The Tor Browser: content/canvas/src/WebGLRenderbuffer.cpp@6474c204b198 (annotated)

content/canvas/src/WebGLRenderbuffer.cpp@6474c204b198 (annotated)

content/canvas/src/WebGLRenderbuffer.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include "WebGLContext.h"
 #include "WebGLRenderbuffer.h"
 #include "WebGLTexture.h"
 #include "mozilla/dom/WebGLRenderingContextBinding.h"
 #include "GLContext.h"
 #include "ScopedGLHelpers.h"
 using namespace mozilla;
 using namespace mozilla::gl;
 static GLenum
 DepthStencilDepthFormat(GLContext* gl) {
     // We might not be able to get 24-bit, so let's pretend!
     if (gl->IsGLES() && !gl->IsExtensionSupported(gl::GLContext::OES_depth24))
         return LOCAL_GL_DEPTH_COMPONENT16;
     return LOCAL_GL_DEPTH_COMPONENT24;
 }
 static bool
 SupportsDepthStencil(GLContext* gl) {
     return gl->IsExtensionSupported(GLContext::EXT_packed_depth_stencil) ||
            gl->IsExtensionSupported(GLContext::OES_packed_depth_stencil);
 }
 static bool
 NeedsDepthStencilEmu(GLContext* gl, GLenum internalFormat) {
     MOZ_ASSERT(internalFormat != LOCAL_GL_DEPTH_STENCIL);
     if (internalFormat != LOCAL_GL_DEPTH24_STENCIL8)
         return false;
     return !SupportsDepthStencil(gl);
 }
 JSObject*
 WebGLRenderbuffer::WrapObject(JSContext *cx) {
     return dom::WebGLRenderbufferBinding::Wrap(cx, this);
 }
 WebGLRenderbuffer::WebGLRenderbuffer(WebGLContext *context)
     : WebGLContextBoundObject(context)
     , mPrimaryRB(0)
     , mSecondaryRB(0)
     , mInternalFormat(0)
     , mInternalFormatForGL(0)
     , mHasEverBeenBound(false)
     , mImageDataStatus(WebGLImageDataStatus::NoImageData)
 {
     SetIsDOMBinding();
     mContext->MakeContextCurrent();
     mContext->gl->fGenRenderbuffers(1, &mPrimaryRB);
     if (!SupportsDepthStencil(mContext->gl))
         mContext->gl->fGenRenderbuffers(1, &mSecondaryRB);
     mContext->mRenderbuffers.insertBack(this);
 }
 void
 WebGLRenderbuffer::Delete() {
     mContext->MakeContextCurrent();
     mContext->gl->fDeleteRenderbuffers(1, &mPrimaryRB);
     if (mSecondaryRB)
         mContext->gl->fDeleteRenderbuffers(1, &mSecondaryRB);
     LinkedListElement<WebGLRenderbuffer>::removeFrom(mContext->mRenderbuffers);
 }
 int64_t
 WebGLRenderbuffer::MemoryUsage() const {
     int64_t pixels = int64_t(Width()) * int64_t(Height());
     GLenum primaryFormat = InternalFormatForGL();
     // If there is no defined format, we're not taking up any memory
     if (!primaryFormat) {
         return 0;
     }
     int64_t secondarySize = 0;
     if (mSecondaryRB) {
         if (NeedsDepthStencilEmu(mContext->gl, primaryFormat)) {
             primaryFormat = DepthStencilDepthFormat(mContext->gl);
             secondarySize = 1*pixels; // STENCIL_INDEX8
         } else {
             secondarySize = 1*1*2; // 1x1xRGBA4
         }
     }
     int64_t primarySize = 0;
     switch (primaryFormat) {
         case LOCAL_GL_STENCIL_INDEX8:
             primarySize = 1*pixels;
             break;
         case LOCAL_GL_RGBA4:
         case LOCAL_GL_RGB5_A1:
         case LOCAL_GL_RGB565:
         case LOCAL_GL_DEPTH_COMPONENT16:
             primarySize = 2*pixels;
             break;
         case LOCAL_GL_RGB8:
         case LOCAL_GL_DEPTH_COMPONENT24:
             primarySize = 3*pixels;
             break;
         case LOCAL_GL_RGBA8:
         case LOCAL_GL_SRGB8_ALPHA8_EXT:
         case LOCAL_GL_DEPTH24_STENCIL8:
         case LOCAL_GL_DEPTH_COMPONENT32:
             primarySize = 4*pixels;
             break;
         case LOCAL_GL_RGB16F:
             primarySize = 2*3*pixels;
             break;
         case LOCAL_GL_RGBA16F:
             primarySize = 2*4*pixels;
             break;
         case LOCAL_GL_RGB32F:
             primarySize = 4*3*pixels;
             break;
         case LOCAL_GL_RGBA32F:
             primarySize = 4*4*pixels;
             break;
         default:
             MOZ_ASSERT(false, "Unknown `primaryFormat`.");
             break;
     }
     return primarySize + secondarySize;
 }
 void
 WebGLRenderbuffer::BindRenderbuffer() const {
     /* Do this explicitly here, since the meaning changes for depth-stencil emu.
      * Under normal circumstances, there's only one RB: `mPrimaryRB`.
