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       1             : /* -*- Mode: C++; tab-width: 4; 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 WEBGL_ACTIVE_INFO_H_
       7             : #define WEBGL_ACTIVE_INFO_H_
       8             : 
       9             : #include "GLDefs.h"
      10             : #include "mozilla/Attributes.h"
      11             : #include "nsCycleCollectionParticipant.h" // NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS
      12             : #include "nsISupportsImpl.h" // NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING
      13             : #include "nsString.h"
      14             : #include "nsWrapperCache.h"
      15             : 
      16             : namespace mozilla {
      17             : 
      18             : class WebGLContext;
      19             : 
      20             : class WebGLActiveInfo final
      21             :     : public nsWrapperCache
      22             : {
      23             : public:
      24           0 :     NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(WebGLActiveInfo)
      25           0 :     NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(WebGLActiveInfo)
      26             : 
      27             :     virtual JSObject* WrapObject(JSContext* js, JS::Handle<JSObject*> givenProto) override;
      28             : 
      29           0 :     WebGLContext* GetParentObject() const {
      30           0 :         return mWebGL;
      31             :     }
      32             : 
      33             :     WebGLContext* const mWebGL;
      34             : 
      35             :     // ActiveInfo state:
      36             :     const uint32_t mElemCount; // `size`
      37             :     const GLenum mElemType; // `type`
      38             :     const nsCString mBaseUserName; // `name`, but ASCII, and without any final "[0]".
      39             : 
      40             :     // Not actually part of ActiveInfo:
      41             :     const bool mIsArray;
      42             :     const uint8_t mElemSize;
      43             :     const nsCString mBaseMappedName; // Without any final "[0]".
      44             : 
      45             :     bool IsSampler() const;
      46             : 
      47             :     WebGLActiveInfo(WebGLContext* webgl, GLint elemCount, GLenum elemType, bool isArray,
      48             :                     const nsACString& baseUserName, const nsACString& baseMappedName);
      49             : 
      50             :     /* GLES 2.0.25, p33:
      51             :      *   This command will return as much information about active
      52             :      *   attributes as possible. If no information is available, length will
      53             :      *   be set to zero and name will be an empty string. This situation
      54             :      *   could arise if GetActiveAttrib is issued after a failed link.
      55             :      *
      56             :      * It's the same for GetActiveUniform.
      57             :      */
      58           0 :     static WebGLActiveInfo* CreateInvalid(WebGLContext* webgl) {
      59           0 :         return new WebGLActiveInfo(webgl);
      60             :     }
      61             : 
      62             :     // WebIDL attributes
      63           0 :     GLint Size() const {
      64           0 :         return mElemCount;
      65             :     }
      66             : 
      67           0 :     GLenum Type() const {
      68           0 :         return mElemType;
      69             :     }
      70             : 
      71           0 :     void GetName(nsString& retval) const {
      72           0 :         CopyASCIItoUTF16(mBaseUserName, retval);
      73           0 :         if (mIsArray)
      74           0 :             retval.AppendLiteral("[0]");
      75           0 :     }
      76             : 
      77             : private:
      78           0 :     explicit WebGLActiveInfo(WebGLContext* webgl)
      79           0 :         : mWebGL(webgl)
      80             :         , mElemCount(0)
      81             :         , mElemType(0)
      82             :         , mBaseUserName("")
      83             :         , mIsArray(false)
      84             :         , mElemSize(0)
      85           0 :         , mBaseMappedName("")
      86           0 :     { }
      87             : 
      88             :     // Private destructor, to discourage deletion outside of Release():
      89           0 :     ~WebGLActiveInfo() { }
      90             : };
      91             : 
      92             : //////////
      93             : 
      94             : bool IsElemTypeSampler(GLenum elemType);
      95             : 
      96             : } // namespace mozilla
      97             : 
      98             : #endif // WEBGL_ACTIVE_INFO_H_