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-rwxr-xr-xgfx/gl/GLScreenBuffer.cpp1044
1 files changed, 1044 insertions, 0 deletions
diff --git a/gfx/gl/GLScreenBuffer.cpp b/gfx/gl/GLScreenBuffer.cpp
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--- /dev/null
+++ b/gfx/gl/GLScreenBuffer.cpp
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+/* -*- Mode: c++; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40; -*- */
+/* 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 "GLScreenBuffer.h"
+
+#include <cstring>
+#include "CompositorTypes.h"
+#include "GLContext.h"
+#include "GLBlitHelper.h"
+#include "GLReadTexImageHelper.h"
+#include "SharedSurfaceEGL.h"
+#include "SharedSurfaceGL.h"
+#include "ScopedGLHelpers.h"
+#include "gfx2DGlue.h"
+#include "../layers/ipc/ShadowLayers.h"
+#include "mozilla/layers/TextureForwarder.h"
+#include "mozilla/layers/TextureClientSharedSurface.h"
+
+#ifdef XP_WIN
+#include "SharedSurfaceANGLE.h" // for SurfaceFactory_ANGLEShareHandle
+#include "SharedSurfaceD3D11Interop.h" // for SurfaceFactory_D3D11Interop
+#include "mozilla/gfx/DeviceManagerDx.h"
+#endif
+
+#ifdef XP_MACOSX
+#include "SharedSurfaceIO.h"
+#endif
+
+#ifdef GL_PROVIDER_GLX
+#include "GLXLibrary.h"
+#include "SharedSurfaceGLX.h"
+#endif
+
+namespace mozilla {
+namespace gl {
+
+using gfx::SurfaceFormat;
+
+UniquePtr<GLScreenBuffer>
+GLScreenBuffer::Create(GLContext* gl,
+ const gfx::IntSize& size,
+ const SurfaceCaps& caps)
+{
+ UniquePtr<GLScreenBuffer> ret;
+ if (caps.antialias &&
+ !gl->IsSupported(GLFeature::framebuffer_multisample))
+ {
+ return Move(ret);
+ }
+
+ layers::TextureFlags flags = layers::TextureFlags::ORIGIN_BOTTOM_LEFT;
+ if (!caps.premultAlpha) {
+ flags |= layers::TextureFlags::NON_PREMULTIPLIED;
+ }
+
+ UniquePtr<SurfaceFactory> factory = MakeUnique<SurfaceFactory_Basic>(gl, caps, flags);
+
+ ret.reset( new GLScreenBuffer(gl, caps, Move(factory)) );
+ return Move(ret);
+}
+
+/* static */ UniquePtr<SurfaceFactory>
+GLScreenBuffer::CreateFactory(GLContext* gl,
+ const SurfaceCaps& caps,
+ KnowsCompositor* compositorConnection,
+ const layers::TextureFlags& flags)
+{
+ return CreateFactory(gl, caps, compositorConnection->GetTextureForwarder(),
+ compositorConnection->GetCompositorBackendType(), flags);
+}
+
+/* static */ UniquePtr<SurfaceFactory>
+GLScreenBuffer::CreateFactory(GLContext* gl,
+ const SurfaceCaps& caps,
+ LayersIPCChannel* ipcChannel,
+ const mozilla::layers::LayersBackend backend,
+ const layers::TextureFlags& flags)
+{
+ UniquePtr<SurfaceFactory> factory = nullptr;
+ if (!gfxPrefs::WebGLForceLayersReadback()) {
+ switch (backend) {
+ case mozilla::layers::LayersBackend::LAYERS_OPENGL: {
+#if defined(XP_MACOSX)
+ factory = SurfaceFactory_IOSurface::Create(gl, caps, ipcChannel, flags);
+#elif defined(GL_PROVIDER_GLX)
+ if (sGLXLibrary.UseTextureFromPixmap())
