/*
 * Copyright 2012-2013 Tri-Edge AI <triedgeai@gmail.com>
 * Copyright 2014 Haiku, Inc. All rights reserved.
 *
 * Distributed under the terms of the MIT license.
 *
 * Authors:
 *              Tri-Edge AI
 *              John Scipione, jscipione@gmail.com
 */


#include "GravityView.h"

#include "Gravity.h"
#include "GravitySource.h"
#include "Particle.h"

#include <GL/glu.h>


GravityView::GravityView(BRect frame, Gravity* parent)
        :
        BGLView(frame, B_EMPTY_STRING, B_FOLLOW_NONE, 0,
                BGL_RGB | BGL_DEPTH | BGL_DOUBLE),
        fParent(parent),
        fGravitySource(new GravitySource()),
        fSize(128 << parent->Config.ParticleCount),
        fShade(parent->Config.ShadeID)
{
        Particle::Initialize(fSize, fShade);
}


GravityView::~GravityView()
{
        Particle::Terminate();
        delete fGravitySource;
}


void
GravityView::AttachedToWindow()
{
        LockGL();
        BGLView::AttachedToWindow();

        glClearDepth(1.0f);

        glEnable(GL_BLEND);
        glBlendFunc(GL_SRC_ALPHA, GL_ONE);

        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        gluPerspective(45.0f, Bounds().Width() / Bounds().Height(), 2.0f, 20000.0f);
        glMatrixMode(GL_MODELVIEW);
        glLoadIdentity();

        glTranslatef(0.0f, 0.0f, -30.0f);

        glDepthMask(GL_FALSE);

        UnlockGL();
}


void
GravityView::DirectDraw()
{
        int32 size = 128 << fParent->Config.ParticleCount;
        int32 shade = fParent->Config.ShadeID;

        // resize particle list if needed
        if (size > fSize)
                Particle::AddParticles(size, shade);
        else if (size < fSize)
                Particle::RemoveParticles(size, shade);

        // recolor particles if needed
        if (shade != fShade)
                Particle::ColorParticles(size, shade);

        fSize = size;
        fShade = shade;

        LockGL();

        glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        Particle::Tick();
        fGravitySource->Tick();

        SwapBuffers();

        UnlockGL();
}