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

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

content/canvas/src/WebGLFramebuffer.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 "WebGLFramebuffer.h"
 #include "WebGLExtensions.h"
 #include "WebGLRenderbuffer.h"
 #include "WebGLTexture.h"
 #include "mozilla/dom/WebGLRenderingContextBinding.h"
 #include "WebGLTexture.h"
 #include "WebGLRenderbuffer.h"
 #include "GLContext.h"
 #include "WebGLContextUtils.h"
 using namespace mozilla;
 using namespace mozilla::gl;
 JSObject*
 WebGLFramebuffer::WrapObject(JSContext* cx)
 {
     return dom::WebGLFramebufferBinding::Wrap(cx, this);
 }
 WebGLFramebuffer::WebGLFramebuffer(WebGLContext* context)
     : WebGLContextBoundObject(context)
     , mStatus(0)
     , mHasEverBeenBound(false)
     , mDepthAttachment(LOCAL_GL_DEPTH_ATTACHMENT)
     , mStencilAttachment(LOCAL_GL_STENCIL_ATTACHMENT)
     , mDepthStencilAttachment(LOCAL_GL_DEPTH_STENCIL_ATTACHMENT)
 {
     SetIsDOMBinding();
     mContext->MakeContextCurrent();
     mContext->gl->fGenFramebuffers(1, &mGLName);
     mContext->mFramebuffers.insertBack(this);
     mColorAttachments.SetLength(1);
     mColorAttachments[0].mAttachmentPoint = LOCAL_GL_COLOR_ATTACHMENT0;
 }
 bool
 WebGLFramebuffer::Attachment::IsDeleteRequested() const
 {
     return Texture() ? Texture()->IsDeleteRequested()
          : Renderbuffer() ? Renderbuffer()->IsDeleteRequested()
          : false;
 }
 bool
 WebGLFramebuffer::Attachment::HasAlpha() const
 {
     MOZ_ASSERT(HasImage());
     GLenum format = 0;
     if (Texture() && Texture()->HasImageInfoAt(mTexImageTarget, mTexImageLevel))
         format = Texture()->ImageInfoAt(mTexImageTarget, mTexImageLevel).WebGLFormat();
     else if (Renderbuffer())
         format = Renderbuffer()->InternalFormat();
     return FormatHasAlpha(format);
 }
 bool
 WebGLFramebuffer::Attachment::IsReadableFloat() const
 {
     if (Texture() && Texture()->HasImageInfoAt(mTexImageTarget, mTexImageLevel)) {
         GLenum type = Texture()->ImageInfoAt(mTexImageTarget, mTexImageLevel).WebGLType();
         switch (type) {
         case LOCAL_GL_FLOAT:
         case LOCAL_GL_HALF_FLOAT_OES:
             return true;
         }
         return false;
     }
     if (Renderbuffer()) {
         GLenum format = Renderbuffer()->InternalFormat();
         switch (format) {
         case LOCAL_GL_RGB16F:
         case LOCAL_GL_RGBA16F:
         case LOCAL_GL_RGB32F:
         case LOCAL_GL_RGBA32F:
             return true;
         }
         return false;
     }
     MOZ_ASSERT(false, "Should not get here.");
     return false;
 }
 void
 WebGLFramebuffer::Attachment::SetTexImage(WebGLTexture* tex, GLenum target, GLint level)
 {
     mTexturePtr = tex;
     mRenderbufferPtr = nullptr;
     mTexImageTarget = target;
     mTexImageLevel = level;
     mNeedsFinalize = true;
 }
 void
 WebGLFramebuffer::Attachment::SetRenderbuffer(WebGLRenderbuffer* rb)
 {
     mTexturePtr = nullptr;
     mRenderbufferPtr = rb;
     mNeedsFinalize = true;
 }
 bool
 WebGLFramebuffer::Attachment::HasUninitializedImageData() const
 {
     if (!HasImage())
         return false;
     if (Renderbuffer()) {
         return Renderbuffer()->HasUninitializedImageData();
     }
     if (Texture()) {
         MOZ_ASSERT(Texture()->HasImageInfoAt(mTexImageTarget, mTexImageLevel));
         return Texture()->ImageInfoAt(mTexImageTarget, mTexImageLevel).HasUninitializedImageData();
     }
     MOZ_ASSERT(false, "Should not get here.");
     return false;
 }
 void
 WebGLFramebuffer::Attachment::SetImageDataStatus(WebGLImageDataStatus newStatus)
 {
     if (!HasImage())
         return;
     if (Renderbuffer()) {
         Renderbuffer()->SetImageDataStatus(newStatus);
         return;
     }
     if (Texture()) {
         Texture()->SetImageDataStatus(mTexImageTarget, mTexImageLevel, newStatus);
         return;
     }
     MOZ_ASSERT(false, "Should not get here.");
 }
 bool
