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gecko-dev/gfx/gl/GLScreenBuffer.cpp

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/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 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 "GLScreenBuffer.h"
#include <cstring>
#include "CompositorTypes.h"
#include "gfxPrefs.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 MOZ_X11
# 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 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, std::move(factory)));
return ret;
}
/* static */ UniquePtr<SurfaceFactory> GLScreenBuffer::CreateFactory(
GLContext* gl, const SurfaceCaps& caps,
KnowsCompositor* compositorConnection, const layers::TextureFlags& flags) {
LayersIPCChannel* ipcChannel = compositorConnection->GetTextureForwarder();
const layers::LayersBackend backend =
compositorConnection->GetCompositorBackendType();
const bool useANGLE = compositorConnection->GetCompositorUseANGLE();
const bool useGl =
!gfxPrefs::WebGLForceLayersReadback() &&
(backend == layers::LayersBackend::LAYERS_OPENGL ||
(backend == layers::LayersBackend::LAYERS_WR && !useANGLE));
const bool useD3D =
!gfxPrefs::WebGLForceLayersReadback() &&
(backend == layers::LayersBackend::LAYERS_D3D11 ||
(backend == layers::LayersBackend::LAYERS_WR && useANGLE));
UniquePtr<SurfaceFactory> factory = nullptr;
if (useGl) {
#if defined(XP_MACOSX)
factory = SurfaceFactory_IOSurface::Create(gl, caps, ipcChannel, flags);
#elif defined(MOZ_X11)
if (sGLXLibrary.UseTextureFromPixmap())
factory = SurfaceFactory_GLXDrawable::Create(gl, caps, ipcChannel, flags);
#elif defined(MOZ_WIDGET_UIKIT)
factory = MakeUnique<SurfaceFactory_GLTexture>(mGLContext, caps, ipcChannel,
mFlags);
#elif defined(MOZ_WIDGET_ANDROID)
if (XRE_IsParentProcess() && !gfxPrefs::WebGLSurfaceTextureEnabled()) {
factory = SurfaceFactory_EGLImage::Create(gl, caps, ipcChannel, flags);
} else {
factory =
SurfaceFactory_SurfaceTexture::Create(gl, caps, ipcChannel, flags);
}
#else
if (gl->GetContextType() == GLContextType::EGL) {
if (XRE_IsParentProcess()) {
factory = SurfaceFactory_EGLImage::Create(gl, caps, ipcChannel, flags);
}
}
#endif
} else if (useD3D) {
#ifdef XP_WIN
// Ensure devices initialization. SharedSurfaceANGLE and
// SharedSurfaceD3D11Interop use them. The devices are lazily initialized
// with WebRender to reduce memory usage.
gfxPlatform::GetPlatform()->EnsureDevicesInitialized();
// 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
}
#ifdef MOZ_X11
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(std::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(!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 && !mGL->CheckContextLost()) {
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(!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 && !mGL->CheckContextLost()) {
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 = std::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 = std::move(draw);
mRead = std::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(uint32_t(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 = std::move(ret);
return true;
}
DrawBuffer::~DrawBuffer() {
if (!mGL->MakeCurrent()) return;
GLuint fb = mFB;
GLuint rbs[] = {
mColorMSRB, mDepthRB,
(mStencilRB != mDepthRB) ? mStencilRB
: 0, // Don't double-delete DEPTH_STENCIL RBs.
};
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 ret;
}
ReadBuffer::~ReadBuffer() {
if (!mGL->MakeCurrent()) return;
GLuint fb = mFB;
GLuint rbs[] = {
mDepthRB,
(mStencilRB != mDepthRB) ? mStencilRB
: 0, // Don't double-delete DEPTH_STENCIL RBs.
};
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_GL_ASSERT(mGL, 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 */
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