gecko/gfx/gl/SharedSurfaceIO.cpp

181 lines
5.4 KiB
C++

/* -*- 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 "SharedSurfaceIO.h"
#include "GLContextCGL.h"
#include "mozilla/gfx/MacIOSurface.h"
#include "mozilla/DebugOnly.h"
#include "ScopedGLHelpers.h"
namespace mozilla {
namespace gl {
/*static*/ UniquePtr<SharedSurface_IOSurface>
SharedSurface_IOSurface::Create(const RefPtr<MacIOSurface>& ioSurf,
GLContext* gl,
bool hasAlpha)
{
MOZ_ASSERT(ioSurf);
MOZ_ASSERT(gl);
gfx::IntSize size(ioSurf->GetWidth(), ioSurf->GetHeight());
typedef SharedSurface_IOSurface ptrT;
UniquePtr<ptrT> ret( new ptrT(ioSurf, gl, size, hasAlpha) );
return Move(ret);
}
void
SharedSurface_IOSurface::Fence()
{
mGL->MakeCurrent();
mGL->fFlush();
}
bool
SharedSurface_IOSurface::ReadPixels(GLint x, GLint y, GLsizei width, GLsizei height,
GLenum format, GLenum type, GLvoid* pixels)
{
// Calling glReadPixels when an IOSurface is bound to the current framebuffer
// can cause corruption in following glReadPixel calls (even if they aren't
// reading from an IOSurface).
// We workaround this by copying to a temporary texture, and doing the readback
// from that.
MOZ_ASSERT(mGL->IsCurrent());
ScopedTexture destTex(mGL);
{
ScopedFramebufferForTexture srcFB(mGL, ProdTexture(), ProdTextureTarget());
ScopedBindFramebuffer bindFB(mGL, srcFB.FB());
ScopedBindTexture bindTex(mGL, destTex.Texture());
mGL->fCopyTexImage2D(LOCAL_GL_TEXTURE_2D, 0,
mHasAlpha ? LOCAL_GL_RGBA : LOCAL_GL_RGB,
x, y,
width, height, 0);
}
ScopedFramebufferForTexture destFB(mGL, destTex.Texture());
ScopedBindFramebuffer bindFB(mGL, destFB.FB());
mGL->fReadPixels(0, 0, width, height, format, type, pixels);
return true;
}
static void
BackTextureWithIOSurf(GLContext* gl, GLuint tex, MacIOSurface* ioSurf)
{
MOZ_ASSERT(gl->IsCurrent());
ScopedBindTexture texture(gl, tex, LOCAL_GL_TEXTURE_RECTANGLE_ARB);
gl->fTexParameteri(LOCAL_GL_TEXTURE_RECTANGLE_ARB,
LOCAL_GL_TEXTURE_MIN_FILTER,
LOCAL_GL_LINEAR);
gl->fTexParameteri(LOCAL_GL_TEXTURE_RECTANGLE_ARB,
LOCAL_GL_TEXTURE_MAG_FILTER,
LOCAL_GL_LINEAR);
gl->fTexParameteri(LOCAL_GL_TEXTURE_RECTANGLE_ARB,
LOCAL_GL_TEXTURE_WRAP_S,
LOCAL_GL_CLAMP_TO_EDGE);
gl->fTexParameteri(LOCAL_GL_TEXTURE_RECTANGLE_ARB,
LOCAL_GL_TEXTURE_WRAP_T,
LOCAL_GL_CLAMP_TO_EDGE);
CGLContextObj cgl = GLContextCGL::Cast(gl)->GetCGLContext();
MOZ_ASSERT(cgl);
ioSurf->CGLTexImageIOSurface2D(cgl);
}
SharedSurface_IOSurface::SharedSurface_IOSurface(const RefPtr<MacIOSurface>& ioSurf,
GLContext* gl,
const gfx::IntSize& size,
bool hasAlpha)
: SharedSurface(SharedSurfaceType::IOSurface,
AttachmentType::GLTexture,
gl,
size,
hasAlpha)
, mIOSurf(ioSurf)
, mCurConsGL(nullptr)
, mConsTex(0)
{
gl->MakeCurrent();
mProdTex = 0;
gl->fGenTextures(1, &mProdTex);
BackTextureWithIOSurf(gl, mProdTex, mIOSurf);
}
GLuint
SharedSurface_IOSurface::ConsTexture(GLContext* consGL)
{
if (!mCurConsGL) {
mCurConsGL = consGL;
}
MOZ_ASSERT(consGL == mCurConsGL);
if (!mConsTex) {
consGL->MakeCurrent();
mConsTex = 0;
consGL->fGenTextures(1, &mConsTex);
BackTextureWithIOSurf(consGL, mConsTex, mIOSurf);
}
return mConsTex;
}
SharedSurface_IOSurface::~SharedSurface_IOSurface()
{
if (mProdTex) {
DebugOnly<bool> success = mGL->MakeCurrent();
MOZ_ASSERT(success);
mGL->fDeleteTextures(1, &mProdTex);
mGL->fDeleteTextures(1, &mConsTex); // This will work if we're shared.
}
}
////////////////////////////////////////////////////////////////////////
// SurfaceFactory_IOSurface
/*static*/ UniquePtr<SurfaceFactory_IOSurface>
SurfaceFactory_IOSurface::Create(GLContext* gl,
const SurfaceCaps& caps)
{
gfx::IntSize maxDims(MacIOSurface::GetMaxWidth(),
MacIOSurface::GetMaxHeight());
typedef SurfaceFactory_IOSurface ptrT;
UniquePtr<ptrT> ret( new ptrT(gl, caps, maxDims) );
return Move(ret);
}
UniquePtr<SharedSurface>
SurfaceFactory_IOSurface::CreateShared(const gfx::IntSize& size)
{
if (size.width > mMaxDims.width ||
size.height > mMaxDims.height)
{
return nullptr;
}
bool hasAlpha = mReadCaps.alpha;
RefPtr<MacIOSurface> ioSurf;
ioSurf = MacIOSurface::CreateIOSurface(size.width, size.height, 1.0,
hasAlpha);
if (!ioSurf) {
NS_WARNING("Failed to create MacIOSurface.");
return nullptr;
}
return SharedSurface_IOSurface::Create(ioSurf, mGL, hasAlpha);
}
}
}