 WebGLFramebuffer::Attachment::HasImage() const
 {
     if (Texture() && Texture()->HasImageInfoAt(mTexImageTarget, mTexImageLevel))
         return true;
     if (Renderbuffer())
         return true;
     return false;
 }
 const WebGLRectangleObject&
 WebGLFramebuffer::Attachment::RectangleObject() const
 {
     MOZ_ASSERT(HasImage(), "Make sure it has an image before requesting the rectangle.");
     if (Texture()) {
         MOZ_ASSERT(Texture()->HasImageInfoAt(mTexImageTarget, mTexImageLevel));
         return Texture()->ImageInfoAt(mTexImageTarget, mTexImageLevel);
     }
     if (Renderbuffer()) {
         return *Renderbuffer();
     }
     MOZ_CRASH("Should not get here.");
 }
 /* The following IsValidFBOTextureXXX functions check the internal
    format that is used by GL or GL ES texture formats.  This
    corresponds to the state that is stored in
    WebGLTexture::ImageInfo::InternalFormat()*/
 static inline bool
 IsValidFBOTextureColorFormat(GLenum internalFormat)
 {
     /* These formats are internal formats for each texture -- the actual
      * low level format, which we might have to do conversions for when
      * running against desktop GL (e.g. GL_RGBA + GL_FLOAT -> GL_RGBA32F).
      *
      * This function just handles all of them whether desktop GL or ES.
      */
     return (
         /* linear 8-bit formats */
         internalFormat == LOCAL_GL_ALPHA ||
         internalFormat == LOCAL_GL_LUMINANCE ||
         internalFormat == LOCAL_GL_LUMINANCE_ALPHA ||
         internalFormat == LOCAL_GL_RGB ||
         internalFormat == LOCAL_GL_RGBA ||
         /* sRGB 8-bit formats */
         internalFormat == LOCAL_GL_SRGB_EXT ||
         internalFormat == LOCAL_GL_SRGB_ALPHA_EXT ||
         /* linear float32 formats */
         internalFormat == LOCAL_GL_ALPHA32F_ARB ||
         internalFormat == LOCAL_GL_LUMINANCE32F_ARB ||
         internalFormat == LOCAL_GL_LUMINANCE_ALPHA32F_ARB ||
         internalFormat == LOCAL_GL_RGB32F_ARB ||
         internalFormat == LOCAL_GL_RGBA32F_ARB ||
         /* texture_half_float formats */
         internalFormat == LOCAL_GL_ALPHA16F_ARB ||
         internalFormat == LOCAL_GL_LUMINANCE16F_ARB ||
         internalFormat == LOCAL_GL_LUMINANCE_ALPHA16F_ARB ||
         internalFormat == LOCAL_GL_RGB16F_ARB ||
         internalFormat == LOCAL_GL_RGBA16F_ARB
     );
 }
 static inline bool
 IsValidFBOTextureDepthFormat(GLenum internalFormat)
 {
     return (
         internalFormat == LOCAL_GL_DEPTH_COMPONENT ||
         internalFormat == LOCAL_GL_DEPTH_COMPONENT16 ||
         internalFormat == LOCAL_GL_DEPTH_COMPONENT32);
 }
 static inline bool
 IsValidFBOTextureDepthStencilFormat(GLenum internalFormat)
 {
     return (
         internalFormat == LOCAL_GL_DEPTH_STENCIL ||
         internalFormat == LOCAL_GL_DEPTH24_STENCIL8);
 }
 /* The following IsValidFBORenderbufferXXX functions check the internal
    format that is stored by WebGLRenderbuffer::InternalFormat(). Valid
    values can be found in WebGLContext::RenderbufferStorage. */
 static inline bool
 IsValidFBORenderbufferColorFormat(GLenum internalFormat)
 {
     return (
         internalFormat == LOCAL_GL_RGB565 ||
         internalFormat == LOCAL_GL_RGB5_A1 ||
         internalFormat == LOCAL_GL_RGBA4 ||
         internalFormat == LOCAL_GL_SRGB8_ALPHA8_EXT);
 }
 static inline bool
 IsValidFBORenderbufferDepthFormat(GLenum internalFormat)
 {
     return internalFormat == LOCAL_GL_DEPTH_COMPONENT16;
 }
 static inline bool
 IsValidFBORenderbufferDepthStencilFormat(GLenum internalFormat)
 {
     return internalFormat == LOCAL_GL_DEPTH_STENCIL;
 }
 static inline bool
 IsValidFBORenderbufferStencilFormat(GLenum internalFormat)
 {
     return internalFormat == LOCAL_GL_STENCIL_INDEX8;
 }
 bool
 WebGLFramebuffer::Attachment::IsComplete() const
 {
     if (!HasImage())
         return false;
     const WebGLRectangleObject& rect = RectangleObject();
     if (!rect.Width() ||
         !rect.Height())
     {
         return false;