+ factory = SurfaceFactory_GLXDrawable::Create(gl, caps, ipcChannel, flags);
+#elif defined(MOZ_WIDGET_UIKIT)
+ factory = MakeUnique<SurfaceFactory_GLTexture>(mGLContext, caps, ipcChannel, mFlags);
+#else
+ if (gl->GetContextType() == GLContextType::EGL) {
+ if (XRE_IsParentProcess()) {
+ factory = SurfaceFactory_EGLImage::Create(gl, caps, ipcChannel, flags);
+ }
+ }
+#endif
+ break;
+ }
+ case mozilla::layers::LayersBackend::LAYERS_D3D11: {
+#ifdef XP_WIN
+ // Enable surface sharing only if ANGLE and compositing devices
+ // are both WARP or both not WARP
+ gfx::DeviceManagerDx* dm = gfx::DeviceManagerDx::Get();
+ if (gl->IsANGLE() &&
+ (gl->IsWARP() == dm->IsWARP()) &&
+ dm->TextureSharingWorks())
+ {
+ factory = SurfaceFactory_ANGLEShareHandle::Create(gl, caps, ipcChannel, flags);
+ }
+
+ if (!factory && gfxPrefs::WebGLDXGLEnabled()) {
+ factory = SurfaceFactory_D3D11Interop::Create(gl, caps, ipcChannel, flags);
+ }
+#endif
+ break;
+ }
+ default:
+ break;
+ }
+
+#ifdef GL_PROVIDER_GLX
+ if (!factory && sGLXLibrary.UseTextureFromPixmap()) {
+ factory = SurfaceFactory_GLXDrawable::Create(gl, caps, ipcChannel, flags);
+ }
+#endif
+ }
+
+ return factory;
+}
+
+GLScreenBuffer::GLScreenBuffer(GLContext* gl,
+ const SurfaceCaps& caps,
+ UniquePtr<SurfaceFactory> factory)
+ : mGL(gl)
+ , mCaps(caps)
+ , mFactory(Move(factory))
+ , mNeedsBlit(true)
+ , mUserReadBufferMode(LOCAL_GL_BACK)
+ , mUserDrawBufferMode(LOCAL_GL_BACK)
+ , mUserDrawFB(0)
+ , mUserReadFB(0)
+ , mInternalDrawFB(0)
+ , mInternalReadFB(0)
+#ifdef DEBUG
+ , mInInternalMode_DrawFB(true)
+ , mInInternalMode_ReadFB(true)
+#endif
+{ }
+
+GLScreenBuffer::~GLScreenBuffer()
+{
+ mFactory = nullptr;
+ mDraw = nullptr;
+ mRead = nullptr;
+
+ if (!mBack)
+ return;
+
+ // Detach mBack cleanly.
+ mBack->Surf()->ProducerRelease();
+}
+
+void
+GLScreenBuffer::BindAsFramebuffer(GLContext* const gl, GLenum target) const
+{
+ GLuint drawFB = DrawFB();
+ GLuint readFB = ReadFB();
+
+ if (!gl->IsSupported(GLFeature::split_framebuffer)) {
+ MOZ_ASSERT(drawFB == readFB);
+ gl->raw_fBindFramebuffer(target, readFB);
+ return;
+ }
+
+ switch (target) {
+ case LOCAL_GL_FRAMEBUFFER:
+ gl->raw_fBindFramebuffer(LOCAL_GL_DRAW_FRAMEBUFFER_EXT, drawFB);
+ gl->raw_fBindFramebuffer(LOCAL_GL_READ_FRAMEBUFFER_EXT, readFB);
+ break;
+
+ case LOCAL_GL_DRAW_FRAMEBUFFER_EXT:
+ gl->raw_fBindFramebuffer(LOCAL_GL_DRAW_FRAMEBUFFER_EXT, drawFB);
+ break;
+
+ case LOCAL_GL_READ_FRAMEBUFFER_EXT:
+ gl->raw_fBindFramebuffer(LOCAL_GL_READ_FRAMEBUFFER_EXT, readFB);
+ break;
+
+ default:
+ MOZ_CRASH("GFX: Bad `target` for BindFramebuffer.");
+ }
+}
+
+void
+GLScreenBuffer::BindFB(GLuint fb)
+{
+ GLuint drawFB = DrawFB();
+ GLuint readFB = ReadFB();
+
+ mUserDrawFB = fb;
+ mUserReadFB = fb;
+ mInternalDrawFB = (fb == 0) ? drawFB : fb;
+ mInternalReadFB = (fb == 0) ? readFB : fb;
+
+ if (mInternalDrawFB == mInternalReadFB) {
+ mGL->raw_fBindFramebuffer(LOCAL_GL_FRAMEBUFFER, mInternalDrawFB);