      * `mSecondaryRB` is used when we have to pretend that the renderbuffer is
      * DEPTH_STENCIL, when it's actually one DEPTH buffer `mPrimaryRB` and one
      * STENCIL buffer `mSecondaryRB`.
      *
      * In the DEPTH_STENCIL emulation case, we're actually juggling two RBs, but
      * we can only bind one of them at a time. We choose to unconditionally bind
      * the depth RB. When we need to ask about the stencil buffer (say, how many
      * stencil bits we have), we temporarily bind the stencil RB, so that it
      * looks like we're just asking the question of a combined DEPTH_STENCIL
      * buffer.
      */
     mContext->gl->fBindRenderbuffer(LOCAL_GL_RENDERBUFFER, mPrimaryRB);
 }
 void
 WebGLRenderbuffer::RenderbufferStorage(GLenum internalFormat, GLsizei width, GLsizei height) const {
     GLContext* gl = mContext->gl;
     GLenum primaryFormat = internalFormat;
     GLenum secondaryFormat = 0;
     if (NeedsDepthStencilEmu(mContext->gl, primaryFormat)) {
         primaryFormat = DepthStencilDepthFormat(gl);
         secondaryFormat = LOCAL_GL_STENCIL_INDEX8;
     }
     gl->fRenderbufferStorage(LOCAL_GL_RENDERBUFFER, primaryFormat, width, height);
     if (!mSecondaryRB) {
         MOZ_ASSERT(!secondaryFormat);
         return;
     }
     // We can't leave the secondary RB unspecified either, since we should
     // handle the case where we attach a non-depth-stencil RB to a
     // depth-stencil attachment point, or attach this depth-stencil RB to a
     // non-depth-stencil attachment point.
     ScopedBindRenderbuffer autoRB(gl, mSecondaryRB);
     if (secondaryFormat) {
         gl->fRenderbufferStorage(LOCAL_GL_RENDERBUFFER, secondaryFormat, width, height);
     } else {
         gl->fRenderbufferStorage(LOCAL_GL_RENDERBUFFER, LOCAL_GL_RGBA4, 1, 1);
     }
 }
 void
 WebGLRenderbuffer::FramebufferRenderbuffer(GLenum attachment) const {
     GLContext* gl = mContext->gl;
     if (attachment != LOCAL_GL_DEPTH_STENCIL_ATTACHMENT) {
         gl->fFramebufferRenderbuffer(LOCAL_GL_FRAMEBUFFER, attachment, LOCAL_GL_RENDERBUFFER, mPrimaryRB);
         return;
     }
     GLuint stencilRB = mPrimaryRB;
     if (NeedsDepthStencilEmu(mContext->gl, InternalFormatForGL())) {
         printf_stderr("DEV-ONLY: Using secondary buffer to emulate DepthStencil.\n");
         MOZ_ASSERT(mSecondaryRB);
         stencilRB = mSecondaryRB;
     }
     gl->fFramebufferRenderbuffer(LOCAL_GL_FRAMEBUFFER, LOCAL_GL_DEPTH_ATTACHMENT,   LOCAL_GL_RENDERBUFFER, mPrimaryRB);
     gl->fFramebufferRenderbuffer(LOCAL_GL_FRAMEBUFFER, LOCAL_GL_STENCIL_ATTACHMENT, LOCAL_GL_RENDERBUFFER, stencilRB);
 }
 GLint
 WebGLRenderbuffer::GetRenderbufferParameter(GLenum target, GLenum pname) const {
     GLContext* gl = mContext->gl;
     switch (pname) {
         case LOCAL_GL_RENDERBUFFER_STENCIL_SIZE: {
             if (NeedsDepthStencilEmu(mContext->gl, InternalFormatForGL())) {
                 if (gl->WorkAroundDriverBugs() &&
                     gl->Renderer() == GLRenderer::Tegra)
                 {
                     return 8;
                 }
                 ScopedBindRenderbuffer autoRB(gl, mSecondaryRB);
                 GLint i = 0;
                 gl->fGetRenderbufferParameteriv(target, pname, &i);
                 return i;
             }
             // Fall through otherwise.
         }
         case LOCAL_GL_RENDERBUFFER_WIDTH:
         case LOCAL_GL_RENDERBUFFER_HEIGHT:
         case LOCAL_GL_RENDERBUFFER_RED_SIZE:
         case LOCAL_GL_RENDERBUFFER_GREEN_SIZE:
         case LOCAL_GL_RENDERBUFFER_BLUE_SIZE:
         case LOCAL_GL_RENDERBUFFER_ALPHA_SIZE:
         case LOCAL_GL_RENDERBUFFER_DEPTH_SIZE: {
             GLint i = 0;
             gl->fGetRenderbufferParameteriv(target, pname, &i);
             return i;
         }
     }
     MOZ_ASSERT(false, "This function should only be called with valid `pname`.");
     return 0;
 }
 NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_0(WebGLRenderbuffer)
 NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(WebGLRenderbuffer, AddRef)
 NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(WebGLRenderbuffer, Release)

The Tor Browser / annotate

content/canvas/src/WebGLRenderbuffer.cpp@6474c204b198 (annotated)

content/canvas/src/WebGLRenderbuffer.cpp