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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
// https://www.khronos.org/registry/webgl/specs/latest/1.0/webgl.idl
use dom::bindings::codegen::Bindings::WebGLRenderingContextBinding::WebGLRenderingContextConstants as constants;
use dom::bindings::codegen::Bindings::WebGLTextureBinding;
use dom::bindings::global::GlobalRef;
use dom::bindings::js::Root;
use dom::bindings::utils::reflect_dom_object;
use dom::webglobject::WebGLObject;
use canvas_traits::{CanvasMsg, CanvasWebGLMsg, WebGLError, WebGLResult};
use ipc_channel::ipc::{self, IpcSender};
use std::cell::Cell;
pub enum TexParameterValue {
Float(f32),
Int(i32),
}
#[dom_struct]
pub struct WebGLTexture {
webgl_object: WebGLObject,
id: u32,
/// The target to which this texture was bound the first time
target: Cell<Option<u32>>,
is_deleted: Cell<bool>,
#[ignore_heap_size_of = "Defined in ipc-channel"]
renderer: IpcSender<CanvasMsg>,
}
impl WebGLTexture {
fn new_inherited(renderer: IpcSender<CanvasMsg>, id: u32) -> WebGLTexture {
WebGLTexture {
webgl_object: WebGLObject::new_inherited(),
id: id,
target: Cell::new(None),
is_deleted: Cell::new(false),
renderer: renderer,
}
}
pub fn maybe_new(global: GlobalRef, renderer: IpcSender<CanvasMsg>)
-> Option<Root<WebGLTexture>> {
let (sender, receiver) = ipc::channel().unwrap();
renderer.send(CanvasMsg::WebGL(CanvasWebGLMsg::CreateTexture(sender))).unwrap();
let result = receiver.recv().unwrap();
result.map(|texture_id| WebGLTexture::new(global, renderer, *texture_id))
}
pub fn new(global: GlobalRef, renderer: IpcSender<CanvasMsg>, id: u32) -> Root<WebGLTexture> {
reflect_dom_object(box WebGLTexture::new_inherited(renderer, id), global, WebGLTextureBinding::Wrap)
}
}
pub trait WebGLTextureHelpers {
fn id(self) -> u32;
fn bind(self, target: u32) -> WebGLResult<()>;
fn delete(self);
fn tex_parameter(self,
target: u32,
name: u32,
value: TexParameterValue) -> WebGLResult<()>;
}
impl<'a> WebGLTextureHelpers for &'a WebGLTexture {
fn id(self) -> u32 {
self.id
}
// NB: Only valid texture targets come here
fn bind(self, target: u32) -> WebGLResult<()> {
if let Some(previous_target) = self.target.get() {
if target != previous_target {
return Err(WebGLError::InvalidOperation);
}
} else {
self.target.set(Some(target));
}
self.renderer.send(CanvasMsg::WebGL(CanvasWebGLMsg::BindTexture(self.id, target))).unwrap();
Ok(())
}
fn delete(self) {
if !self.is_deleted.get() {
self.is_deleted.set(true);
self.renderer.send(CanvasMsg::WebGL(CanvasWebGLMsg::DeleteTexture(self.id))).unwrap();
}
}
/// We have to follow the conversion rules for GLES 2.0. See:
/// https://www.khronos.org/webgl/public-mailing-list/archives/1008/msg00014.html
///
fn tex_parameter(self,
target: u32,
name: u32,
value: TexParameterValue) -> WebGLResult<()> {
let (int_value, _float_value) = match value {
TexParameterValue::Int(int_value) => (int_value, int_value as f32),
TexParameterValue::Float(float_value) => (float_value as i32, float_value),
};
match name {
constants::TEXTURE_MIN_FILTER => {
match int_value as u32 {
constants::NEAREST |
constants::LINEAR |
constants::NEAREST_MIPMAP_NEAREST |
constants::LINEAR_MIPMAP_NEAREST |
constants::NEAREST_MIPMAP_LINEAR |
constants::LINEAR_MIPMAP_LINEAR => {
self.renderer
.send(CanvasMsg::WebGL(CanvasWebGLMsg::TexParameteri(target, name, int_value)))
.unwrap();
return Ok(());
},
_ => return Err(WebGLError::InvalidEnum),
}
},
constants::TEXTURE_MAG_FILTER => {
match int_value as u32 {
constants::NEAREST |
constants::LINEAR => {
self.renderer
.send(CanvasMsg::WebGL(CanvasWebGLMsg::TexParameteri(target, name, int_value)))
.unwrap();
return Ok(());
},
_ => return Err(WebGLError::InvalidEnum),
}
},
constants::TEXTURE_WRAP_S |
constants::TEXTURE_WRAP_T => {
match int_value as u32 {
constants::CLAMP_TO_EDGE |
constants::MIRRORED_REPEAT |
constants::REPEAT => {
self.renderer
.send(CanvasMsg::WebGL(CanvasWebGLMsg::TexParameteri(target, name, int_value)))
.unwrap();
return Ok(());
},
_ => return Err(WebGLError::InvalidEnum),
}
},
_ => return Err(WebGLError::InvalidEnum),
}
}
}
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