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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 */
#include "GLContextTypes.h" // for GLContext
#include "GLDefs.h" // for GLenum, LOCAL_GL_FRAMEBUFFER, etc
#include "mozilla/Assertions.h" // for MOZ_ASSERT, etc
#include "mozilla/Attributes.h" // for override
#include "mozilla/RefPtr.h" // for RefPtr, already_AddRefed
#include "mozilla/gfx/Point.h" // for IntSize, IntSizeTyped
#include "mozilla/gfx/Types.h" // for SurfaceFormat, etc
#include "mozilla/layers/Compositor.h" // for SurfaceInitMode, etc
#include "mozilla/layers/TextureHost.h" // for CompositingRenderTarget
#include "mozilla/layers/CompositorOGL.h" // for CompositorOGL
#include "mozilla/mozalloc.h" // for operator new
#include "nsAString.h"
#include "nsCOMPtr.h" // for already_AddRefed
#include "nsDebug.h" // for NS_ERROR, NS_WARNING
#include "nsString.h" // for nsAutoCString
namespace mozilla {
namespace gl {
class BindableTexture;
} // namespace gl
namespace gfx {
class DataSourceSurface;
} // namespace gfx
namespace layers {
class TextureSource;
class CompositingRenderTargetOGL : public CompositingRenderTarget {
typedef mozilla::gl::GLContext GLContext;
friend class CompositorOGL;
enum class GLResourceOwnership : uint8_t {
// Framebuffer and texture will be deleted when the RenderTarget is
// destroyed.
// Framebuffer and texture are only used by the RenderTarget, but never
// deleted.
struct InitParams {
GLenum mFBOTextureTarget;
SurfaceInitMode mInitMode;
const char* Name() const override { return "CompositingRenderTargetOGL"; }
* Create a render target around the default FBO, for rendering straight to
* the window.
static already_AddRefed<CompositingRenderTargetOGL> CreateForWindow(
CompositorOGL* aCompositor, const gfx::IntSize& aSize) {
RefPtr<CompositingRenderTargetOGL> result = new CompositingRenderTargetOGL(
aCompositor, gfx::IntRect(gfx::IntPoint(), aSize), gfx::IntPoint(),
aSize, GLResourceOwnership::EXTERNALLY_OWNED, 0, 0, Nothing());
return result.forget();
static already_AddRefed<CompositingRenderTargetOGL>
CreateForNewFBOAndTakeOwnership(CompositorOGL* aCompositor, GLuint aTexture,
GLuint aFBO, const gfx::IntRect& aRect,
const gfx::IntPoint& aClipSpaceOrigin,
const gfx::IntSize& aPhySize,
GLenum aFBOTextureTarget,
SurfaceInitMode aInit) {
RefPtr<CompositingRenderTargetOGL> result = new CompositingRenderTargetOGL(
aCompositor, aRect, aClipSpaceOrigin, aPhySize,
GLResourceOwnership::OWNED_BY_RENDER_TARGET, aTexture, aFBO,
Some(InitParams{aFBOTextureTarget, aInit}));
return result.forget();
static already_AddRefed<CompositingRenderTargetOGL>
CreateForExternallyOwnedFBO(CompositorOGL* aCompositor, GLuint aFBO,
const gfx::IntRect& aRect,
const gfx::IntPoint& aClipSpaceOrigin) {
RefPtr<CompositingRenderTargetOGL> result = new CompositingRenderTargetOGL(
aCompositor, aRect, aClipSpaceOrigin, aRect.Size(),
GLResourceOwnership::EXTERNALLY_OWNED, 0, aFBO, Nothing());
return result.forget();
void BindTexture(GLenum aTextureUnit, GLenum aTextureTarget);
* Call when we want to draw into our FBO
void BindRenderTarget();
bool IsWindow() { return mFBO == 0; }
GLuint GetFBO() const;
GLuint GetTextureHandle() const {
return mTextureHandle;
// TextureSourceOGL
TextureSourceOGL* AsSourceOGL() override {
// XXX - Bug 900770
"CompositingRenderTargetOGL should not be used as a TextureSource");
return nullptr;
gfx::IntSize GetSize() const override { return mSize; }
// The point that DrawGeometry's aClipRect is relative to. Will be (0, 0) for
// root render targets and equal to GetOrigin() for non-root render targets.
gfx::IntPoint GetClipSpaceOrigin() const { return mClipSpaceOrigin; }
gfx::SurfaceFormat GetFormat() const override {
// XXX - Should it be implemented ? is the above assert true ?
MOZ_ASSERT(false, "Not implemented");
return gfx::SurfaceFormat::UNKNOWN;
// In render target coordinates, i.e. the same space as GetOrigin().
// NOT relative to mClipSpaceOrigin!
void SetClipRect(const Maybe<gfx::IntRect>& aRect) { mClipRect = aRect; }
const Maybe<gfx::IntRect>& GetClipRect() const { return mClipRect; }
already_AddRefed<gfx::DataSourceSurface> Dump(
Compositor* aCompositor) override;
const gfx::IntSize& GetInitSize() const { return mSize; }
const gfx::IntSize& GetPhysicalSize() const { return mPhySize; }
CompositingRenderTargetOGL(CompositorOGL* aCompositor,
const gfx::IntRect& aRect,
const gfx::IntPoint& aClipSpaceOrigin,
const gfx::IntSize& aPhySize,
GLResourceOwnership aGLResourceOwnership,
GLuint aTexure, GLuint aFBO,
const Maybe<InitParams>& aNeedInitialization)
: CompositingRenderTarget(aRect.TopLeft()),
mFBO(aFBO) {
* Actually do the initialisation.
* We do this lazily so that when we first set this render target on the
* compositor we do not have to re-bind the FBO after unbinding it, or
* alternatively leave the FBO bound after creation. Note that we leave our
* FBO bound, and so calling this method is only suitable when about to use
* this render target.
void Initialize(GLenum aFBOTextureTarget);
* Some() between construction and Initialize, if initialization was
* requested.
Maybe<InitParams> mNeedInitialization;
* Users of render target would draw in logical size, but it is
* actually drawn to a surface in physical size. GL surfaces have
* a limitation on their size, a smaller surface would be
* allocated for the render target if the caller requests in a
* size too big.
gfx::IntSize mSize; // Logical size, the expected by callers.
gfx::IntSize mPhySize; // Physical size, the real size of the surface.
* There is temporary a cycle between the compositor and the render target,
* each having a strong ref to the other. The compositor's reference to
* the target is always cleared at the end of a frame.
RefPtr<CompositorOGL> mCompositor;
RefPtr<GLContext> mGL;
Maybe<gfx::IntRect> mClipRect;
gfx::IntPoint mClipSpaceOrigin;
GLResourceOwnership mGLResourceOwnership;
GLuint mTextureHandle;
GLuint mFBO;
} // namespace layers
} // namespace mozilla