     }
     if (Texture()) {
         MOZ_ASSERT(Texture()->HasImageInfoAt(mTexImageTarget, mTexImageLevel));
         const WebGLTexture::ImageInfo& imageInfo =
             Texture()->ImageInfoAt(mTexImageTarget, mTexImageLevel);
         GLenum webGLFormat = imageInfo.WebGLFormat();
         if (mAttachmentPoint == LOCAL_GL_DEPTH_ATTACHMENT)
             return IsValidFBOTextureDepthFormat(webGLFormat);
         if (mAttachmentPoint == LOCAL_GL_DEPTH_STENCIL_ATTACHMENT)
             return IsValidFBOTextureDepthStencilFormat(webGLFormat);
         if (mAttachmentPoint >= LOCAL_GL_COLOR_ATTACHMENT0 &&
             mAttachmentPoint < GLenum(LOCAL_GL_COLOR_ATTACHMENT0 +
                                       WebGLContext::sMaxColorAttachments))
         {
             return IsValidFBOTextureColorFormat(webGLFormat);
         }
         MOZ_ASSERT(false, "Invalid WebGL attachment point?");
         return false;
     }
     if (Renderbuffer()) {
         GLenum internalFormat = Renderbuffer()->InternalFormat();
         if (mAttachmentPoint == LOCAL_GL_DEPTH_ATTACHMENT)
             return IsValidFBORenderbufferDepthFormat(internalFormat);
         if (mAttachmentPoint == LOCAL_GL_STENCIL_ATTACHMENT)
             return IsValidFBORenderbufferStencilFormat(internalFormat);
         if (mAttachmentPoint == LOCAL_GL_DEPTH_STENCIL_ATTACHMENT)
             return IsValidFBORenderbufferDepthStencilFormat(internalFormat);
         if (mAttachmentPoint >= LOCAL_GL_COLOR_ATTACHMENT0 &&
             mAttachmentPoint < GLenum(LOCAL_GL_COLOR_ATTACHMENT0 +
                                       WebGLContext::sMaxColorAttachments))
         {
             return IsValidFBORenderbufferColorFormat(internalFormat);
         }
         MOZ_ASSERT(false, "Invalid WebGL attachment point?");
         return false;
     }
     MOZ_ASSERT(false, "Should not get here.");
     return false;
 }
 void
 WebGLFramebuffer::Attachment::FinalizeAttachment(GLContext* gl, GLenum attachmentLoc) const
 {
     if (!mNeedsFinalize)
         return;
     mNeedsFinalize = false;
     if (!HasImage()) {
         if (attachmentLoc == LOCAL_GL_DEPTH_STENCIL_ATTACHMENT) {
             gl->fFramebufferRenderbuffer(LOCAL_GL_FRAMEBUFFER, LOCAL_GL_DEPTH_ATTACHMENT,
                                          LOCAL_GL_RENDERBUFFER, 0);
             gl->fFramebufferRenderbuffer(LOCAL_GL_FRAMEBUFFER, LOCAL_GL_STENCIL_ATTACHMENT,
                                          LOCAL_GL_RENDERBUFFER, 0);
         } else {
             gl->fFramebufferRenderbuffer(LOCAL_GL_FRAMEBUFFER, attachmentLoc,
                                          LOCAL_GL_RENDERBUFFER, 0);
         }
         return;
     }
     MOZ_ASSERT(HasImage());
     if (Texture()) {
         MOZ_ASSERT(gl == Texture()->Context()->gl);
         if (attachmentLoc == LOCAL_GL_DEPTH_STENCIL_ATTACHMENT) {
             gl->fFramebufferTexture2D(LOCAL_GL_FRAMEBUFFER, LOCAL_GL_DEPTH_ATTACHMENT,
                                       TexImageTarget(), Texture()->GLName(), TexImageLevel());
             gl->fFramebufferTexture2D(LOCAL_GL_FRAMEBUFFER, LOCAL_GL_STENCIL_ATTACHMENT,
                                       TexImageTarget(), Texture()->GLName(), TexImageLevel());
         } else {
             gl->fFramebufferTexture2D(LOCAL_GL_FRAMEBUFFER, attachmentLoc,
                                       TexImageTarget(), Texture()->GLName(), TexImageLevel());
         }
         return;
     }
     if (Renderbuffer()) {
         Renderbuffer()->FramebufferRenderbuffer(attachmentLoc);
         return;
     }
     MOZ_ASSERT(false, "Should not get here.");
 }
 void
 WebGLFramebuffer::Delete()
 {
     DetachAllAttachments();
     mColorAttachments.Clear();
     mDepthAttachment.Reset();
     mStencilAttachment.Reset();
     mDepthStencilAttachment.Reset();
     mContext->MakeContextCurrent();
     mContext->gl->fDeleteFramebuffers(1, &mGLName);
     LinkedListElement<WebGLFramebuffer>::removeFrom(mContext->mFramebuffers);
