moFBManager.cpp

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/*******************************************************************************

                              moFBManager.cpp

  ****************************************************************************
  *                                                                          *
  *   This source is free software; you can redistribute it and/or modify    *
  *   it under the terms of the GNU General Public License as published by   *
  *   the Free Software Foundation; either version 2 of the License, or      *
  *  (at your option) any later version.                                    *
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  *   WITHOUT ANY WARRANTY; without even the implied warranty of             *
  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU      *
  *   General Public License for more details.                               *
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  *   Wide Web at <http://www.gnu.org/copyleft/gpl.html>. You can also       *
  *   obtain it by writing to the Free Software Foundation,                  *
  *   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.         *
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  ****************************************************************************

  Copyright(C) 2006 Fabricio Costa

  Authors:
  Fabricio Costa
  Andrés Colubri

*******************************************************************************/

#include "moFBManager.h"

//===========================================
//
//              moFBManager
//
//===========================================

moFBManager::moFBManager()
{
    SetType( MO_OBJECT_RESOURCE );
    SetResourceType( MO_RESOURCETYPE_FB );
  SetName("fbmanager");
  SetLabelName("fbmanager");
    m_glmanager = NULL;
}

moFBManager::~moFBManager()
{
    Finish();
}

MOboolean moFBManager::Init()
{
    if ( m_pResourceManager ) {
        m_glmanager = m_pResourceManager->GetGLMan();
    }
    m_fbo_array.Init(0, NULL);
    GetScreenBuffers();
    m_fbo_stack_index = -1;
    m_current_fbo = -1;
    return (m_glmanager!=NULL);
}

MOboolean moFBManager::Finish()
{
    m_fbo_array.Finish();
    return true;
}

MOuint moFBManager::CreateFBO()
{
    moFBO* new_fbo = new moFBO();
    new_fbo->Init(m_glmanager);
    m_fbo_array.Add(new_fbo);
    return m_fbo_array.Count() - 1;
}

MOboolean moFBManager::DeleteFBO(MOuint p_fbo)
{
    if ( p_fbo!=(MOuint)MO_UNDEFINED && p_fbo < m_fbo_array.Count())
    {
        delete m_fbo_array.GetRef(p_fbo);
        m_fbo_array.Remove(p_fbo);
        UnbindAllFBO();
        return true;
    }
    else return false;
}

MOint moFBManager::GetFBO(MOuint p_target, MOuint p_internal_format, MOuint p_width, MOuint p_height)
{
    for (MOuint i = 0; i < m_fbo_array.Count(); i++)
    {
        if ((m_fbo_array.Get(i)->GetTarget() == p_target) &&
            (m_fbo_array.Get(i)->GetTarget() == p_internal_format) &&
            (m_fbo_array.Get(i)->GetTarget() == p_width) &&
            (m_fbo_array.Get(i)->GetTarget() == p_height))
            return i;
    }
    return -1;
}

void moFBManager::BindScreenFB()
{
    if (m_glmanager->GetCurrentFBO() != 0)
    {
        m_fbo_stack_index++;
        m_fbo_stack[m_fbo_stack_index] = (MOuint)m_current_fbo;

        m_draw_buffer_stack[m_fbo_stack_index] = m_glmanager->GetCurrentDrawBuffer();
        m_read_buffer_stack[m_fbo_stack_index] = m_glmanager->GetCurrentReadBuffer();

        m_glmanager->SetCurrentFBO(0);
        m_glmanager->SetCurrentDrawBuffer(m_screen_draw_buffer);
        m_glmanager->SetCurrentReadBuffer(m_screen_read_buffer);
        m_current_fbo = -1;
    }
}

void moFBManager::UnbindScreenFB()
{
    if (m_glmanager->GetCurrentFBO() == 0) UnbindFBO();
}

MOboolean moFBManager::BindFBO(MOuint p_fbo)
{
    if ( p_fbo!=(MOuint)MO_UNDEFINED && p_fbo < m_fbo_array.Count())
    {
        m_fbo_stack_index++;
        m_fbo_stack[m_fbo_stack_index] = m_current_fbo;

        m_draw_buffer_stack[m_fbo_stack_index] = m_glmanager->GetCurrentDrawBuffer();
        m_read_buffer_stack[m_fbo_stack_index] = m_glmanager->GetCurrentReadBuffer();

        m_fbo_array[p_fbo]->Bind();
        m_current_fbo = p_fbo;
        return true;
    }
    else return false; // Wrong FBO index.
}