+ } else {
+ MOZ_ASSERT(mGL->IsSupported(GLFeature::split_framebuffer));
+ mGL->raw_fBindFramebuffer(LOCAL_GL_DRAW_FRAMEBUFFER_EXT, mInternalDrawFB);
+ mGL->raw_fBindFramebuffer(LOCAL_GL_READ_FRAMEBUFFER_EXT, mInternalReadFB);
+ }
+
+#ifdef DEBUG
+ mInInternalMode_DrawFB = false;
+ mInInternalMode_ReadFB = false;
+#endif
+}
+
+void
+GLScreenBuffer::BindDrawFB(GLuint fb)
+{
+ MOZ_ASSERT(mGL->IsSupported(GLFeature::split_framebuffer));
+
+ GLuint drawFB = DrawFB();
+ mUserDrawFB = fb;
+ mInternalDrawFB = (fb == 0) ? drawFB : fb;
+
+ mGL->raw_fBindFramebuffer(LOCAL_GL_DRAW_FRAMEBUFFER_EXT, mInternalDrawFB);
+
+#ifdef DEBUG
+ mInInternalMode_DrawFB = false;
+#endif
+}
+
+void
+GLScreenBuffer::BindReadFB(GLuint fb)
+{
+ MOZ_ASSERT(mGL->IsSupported(GLFeature::split_framebuffer));
+
+ GLuint readFB = ReadFB();
+ mUserReadFB = fb;
+ mInternalReadFB = (fb == 0) ? readFB : fb;
+
+ mGL->raw_fBindFramebuffer(LOCAL_GL_READ_FRAMEBUFFER_EXT, mInternalReadFB);
+
+#ifdef DEBUG
+ mInInternalMode_ReadFB = false;
+#endif
+}
+
+void
+GLScreenBuffer::BindFB_Internal(GLuint fb)
+{
+ mInternalDrawFB = mUserDrawFB = fb;
+ mInternalReadFB = mUserReadFB = fb;
+ mGL->raw_fBindFramebuffer(LOCAL_GL_FRAMEBUFFER, mInternalDrawFB);
+
+#ifdef DEBUG
+ mInInternalMode_DrawFB = true;
+ mInInternalMode_ReadFB = true;
+#endif
+}
+
+void
+GLScreenBuffer::BindDrawFB_Internal(GLuint fb)
+{
+ MOZ_ASSERT(mGL->IsSupported(GLFeature::split_framebuffer));
+
+ mInternalDrawFB = mUserDrawFB = fb;
+ mGL->raw_fBindFramebuffer(LOCAL_GL_DRAW_FRAMEBUFFER_EXT, mInternalDrawFB);
+
+#ifdef DEBUG
+ mInInternalMode_DrawFB = true;
+#endif
+}
+
+void
+GLScreenBuffer::BindReadFB_Internal(GLuint fb)
+{
+ MOZ_ASSERT(mGL->IsSupported(GLFeature::split_framebuffer));
+
+ mInternalReadFB = mUserReadFB = fb;
+ mGL->raw_fBindFramebuffer(LOCAL_GL_READ_FRAMEBUFFER_EXT, mInternalReadFB);
+
+#ifdef DEBUG
+ mInInternalMode_ReadFB = true;
+#endif
+}
+
+
+GLuint
+GLScreenBuffer::GetDrawFB() const
+{
+#ifdef DEBUG
+ MOZ_ASSERT(mGL->IsCurrent());
+ MOZ_ASSERT(!mInInternalMode_DrawFB);
+
+ // Don't need a branch here, because:
+ // LOCAL_GL_DRAW_FRAMEBUFFER_BINDING_EXT == LOCAL_GL_FRAMEBUFFER_BINDING == 0x8CA6
+ // We use raw_ here because this is debug code and we need to see what
+ // the driver thinks.
+ GLuint actual = 0;
+ mGL->raw_fGetIntegerv(LOCAL_GL_DRAW_FRAMEBUFFER_BINDING_EXT, (GLint*)&actual);
+
+ GLuint predicted = mInternalDrawFB;
+ if (predicted != actual) {
+ printf_stderr("Misprediction: Bound draw FB predicted: %d. Was: %d.\n",
+ predicted, actual);
+ MOZ_ASSERT(false, "Draw FB binding misprediction!");
+ }
+#endif
+
+ return mUserDrawFB;
+}
+
+GLuint
+GLScreenBuffer::GetReadFB() const
+{
+#ifdef DEBUG
+ MOZ_ASSERT(mGL->IsCurrent());
+ MOZ_ASSERT(!mInInternalMode_ReadFB);
+
+ // We use raw_ here because this is debug code and we need to see what
+ // the driver thinks.