 }
 void
 WebGLFramebuffer::DetachAttachment(WebGLFramebuffer::Attachment& attachment)
 {
     if (attachment.Texture())
         attachment.Texture()->DetachFrom(this, attachment.mAttachmentPoint);
     if (attachment.Renderbuffer())
         attachment.Renderbuffer()->DetachFrom(this, attachment.mAttachmentPoint);
 }
 void
 WebGLFramebuffer::DetachAllAttachments()
 {
     size_t count = mColorAttachments.Length();
     for (size_t i = 0; i < count; i++) {
         DetachAttachment(mColorAttachments[i]);
     }
     DetachAttachment(mDepthAttachment);
     DetachAttachment(mStencilAttachment);
     DetachAttachment(mDepthStencilAttachment);
 }
 void
 WebGLFramebuffer::FramebufferRenderbuffer(GLenum target,
                                           GLenum attachment,
                                           GLenum rbtarget,
                                           WebGLRenderbuffer* wrb)
 {
     MOZ_ASSERT(mContext->mBoundFramebuffer == this);
     if (!mContext->ValidateObjectAllowNull("framebufferRenderbuffer: renderbuffer", wrb))
         return;
     if (target != LOCAL_GL_FRAMEBUFFER)
         return mContext->ErrorInvalidEnumInfo("framebufferRenderbuffer: target", target);
     if (rbtarget != LOCAL_GL_RENDERBUFFER)
         return mContext->ErrorInvalidEnumInfo("framebufferRenderbuffer: renderbuffer target:", rbtarget);
     /* Get the requested attachment. If result is NULL, attachment is
      * invalid and an error is generated.
      *
      * Don't use GetAttachment(...) here because it opt builds it
      * returns mColorAttachment[0] for invalid attachment, which we
      * really don't want to mess with.
      */
     Attachment* a = GetAttachmentOrNull(attachment);
     if (!a)
         return; // Error generated internally to GetAttachmentOrNull.
     /* Invalidate cached framebuffer status and inform texture of it's
      * new attachment
      */
     mStatus = 0;
     // Detach current
     if (a->Texture())
         a->Texture()->DetachFrom(this, attachment);
     else if (a->Renderbuffer())
         a->Renderbuffer()->DetachFrom(this, attachment);
     // Attach new
     if (wrb)
         wrb->AttachTo(this, attachment);
     a->SetRenderbuffer(wrb);
 }
 void
 WebGLFramebuffer::FramebufferTexture2D(GLenum target,
                                        GLenum attachment,
                                        GLenum textarget,
                                        WebGLTexture* wtex,
                                        GLint level)
 {
     MOZ_ASSERT(mContext->mBoundFramebuffer == this);
     if (!mContext->ValidateObjectAllowNull("framebufferTexture2D: texture", wtex))
         return;
     if (target != LOCAL_GL_FRAMEBUFFER)
         return mContext->ErrorInvalidEnumInfo("framebufferTexture2D: target", target);
     if (textarget != LOCAL_GL_TEXTURE_2D &&
         (textarget < LOCAL_GL_TEXTURE_CUBE_MAP_POSITIVE_X ||
          textarget > LOCAL_GL_TEXTURE_CUBE_MAP_NEGATIVE_Z))
     {
         return mContext->ErrorInvalidEnumInfo("framebufferTexture2D: invalid texture target", textarget);
     }
     if (wtex) {
         bool isTexture2D = wtex->Target() == LOCAL_GL_TEXTURE_2D;
         bool isTexTarget2D = textarget == LOCAL_GL_TEXTURE_2D;
         if (isTexture2D != isTexTarget2D) {
             return mContext->ErrorInvalidOperation("framebufferTexture2D: mismatched texture and texture target");
         }
     }
     if (level != 0)
         return mContext->ErrorInvalidValue("framebufferTexture2D: level must be 0");
     /* Get the requested attachment. If result is NULL, attachment is
      * invalid and an error is generated.
      *
      * Don't use GetAttachment(...) here because it opt builds it
      * returns mColorAttachment[0] for invalid attachment, which we
      * really don't want to mess with.
      */
     Attachment* a = GetAttachmentOrNull(attachment);
     if (!a)
         return; // Error generated internally to GetAttachmentOrNull.
