dom/canvas/WebGLVertexArray.cpp

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   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 #include "WebGLVertexArray.h"
   7
   8 #include "GLContext.h"
   9 #include "mozilla/dom/WebGLRenderingContextBinding.h"
  10 #include "WebGLBuffer.h"
  11 #include "WebGLContext.h"
  12 #include "WebGLVertexArrayGL.h"
  13 #include "WebGLVertexArrayFake.h"
  14
  15 namespace mozilla {
  16
  17 WebGLVertexArray* WebGLVertexArray::Create(WebGLContext* webgl) {
  18   if (webgl->gl->IsSupported(gl::GLFeature::vertex_array_object)) {
  19     return new WebGLVertexArrayGL(webgl);
  20   }
  21   return new WebGLVertexArrayFake(webgl);
  22 }
  23
  24 WebGLVertexArray::WebGLVertexArray(WebGLContext* const webgl)
  25     : WebGLContextBoundObject(webgl) {
  26   const webgl::VertAttribPointerDesc defaultDesc;
  27   const webgl::VertAttribPointerCalculated defaultCalc;
  28   for (const auto i : IntegerRange(mContext->MaxVertexAttribs())) {
  29     AttribPointer(i, nullptr, defaultDesc, defaultCalc);
  30   }
  31 }
  32
  33 WebGLVertexArray::~WebGLVertexArray() = default;
  34
  35 Maybe<double> WebGLVertexArray::GetVertexAttrib(const uint32_t index,
  36                                                 const GLenum pname) const {
  37   const auto& binding = mBindings[index];
  38   const auto& desc = mDescs[index];
  39
  40   switch (pname) {
  41     case LOCAL_GL_VERTEX_ATTRIB_ARRAY_STRIDE:
  42       return Some(desc.byteStrideOrZero);
  43
  44     case LOCAL_GL_VERTEX_ATTRIB_ARRAY_SIZE:
  45       return Some(desc.channels);
  46
  47     case LOCAL_GL_VERTEX_ATTRIB_ARRAY_TYPE:
  48       return Some(desc.type);
  49
  50     case LOCAL_GL_VERTEX_ATTRIB_ARRAY_INTEGER:
  51       return Some(desc.intFunc);
  52
  53     case LOCAL_GL_VERTEX_ATTRIB_ARRAY_DIVISOR:
  54       return Some(binding.layout.divisor);
  55
  56     case LOCAL_GL_VERTEX_ATTRIB_ARRAY_ENABLED:
  57       return Some(binding.layout.isArray);
  58
  59     case LOCAL_GL_VERTEX_ATTRIB_ARRAY_NORMALIZED:
  60       return Some(desc.normalized);
  61
  62     case LOCAL_GL_VERTEX_ATTRIB_ARRAY_POINTER:
  63       return Some(binding.layout.byteOffset);
  64
  65     default:
  66       return {};
  67   }
  68 }
  69
  70 }  // namespace mozilla