+ GLuint actual = 0;
+ if (mGL->IsSupported(GLFeature::split_framebuffer))
+ mGL->raw_fGetIntegerv(LOCAL_GL_READ_FRAMEBUFFER_BINDING_EXT, (GLint*)&actual);
+ else
+ mGL->raw_fGetIntegerv(LOCAL_GL_FRAMEBUFFER_BINDING, (GLint*)&actual);
+
+ GLuint predicted = mInternalReadFB;
+ if (predicted != actual) {
+ printf_stderr("Misprediction: Bound read FB predicted: %d. Was: %d.\n",
+ predicted, actual);
+ MOZ_ASSERT(false, "Read FB binding misprediction!");
+ }
+#endif
+
+ return mUserReadFB;
+}
+
+GLuint
+GLScreenBuffer::GetFB() const
+{
+ MOZ_ASSERT(GetDrawFB() == GetReadFB());
+ return GetDrawFB();
+}
+
+
+void
+GLScreenBuffer::DeletingFB(GLuint fb)
+{
+ if (fb == mInternalDrawFB) {
+ mInternalDrawFB = 0;
+ mUserDrawFB = 0;
+ }
+ if (fb == mInternalReadFB) {
+ mInternalReadFB = 0;
+ mUserReadFB = 0;
+ }
+}
+
+
+void
+GLScreenBuffer::AfterDrawCall()
+{
+ if (mUserDrawFB != 0)
+ return;
+
+ RequireBlit();
+}
+
+void
+GLScreenBuffer::BeforeReadCall()
+{
+ if (mUserReadFB != 0)
+ return;
+
+ AssureBlitted();
+}
+
+bool
+GLScreenBuffer::CopyTexImage2D(GLenum target, GLint level, GLenum internalformat, GLint x,
+ GLint y, GLsizei width, GLsizei height, GLint border)
+{
+ SharedSurface* surf;
+ if (GetReadFB() == 0) {
+ surf = SharedSurf();
+ } else {
+ surf = mGL->mFBOMapping[GetReadFB()];
+ }
+ if (surf) {
+ return surf->CopyTexImage2D(target, level, internalformat, x, y, width, height, border);
+ }
+
+ return false;
+}
+
+bool
+GLScreenBuffer::ReadPixels(GLint x, GLint y,
+ GLsizei width, GLsizei height,
+ GLenum format, GLenum type,
+ GLvoid* pixels)
+{
+ // If the currently bound framebuffer is backed by a SharedSurface
+ // then it might want to override how we read pixel data from it.
+ // This is normally only the default framebuffer, but we can also
+ // have SharedSurfaces bound to other framebuffers when doing
+ // readback for BasicLayers.
+ SharedSurface* surf;
+ if (GetReadFB() == 0) {
+ surf = SharedSurf();
+ } else {
+ surf = mGL->mFBOMapping[GetReadFB()];
+ }
+ if (surf) {
+ return surf->ReadPixels(x, y, width, height, format, type, pixels);
+ }
+
+ return false;
+}
+
+void
+GLScreenBuffer::RequireBlit()
+{
+ mNeedsBlit = true;
+}
+
+void
+GLScreenBuffer::AssureBlitted()
+{
+ if (!mNeedsBlit)
+ return;
+
+ if (mDraw) {
+ GLuint drawFB = DrawFB();
+ GLuint readFB = ReadFB();
+
+ MOZ_ASSERT(drawFB != 0);
+ MOZ_ASSERT(drawFB != readFB);
+ MOZ_ASSERT(mGL->IsSupported(GLFeature::split_framebuffer));
+ MOZ_ASSERT(mDraw->mSize == mRead->Size());
+
+ ScopedBindFramebuffer boundFB(mGL);
+ ScopedGLState scissor(mGL, LOCAL_GL_SCISSOR_TEST, false);
+
+ BindReadFB_Internal(drawFB);
+ BindDrawFB_Internal(readFB);
+
+ if (mGL->IsSupported(GLFeature::framebuffer_blit)) {
+ const gfx::IntSize& srcSize = mDraw->mSize;
+ const gfx::IntSize& destSize = mRead->Size();
+
+ mGL->raw_fBlitFramebuffer(0, 0, srcSize.width, srcSize.height,
+ 0, 0, destSize.width, destSize.height,
+ LOCAL_GL_COLOR_BUFFER_BIT,
+ LOCAL_GL_NEAREST);
+ } else if (mGL->IsExtensionSupported(GLContext::APPLE_framebuffer_multisample)) {
+ mGL->fResolveMultisampleFramebufferAPPLE();
+ } else {
+ MOZ_CRASH("GFX: No available blit methods.");
+ }
+ // Done!
+ }
+
+ mNeedsBlit = false;
+}
+
+void
+GLScreenBuffer::Morph(UniquePtr<SurfaceFactory> newFactory)
+{
+ MOZ_RELEASE_ASSERT(newFactory, "newFactory must not be null");
+ mFactory = Move(newFactory);
+}
+
+bool
+GLScreenBuffer::Attach(SharedSurface* surf, const gfx::IntSize& size)
+{
+ ScopedBindFramebuffer autoFB(mGL);
+
+ const bool readNeedsUnlock = (mRead && SharedSurf());
+ if (readNeedsUnlock) {
+ SharedSurf()->UnlockProd();
+ }
+
+ surf->LockProd();
+
+ if (mRead &&
+ surf->mAttachType == SharedSurf()->mAttachType &&
+ size == Size())
+ {
+ // Same size, same type, ready for reuse!