     /* Invalidate cached framebuffer status and inform texture of it's
      * new attachment
      */
     mStatus = 0;
     // Detach current
     if (a->Texture())
         a->Texture()->DetachFrom(this, attachment);
     else if (a->Renderbuffer())
         a->Renderbuffer()->DetachFrom(this, attachment);
     // Attach new
     if (wtex)
         wtex->AttachTo(this, attachment);
     a->SetTexImage(wtex, textarget, level);
 }
 WebGLFramebuffer::Attachment*
 WebGLFramebuffer::GetAttachmentOrNull(GLenum attachment)
 {
     if (attachment == LOCAL_GL_DEPTH_STENCIL_ATTACHMENT)
         return &mDepthStencilAttachment;
     if (attachment == LOCAL_GL_DEPTH_ATTACHMENT)
         return &mDepthAttachment;
     if (attachment == LOCAL_GL_STENCIL_ATTACHMENT)
         return &mStencilAttachment;
     if (!CheckColorAttachmentNumber(attachment, "getAttachmentOrNull"))
         return nullptr;
     size_t colorAttachmentId = attachment - LOCAL_GL_COLOR_ATTACHMENT0;
     EnsureColorAttachments(colorAttachmentId);
     return &mColorAttachments[colorAttachmentId];
 }
 const WebGLFramebuffer::Attachment&
 WebGLFramebuffer::GetAttachment(GLenum attachment) const
 {
     if (attachment == LOCAL_GL_DEPTH_STENCIL_ATTACHMENT)
         return mDepthStencilAttachment;
     if (attachment == LOCAL_GL_DEPTH_ATTACHMENT)
         return mDepthAttachment;
     if (attachment == LOCAL_GL_STENCIL_ATTACHMENT)
         return mStencilAttachment;
     if (!CheckColorAttachmentNumber(attachment, "getAttachment")) {
         MOZ_ASSERT(false);
         return mColorAttachments[0];
     }
     size_t colorAttachmentId = attachment - LOCAL_GL_COLOR_ATTACHMENT0;
     if (colorAttachmentId >= mColorAttachments.Length()) {
         MOZ_ASSERT(false);
         return mColorAttachments[0];
     }
     return mColorAttachments[colorAttachmentId];
 }
 void
 WebGLFramebuffer::DetachTexture(const WebGLTexture* tex)
 {
     size_t count = mColorAttachments.Length();
     for (size_t i = 0; i < count; i++) {
         if (mColorAttachments[i].Texture() == tex) {
             FramebufferTexture2D(LOCAL_GL_FRAMEBUFFER, LOCAL_GL_COLOR_ATTACHMENT0+i, LOCAL_GL_TEXTURE_2D, nullptr, 0);
             // a texture might be attached more that once while editing the framebuffer
         }
     }
     if (mDepthAttachment.Texture() == tex)
         FramebufferTexture2D(LOCAL_GL_FRAMEBUFFER, LOCAL_GL_DEPTH_ATTACHMENT, LOCAL_GL_TEXTURE_2D, nullptr, 0);
     if (mStencilAttachment.Texture() == tex)
         FramebufferTexture2D(LOCAL_GL_FRAMEBUFFER, LOCAL_GL_STENCIL_ATTACHMENT, LOCAL_GL_TEXTURE_2D, nullptr, 0);
     if (mDepthStencilAttachment.Texture() == tex)
         FramebufferTexture2D(LOCAL_GL_FRAMEBUFFER, LOCAL_GL_DEPTH_STENCIL_ATTACHMENT, LOCAL_GL_TEXTURE_2D, nullptr, 0);
 }
 void
 WebGLFramebuffer::DetachRenderbuffer(const WebGLRenderbuffer* rb)
 {
     size_t count = mColorAttachments.Length();
     for (size_t i = 0; i < count; i++) {
         if (mColorAttachments[i].Renderbuffer() == rb) {
             FramebufferRenderbuffer(LOCAL_GL_FRAMEBUFFER, LOCAL_GL_COLOR_ATTACHMENT0+i, LOCAL_GL_RENDERBUFFER, nullptr);
             // a renderbuffer might be attached more that once while editing the framebuffer
         }
     }
     if (mDepthAttachment.Renderbuffer() == rb)
         FramebufferRenderbuffer(LOCAL_GL_FRAMEBUFFER, LOCAL_GL_DEPTH_ATTACHMENT, LOCAL_GL_RENDERBUFFER, nullptr);
     if (mStencilAttachment.Renderbuffer() == rb)
         FramebufferRenderbuffer(LOCAL_GL_FRAMEBUFFER, LOCAL_GL_STENCIL_ATTACHMENT, LOCAL_GL_RENDERBUFFER, nullptr);
     if (mDepthStencilAttachment.Renderbuffer() == rb)
         FramebufferRenderbuffer(LOCAL_GL_FRAMEBUFFER, LOCAL_GL_DEPTH_STENCIL_ATTACHMENT, LOCAL_GL_RENDERBUFFER, nullptr);
 }
 bool
 WebGLFramebuffer::HasDefinedAttachments() const
 {
     bool hasAttachments = false;
     size_t count = mColorAttachments.Length();
