl.Pointer(&rgba.Pix[0]))
gl.BindTexture(gl.TEXTURE_2D, 0)
return &Texture{id: textureId}, nil
}
func NewTextureCubeMap() *Texture {
tex := new(Texture)
gl33.GenTextures(1, &tex.Id)
tex.Type = gl33.TEXTURE_CUBE_MAP
return tex
}
func NewTextureArray() *Texture {
tex := new(Texture)
gl33.GenTextures(1, &tex.Id)
tex.Type = gl33.TEXTURE_2D_ARRAY
return tex
}
func NewTexture2D() *Texture {
tex := new(Texture)
gl33.GenTextures(1, &tex.Id)
tex.Type = gl33.TEXTURE_2D
return tex
}