+ mRead->Attach(surf);
+ } else {
+ // Else something changed, so resize:
+ UniquePtr<DrawBuffer> draw;
+ bool drawOk = true;
+
+ /* Don't change out the draw buffer unless we resize. In the
+ * preserveDrawingBuffer:true case, prior contents of the buffer must
+ * be retained. If we're using a draw buffer, it's an MSAA buffer, so
+ * even if we copy the previous frame into the (single-sampled) read
+ * buffer, if we need to re-resolve from draw to read (as triggered by
+ * drawing), we'll need the old MSAA content to still be in the draw
+ * buffer.
+ */
+ if (!mDraw || size != Size())
+ drawOk = CreateDraw(size, &draw); // Can be null.
+
+ UniquePtr<ReadBuffer> read = CreateRead(surf);
+ bool readOk = !!read;
+
+ if (!drawOk || !readOk) {
+ surf->UnlockProd();
+ if (readNeedsUnlock) {
+ SharedSurf()->LockProd();
+ }
+ return false;
+ }
+
+ if (draw)
+ mDraw = Move(draw);
+
+ mRead = Move(read);
+ }
+
+ // Check that we're all set up.
+ MOZ_ASSERT(SharedSurf() == surf);
+
+ // Update the ReadBuffer mode.
+ if (mGL->IsSupported(gl::GLFeature::read_buffer)) {
+ BindFB(0);
+ mRead->SetReadBuffer(mUserReadBufferMode);
+ }
+
+ // Update the DrawBuffer mode.
+ if (mGL->IsSupported(gl::GLFeature::draw_buffers)) {
+ BindFB(0);
+ SetDrawBuffer(mUserDrawBufferMode);
+ }
+
+ RequireBlit();
+
+ return true;
+}
+
+bool
+GLScreenBuffer::Swap(const gfx::IntSize& size)
+{
+ RefPtr<SharedSurfaceTextureClient> newBack = mFactory->NewTexClient(size);
+ if (!newBack)
+ return false;
+
+ // In the case of DXGL interop, the new surface needs to be acquired before
+ // it is attached so that the interop surface is locked, which populates
+ // the GL renderbuffer. This results in the renderbuffer being ready and
+ // attachment to framebuffer succeeds in Attach() call.
+ newBack->Surf()->ProducerAcquire();
+
+ if (!Attach(newBack->Surf(), size)) {
+ newBack->Surf()->ProducerRelease();
+ return false;
+ }
+ // Attach was successful.
+
+ mFront = mBack;
+ mBack = newBack;
+
+ if (ShouldPreserveBuffer() &&
+ mFront &&
+ mBack &&
+ !mDraw)
+ {
+ auto src = mFront->Surf();
+ auto dest = mBack->Surf();
+
+ //uint32_t srcPixel = ReadPixel(src);
+ //uint32_t destPixel = ReadPixel(dest);
+ //printf_stderr("Before: src: 0x%08x, dest: 0x%08x\n", srcPixel, destPixel);
+#ifdef DEBUG
+ GLContext::LocalErrorScope errorScope(*mGL);
+#endif
+
+ SharedSurface::ProdCopy(src, dest, mFactory.get());
+
+#ifdef DEBUG
+ MOZ_ASSERT(!errorScope.GetError());
+#endif
+
+ //srcPixel = ReadPixel(src);
+ //destPixel = ReadPixel(dest);
+ //printf_stderr("After: src: 0x%08x, dest: 0x%08x\n", srcPixel, destPixel);
+ }
+
+ // XXX: We would prefer to fence earlier on platforms that don't need
+ // the full ProducerAcquire/ProducerRelease semantics, so that the fence
+ // doesn't include the copy operation. Unfortunately, the current API
+ // doesn't expose a good way to do that.
