dom/canvas/WebGLContextUtils.h

   1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #ifndef WEBGLCONTEXTUTILS_H_
   7 #define WEBGLCONTEXTUTILS_H_
   8
   9 #include "WebGLContext.h"
  10 #include "mozilla/Assertions.h"
  11 #include "mozilla/dom/BindingUtils.h"
  12
  13 namespace mozilla {
  14
  15 bool IsGLDepthFormat(GLenum webGLFormat);
  16 bool IsGLDepthStencilFormat(GLenum webGLFormat);
  17 bool FormatHasAlpha(GLenum webGLFormat);
  18 void DriverFormatsFromFormatAndType(gl::GLContext* gl, GLenum webGLFormat, GLenum webGLType,
  19                                     GLenum* out_driverInternalFormat, GLenum* out_driverFormat);
  20 GLenum DriverTypeFromType(gl::GLContext* gl, GLenum webGLType);
  21
  22 struct GLComponents
  23 {
  24     unsigned char mComponents;
  25
  26     enum Components {
  27         Red     = (1 << 0),
  28         Green   = (1 << 1),
  29         Blue    = (1 << 2),
  30         Alpha   = (1 << 3),
  31         Stencil = (1 << 4),
  32         Depth   = (1 << 5),
  33     };
  34
  35     GLComponents()
  36         : mComponents(0)
  37     { }
  38
  39     GLComponents(GLenum format);
  40
  41     // Returns true iff other has all (or more) of
  42     // the components present in this GLComponents
  43     bool IsSubsetOf(const GLComponents& other) const;
  44 };
  45
  46 template <typename WebGLObjectType>
  47 JS::Value
  48 WebGLContext::WebGLObjectAsJSValue(JSContext *cx, const WebGLObjectType *object, ErrorResult& rv) const
  49 {
  50     if (!object) {
  51         return JS::NullValue();
  52     }
  53     MOZ_ASSERT(this == object->Context());
  54     JS::Rooted<JS::Value> v(cx);
  55     JS::Rooted<JSObject*> wrapper(cx, GetWrapper());
  56     JSAutoCompartment ac(cx, wrapper);
  57     if (!dom::WrapNewBindingObject(cx, const_cast<WebGLObjectType*>(object), &v)) {
  58         rv.Throw(NS_ERROR_FAILURE);
  59         return JS::NullValue();
  60     }
  61     return v;
  62 }
  63
  64 template <typename WebGLObjectType>
  65 JSObject*
  66 WebGLContext::WebGLObjectAsJSObject(JSContext *cx, const WebGLObjectType *object, ErrorResult& rv) const
  67 {
  68     JS::Value v = WebGLObjectAsJSValue(cx, object, rv);
  69     if (v.isNull()) {
  70         return nullptr;
  71     }
  72     return &v.toObject();
  73 }
  74
  75 } // namespace mozilla
  76
  77 #endif // WEBGLCONTEXTUTILS_H_