     for (size_t i = 0; i < count; i++) {
         hasAttachments |= mColorAttachments[i].IsDefined();
     }
     hasAttachments |= mDepthAttachment.IsDefined();
     hasAttachments |= mStencilAttachment.IsDefined();
     hasAttachments |= mDepthStencilAttachment.IsDefined();
     return hasAttachments;
 }
 static bool
 IsIncomplete(const WebGLFramebuffer::Attachment& cur)
 {
     return cur.IsDefined() && !cur.IsComplete();
 }
 bool
 WebGLFramebuffer::HasIncompleteAttachments() const
 {
     bool hasIncomplete = false;
     size_t count = mColorAttachments.Length();
     for (size_t i = 0; i < count; i++) {
         hasIncomplete |= IsIncomplete(mColorAttachments[i]);
     }
     hasIncomplete |= IsIncomplete(mDepthAttachment);
     hasIncomplete |= IsIncomplete(mStencilAttachment);
     hasIncomplete |= IsIncomplete(mDepthStencilAttachment);
     return hasIncomplete;
 }
 const WebGLRectangleObject&
 WebGLFramebuffer::GetAnyRectObject() const
 {
     MOZ_ASSERT(HasDefinedAttachments());
     size_t count = mColorAttachments.Length();
     for (size_t i = 0; i < count; i++) {
         if (mColorAttachments[i].HasImage())
             return mColorAttachments[i].RectangleObject();
     }
     if (mDepthAttachment.HasImage())
         return mDepthAttachment.RectangleObject();
     if (mStencilAttachment.HasImage())
         return mStencilAttachment.RectangleObject();
     if (mDepthStencilAttachment.HasImage())
         return mDepthStencilAttachment.RectangleObject();
     MOZ_CRASH("Should not get here.");
 }
 static bool
 RectsMatch(const WebGLFramebuffer::Attachment& attachment,
            const WebGLRectangleObject& rect)
 {
     return attachment.RectangleObject().HasSameDimensionsAs(rect);
 }
 bool
 WebGLFramebuffer::AllImageRectsMatch() const
 {
     MOZ_ASSERT(HasDefinedAttachments());
     MOZ_ASSERT(!HasIncompleteAttachments());
     const WebGLRectangleObject& rect = GetAnyRectObject();
     // Alright, we have *a* rect, let's check all the others.
     bool imageRectsMatch = true;
     size_t count = mColorAttachments.Length();
     for (size_t i = 0; i < count; i++) {
         if (mColorAttachments[i].HasImage())
             imageRectsMatch &= RectsMatch(mColorAttachments[i], rect);
     }
     if (mDepthAttachment.HasImage())
         imageRectsMatch &= RectsMatch(mDepthAttachment, rect);
     if (mStencilAttachment.HasImage())
         imageRectsMatch &= RectsMatch(mStencilAttachment, rect);
     if (mDepthStencilAttachment.HasImage())
         imageRectsMatch &= RectsMatch(mDepthStencilAttachment, rect);
     return imageRectsMatch;
 }
 const WebGLRectangleObject&
 WebGLFramebuffer::RectangleObject() const
 {
     // If we're using this as the RectObj of an FB, we need to be sure the FB
     // has a consistent rect.
     MOZ_ASSERT(AllImageRectsMatch(), "Did you mean `GetAnyRectObject`?");
     return GetAnyRectObject();
 }
 GLenum
 WebGLFramebuffer::PrecheckFramebufferStatus() const
 {
     MOZ_ASSERT(mContext->mBoundFramebuffer == this);
     if (!HasDefinedAttachments())
         return LOCAL_GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT; // No attachments
     if (HasIncompleteAttachments())
         return LOCAL_GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
     if (!AllImageRectsMatch())
         return LOCAL_GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS; // Inconsistent sizes
     if (HasDepthStencilConflict())
         return LOCAL_GL_FRAMEBUFFER_UNSUPPORTED;
     return LOCAL_GL_FRAMEBUFFER_COMPLETE;
 }
 GLenum
 WebGLFramebuffer::CheckFramebufferStatus() const
 {
     if (mStatus != 0)
         return mStatus;
     mStatus = PrecheckFramebufferStatus();
     if (mStatus != LOCAL_GL_FRAMEBUFFER_COMPLETE)
         return mStatus;
     // Looks good on our end. Let's ask the driver.
     mContext->MakeContextCurrent();
     // Ok, attach our chosen flavor of {DEPTH, STENCIL, DEPTH_STENCIL}.
