dom/canvas/WebGLVertexArrayFake.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 "WebGLVertexArrayFake.h"
   7
   8 #include "GLContext.h"
   9 #include "WebGLBuffer.h"
  10 #include "WebGLContext.h"
  11
  12 namespace mozilla {
  13
  14 WebGLVertexArrayFake::WebGLVertexArrayFake(WebGLContext* webgl)
  15     : WebGLVertexArray(webgl) {}
  16
  17 void WebGLVertexArrayFake::BindVertexArray() {
  18   // Go through and re-bind all buffers and setup all
  19   // vertex attribute pointers
  20   const auto& gl = mContext->gl;
  21
  22   mContext->mBoundVertexArray = this;
  23
  24   static_assert(IsBufferTargetLazilyBound(LOCAL_GL_ARRAY_BUFFER));
  25   static_assert(!IsBufferTargetLazilyBound(LOCAL_GL_ELEMENT_ARRAY_BUFFER));
  26
  27   const auto fnBind = [&](const GLenum target, WebGLBuffer* const buffer) {
  28     gl->fBindBuffer(target, buffer ? buffer->mGLName : 0);
  29   };
  30
  31   fnBind(LOCAL_GL_ELEMENT_ARRAY_BUFFER, mElementArrayBuffer);
  32
  33   const bool useDivisor =
  34       mContext->IsWebGL2() ||
  35       mContext->IsExtensionEnabled(WebGLExtensionID::ANGLE_instanced_arrays);
  36
  37   for (const auto i : IntegerRange(mContext->MaxVertexAttribs())) {
  38     const auto& binding = mBindings[i];
  39     const auto& desc = mDescs[i];
  40
  41     if (binding.layout.isArray) {
  42       gl->fEnableVertexAttribArray(i);
  43     } else {
  44       gl->fDisableVertexAttribArray(i);
  45     }
  46
  47     if (useDivisor) {
  48       gl->fVertexAttribDivisor(i, binding.layout.divisor);
  49     }
  50
  51     fnBind(LOCAL_GL_ARRAY_BUFFER, binding.buffer);
  52     DoVertexAttribPointer(*gl, i, desc);
  53   }
  54
  55   fnBind(LOCAL_GL_ARRAY_BUFFER, nullptr);
  56 }
  57
  58 }  // namespace mozilla