// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ppapi/c/pp_errors.h"
#include "ppapi/cpp/core.h"
#include "ppapi/cpp/graphics_3d.h"
#include "ppapi/cpp/graphics_3d_client.h"
#include "ppapi/cpp/input_event.h"
#include "ppapi/cpp/instance.h"
#include "ppapi/cpp/module.h"
#include "ppapi/cpp/rect.h"
#include "spinning_cube.h"
#include "ppapi/lib/gl/gles2/gl2ext_ppapi.h"
#include "ppapi/utility/completion_callback_factory.h"

// Use assert as a makeshift CHECK, even in non-debug mode.
// Since <assert.h> redefines assert on every inclusion (it doesn't use
// include-guards), make sure this is the last file #include'd in this file.
#undef NDEBUG
#include <assert.h>
#include <stdint.h>

#include <stdio.h>

namespace {

class DemoInstance : public pp::Instance, public pp::Graphics3DClient {
public:
    DemoInstance(PP_Instance instance);
    virtual ~DemoInstance();
    // pp::Instance implementation (see PPP_Instance).
    virtual bool Init(uint32_t argc, const char* argn[], const char* argv[]);
    virtual void DidChangeView(const pp::Rect& position,
                                                         const pp::Rect& clip);
    virtual bool HandleInputEvent(const pp::InputEvent& event) {
        // TODO(yzshen): Handle input events.
        return true;
    }
    // pp::Graphics3DClient implementation.
    virtual void Graphics3DContextLost();
private:
    // GL-related functions.
    void InitGL(int32_t result);
    void Paint(int32_t result);
    pp::Size plugin_size_;
    pp::CompletionCallbackFactory<DemoInstance> callback_factory_;
    // Owned data.
    pp::Graphics3D* context_;
    SpinningCube cube_;
};

DemoInstance::DemoInstance(PP_Instance instance)
        : pp::Instance(instance),
            pp::Graphics3DClient(this),
            callback_factory_(this),
            context_(NULL) {}

DemoInstance::~DemoInstance() {
    assert(glTerminatePPAPI());
    delete context_;
}

bool DemoInstance::Init(uint32_t /*argc*/,
                                                const char* /*argn*/[],
                                                const char* /*argv*/[]) {
    RequestInputEvents(PP_INPUTEVENT_CLASS_MOUSE);
    return !!glInitializePPAPI(pp::Module::Get()->get_browser_interface());
}

void DemoInstance::DidChangeView(
        const pp::Rect& position, const pp::Rect& /*clip*/) {
    if (position.width() == 0 || position.height() == 0)
        return;
    plugin_size_ = position.size();
    // Initialize graphics.
    InitGL(0);
}

void DemoInstance::Graphics3DContextLost() {
    delete context_;
    context_ = NULL;
    pp::CompletionCallback cb = callback_factory_.NewCallback(
            &DemoInstance::InitGL);
    pp::Module::Get()->core()->CallOnMainThread(0, cb, 0);
}

void DemoInstance::InitGL(int32_t /*result*/) {
    assert(plugin_size_.width() && plugin_size_.height());
    if (context_) {
        context_->ResizeBuffers(plugin_size_.width(), plugin_size_.height());
        return;
    }
    int32_t context_attributes[] = {
        PP_GRAPHICS3DATTRIB_ALPHA_SIZE, 8,
        PP_GRAPHICS3DATTRIB_BLUE_SIZE, 8,
        PP_GRAPHICS3DATTRIB_GREEN_SIZE, 8,
        PP_GRAPHICS3DATTRIB_RED_SIZE, 8,
        PP_GRAPHICS3DATTRIB_DEPTH_SIZE, 0,
        PP_GRAPHICS3DATTRIB_STENCIL_SIZE, 0,
        PP_GRAPHICS3DATTRIB_SAMPLES, 0,
        PP_GRAPHICS3DATTRIB_SAMPLE_BUFFERS, 0,
        PP_GRAPHICS3DATTRIB_WIDTH, plugin_size_.width(),
        PP_GRAPHICS3DATTRIB_HEIGHT, plugin_size_.height(),
        PP_GRAPHICS3DATTRIB_NONE,
    };
    context_ = new pp::Graphics3D(this, context_attributes);
    assert(!context_->is_null());
    assert(BindGraphics(*context_));
    glSetCurrentContextPPAPI(context_->pp_resource());
    cube_.Init(plugin_size_.width(), plugin_size_.height());
    Paint(PP_OK);
}

void DemoInstance::Paint(int32_t result) {
    if (result != PP_OK || !context_)
        return;
    cube_.UpdateForTimeDelta(0.02f);
    cube_.Draw();
    context_->SwapBuffers(callback_factory_.NewCallback(&DemoInstance::Paint));
}

// This object is the global object representing this plugin library as long
// as it is loaded.
class DemoModule : public pp::Module {
public:
    DemoModule() : Module() {}
    virtual ~DemoModule() {}
    virtual pp::Instance* CreateInstance(PP_Instance instance) {
        return new DemoInstance(instance);
    }
};

}

// anonymous namespace
namespace pp {
    // Factory function for your specialization of the Module object.
    Module* CreateModule() {
        return new DemoModule();
    }
}    // namespace pp