+ if (mFront) {
+ mFront->Surf()->ProducerRelease();
+ }
+
+ return true;
+}
+
+bool
+GLScreenBuffer::PublishFrame(const gfx::IntSize& size)
+{
+ AssureBlitted();
+
+ bool good = Swap(size);
+ return good;
+}
+
+bool
+GLScreenBuffer::Resize(const gfx::IntSize& size)
+{
+ RefPtr<SharedSurfaceTextureClient> newBack = mFactory->NewTexClient(size);
+ if (!newBack)
+ return false;
+
+ if (!Attach(newBack->Surf(), size))
+ return false;
+
+ if (mBack)
+ mBack->Surf()->ProducerRelease();
+
+ mBack = newBack;
+
+ mBack->Surf()->ProducerAcquire();
+
+ return true;
+}
+
+bool
+GLScreenBuffer::CreateDraw(const gfx::IntSize& size,
+ UniquePtr<DrawBuffer>* out_buffer)
+{
+ GLContext* gl = mFactory->mGL;
+ const GLFormats& formats = mFactory->mFormats;
+ const SurfaceCaps& caps = mFactory->DrawCaps();
+
+ return DrawBuffer::Create(gl, caps, formats, size, out_buffer);
+}
+
+UniquePtr<ReadBuffer>
+GLScreenBuffer::CreateRead(SharedSurface* surf)
+{
+ GLContext* gl = mFactory->mGL;
+ const GLFormats& formats = mFactory->mFormats;
+ const SurfaceCaps& caps = mFactory->ReadCaps();
+
+ return ReadBuffer::Create(gl, caps, formats, surf);
+}
+
+void
+GLScreenBuffer::SetDrawBuffer(GLenum mode)
+{
+ MOZ_ASSERT(mGL->IsSupported(gl::GLFeature::draw_buffers));
+ MOZ_ASSERT(GetDrawFB() == 0);
+
+ if (!mGL->IsSupported(GLFeature::draw_buffers))
+ return;
+
+ mUserDrawBufferMode = mode;
+
+ GLuint fb = mDraw ? mDraw->mFB : mRead->mFB;
+ GLenum internalMode;
+
+ switch (mode) {
+ case LOCAL_GL_BACK:
+ internalMode = (fb == 0) ? LOCAL_GL_BACK
+ : LOCAL_GL_COLOR_ATTACHMENT0;
+ break;
+
+ case LOCAL_GL_NONE:
+ internalMode = LOCAL_GL_NONE;
+ break;
+
+ default:
+ MOZ_CRASH("GFX: Bad value.");
+ }
+
+ mGL->MakeCurrent();
+ mGL->fDrawBuffers(1, &internalMode);
+}
+
+void
+GLScreenBuffer::SetReadBuffer(GLenum mode)
+{
+ MOZ_ASSERT(mGL->IsSupported(gl::GLFeature::read_buffer));
+ MOZ_ASSERT(GetReadFB() == 0);
+
+ mUserReadBufferMode = mode;
+ mRead->SetReadBuffer(mUserReadBufferMode);
+}
+
+bool
+GLScreenBuffer::IsDrawFramebufferDefault() const
+{
+ if (!mDraw)
+ return IsReadFramebufferDefault();
+ return mDraw->mFB == 0;
+}
+
+bool
+GLScreenBuffer::IsReadFramebufferDefault() const
+{
+ return SharedSurf()->mAttachType == AttachmentType::Screen;
+}
+
+uint32_t
+GLScreenBuffer::DepthBits() const
+{
+ const GLFormats& formats = mFactory->mFormats;
+
+ if (formats.depth == LOCAL_GL_DEPTH_COMPONENT16)
+ return 16;
+
+ return 24;
+}
+
+////////////////////////////////////////////////////////////////////////
+// Utils
+
+static void
+RenderbufferStorageBySamples(GLContext* aGL, GLsizei aSamples,
+ GLenum aInternalFormat, const gfx::IntSize& aSize)
+{
+ if (aSamples) {
+ aGL->fRenderbufferStorageMultisample(LOCAL_GL_RENDERBUFFER,
+ aSamples,
+ aInternalFormat,
+ aSize.width, aSize.height);
+ } else {
+ aGL->fRenderbufferStorage(LOCAL_GL_RENDERBUFFER,
+ aInternalFormat,
+ aSize.width, aSize.height);
+ }
+}
+
+static GLuint
+CreateRenderbuffer(GLContext* aGL, GLenum aFormat, GLsizei aSamples,
+ const gfx::IntSize& aSize)
+{
+ GLuint rb = 0;
+ aGL->fGenRenderbuffers(1, &rb);
+ ScopedBindRenderbuffer autoRB(aGL, rb);
+
+ RenderbufferStorageBySamples(aGL, aSamples, aFormat, aSize);
+
+ return rb;
+}
+
+static void
+CreateRenderbuffersForOffscreen(GLContext* aGL, const GLFormats& aFormats,
+ const gfx::IntSize& aSize, bool aMultisample,