     FinalizeAttachments();
     mStatus = mContext->gl->fCheckFramebufferStatus(LOCAL_GL_FRAMEBUFFER);
     return mStatus;
 }
 bool
 WebGLFramebuffer::HasCompletePlanes(GLbitfield mask)
 {
     if (CheckFramebufferStatus() != LOCAL_GL_FRAMEBUFFER_COMPLETE)
         return false;
     MOZ_ASSERT(mContext->mBoundFramebuffer == this);
     bool hasPlanes = true;
     if (mask & LOCAL_GL_COLOR_BUFFER_BIT) {
         hasPlanes &= ColorAttachmentCount() &&
                      ColorAttachment(0).IsDefined();
     }
     if (mask & LOCAL_GL_DEPTH_BUFFER_BIT) {
         hasPlanes &= DepthAttachment().IsDefined() ||
                      DepthStencilAttachment().IsDefined();
     }
     if (mask & LOCAL_GL_STENCIL_BUFFER_BIT) {
         hasPlanes &= StencilAttachment().IsDefined() ||
                      DepthStencilAttachment().IsDefined();
     }
     return hasPlanes;
 }
 bool
 WebGLFramebuffer::CheckAndInitializeAttachments()
 {
     MOZ_ASSERT(mContext->mBoundFramebuffer == this);
     if (CheckFramebufferStatus() != LOCAL_GL_FRAMEBUFFER_COMPLETE)
         return false;
     // Cool! We've checked out ok. Just need to initialize.
     size_t colorAttachmentCount = mColorAttachments.Length();
     // Check if we need to initialize anything
     {
         bool hasUninitializedAttachments = false;
         for (size_t i = 0; i < colorAttachmentCount; i++) {
             if (mColorAttachments[i].HasImage())
                 hasUninitializedAttachments |= mColorAttachments[i].HasUninitializedImageData();
         }
         if (mDepthAttachment.HasImage())
             hasUninitializedAttachments |= mDepthAttachment.HasUninitializedImageData();
         if (mStencilAttachment.HasImage())
             hasUninitializedAttachments |= mStencilAttachment.HasUninitializedImageData();
         if (mDepthStencilAttachment.HasImage())
             hasUninitializedAttachments |= mDepthStencilAttachment.HasUninitializedImageData();
         if (!hasUninitializedAttachments)
             return true;
     }
     // Get buffer-bit-mask and color-attachment-mask-list
     uint32_t mask = 0;
     bool colorAttachmentsMask[WebGLContext::sMaxColorAttachments] = { false };
     MOZ_ASSERT(colorAttachmentCount <= WebGLContext::sMaxColorAttachments);
     for (size_t i = 0; i < colorAttachmentCount; i++) {
         if (mColorAttachments[i].HasUninitializedImageData()) {
           colorAttachmentsMask[i] = true;
           mask |= LOCAL_GL_COLOR_BUFFER_BIT;
         }
     }
     if (mDepthAttachment.HasUninitializedImageData() ||
         mDepthStencilAttachment.HasUninitializedImageData())
     {
         mask |= LOCAL_GL_DEPTH_BUFFER_BIT;
     }
     if (mStencilAttachment.HasUninitializedImageData() ||
         mDepthStencilAttachment.HasUninitializedImageData())
     {
         mask |= LOCAL_GL_STENCIL_BUFFER_BIT;
     }
     // Clear!
     mContext->ForceClearFramebufferWithDefaultValues(mask, colorAttachmentsMask);
     // Mark all the uninitialized images as initialized.
