func GenTexture() (r0 Texture) {
defer func() {
errstr := errDrain()
log.Printf("gl.GenTexture() %v%v", r0, errstr)
}()
var t Texture
C.glGenTextures(1, (*C.GLuint)(&t.Value))
return t
}
// NewTexture2D creates a new texture object from the given image using glTexImage2D. It uses RGBA as a color format and sets GL_TEXTURE_{MIN,MAG}_FILTER to GL_NEAREST
func NewTexture2D(img image.Image, border int) Texture {
var t C.GLuint
C.glGenTextures(1, &t)
tt := Texture(t)
tt.Bind(TEXTURE_2D)
data := make([]uint16, img.Bounds().Dx()*img.Bounds().Dy()*4)
r := img.Bounds()
for x := r.Min.X; x < r.Max.X; x++ {
for y := r.Min.Y; y < r.Max.Y; y++ {
R, G, B, A := img.At(x, y).RGBA()
i := (y*r.Dx() + x) * 4
data[i] = uint16(R)
data[i+1] = uint16(G)
data[i+2] = uint16(B)
data[i+3] = uint16(A)
}
}
C.glTexImage2D(TEXTURE_2D, 0, RGBA, C.GLsizei(img.Bounds().Dx()), C.GLsizei(img.Bounds().Dy()), C.GLint(border), RGBA, UNSIGNED_SHORT, unsafe.Pointer(&data[0]))
C.glTexParameteri(TEXTURE_2D, TEXTURE_MIN_FILTER, NEAREST)
C.glTexParameteri(TEXTURE_2D, TEXTURE_MAG_FILTER, NEAREST)
tt.Unbind(TEXTURE_2D)
return tt
}
func CreateTexture() Texture {
var t Texture
C.glGenTextures(1, (*C.GLuint)(&t.Value))
return t
}
func GenTextures(
n Sizei, textures *uint32) {
C.glGenTextures(
C.GLsizei(n),
(*C.GLuint)(textures))
}
// Fill slice with new textures
func GenTextures(textures []Texture) {
if len(textures) > 0 {
C.glGenTextures(C.GLsizei(len(textures)), (*C.GLuint)(&textures[0]))
}
}
// Create single texture object
func GenTexture() Texture {
var b C.GLuint
C.glGenTextures(1, &b)
return Texture(b)
}
func CreateTexture() Texture {
texture := Texture(0)
C.glGenTextures(1, (*C.GLuint)(&texture))
return texture
}
func GenTextures(n int, textures Void) {
C.glGenTextures(C.GLsizei(n), (*C.GLuint)(unsafe.Pointer(textures)))
}
// GenTextures generates texture names.
func GenTextures(n int) []Texture {
texs := make([]Texture, n)
C.glGenTextures(C.GLsizei(n), (*C.GLuint)(&texs[0]))
return texs
}
