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// OpenCSG - library for image-based CSG rendering for OpenGL
// Copyright (C) 2010-2026, Florian Kirsch
//
// This library 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.
//
// This library 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 this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110 - 1301 USA.
//
// frameBufferObjectExt.cpp
//
#include "opencsgConfig.h"
#include "frameBufferObjectExt.h"
namespace OpenCSG {
namespace OpenGL {
// ctor / dtor
FrameBufferObjectExt::FrameBufferObjectExt()
: textureTarget(GL_TEXTURE_2D),
textureID(0),
depthID(0),
framebufferID(0),
oldFramebufferID(0),
initialized(false)
{
}
FrameBufferObjectExt::~FrameBufferObjectExt() {
Reset();
}
bool FrameBufferObjectExt::ReadCurrent()
{
bool haveFBO = OPENCSG_HAS_EXT(EXT_framebuffer_object) != 0
&& OPENCSG_HAS_EXT(EXT_packed_depth_stencil) != 0;
if (haveFBO)
glGetIntegerv(GL_FRAMEBUFFER_BINDING_EXT, &oldFramebufferID);
return haveFBO;
}
bool FrameBufferObjectExt::Initialize(Dimensions dims)
{
bool haveFBO = OPENCSG_HAS_EXT(EXT_framebuffer_object) != 0
&& OPENCSG_HAS_EXT(EXT_packed_depth_stencil) != 0;
if (!haveFBO)
return false;
dimensions = dims;
glGenFramebuffersEXT(1, &framebufferID);
glGenRenderbuffersEXT(1, &depthID);
glGenTextures(1, &textureID);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, framebufferID);
GLenum target = GL_TEXTURE_2D;
if ( !OPENCSG_HAS_EXT(ARB_texture_non_power_of_two)
&& ( OPENCSG_HAS_EXT(ARB_texture_rectangle)
|| OPENCSG_HAS_EXT(EXT_texture_rectangle)
|| OPENCSG_HAS_EXT(NV_texture_rectangle)))
target = GL_TEXTURE_RECTANGLE_ARB;
glBindTexture(target, textureID);
glTexImage2D(target, 0, GL_RGBA8, GetWidth(), GetHeight(), 0, GL_RGBA, GL_INT, 0);
glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, target, textureID, 0);
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, depthID);
glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_STENCIL_EXT, GetWidth(), GetHeight());
glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, depthID);
glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, depthID);
GLenum status;
status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
if (status == GL_FRAMEBUFFER_UNSUPPORTED_EXT) {
Reset();
return false;
}
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, oldFramebufferID);
glBindTexture(target, 0);
textureTarget = target;
initialized = true;
return true;
}
// Releases frame buffer objects
bool FrameBufferObjectExt::Reset()
{
if (textureID) {
glDeleteTextures(1, &textureID);
textureID = 0;
}
if (depthID) {
glDeleteRenderbuffersEXT(1, &depthID);
depthID = 0;
}
if (framebufferID) {
glDeleteFramebuffersEXT(1, &framebufferID);
framebufferID = 0;
}
dimensions = Dimensions();
initialized = false;
return true;
}
// If new requested size differs, regenerate FBO texture objects
bool FrameBufferObjectExt::Resize(Dimensions dims)
{
if (dimensions == dims) {
return true;
}
Reset();
return Initialize(dims);
}
// Binds the created frame buffer texture such we can render into it.
bool FrameBufferObjectExt::BeginCapture()
{
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, framebufferID);
return true;
}
// Unbinds frame buffer texture.
bool FrameBufferObjectExt::EndCapture()
{
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, oldFramebufferID);
return true;
}
// Sets the frame buffer texture as active texture object.
void FrameBufferObjectExt::Bind() const
{
glBindTexture(textureTarget, textureID);
}
} // namespace OpenGL
} // namespace OpenCSG