// TexParameter sets texture parameters.
func TexParameter(targ TextureTarget, parm TexParam, val interface{}) {
switch v := val.(type) {
case float32:
C.glTexParameterf(C.GLenum(targ), C.GLenum(parm), C.GLfloat(v))
case float64:
C.glTexParameterf(C.GLenum(targ), C.GLenum(parm), C.GLfloat(v))
case int32:
C.glTexParameteri(C.GLenum(targ), C.GLenum(parm), C.GLint(v))
case int:
C.glTexParameteri(C.GLenum(targ), C.GLenum(parm), C.GLint(v))
default:
panic("TexParameter requires either float32, float64, int32, or int")
}
}
func TexParameteri(
target Enum, pname Enum, param int32) {
C.glTexParameteri(
C.GLenum(target),
C.GLenum(pname),
C.GLint(param))
}
func TexParameteri(target, pname Enum, param int) {
defer func() {
errstr := errDrain()
log.Printf("gl.TexParameteri(%v, %v, %v) %v", target, pname, param, errstr)
}()
C.glTexParameteri(target.c(), pname.c(), C.GLint(param))
}
// 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 TexParameteri(target, pname Enum, param int) {
C.glTexParameteri(target.c(), pname.c(), C.GLint(param))
}
// TexParameteri calls glTexParameteri on the texture. The targ argument is used for binding and should most likely be TEXTURE_2D.
func (t Texture) TexParameteri(targ, pname, param int) {
t.Bind(targ)
C.glTexParameteri(C.GLenum(targ), C.GLenum(pname), C.GLint(param))
t.Unbind(targ)
}
func TexParameter(target TextureTarget, pname TextureParameter, param TextureParameterValue) {
C.glTexParameteri(C.GLenum(target), C.GLenum(pname), C.GLint(param))
}
func TexParameteri(target, pname uint, param int) {
C.glTexParameteri(C.GLenum(target), C.GLenum(pname), C.GLint(param))
}
