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/*
* Copyright (C) 2005-2008 Team XBMC
* http://www.xbmc.org
*
* This Program 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, or (at your option)
* any later version.
*
* This Program is distributed in the hope that it will be useful,
* but 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.
*
* You should have received a copy of the GNU General Public License
* along with XBMC; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
* http://www.gnu.org/copyleft/gpl.html
*
*/
#include "system.h"
#if defined(HAS_GL) || HAS_GLES == 2
#include "../xbmc/Settings.h"
#include "WindowingFactory.h"
#include "FrameBufferObject.h"
#include "utils/log.h"
#if HAS_GLES == 2
// For OpenGL ES2.0, FBO are not extensions but part of the API.
#define glGenFramebuffersEXT glGenFramebuffers
#define glDeleteFramebuffersEXT glDeleteFramebuffers
#define glFramebufferTexture2DEXT glFramebufferTexture2D
#define glCheckFramebufferStatusEXT glCheckFramebufferStatus
#define GL_COLOR_ATTACHMENT0_EXT GL_COLOR_ATTACHMENT0
#define GL_FRAMEBUFFER_COMPLETE_EXT GL_FRAMEBUFFER_COMPLETE
#endif
//////////////////////////////////////////////////////////////////////
// CFrameBufferObject
//////////////////////////////////////////////////////////////////////
CFrameBufferObject::CFrameBufferObject()
{
m_fbo = 0;
m_valid = false;
m_supported = false;
m_bound = false;
m_texid = 0;
}
bool CFrameBufferObject::IsSupported()
{
if(g_Windowing.IsExtSupported("GL_EXT_framebuffer_object"))
m_supported = true;
else
m_supported = false;
return m_supported;
}
bool CFrameBufferObject::Initialize()
{
if (!IsSupported())
return false;
Cleanup();
glGenFramebuffersEXT(1, &m_fbo);
VerifyGLState();
if (!m_fbo)
return false;
m_valid = true;
return true;
}
void CFrameBufferObject::Cleanup()
{
if (!IsValid())
return;
if (m_fbo)
glDeleteFramebuffersEXT(1, &m_fbo);
if (m_texid)
glDeleteTextures(1, &m_texid);
m_texid = 0;
m_fbo = 0;
m_valid = false;
m_bound = false;
}
bool CFrameBufferObject::CreateAndBindToTexture(GLenum target, int width, int height, GLenum format,
GLenum filter, GLenum clampmode)
{
if (!IsValid())
return false;
if (m_texid)
glDeleteTextures(1, &m_texid);
glGenTextures(1, &m_texid);
glBindTexture(target, m_texid);
glTexImage2D(target, 0, format, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glTexParameteri(target, GL_TEXTURE_WRAP_S, clampmode);
glTexParameteri(target, GL_TEXTURE_WRAP_T, clampmode);
glTexParameteri(target, GL_TEXTURE_MAG_FILTER, filter);
glTexParameteri(target, GL_TEXTURE_MIN_FILTER, filter);
VerifyGLState();
return BindToTexture(target, m_texid);
}
void CFrameBufferObject::SetFiltering(GLenum target, GLenum mode)
{
glBindTexture(target, m_texid);
glTexParameteri(target, GL_TEXTURE_MAG_FILTER, mode);
glTexParameteri(target, GL_TEXTURE_MIN_FILTER, mode);
}
bool CFrameBufferObject::BindToTexture(GLenum target, GLuint texid)
{
if (!IsValid())
return false;
m_bound = false;
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, m_fbo);
glBindTexture(target, texid);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, target, texid, 0);
VerifyGLState();
GLenum status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
if (status != GL_FRAMEBUFFER_COMPLETE_EXT)
{
VerifyGLState();
return false;
}
m_bound = true;
return true;
}
#endif
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