+ GLuint* aColorMSRB, GLuint* aDepthRB,
+ GLuint* aStencilRB)
+{
+ GLsizei samples = aMultisample ? aFormats.samples : 0;
+ if (aColorMSRB) {
+ MOZ_ASSERT(aFormats.samples > 0);
+ MOZ_ASSERT(aFormats.color_rbFormat);
+
+ GLenum colorFormat = aFormats.color_rbFormat;
+ if (aGL->IsANGLE()) {
+ MOZ_ASSERT(colorFormat == LOCAL_GL_RGBA8);
+ colorFormat = LOCAL_GL_BGRA8_EXT;
+ }
+
+ *aColorMSRB = CreateRenderbuffer(aGL, colorFormat, samples, aSize);
+ }
+
+ if (aDepthRB &&
+ aStencilRB &&
+ aFormats.depthStencil)
+ {
+ *aDepthRB = CreateRenderbuffer(aGL, aFormats.depthStencil, samples, aSize);
+ *aStencilRB = *aDepthRB;
+ } else {
+ if (aDepthRB) {
+ MOZ_ASSERT(aFormats.depth);
+
+ *aDepthRB = CreateRenderbuffer(aGL, aFormats.depth, samples, aSize);
+ }
+
+ if (aStencilRB) {
+ MOZ_ASSERT(aFormats.stencil);
+
+ *aStencilRB = CreateRenderbuffer(aGL, aFormats.stencil, samples, aSize);
+ }
+ }
+}
+
+////////////////////////////////////////////////////////////////////////
+// DrawBuffer
+
+bool
+DrawBuffer::Create(GLContext* const gl,
+ const SurfaceCaps& caps,
+ const GLFormats& formats,
+ const gfx::IntSize& size,
+ UniquePtr<DrawBuffer>* out_buffer)
+{
+ MOZ_ASSERT(out_buffer);
+ *out_buffer = nullptr;
+
+ if (!caps.color) {
+ MOZ_ASSERT(!caps.alpha && !caps.depth && !caps.stencil);
+
+ // Nothing is needed.
+ return true;
+ }
+
+ if (caps.antialias) {
+ if (formats.samples == 0)
+ return false; // Can't create it.
+
+ MOZ_ASSERT(formats.samples <= gl->MaxSamples());
+ }
+
+ GLuint colorMSRB = 0;
+ GLuint depthRB = 0;
+ GLuint stencilRB = 0;
+
+ GLuint* pColorMSRB = caps.antialias ? &colorMSRB : nullptr;
+ GLuint* pDepthRB = caps.depth ? &depthRB : nullptr;
+ GLuint* pStencilRB = caps.stencil ? &stencilRB : nullptr;
+
+ if (!formats.color_rbFormat)
+ pColorMSRB = nullptr;
+
+ if (pDepthRB && pStencilRB) {
+ if (!formats.depth && !formats.depthStencil)
+ pDepthRB = nullptr;
+
+ if (!formats.stencil && !formats.depthStencil)
+ pStencilRB = nullptr;
+ } else {
+ if (!formats.depth)
+ pDepthRB = nullptr;
+
+ if (!formats.stencil)
+ pStencilRB = nullptr;
+ }
+
+ GLContext::LocalErrorScope localError(*gl);
+
+ CreateRenderbuffersForOffscreen(gl, formats, size, caps.antialias,
+ pColorMSRB, pDepthRB, pStencilRB);
+
+ GLuint fb = 0;
+ gl->fGenFramebuffers(1, &fb);
+ gl->AttachBuffersToFB(0, colorMSRB, depthRB, stencilRB, fb);
+
+ const GLsizei samples = formats.samples;
+ UniquePtr<DrawBuffer> ret( new DrawBuffer(gl, size, samples, fb, colorMSRB,
+ depthRB, stencilRB) );
+
+ GLenum err = localError.GetError();
+ MOZ_ASSERT_IF(err != LOCAL_GL_NO_ERROR, err == LOCAL_GL_OUT_OF_MEMORY);
+ if (err || !gl->IsFramebufferComplete(fb))
+ return false;
+
+ *out_buffer = Move(ret);
+ return true;
+}
+
+DrawBuffer::~DrawBuffer()
+{
+ if (!mGL->MakeCurrent())
+ return;
+
+ GLuint fb = mFB;
+ GLuint rbs[] = {
+ mColorMSRB,
+ mDepthRB,
+ mStencilRB
+ };
+
+ mGL->fDeleteFramebuffers(1, &fb);
+ mGL->fDeleteRenderbuffers(3, rbs);
+}
+
+////////////////////////////////////////////////////////////////////////
+// ReadBuffer
+
+UniquePtr<ReadBuffer>
+ReadBuffer::Create(GLContext* gl,
+ const SurfaceCaps& caps,
+ const GLFormats& formats,
+ SharedSurface* surf)
+{
+ MOZ_ASSERT(surf);
+
+ if (surf->mAttachType == AttachmentType::Screen) {
+ // Don't need anything. Our read buffer will be the 'screen'.
