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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 "SharedSurfaceIO.h"
#include "GLContextCGL.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/gfx/MacIOSurface.h"
#include "mozilla/layers/LayersSurfaces.h" // for SurfaceDescriptor, etc
#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);
auto size = gfx::IntSize::Truncate(ioSurf->GetWidth(), ioSurf->GetHeight());
typedef SharedSurface_IOSurface ptrT;
UniquePtr<ptrT> ret( new ptrT(ioSurf, gl, size, hasAlpha) );
return Move(ret);
}
void
SharedSurface_IOSurface::ProducerReleaseImpl()
{
mGL->MakeCurrent();
mGL->fFlush();
}
bool
SharedSurface_IOSurface::CopyTexImage2D(GLenum target, GLint level, GLenum internalformat,
GLint x, GLint y, GLsizei width, GLsizei height,
GLint border)
{
/* Bug 896693 - OpenGL framebuffers that are backed by IOSurface on OSX expose a bug
* in glCopyTexImage2D --- internalformats GL_ALPHA, GL_LUMINANCE, GL_LUMINANCE_ALPHA
* return the wrong results. To work around, copy framebuffer to a temporary texture
* using GL_RGBA (which works), attach as read framebuffer and glCopyTexImage2D
* instead.
*/
// https://www.opengl.org/sdk/docs/man3/xhtml/glCopyTexImage2D.xml says that width or
// height set to 0 results in a NULL texture. Lets not do any work and punt to
// original glCopyTexImage2D, since the FBO below will fail when trying to attach a
// texture of 0 width or height.
if (width == 0 || height == 0)
return false;
switch (internalformat) {
case LOCAL_GL_ALPHA:
case LOCAL_GL_LUMINANCE:
case LOCAL_GL_LUMINANCE_ALPHA:
break;
default:
return false;
}
MOZ_ASSERT(mGL->IsCurrent());
ScopedTexture destTex(mGL);
{
ScopedBindTexture bindTex(mGL, destTex.Texture());
mGL->fTexParameteri(LOCAL_GL_TEXTURE_2D, LOCAL_GL_TEXTURE_MIN_FILTER,
LOCAL_GL_NEAREST);
mGL->fTexParameteri(LOCAL_GL_TEXTURE_2D, LOCAL_GL_TEXTURE_MAG_FILTER,
LOCAL_GL_NEAREST);
mGL->fTexParameteri(LOCAL_GL_TEXTURE_2D, LOCAL_GL_TEXTURE_WRAP_S,
LOCAL_GL_CLAMP_TO_EDGE);
mGL->fTexParameteri(LOCAL_GL_TEXTURE_2D, LOCAL_GL_TEXTURE_WRAP_T,
LOCAL_GL_CLAMP_TO_EDGE);
mGL->raw_fCopyTexImage2D(LOCAL_GL_TEXTURE_2D, 0, LOCAL_GL_RGBA, x, y, width,
height, 0);
}
ScopedFramebufferForTexture tmpFB(mGL, destTex.Texture(), LOCAL_GL_TEXTURE_2D);
ScopedBindFramebuffer bindFB(mGL, tmpFB.FB());
mGL->raw_fCopyTexImage2D(target, level, internalformat, x, y, width, height, border);
return true;
}
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->raw_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->raw_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,
true)
, mIOSurf(ioSurf)
{
gl->MakeCurrent();
mProdTex = 0;
gl->fGenTextures(1, &mProdTex);
BackTextureWithIOSurf(gl, mProdTex, mIOSurf);
}
SharedSurface_IOSurface::~SharedSurface_IOSurface()
{
if (!mGL || !mGL->MakeCurrent())
return;
mGL->fDeleteTextures(1, &mProdTex);
}
bool
SharedSurface_IOSurface::ToSurfaceDescriptor(layers::SurfaceDescriptor* const out_descriptor)
{
bool isOpaque = !mHasAlpha;
*out_descriptor = layers::SurfaceDescriptorMacIOSurface(mIOSurf->GetIOSurfaceID(),
mIOSurf->GetContentsScaleFactor(),
isOpaque);
return true;
}
bool
SharedSurface_IOSurface::ReadbackBySharedHandle(gfx::DataSourceSurface* out_surface)
{
MOZ_ASSERT(out_surface);
mIOSurf->Lock();
size_t bytesPerRow = mIOSurf->GetBytesPerRow();
size_t ioWidth = mIOSurf->GetDevicePixelWidth();
size_t ioHeight = mIOSurf->GetDevicePixelHeight();
const unsigned char* ioData = (unsigned char*)mIOSurf->GetBaseAddress();
gfx::DataSourceSurface::ScopedMap map(out_surface, gfx::DataSourceSurface::WRITE);
if (!map.IsMapped()) {
mIOSurf->Unlock();
return false;
}
for (size_t i = 0; i < ioHeight; i++) {
memcpy(map.GetData() + i * map.GetStride(),
ioData + i * bytesPerRow, ioWidth * 4);
}
mIOSurf->Unlock();
return true;
}
////////////////////////////////////////////////////////////////////////
// SurfaceFactory_IOSurface
/*static*/ UniquePtr<SurfaceFactory_IOSurface>
SurfaceFactory_IOSurface::Create(GLContext* gl, const SurfaceCaps& caps,
const RefPtr<layers::LayersIPCChannel>& allocator,
const layers::TextureFlags& flags)
{
auto maxDims = gfx::IntSize::Truncate(MacIOSurface::GetMaxWidth(),
MacIOSurface::GetMaxHeight());
typedef SurfaceFactory_IOSurface ptrT;
UniquePtr<ptrT> ret( new ptrT(gl, caps, allocator, flags, 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);
}
} // namespace gl
} // namespace mozilla
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