From Marco Jez, added example that uses FBO extension to do prerendering.

2005-06-09 11:08:37 +00:00
parent 96eb0b71c6
commit 5c86ecebe4
12 changed files with 894 additions and 0 deletions
--- a/examples/osgfbo/FramebufferAttachment.cpp
+++ b/examples/osgfbo/FramebufferAttachment.cpp
@@ -0,0 +1,173 @@
+#include "FramebufferAttachment.h"
+#include "Renderbuffer.h"
+#include "FBOExtensions.h"
+#include <osg/Texture1D>
+#include <osg/Texture2D>
+#include <osg/Texture3D>
+#include <osg/TextureCubeMap>
+#include <osg/TextureRectangle>
+#include <osg/State>
+
+using namespace osg;
+
+#ifndef GL_TEXTURE_CUBE_MAP_POSITIVE_X
+#define GL_TEXTURE_CUBE_MAP_POSITIVE_X  0x8515
+#endif
+
+struct FramebufferAttachment::Pimpl
+{
+    enum TargetType
+    {
+        RENDERBUFFER,
+        TEXTURE1D,
+        TEXTURE2D,
+        TEXTURE3D,
+        TEXTURECUBE,
+        TEXTURERECT
+    };
+    
+    TargetType targetType;
+    ref_ptr<Renderbuffer> renderbufferTarget;
+    ref_ptr<Texture> textureTarget;
+    int cubeMapFace;
+    int level;
+    int zoffset;
+
+    explicit Pimpl(TargetType ttype = RENDERBUFFER, int lev = 0)
+    :    targetType(ttype),
+        cubeMapFace(0),
+        level(lev),
+        zoffset(0)
+    {
+    }
+
+    Pimpl(const Pimpl &copy)
+    :    targetType(copy.targetType),
+        renderbufferTarget(copy.renderbufferTarget),
+        textureTarget(copy.textureTarget),
+        cubeMapFace(copy.cubeMapFace),
+        level(copy.level),
+        zoffset(copy.zoffset)
+    {
+    }
+};
+
+FramebufferAttachment::FramebufferAttachment()
+{
+    _ximpl = new Pimpl;
+}
+
+FramebufferAttachment::FramebufferAttachment(const FramebufferAttachment &copy)
+{
+    _ximpl = new Pimpl(*copy._ximpl);
+}
+
+FramebufferAttachment::FramebufferAttachment(Renderbuffer* target)
+{
+    _ximpl = new Pimpl(Pimpl::RENDERBUFFER);
+    _ximpl->renderbufferTarget = target;
+}
+
+FramebufferAttachment::FramebufferAttachment(Texture1D* target, int level)
+{
+    _ximpl = new Pimpl(Pimpl::TEXTURE1D, level);
+    _ximpl->textureTarget = target;
+}
+
+FramebufferAttachment::FramebufferAttachment(Texture2D* target, int level)
+{
+    _ximpl = new Pimpl(Pimpl::TEXTURE2D, level);
+    _ximpl->textureTarget = target;
+}
+
+FramebufferAttachment::FramebufferAttachment(Texture3D* target, int level, int zoffset)
+{
+    _ximpl = new Pimpl(Pimpl::TEXTURE3D, level);
+    _ximpl->textureTarget = target;
+    _ximpl->zoffset = zoffset;
+}
+
+FramebufferAttachment::FramebufferAttachment(TextureCubeMap* target, int face, int level)
+{
+    _ximpl = new Pimpl(Pimpl::TEXTURECUBE, level);
+    _ximpl->textureTarget = target;
+    _ximpl->cubeMapFace = face;
+}
+
+FramebufferAttachment::FramebufferAttachment(TextureRectangle* target)
+{
+    _ximpl = new Pimpl(Pimpl::TEXTURERECT);
+    _ximpl->textureTarget = target;
+}
+
+FramebufferAttachment::~FramebufferAttachment()
+{
+    delete _ximpl;
+}
+
+FramebufferAttachment &FramebufferAttachment::operator = (const FramebufferAttachment &copy)
+{
+    delete _ximpl;
+    _ximpl = new Pimpl(*copy._ximpl);
+    return *this;
+}
+
+void FramebufferAttachment::attach(State &state, GLenum attachment_point, const FBOExtensions* ext) const
+{
+    unsigned int contextID = state.getContextID();
+
+    // force compile texture if necessary
+    Texture::TextureObject *tobj = 0;
+    if (_ximpl->textureTarget.valid())
+    {
+        tobj = _ximpl->textureTarget->getTextureObject(contextID);
+        if (!tobj || tobj->_id == 0)
+        {
+            _ximpl->textureTarget->compileGLObjects(state);
+            tobj = _ximpl->textureTarget->getTextureObject(contextID);
+        }
+        if (!tobj || tobj->_id == 0)
+            return;
+    }
+
+    switch (_ximpl->targetType)
+    {
+    default:
+    case Pimpl::RENDERBUFFER:
+        ext->glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, attachment_point, GL_RENDERBUFFER_EXT, _ximpl->renderbufferTarget->getObjectID(contextID, ext));
+        break;
+    case Pimpl::TEXTURE1D:
+        ext->glFramebufferTexture1DEXT(GL_FRAMEBUFFER_EXT, attachment_point, GL_TEXTURE_1D, tobj->_id, _ximpl->level);
+        break;
+    case Pimpl::TEXTURE2D:
+        ext->glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, attachment_point, GL_TEXTURE_2D, tobj->_id, _ximpl->level);
+        break;
+    case Pimpl::TEXTURE3D:
+        ext->glFramebufferTexture3DEXT(GL_FRAMEBUFFER_EXT, attachment_point, GL_TEXTURE_3D, tobj->_id, _ximpl->level, _ximpl->zoffset);
+        break;
+    case Pimpl::TEXTURERECT:
+        ext->glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, attachment_point, GL_TEXTURE_RECTANGLE, tobj->_id, 0);
+        break;
+    case Pimpl::TEXTURECUBE:
+        ext->glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, attachment_point, GL_TEXTURE_CUBE_MAP_POSITIVE_X + _ximpl->cubeMapFace, tobj->_id, _ximpl->level);
+        break;
+    }
+}
+
+int FramebufferAttachment::compare(const FramebufferAttachment &fa) const
+{
+    if (&fa == this) return 0;
+    if (_ximpl->targetType < fa._ximpl->targetType) return -1;
+    if (_ximpl->targetType > fa._ximpl->targetType) return 1;
+    if (_ximpl->renderbufferTarget.get() < fa._ximpl->renderbufferTarget.get()) return -1;
+    if (_ximpl->renderbufferTarget.get() > fa._ximpl->renderbufferTarget.get()) return 1;
+    if (_ximpl->textureTarget.get() < fa._ximpl->textureTarget.get()) return -1;
+    if (_ximpl->textureTarget.get() > fa._ximpl->textureTarget.get()) return 1;
+    if (_ximpl->cubeMapFace < fa._ximpl->cubeMapFace) return -1;
+    if (_ximpl->cubeMapFace > fa._ximpl->cubeMapFace) return 1;
+    if (_ximpl->level < fa._ximpl->level) return -1;
+    if (_ximpl->level > fa._ximpl->level) return 1;
+    if (_ximpl->zoffset < fa._ximpl->zoffset) return -1;
+    if (_ximpl->zoffset > fa._ximpl->zoffset) return 1;
+    return 0;
+}