MOboolean moFBManager::BindFBO(MOuint p_fbo, MOuint p_attach_point)
{
    if (BindFBO(p_fbo))
    {
        m_fbo_array[p_fbo]->SetDrawTexture(p_attach_point);
        return true;
    }
    else return false;
}

MOboolean moFBManager::BindFBO(MOuint p_fbo, MOuint p_num_attach_points, MOuint *p_attach_point_list)
{
    if (BindFBO(p_fbo))
    {
        SetDrawTextures(p_num_attach_points, p_attach_point_list);
        return true;
    }
    else return false;
}

MOboolean moFBManager::AddTexture(MOuint p_fbo, moTexture* p_pTex, MOuint &p_attach_point)
{
    if ( p_fbo!=(MOuint)MO_UNDEFINED && p_fbo < m_fbo_array.Count())
    {
        m_fbo_array[p_fbo]->AddTexture(p_pTex->GetWidth(), p_pTex->GetHeight(), p_pTex->GetTexParam(), p_pTex->GetGLId(), p_attach_point);
        return true;
    }
    else return false;
}

MOboolean moFBManager::AttachTexture(MOuint p_fbo, moTexture* p_pTex, MOuint p_attach_point)
{
    if ( p_fbo!=(MOuint)MO_UNDEFINED && p_fbo < m_fbo_array.Count())
    {
        m_fbo_array[p_fbo]->AttachTexture(p_pTex->GetWidth(), p_pTex->GetHeight(), p_pTex->GetTexParam(), p_pTex->GetGLId(), p_attach_point);
        return true;
    }
    else return false;
}

void moFBManager::SetDrawTexture(MOuint p_attach_point)
{
    if (-1 < m_current_fbo) m_fbo_array[m_current_fbo]->SetDrawTexture(p_attach_point);
}

void moFBManager::SetDrawTextures(MOuint p_num_attach_points, MOuint *p_attach_point_list)
{
    if (-1 < m_current_fbo)
    {
        GLsizei n = p_num_attach_points;

        for (int i = 0; i < n; i++) m_color_buffers[i] = m_fbo_array[m_current_fbo]->GetColorAttachPoint(p_attach_point_list[i]);
#ifndef OPENGLESV2
        glDrawBuffers(n, m_color_buffers);
#endif
    }
}

void moFBManager::SetReadTexture(MOuint p_attach_point)
{
    if (-1 < m_current_fbo) m_fbo_array[m_current_fbo]->SetReadTexture(p_attach_point);
}

void moFBManager::SetDrawTextureByGLId(MOuint p_glid, MOuint p_width, MOuint p_height, const moTexParam& p_param, MOuint p_def_attach_point)
{
    if (-1 < m_current_fbo) m_fbo_array[m_current_fbo]->SetDrawTexture(p_glid, p_width, p_height, p_param, p_def_attach_point);
}

void moFBManager::SetDrawTexturesByGLId(MOuint p_num_glids, MOuint *p_glid_list, MOuint p_width, MOuint p_height, const moTexParam& p_param)
{
    if (-1 < m_current_fbo)
    {
        GLsizei n = p_num_glids;

        for (int i = 0; i < n; i++)
            m_fbo_array[m_current_fbo]->SetDrawTexture(p_glid_list[i], p_width, p_height, p_param, i);


        for (int i = 0; i < n; i++) m_color_buffers[i] = m_fbo_array[m_current_fbo]->GetColorAttachPoint(i);
#ifndef OPENGLESV2
        glDrawBuffers(n, m_color_buffers);
#endif
    }
}

void moFBManager::SetReadTextureByGLId(MOuint p_glid, MOuint p_width, MOuint p_height, const moTexParam& p_param, MOuint p_def_attach_point)
{
    if (-1 < m_current_fbo) m_fbo_array[m_current_fbo]->SetReadTexture(p_glid, p_width, p_height, p_param, p_def_attach_point);
}

