// SetWrap will set how the texture behaves when applies to a plane that is larger
// than itself.
func (texture *Texture) SetWrap(wrap_s, wrap_t WrapMode) {
texture.wrap.s = wrap_s
texture.wrap.t = wrap_t
bindTexture(texture.getHandle())
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, int(wrap_s))
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, int(wrap_t))
}
// Set the 'default' texture (id 0) as a repeating white pixel. Otherwise,
// texture2D calls inside a shader would return black when drawing graphics
// primitives, which would create the need to use different "passthrough"
// shaders for untextured primitives vs images.
func createDefaultTexture() {
gl_state.defaultTexture = gl.CreateTexture()
bindTexture(gl_state.defaultTexture)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT)
pix := []byte{255, 255, 255, 255}
gl.TexImage2D(gl.TEXTURE_2D, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, gl.Ptr(pix))
}
// setTextureFilter will set the texture filter on the actual gl texture. It will
// not reach this state if the filter is not valid.
func (texture *Texture) setTextureFilter() {
var gmin, gmag uint32
bindTexture(texture.getHandle())
if texture.filter.mipmap == FILTER_NONE {
if texture.filter.min == FILTER_NEAREST {
gmin = gl.NEAREST
} else { // f.min == FILTER_LINEAR
gmin = gl.LINEAR
}
} else {
if texture.filter.min == FILTER_NEAREST && texture.filter.mipmap == FILTER_NEAREST {
gmin = gl.NEAREST_MIPMAP_NEAREST
} else if texture.filter.min == FILTER_NEAREST && texture.filter.mipmap == FILTER_LINEAR {
gmin = gl.NEAREST_MIPMAP_LINEAR
} else if texture.filter.min == FILTER_LINEAR && texture.filter.mipmap == FILTER_NEAREST {
gmin = gl.LINEAR_MIPMAP_NEAREST
} else if texture.filter.min == FILTER_LINEAR && texture.filter.mipmap == FILTER_LINEAR {
gmin = gl.LINEAR_MIPMAP_LINEAR
} else {
gmin = gl.LINEAR
}
}
switch texture.filter.mag {
case FILTER_NEAREST:
gmag = gl.NEAREST
case FILTER_LINEAR:
fallthrough
default:
gmag = gl.LINEAR
}
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, int(gmin))
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, int(gmag))
//gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_MAX_ANISOTROPY_EXT, texture.filter.anisotropy)
}