gecko-dev/dom/canvas/WebGLContextUtils.h

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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/. */

#ifndef WEBGLCONTEXTUTILS_H_
#define WEBGLCONTEXTUTILS_H_

#include "WebGLContext.h"
#include "mozilla/Assertions.h"
#include "mozilla/dom/BindingUtils.h"

namespace mozilla {

bool IsGLDepthFormat(GLenum webGLFormat);
bool IsGLDepthStencilFormat(GLenum webGLFormat);
bool FormatHasAlpha(GLenum webGLFormat);
void DriverFormatsFromFormatAndType(gl::GLContext* gl, GLenum webGLFormat, GLenum webGLType,
                                    GLenum* out_driverInternalFormat, GLenum* out_driverFormat);
GLenum DriverTypeFromType(gl::GLContext* gl, GLenum webGLType);

template <typename WebGLObjectType>
JS::Value
WebGLContext::WebGLObjectAsJSValue(JSContext *cx, const WebGLObjectType *object, ErrorResult& rv) const
{
    if (!object) {
        return JS::NullValue();
    }
    MOZ_ASSERT(this == object->Context());
    JS::Rooted<JS::Value> v(cx);
    JS::Rooted<JSObject*> wrapper(cx, GetWrapper());
    JSAutoCompartment ac(cx, wrapper);
    if (!dom::WrapNewBindingObject(cx, const_cast<WebGLObjectType*>(object), &v)) {
        rv.Throw(NS_ERROR_FAILURE);
        return JS::NullValue();
    }
    return v;
}

template <typename WebGLObjectType>
JSObject*
WebGLContext::WebGLObjectAsJSObject(JSContext *cx, const WebGLObjectType *object, ErrorResult& rv) const
{
    JS::Value v = WebGLObjectAsJSValue(cx, object, rv);
    if (v.isNull()) {
        return nullptr;
    }
    return &v.toObject();
}

} // namespace mozilla

#endif // WEBGLCONTEXTUTILS_H_