void Fbo::init()
{
gl::SaveFramebufferBinding bindingSaver;
#if defined( CINDER_MSW )
static bool csaaSupported = ( GLEE_NV_framebuffer_multisample_coverage != 0 );
#else
static bool csaaSupported = false;
#endif
bool useCSAA = csaaSupported && ( mObj->mFormat.mCoverageSamples > mObj->mFormat.mSamples );
bool useMSAA = ( mObj->mFormat.mCoverageSamples > 0 ) || ( mObj->mFormat.mSamples > 0 );
if( useCSAA )
useMSAA = false;
// allocate the framebuffer itself
GL_SUFFIX(glGenFramebuffers)( 1, &mObj->mId );
GL_SUFFIX(glBindFramebuffer)( GL_SUFFIX(GL_FRAMEBUFFER_), mObj->mId );
Texture::Format textureFormat;
textureFormat.setTarget( getTarget() );
textureFormat.setInternalFormat( getFormat().getColorInternalFormat() );
textureFormat.setWrap( mObj->mFormat.mWrapS, mObj->mFormat.mWrapT );
textureFormat.setMinFilter( mObj->mFormat.mMinFilter );
textureFormat.setMagFilter( mObj->mFormat.mMagFilter );
textureFormat.enableMipmapping( getFormat().hasMipMapping() );
// allocate the color buffers
for( int c = 0; c < mObj->mFormat.mNumColorBuffers; ++c ) {
mObj->mColorTextures.push_back( Texture( mObj->mWidth, mObj->mHeight, textureFormat ) );
}
#if ! defined( CINDER_GLES )
if( mObj->mFormat.mNumColorBuffers == 0 ) { // no color
glDrawBuffer( GL_NONE );
glReadBuffer( GL_NONE );
}
#endif
if( ( ( ! useCSAA ) && ( ! useMSAA ) ) || ( ! initMultisample( useCSAA ) ) ) { // if we don't need any variety of multisampling or it failed to initialize
// attach all the textures to the framebuffer
vector<GLenum> drawBuffers;
for( size_t c = 0; c < mObj->mColorTextures.size(); ++c ) {
GL_SUFFIX(glFramebufferTexture2D)( GL_SUFFIX(GL_FRAMEBUFFER_), GL_SUFFIX(GL_COLOR_ATTACHMENT0_) + c, getTarget(), mObj->mColorTextures[c].getId(), 0 );
drawBuffers.push_back( GL_SUFFIX(GL_COLOR_ATTACHMENT0_) + c );
}
#if ! defined( CINDER_GLES )
if( ! drawBuffers.empty() )
glDrawBuffers( drawBuffers.size(), &drawBuffers[0] );
#endif
// allocate and attach depth texture
if( mObj->mFormat.mDepthBuffer ) {
if( mObj->mFormat.mDepthBufferAsTexture ) {
#if ! defined( CINDER_GLES )
GLuint depthTextureId;
glGenTextures( 1, &depthTextureId );
glBindTexture( getTarget(), depthTextureId );
glTexImage2D( getTarget(), 0, getFormat().getDepthInternalFormat(), mObj->mWidth, mObj->mHeight, 0, GL_DEPTH_COMPONENT, GL_FLOAT, NULL );
glTexParameteri( getTarget(), GL_TEXTURE_MIN_FILTER, mObj->mFormat.mMinFilter );
glTexParameteri( getTarget(), GL_TEXTURE_MAG_FILTER, mObj->mFormat.mMagFilter );
glTexParameteri( getTarget(), GL_TEXTURE_WRAP_S, mObj->mFormat.mWrapS );
glTexParameteri( getTarget(), GL_TEXTURE_WRAP_T, mObj->mFormat.mWrapT );
glTexParameteri( getTarget(), GL_DEPTH_TEXTURE_MODE, GL_LUMINANCE );
mObj->mDepthTexture = Texture( getTarget(), depthTextureId, mObj->mWidth, mObj->mHeight, true );
glFramebufferTexture2DEXT( GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, getTarget(), mObj->mDepthTexture.getId(), 0 );
//glFramebufferTexture2DEXT( GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT, getTarget(), mObj->mDepthTexture.getId(), 0 );
#else
throw; // this should never fire in OpenGL ES
#endif
}
else if( mObj->mFormat.mDepthBuffer ) { // implement depth buffer as RenderBuffer
mObj->mDepthRenderbuffer = Renderbuffer( mObj->mWidth, mObj->mHeight, mObj->mFormat.getDepthInternalFormat() );
GL_SUFFIX(glFramebufferRenderbuffer)( GL_SUFFIX(GL_FRAMEBUFFER_), GL_SUFFIX(GL_DEPTH_ATTACHMENT_), GL_SUFFIX(GL_RENDERBUFFER_), mObj->mDepthRenderbuffer.getId() );
}
}
FboExceptionInvalidSpecification exc;
if( ! checkStatus( &exc ) ) { // failed creation; throw
throw exc;
}
}
mObj->mNeedsResolve = false;
mObj->mNeedsMipmapUpdate = false;
}
