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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/. */
use canvas_traits::webgl::WebGLError;
use core::iter::FromIterator;
use core::nonzero::NonZero;
use dom::bindings::cell::DomRefCell;
use dom::bindings::codegen::Bindings::OESStandardDerivativesBinding::OESStandardDerivativesConstants;
use dom::bindings::codegen::Bindings::OESTextureHalfFloatBinding::OESTextureHalfFloatConstants;
use dom::bindings::codegen::Bindings::WebGLRenderingContextBinding::WebGLRenderingContextConstants as constants;
use dom::bindings::root::Root;
use dom::bindings::trace::JSTraceable;
use dom::webglrenderingcontext::WebGLRenderingContext;
use fnv::{FnvHashMap, FnvHashSet};
use gleam::gl::GLenum;
use heapsize::HeapSizeOf;
use js::jsapi::{JSContext, JSObject};
use js::jsval::JSVal;
use ref_filter_map::ref_filter_map;
use std::cell::Ref;
use std::collections::HashMap;
use super::{ext, WebGLExtension};
use super::wrapper::{WebGLExtensionWrapper, TypedWebGLExtensionWrapper};
// Data types that are implemented for texImage2D and texSubImage2D in WebGLRenderingContext
// but must trigger a InvalidValue error until the related WebGL Extensions are enabled.
// Example: https://www.khronos.org/registry/webgl/extensions/OES_texture_float/
const DEFAULT_DISABLED_TEX_TYPES: [GLenum; 2] = [
constants::FLOAT, OESTextureHalfFloatConstants::HALF_FLOAT_OES
];
// Data types that are implemented for textures in WebGLRenderingContext
// but not allowed to use with linear filtering until the related WebGL Extensions are enabled.
// Example: https://www.khronos.org/registry/webgl/extensions/OES_texture_float_linear/
const DEFAULT_NOT_FILTERABLE_TEX_TYPES: [GLenum; 2] = [
constants::FLOAT, OESTextureHalfFloatConstants::HALF_FLOAT_OES
];
// Param names that are implemented for getParameter WebGL function
// but must trigger a InvalidEnum error until the related WebGL Extensions are enabled.
// Example: https://www.khronos.org/registry/webgl/extensions/OES_standard_derivatives/
const DEFAULT_DISABLED_GET_PARAMETER_NAMES: [GLenum; 1] = [
OESStandardDerivativesConstants::FRAGMENT_SHADER_DERIVATIVE_HINT_OES
];
/// WebGL features that are enabled/disabled by WebGL Extensions.
#[derive(HeapSizeOf, JSTraceable)]
struct WebGLExtensionFeatures {
gl_extensions: FnvHashSet<String>,
disabled_tex_types: FnvHashSet<GLenum>,
not_filterable_tex_types: FnvHashSet<GLenum>,
effective_tex_internal_formats: FnvHashMap<TexFormatType, u32>,
query_parameter_handlers: FnvHashMap<GLenum, WebGLQueryParameterHandler>,
/// WebGL Hint() targets enabled by extensions.
hint_targets: FnvHashSet<GLenum>,
/// WebGL GetParameter() names enabled by extensions.
disabled_get_parameter_names: FnvHashSet<GLenum>,
}
impl Default for WebGLExtensionFeatures {
fn default() -> WebGLExtensionFeatures {
WebGLExtensionFeatures {
gl_extensions: Default::default(),
disabled_tex_types: DEFAULT_DISABLED_TEX_TYPES.iter().cloned().collect(),
not_filterable_tex_types: DEFAULT_NOT_FILTERABLE_TEX_TYPES.iter().cloned().collect(),
effective_tex_internal_formats: Default::default(),
query_parameter_handlers: Default::default(),
hint_targets: Default::default(),
disabled_get_parameter_names: DEFAULT_DISABLED_GET_PARAMETER_NAMES.iter().cloned().collect(),
}
}
}
/// Handles the list of implemented, supported and enabled WebGL extensions.
#[must_root]
#[derive(HeapSizeOf, JSTraceable)]
pub struct WebGLExtensions {
extensions: DomRefCell<HashMap<String, Box<WebGLExtensionWrapper>>>,
features: DomRefCell<WebGLExtensionFeatures>,
}
impl WebGLExtensions {
pub fn new() -> WebGLExtensions {
Self {
extensions: DomRefCell::new(HashMap::new()),
features: DomRefCell::new(Default::default())
}
}
pub fn init_once<F>(&self, cb: F) where F: FnOnce() -> String {
if self.extensions.borrow().len() == 0 {
let gl_str = cb();
self.features.borrow_mut().gl_extensions = FnvHashSet::from_iter(gl_str.split(&[',', ' '][..])