MOint moFBManager::SetDrawTexture(moTexture* p_pTex, MOuint p_def_attach_point)
{
    MOint result = 1;
    if ((-1 < m_current_fbo) && (p_pTex != NULL))
    {
        if (p_pTex->GetFBO() == NULL)
            // Attaching by GL id to the currently binded fbo.
            SetDrawTextureByGLId(p_pTex->GetGLId(), p_pTex->GetWidth(), p_pTex->GetHeight(), p_pTex->GetTexParam(), p_def_attach_point);
        else
            // The texture is associated to a particular fbo.
            if (p_pTex->GetFBO() == m_fbo_array[m_current_fbo])
                if ( (MOuint)MO_UNDEFINED != p_pTex->GetFBOAttachPoint() )
                    // The texture is associated to a particular attachement point.
                    SetDrawTexture(p_pTex->GetFBOAttachPoint());
                else
                    // Attaching by GL id to the currently binded fbo.
                    SetDrawTextureByGLId(p_pTex->GetGLId(), p_pTex->GetWidth(), p_pTex->GetHeight(), p_pTex->GetTexParam(), p_def_attach_point);
            else result = 0; // Failure the currently binded fbo is different to the fbo assigned to the texture.
    }
    else result = 0; // There is no fbo currently binded or the texture is NULL.
    return result;
}

MOint moFBManager::SetDrawTextures(moTextureArray &p_tex_array)
{
    MOint result = 1;
    if (-1 < m_current_fbo)
    {
        GLsizei n = p_tex_array.Count();

        for (int i = 0; i < n; i++)
            if (p_tex_array[i] != NULL)
                m_fbo_array[m_current_fbo]->SetDrawTexture(p_tex_array[i]->GetGLId(), p_tex_array[i]->GetWidth(), p_tex_array[i]->GetHeight(), p_tex_array[i]->GetTexParam(), i);

        
        for (int i = 0; i < n; i++) m_color_buffers[i] = m_fbo_array[m_current_fbo]->GetColorAttachPoint(i);
#ifndef OPENGLESV2
        glDrawBuffers(n, m_color_buffers);
#endif
    }
    return result;
}

MOint moFBManager::SetReadTexture(moTexture* p_pTex, MOuint p_def_attach_point)
{
    MOint result = 1;
    if ((-1 < m_current_fbo) && (p_pTex != NULL))
    {
        if (p_pTex->GetFBO() == NULL)
            // Attaching by GL id to the currently binded fbo.
            SetReadTextureByGLId(p_pTex->GetGLId(), p_pTex->GetWidth(), p_pTex->GetHeight(), p_pTex->GetTexParam(), p_def_attach_point);
        else
            // The texture is associated to a particular fbo.
            if (p_pTex->GetFBO() == m_fbo_array[m_current_fbo])
                if ( (MOuint)MO_UNDEFINED != p_pTex->GetFBOAttachPoint())
                    // The texture is associated to a particular attachement point.
                    SetReadTexture(p_pTex->GetFBOAttachPoint());
                else
                    // Attaching by GL id to the currently binded fbo.
                    SetReadTextureByGLId(p_pTex->GetGLId(), p_pTex->GetWidth(), p_pTex->GetHeight(), p_pTex->GetTexParam(), p_def_attach_point);
            else result = 0; // Failure the currently binded fbo is different to the fbo assigned to the texture.
    }
    else result = 0; // There is no fbo currently binded or the texture is NULL.
    return result;
}

void moFBManager::UnbindFBO()
{
    if (0 < m_fbo_stack_index)
    {
        MOuint previous_fbo = m_fbo_stack[m_fbo_stack_index];
        m_fbo_array[previous_fbo]->Bind();
        m_current_fbo = previous_fbo;

        MOuint prev_draw_buffer = m_draw_buffer_stack[m_fbo_stack_index];
        MOuint prev_read_buffer = m_read_buffer_stack[m_fbo_stack_index];

        m_glmanager->SetCurrentDrawBuffer(prev_draw_buffer);
        m_glmanager->SetCurrentReadBuffer(prev_read_buffer);

        m_fbo_stack_index--;
    }
    else
    {
        m_glmanager->SetCurrentFBO(0);
        m_glmanager->SetCurrentDrawBuffer(m_screen_draw_buffer);
        m_glmanager->SetCurrentReadBuffer(m_screen_read_buffer);
        m_fbo_stack_index = -1;
        m_current_fbo = -1;
    }
}

void moFBManager::UnbindAllFBO()
{
    m_glmanager->SetCurrentFBO(0);
    m_glmanager->SetCurrentDrawBuffer(m_screen_draw_buffer);
    m_glmanager->SetCurrentReadBuffer(m_screen_read_buffer);
    m_fbo_stack_index = -1;
    m_current_fbo = -1;
}

void moFBManager::GetScreenBuffers()
{
#ifndef OPENGLESV2
    glGetIntegerv(GL_DRAW_BUFFER, &m_screen_draw_buffer);
    glGetIntegerv(GL_READ_BUFFER, &m_screen_read_buffer);
#endif
}