content/canvas/src/WebGLVertexAttribData.h

   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 WEBGLVERTEXATTRIBDATA_H_
   7 #define WEBGLVERTEXATTRIBDATA_H_
   8
   9 namespace mozilla {
  10
  11 class WebGLBuffer;
  12
  13 struct WebGLVertexAttribData {
  14     // note that these initial values are what GL initializes vertex attribs to
  15     WebGLVertexAttribData()
  16         : buf(0)
  17         , stride(0)
  18         , size(4)
  19         , divisor(0) // OpenGL ES 3.0 specs paragraphe 6.2 p240
  20         , byteOffset(0)
  21         , type(LOCAL_GL_FLOAT)
  22         , enabled(false)
  23         , normalized(false)
  24     { }
  25
  26     WebGLRefPtr<WebGLBuffer> buf;
  27     GLuint stride;
  28     GLuint size;
  29     GLuint divisor;
  30     GLuint byteOffset;
  31     GLenum type;
  32     bool enabled;
  33     bool normalized;
  34
  35     GLuint componentSize() const {
  36         switch(type) {
  37             case LOCAL_GL_BYTE:
  38                 return sizeof(GLbyte);
  39                 break;
  40             case LOCAL_GL_UNSIGNED_BYTE:
  41                 return sizeof(GLubyte);
  42                 break;
  43             case LOCAL_GL_SHORT:
  44                 return sizeof(GLshort);
  45                 break;
  46             case LOCAL_GL_UNSIGNED_SHORT:
  47                 return sizeof(GLushort);
  48                 break;
  49             // XXX case LOCAL_GL_FIXED:
  50             case LOCAL_GL_FLOAT:
  51                 return sizeof(GLfloat);
  52                 break;
  53             default:
  54                 NS_ERROR("Should never get here!");
  55                 return 0;
  56         }
  57     }
  58
  59     GLuint actualStride() const {
  60         if (stride) return stride;
  61         return size * componentSize();
  62     }
  63 };
  64
  65 } // namespace mozilla
  66
  67 inline void ImplCycleCollectionUnlink(mozilla::WebGLVertexAttribData& aField)
  68 {
  69   aField.buf = nullptr;
  70 }
  71
  72 inline void
  73 ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& aCallback,
  74                             mozilla::WebGLVertexAttribData& aField,
  75                             const char* aName,
  76                             uint32_t aFlags = 0)
  77 {
  78   CycleCollectionNoteChild(aCallback, aField.buf.get(), aName, aFlags);
  79 }
  80
  81 #endif