.map(|s| s.into()));
self.register_all_extensions();
}
}
pub fn register<T:'static + WebGLExtension + JSTraceable + HeapSizeOf>(&self) {
let name = T::name().to_uppercase();
self.extensions.borrow_mut().insert(name, box TypedWebGLExtensionWrapper::<T>::new());
}
pub fn get_suported_extensions(&self) -> Vec<&'static str> {
self.extensions.borrow().iter()
.filter(|ref v| v.1.is_supported(&self))
.map(|ref v| v.1.name())
.collect()
}
pub fn get_or_init_extension(&self, name: &str, ctx: &WebGLRenderingContext) -> Option<NonZero<*mut JSObject>> {
let name = name.to_uppercase();
self.extensions.borrow().get(&name).and_then(|extension| {
if extension.is_supported(self) {
Some(extension.instance_or_init(ctx, self))
} else {
None
}
})
}
pub fn is_enabled<T>(&self) -> bool
where
T: 'static + WebGLExtension + JSTraceable + HeapSizeOf
{
let name = T::name().to_uppercase();
self.extensions.borrow().get(&name).map_or(false, |ext| { ext.is_enabled() })
}
pub fn get_dom_object<T>(&self) -> Option<Root<T::Extension>>
where
T: 'static + WebGLExtension + JSTraceable + HeapSizeOf
{
let name = T::name().to_uppercase();
self.extensions.borrow().get(&name).and_then(|extension| {
extension.as_any().downcast_ref::<TypedWebGLExtensionWrapper<T>>().and_then(|extension| {
extension.dom_object()
})
})
}
pub fn supports_gl_extension(&self, name: &str) -> bool {
self.features.borrow().gl_extensions.contains(name)
}
pub fn supports_any_gl_extension(&self, names: &[&str]) -> bool {
let features = self.features.borrow();
names.iter().any(|name| features.gl_extensions.contains(*name))
}
pub fn enable_tex_type(&self, data_type: GLenum) {
self.features.borrow_mut().disabled_tex_types.remove(&data_type);
}
pub fn is_tex_type_enabled(&self, data_type: GLenum) -> bool {
self.features.borrow().disabled_tex_types.get(&data_type).is_none()
}
pub fn add_effective_tex_internal_format(&self,
source_internal_format: u32,
source_data_type: u32,
effective_internal_format: u32)
{
let format = TexFormatType(source_internal_format, source_data_type);
self.features.borrow_mut().effective_tex_internal_formats.insert(format,
effective_internal_format);
}
pub fn get_effective_tex_internal_format(&self,
source_internal_format: u32,
source_data_type: u32) -> u32 {
let format = TexFormatType(source_internal_format, source_data_type);
*(self.features.borrow().effective_tex_internal_formats.get(&format)
.unwrap_or(&source_internal_format))
}
pub fn enable_filterable_tex_type(&self, text_data_type: GLenum) {
self.features.borrow_mut().not_filterable_tex_types.remove(&text_data_type);
}
pub fn is_filterable(&self, text_data_type: u32) -> bool {
self.features.borrow().not_filterable_tex_types.get(&text_data_type).is_none()
}
pub fn add_query_parameter_handler(&self, name: GLenum, f: Box<WebGLQueryParameterFunc>) {
let handler = WebGLQueryParameterHandler {
func: f
};
self.features.borrow_mut().query_parameter_handlers.insert(name, handler);
}
pub fn get_query_parameter_handler(&self, name: GLenum) -> Option<Ref<Box<WebGLQueryParameterFunc>>> {
ref_filter_map(self.features.borrow(), |features| {
features.query_parameter_handlers.get(&name).map(|item| &item.func)
})
}
pub fn enable_hint_target(&self, name: GLenum) {
self.features.borrow_mut().hint_targets.insert(name);
}
pub fn is_hint_target_enabled(&self, name: GLenum) -> bool {
self.features.borrow().hint_targets.contains(&name)
}
pub fn enable_get_parameter_name(&self, name: GLenum) {
self.features.borrow_mut().disabled_get_parameter_names.remove(&name);
}
pub fn is_get_parameter_name_enabled(&self, name: GLenum) -> bool {
!self.features.borrow().disabled_get_parameter_names.contains(&name)
}
fn register_all_extensions(&self) {
self.register::<ext::oesstandardderivatives::OESStandardDerivatives>();
self.register::<ext::oestexturefloat::OESTextureFloat>();
self.register::<ext::oestexturefloatlinear::OESTextureFloatLinear>();
self.register::<ext::oestexturehalffloat::OESTextureHalfFloat>();
self.register::<ext::oestexturehalffloatlinear::OESTextureHalfFloatLinear>();
self.register::<ext::oesvertexarrayobject::OESVertexArrayObject>();
}
}
// Helper structs
#[derive(Eq, Hash, HeapSizeOf, JSTraceable, PartialEq)]
struct TexFormatType(u32, u32);
type WebGLQueryParameterFunc = Fn(*mut JSContext, &WebGLRenderingContext)
-> Result<JSVal, WebGLError>;
#[derive(HeapSizeOf)]
struct WebGLQueryParameterHandler {
#[ignore_heap_size_of = "Closures are hard"]
func: Box<WebGLQueryParameterFunc>
}
unsafe_no_jsmanaged_fields!(WebGLQueryParameterHandler);
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