+ return UniquePtr<ReadBuffer>( new ReadBuffer(gl, 0, 0, 0,
+ surf) );
+ }
+
+ GLuint depthRB = 0;
+ GLuint stencilRB = 0;
+
+ GLuint* pDepthRB = caps.depth ? &depthRB : nullptr;
+ GLuint* pStencilRB = caps.stencil ? &stencilRB : nullptr;
+
+ GLContext::LocalErrorScope localError(*gl);
+
+ CreateRenderbuffersForOffscreen(gl, formats, surf->mSize, caps.antialias,
+ nullptr, pDepthRB, pStencilRB);
+
+ GLuint colorTex = 0;
+ GLuint colorRB = 0;
+ GLenum target = 0;
+
+ switch (surf->mAttachType) {
+ case AttachmentType::GLTexture:
+ colorTex = surf->ProdTexture();
+ target = surf->ProdTextureTarget();
+ break;
+ case AttachmentType::GLRenderbuffer:
+ colorRB = surf->ProdRenderbuffer();
+ break;
+ default:
+ MOZ_CRASH("GFX: Unknown attachment type, create?");
+ }
+ MOZ_ASSERT(colorTex || colorRB);
+
+ GLuint fb = 0;
+ gl->fGenFramebuffers(1, &fb);
+ gl->AttachBuffersToFB(colorTex, colorRB, depthRB, stencilRB, fb, target);
+ gl->mFBOMapping[fb] = surf;
+
+ UniquePtr<ReadBuffer> ret( new ReadBuffer(gl, fb, depthRB,
+ stencilRB, surf) );
+
+ GLenum err = localError.GetError();
+ MOZ_ASSERT_IF(err != LOCAL_GL_NO_ERROR, err == LOCAL_GL_OUT_OF_MEMORY);
+ if (err)
+ return nullptr;
+
+ const bool needsAcquire = !surf->IsProducerAcquired();
+ if (needsAcquire) {
+ surf->ProducerReadAcquire();
+ }
+ const bool isComplete = gl->IsFramebufferComplete(fb);
+ if (needsAcquire) {
+ surf->ProducerReadRelease();
+ }
+
+ if (!isComplete)
+ return nullptr;
+
+ return Move(ret);
+}
+
+ReadBuffer::~ReadBuffer()
+{
+ if (!mGL->MakeCurrent())
+ return;
+
+ GLuint fb = mFB;
+ GLuint rbs[] = {
+ mDepthRB,
+ mStencilRB
+ };
+
+ mGL->fDeleteFramebuffers(1, &fb);
+ mGL->fDeleteRenderbuffers(2, rbs);
+ mGL->mFBOMapping.erase(mFB);
+}
+
+void
+ReadBuffer::Attach(SharedSurface* surf)
+{
+ MOZ_ASSERT(surf && mSurf);
+ MOZ_ASSERT(surf->mAttachType == mSurf->mAttachType);
+ MOZ_ASSERT(surf->mSize == mSurf->mSize);
+
+ // Nothing else is needed for AttachType Screen.
+ if (surf->mAttachType != AttachmentType::Screen) {
+ GLuint colorTex = 0;
+ GLuint colorRB = 0;
+ GLenum target = 0;
+
+ switch (surf->mAttachType) {
+ case AttachmentType::GLTexture:
+ colorTex = surf->ProdTexture();
+ target = surf->ProdTextureTarget();
+ break;
+ case AttachmentType::GLRenderbuffer:
+ colorRB = surf->ProdRenderbuffer();
+ break;
+ default:
+ MOZ_CRASH("GFX: Unknown attachment type, attach?");
+ }
+
+ mGL->AttachBuffersToFB(colorTex, colorRB, 0, 0, mFB, target);
+ mGL->mFBOMapping[mFB] = surf;
+ MOZ_ASSERT(mGL->IsFramebufferComplete(mFB));
+ }
+
+ mSurf = surf;
+}
+
+const gfx::IntSize&
+ReadBuffer::Size() const
+{
+ return mSurf->mSize;
+}
+
+void
+ReadBuffer::SetReadBuffer(GLenum userMode) const
+{
+ if (!mGL->IsSupported(GLFeature::read_buffer))
+ return;
+
+ GLenum internalMode;
+
+ switch (userMode) {
+ case LOCAL_GL_BACK:
+ case LOCAL_GL_FRONT:
+ internalMode = (mFB == 0) ? userMode
+ : LOCAL_GL_COLOR_ATTACHMENT0;
+ break;
+
+ case LOCAL_GL_NONE:
+ internalMode = LOCAL_GL_NONE;
+ break;
+
+ default:
+ MOZ_CRASH("GFX: Bad value.");
+ }
+
+ mGL->MakeCurrent();
+ mGL->fReadBuffer(internalMode);
+}
+
+} /* namespace gl */
+} /* namespace mozilla */