     for (size_t i = 0; i < colorAttachmentCount; i++) {
         if (mColorAttachments[i].HasUninitializedImageData())
             mColorAttachments[i].SetImageDataStatus(WebGLImageDataStatus::InitializedImageData);
     }
     if (mDepthAttachment.HasUninitializedImageData())
         mDepthAttachment.SetImageDataStatus(WebGLImageDataStatus::InitializedImageData);
     if (mStencilAttachment.HasUninitializedImageData())
         mStencilAttachment.SetImageDataStatus(WebGLImageDataStatus::InitializedImageData);
     if (mDepthStencilAttachment.HasUninitializedImageData())
         mDepthStencilAttachment.SetImageDataStatus(WebGLImageDataStatus::InitializedImageData);
     return true;
 }
 bool WebGLFramebuffer::CheckColorAttachmentNumber(GLenum attachment, const char* functionName) const
 {
     const char* const errorFormating = "%s: attachment: invalid enum value 0x%x";
     if (mContext->IsExtensionEnabled(WebGLExtensionID::WEBGL_draw_buffers)) {
         if (attachment < LOCAL_GL_COLOR_ATTACHMENT0 ||
             attachment >= GLenum(LOCAL_GL_COLOR_ATTACHMENT0 + mContext->mGLMaxColorAttachments))
         {
             mContext->ErrorInvalidEnum(errorFormating, functionName, attachment);
             return false;
         }
     } else if (attachment != LOCAL_GL_COLOR_ATTACHMENT0) {
         if (attachment > LOCAL_GL_COLOR_ATTACHMENT0 &&
             attachment <= LOCAL_GL_COLOR_ATTACHMENT15)
         {
             mContext->ErrorInvalidEnum("%s: attachment: invalid enum value 0x%x. "
                                        "Try the WEBGL_draw_buffers extension if supported.", functionName, attachment);
             return false;
         } else {
             mContext->ErrorInvalidEnum(errorFormating, functionName, attachment);
             return false;
         }
     }
     return true;
 }
 void WebGLFramebuffer::EnsureColorAttachments(size_t colorAttachmentId)
 {
     MOZ_ASSERT(colorAttachmentId < WebGLContext::sMaxColorAttachments);
     size_t currentAttachmentCount = mColorAttachments.Length();
     if (colorAttachmentId < currentAttachmentCount)
         return;
     mColorAttachments.SetLength(colorAttachmentId + 1);
     for (size_t i = colorAttachmentId; i >= currentAttachmentCount; i--) {
         mColorAttachments[i].mAttachmentPoint = LOCAL_GL_COLOR_ATTACHMENT0 + i;
     }
 }
 void
 WebGLFramebuffer::NotifyAttachableChanged() const
 {
     // Attachment has changed, so invalidate cached status
     mStatus = 0;
 }
 static void
 FinalizeDrawAndReadBuffers(GLContext* aGL, bool aColorBufferDefined)
 {
     MOZ_ASSERT(aGL, "Expected a valid GLContext ptr.");
     // GLES don't support DrawBuffer()/ReadBuffer.
     // According to http://www.opengl.org/wiki/Framebuffer_Object
     //
     // Each draw buffers must either specify color attachment points that have images
     // attached or must be GL_NONE. (GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER when false).
     //
     // If the read buffer is set, then it must specify an attachment point that has an
     // image attached. (GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER when false).
     //
     // Note that this test is not performed if OpenGL 4.2 or ARB_ES2_compatibility is
     // available.
     if (aGL->IsGLES() ||
         aGL->IsSupported(GLFeature::ES2_compatibility) ||
         aGL->IsAtLeast(ContextProfile::OpenGL, 420))
     {
         return;
     }
     // TODO(djg): Assert that fDrawBuffer/fReadBuffer is not NULL.
     GLenum colorBufferSource = aColorBufferDefined ? LOCAL_GL_COLOR_ATTACHMENT0 : LOCAL_GL_NONE;
     aGL->fDrawBuffer(colorBufferSource);
     aGL->fReadBuffer(colorBufferSource);
 }
 void
 WebGLFramebuffer::FinalizeAttachments() const
 {
     GLContext* gl = mContext->gl;
     size_t count = ColorAttachmentCount();
     for (size_t i = 0; i < count; i++) {
         ColorAttachment(i).FinalizeAttachment(gl, LOCAL_GL_COLOR_ATTACHMENT0 + i);
     }
     DepthAttachment().FinalizeAttachment(gl, LOCAL_GL_DEPTH_ATTACHMENT);
     StencilAttachment().FinalizeAttachment(gl, LOCAL_GL_STENCIL_ATTACHMENT);
     DepthStencilAttachment().FinalizeAttachment(gl, LOCAL_GL_DEPTH_STENCIL_ATTACHMENT);
     FinalizeDrawAndReadBuffers(gl, ColorAttachment(0).IsDefined());
 }
 inline void
 ImplCycleCollectionUnlink(mozilla::WebGLFramebuffer::Attachment& aField)
 {
     aField.mTexturePtr = nullptr;
     aField.mRenderbufferPtr = nullptr;
 }
 inline void
 ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& aCallback,
                             mozilla::WebGLFramebuffer::Attachment& aField,
                             const char* aName,
                             uint32_t aFlags = 0)
 {
     CycleCollectionNoteChild(aCallback, aField.mTexturePtr.get(),
                              aName, aFlags);
     CycleCollectionNoteChild(aCallback, aField.mRenderbufferPtr.get(),
                              aName, aFlags);
 }
 NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_4(WebGLFramebuffer,
   mColorAttachments,
   mDepthAttachment,
   mStencilAttachment,
   mDepthStencilAttachment)
 NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(WebGLFramebuffer, AddRef)
 NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(WebGLFramebuffer, Release)

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

content/canvas/src/WebGLFramebuffer.cpp