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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 "mozilla/Preferences.h"

#include "SharedSurfaceGralloc.h"

#include "GLContext.h"
#include "SharedSurfaceGL.h"
#include "SurfaceFactory.h"
#include "GLLibraryEGL.h"
#include "mozilla/layers/ShadowLayers.h"

#include "ui/GraphicBuffer.h"
#include "../layers/ipc/ShadowLayers.h"

#define DEBUG_GRALLOC
#ifdef DEBUG_GRALLOC
#define DEBUG_PRINT(...) do { printf_stderr(__VA_ARGS__); } while (0)
#else
#define DEBUG_PRINT(...) do { } while (0)
#endif

using namespace mozilla;
using namespace mozilla::gfx;
using namespace gl;
using namespace layers;
using namespace android;

static bool sForceReadPixelsToFence = false;


SurfaceFactory_Gralloc::SurfaceFactory_Gralloc(GLContext* prodGL,
                                               const SurfaceCaps& caps,
                                               layers::ISurfaceAllocator* allocator)
    : SurfaceFactory_GL(prodGL, SharedSurfaceType::Gralloc, caps)
{
    if (caps.surfaceAllocator) {
        allocator = caps.surfaceAllocator;
    }

    MOZ_ASSERT(allocator);

    mAllocator = allocator->asWeakPtr();
}

SharedSurface_Gralloc*
SharedSurface_Gralloc::Create(GLContext* prodGL,
                              const GLFormats& formats,
                              const gfxIntSize& size,
                              bool hasAlpha,
                              ISurfaceAllocator* allocator)
{
    static bool runOnce = true;
    if (runOnce) {
        sForceReadPixelsToFence = false;
        mozilla::Preferences::AddBoolVarCache(&sForceReadPixelsToFence,
                                              "gfx.gralloc.fence-with-readpixels");
        runOnce = false;
    }

    GLLibraryEGL* egl = prodGL->GetLibraryEGL();
    MOZ_ASSERT(egl);

    DEBUG_PRINT("SharedSurface_Gralloc::Create -------\n");

    if (!HasExtensions(egl, prodGL))
        return nullptr;

    SurfaceDescriptor baseDesc;
    SurfaceDescriptorGralloc desc;

    gfxASurface::gfxContentType type = hasAlpha ? gfxASurface::CONTENT_COLOR_ALPHA
                                                : gfxASurface::CONTENT_COLOR;
    if (!allocator->AllocSurfaceDescriptorWithCaps(size, type, USING_GL_RENDERING_ONLY, &baseDesc))
        return false;

    if (baseDesc.type() != SurfaceDescriptor::TSurfaceDescriptorGralloc) {
        allocator->DestroySharedSurface(&baseDesc);
        return false;
    }

    desc = baseDesc.get_SurfaceDescriptorGralloc();

    sp<GraphicBuffer> buffer = GrallocBufferActor::GetFrom(desc);

    EGLDisplay display = egl->Display();
    EGLClientBuffer clientBuffer = buffer->getNativeBuffer();
    EGLint attrs[] = {
        LOCAL_EGL_NONE, LOCAL_EGL_NONE
    };
    EGLImage image = egl->fCreateImage(display,
                                       EGL_NO_CONTEXT,
                                       LOCAL_EGL_NATIVE_BUFFER_ANDROID,
                                       clientBuffer, attrs);
    if (!image) {
        allocator->DestroySharedSurface(&baseDesc);
        return nullptr;
    }

    prodGL->MakeCurrent();
    GLuint prodTex = 0;
    prodGL->fGenTextures(1, &prodTex);
    ScopedBindTexture autoTex(prodGL, prodTex);

    prodGL->fTexParameteri(LOCAL_GL_TEXTURE_2D, LOCAL_GL_TEXTURE_MIN_FILTER, LOCAL_GL_LINEAR);
    prodGL->fTexParameteri(LOCAL_GL_TEXTURE_2D, LOCAL_GL_TEXTURE_MAG_FILTER, LOCAL_GL_LINEAR);
    prodGL->fTexParameteri(LOCAL_GL_TEXTURE_2D, LOCAL_GL_TEXTURE_WRAP_S, LOCAL_GL_CLAMP_TO_EDGE);
    prodGL->fTexParameteri(LOCAL_GL_TEXTURE_2D, LOCAL_GL_TEXTURE_WRAP_T, LOCAL_GL_CLAMP_TO_EDGE);

    prodGL->fEGLImageTargetTexture2D(LOCAL_GL_TEXTURE_2D, image);

    egl->fDestroyImage(display, image);

    SharedSurface_Gralloc *surf = new SharedSurface_Gralloc(prodGL, size, hasAlpha, egl, allocator, desc, prodTex);

    DEBUG_PRINT("SharedSurface_Gralloc::Create: success -- surface %p, GraphicBuffer %p.\n", surf, buffer.get());

    return surf;
}


bool
SharedSurface_Gralloc::HasExtensions(GLLibraryEGL* egl, GLContext* gl)
{
    return egl->HasKHRImageBase() &&
           gl->IsExtensionSupported(GLContext::OES_EGL_image);
}

SharedSurface_Gralloc::~SharedSurface_Gralloc()
{

    DEBUG_PRINT("[SharedSurface_Gralloc %p] destroyed\n", this);

    mGL->MakeCurrent();
    mGL->fDeleteTextures(1, (GLuint*)&mProdTex);

    SurfaceDescriptor desc(mDesc);

    if (mAllocator) {
        mAllocator->DestroySharedSurface(&desc);
    }
}

void
SharedSurface_Gralloc::Fence()
{
    // We should be able to rely on genlock write locks/read locks.
    // But they're broken on some configs, and even a glFinish doesn't
    // work.  glReadPixels seems to, though.
    if (sForceReadPixelsToFence) {
        mGL->MakeCurrent();
        // read a 1x1 pixel
        unsigned char pixels[4];
        mGL->fReadPixels(0, 0, 1, 1, LOCAL_GL_RGBA, LOCAL_GL_UNSIGNED_BYTE, &pixels[0]);
    }
}

bool
SharedSurface_Gralloc::WaitSync()
{
    return true;
}

void
SharedSurface_Gralloc::LockProdImpl()
{
}

void
SharedSurface_Gralloc::UnlockProdImpl()
{
}