gecko-dev/gfx/gl/SharedSurfaceIO.cpp

151 lines
4.5 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 {
using namespace gfx;
/* static */ SharedSurface_IOSurface*
SharedSurface_IOSurface::Create(MacIOSurface* surface, GLContext *gl, bool hasAlpha)
{
MOZ_ASSERT(surface);
MOZ_ASSERT(gl);
gfx::IntSize size(surface->GetWidth(), surface->GetHeight());
return new SharedSurface_IOSurface(surface, gl, size, hasAlpha);
}
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,
HasAlpha() ? 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(MacIOSurface* surface,
GLContext* gl,
const gfx::IntSize& size,
bool hasAlpha)
: SharedSurface_GL(SharedSurfaceType::IOSurface, AttachmentType::GLTexture, gl, size, hasAlpha)
, mSurface(surface)
, mCurConsGL(nullptr)
, mConsTex(0)
{
gl->MakeCurrent();
mProdTex = 0;
gl->fGenTextures(1, &mProdTex);
BackTextureWithIOSurf(gl, mProdTex, surface);
}
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, mSurface);
}
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.
}
}
SharedSurface*
SurfaceFactory_IOSurface::CreateShared(const gfx::IntSize& size)
{
bool hasAlpha = mReadCaps.alpha;
RefPtr<MacIOSurface> surf =
MacIOSurface::CreateIOSurface(size.width, size.height, 1.0, hasAlpha);
if (!surf) {
NS_WARNING("Failed to create MacIOSurface.");
return nullptr;
}
return SharedSurface_IOSurface::Create(surf, mGL, hasAlpha);
}
}
}