@ -3,6 +3,7 @@
# include <osg/FrameBufferObject>
# include <osg/GLExtensions>
# include <osg/Texture2D>
# include <osg/Texture2DMultisample>
# include <osg/Texture2DArray>
# include <osgUtil/RenderStage>
# include <osgUtil/CullVisitor>
@ -337,6 +338,133 @@ namespace Stereo
# endif
}
void setMultiviewMatrices ( osg : : StateSet * stateset , const std : : array < osg : : Matrix , 2 > & projection , bool createInverseMatrices )
{
auto * projUniform = stateset - > getUniform ( " projectionMatrixMultiView " ) ;
if ( ! projUniform )
{
projUniform = new osg : : Uniform ( osg : : Uniform : : FLOAT_MAT4 , " projectionMatrixMultiView " , 2 ) ;
stateset - > addUniform ( projUniform , osg : : StateAttribute : : ON | osg : : StateAttribute : : OVERRIDE ) ;
}
projUniform - > setElement ( 0 , projection [ 0 ] ) ;
projUniform - > setElement ( 1 , projection [ 1 ] ) ;
if ( createInverseMatrices )
{
auto * invUniform = stateset - > getUniform ( " invProjectionMatrixMultiView " ) ;
if ( ! invUniform )
{
invUniform = new osg : : Uniform ( osg : : Uniform : : FLOAT_MAT4 , " invProjectionMatrixMultiView " , 2 ) ;
stateset - > addUniform ( invUniform , osg : : StateAttribute : : ON | osg : : StateAttribute : : OVERRIDE ) ;
}
invUniform - > setElement ( 0 , osg : : Matrix : : inverse ( projection [ 0 ] ) ) ;
invUniform - > setElement ( 1 , osg : : Matrix : : inverse ( projection [ 1 ] ) ) ;
}
}
void setMultiviewCompatibleTextureSize ( osg : : Texture * tex , int w , int h )
{
switch ( tex - > getTextureTarget ( ) )
{
case GL_TEXTURE_2D :
static_cast < osg : : Texture2D * > ( tex ) - > setTextureSize ( w , h ) ;
break ;
case GL_TEXTURE_2D_ARRAY :
static_cast < osg : : Texture2DArray * > ( tex ) - > setTextureSize ( w , h , 2 ) ;
break ;
case GL_TEXTURE_2D_MULTISAMPLE :
static_cast < osg : : Texture2DMultisample * > ( tex ) - > setTextureSize ( w , h ) ;
break ;
# ifdef OSG_HAS_MULTIVIEW
case GL_TEXTURE_2D_MULTISAMPLE_ARRAY :
static_cast < osg : : Texture2DMultisampleArray * > ( tex ) - > setTextureSize ( w , h , 2 ) ;
break ;
# endif
default :
throw std : : logic_error ( " Invalid texture type received " ) ;
}
}
osg : : ref_ptr < osg : : Texture > createMultiviewCompatibleTexture ( int width , int height , int samples )
{
# ifdef OSG_HAS_MULTIVIEW
if ( Stereo : : getMultiview ( ) )
{
if ( samples > 1 )
{
auto tex = new osg : : Texture2DMultisampleArray ( ) ;
tex - > setTextureSize ( width , height , 2 ) ;
tex - > setNumSamples ( samples ) ;
return tex ;
}
else
{
auto tex = new osg : : Texture2DArray ( ) ;
tex - > setTextureSize ( width , height , 2 ) ;
return tex ;
}
}
else
# endif
{
if ( samples > 1 )
{
auto tex = new osg : : Texture2DMultisample ( ) ;
tex - > setTextureSize ( width , height ) ;
tex - > setNumSamples ( samples ) ;
return tex ;
}
else
{
auto tex = new osg : : Texture2D ( ) ;
tex - > setTextureSize ( width , height ) ;
return tex ;
}
}
}
osg : : FrameBufferAttachment createMultiviewCompatibleAttachment ( osg : : Texture * tex )
{
switch ( tex - > getTextureTarget ( ) )
{
case GL_TEXTURE_2D :
{
auto * tex2d = static_cast < osg : : Texture2D * > ( tex ) ;
return osg : : FrameBufferAttachment ( tex2d ) ;
}
case GL_TEXTURE_2D_MULTISAMPLE :
{
auto * tex2dMsaa = static_cast < osg : : Texture2DMultisample * > ( tex ) ;
return osg : : FrameBufferAttachment ( tex2dMsaa ) ;
}
# ifdef OSG_HAS_MULTIVIEW
case GL_TEXTURE_2D_ARRAY :
{
auto * tex2dArray = static_cast < osg : : Texture2DArray * > ( tex ) ;
return osg : : FrameBufferAttachment ( tex2dArray , osg : : Camera : : FACE_CONTROLLED_BY_MULTIVIEW_SHADER , 0 ) ;
}
case GL_TEXTURE_2D_MULTISAMPLE_ARRAY :
{
auto * tex2dMsaaArray = static_cast < osg : : Texture2DMultisampleArray * > ( tex ) ;
return osg : : FrameBufferAttachment ( tex2dMsaaArray , osg : : Camera : : FACE_CONTROLLED_BY_MULTIVIEW_SHADER , 0 ) ;
}
# endif
default :
throw std : : logic_error ( " Invalid texture type received " ) ;
}
}
unsigned int osgFaceControlledByMultiviewShader ( )
{
# ifdef OSG_HAS_MULTIVIEW
return osg : : Camera : : FACE_CONTROLLED_BY_MULTIVIEW_SHADER ;
# else
return 0 ;
# endif
}
class UpdateRenderStagesCallback : public SceneUtil : : NodeCallback < UpdateRenderStagesCallback , osg : : Node * , osgUtil : : CullVisitor * >
{
public :
@ -558,4 +686,111 @@ namespace Stereo
textureArray - > setWrap ( osg : : Texture : : WRAP_R , osg : : Texture : : CLAMP_TO_EDGE ) ;
return textureArray ;
}
osg : : FrameBufferAttachment makeSingleLayerAttachmentFromMultilayerAttachment ( osg : : FrameBufferAttachment attachment , int layer )
{
osg : : Texture * tex = attachment . getTexture ( ) ;
if ( tex - > getTextureTarget ( ) = = GL_TEXTURE_2D_ARRAY )
return osg : : FrameBufferAttachment ( static_cast < osg : : Texture2DArray * > ( tex ) , layer , 0 ) ;
# ifdef OSG_HAS_MULTIVIEW
if ( tex - > getTextureTarget ( ) = = GL_TEXTURE_2D_MULTISAMPLE_ARRAY )
return osg : : FrameBufferAttachment ( static_cast < osg : : Texture2DMultisampleArray * > ( tex ) , layer , 0 ) ;
# endif
Log ( Debug : : Error ) < < " Attempted to extract a layer from an unlayered texture " ;
return osg : : FrameBufferAttachment ( ) ;
}
MultiviewFramebufferResolve : : MultiviewFramebufferResolve ( osg : : FrameBufferObject * msaaFbo , osg : : FrameBufferObject * resolveFbo , GLbitfield blitMask )
: mResolveFbo ( resolveFbo )
, mMsaaFbo ( msaaFbo )
, mBlitMask ( blitMask )
{
}
void MultiviewFramebufferResolve : : resolveImplementation ( osg : : State & state )
{
if ( mDirtyLayers )
setupLayers ( ) ;
osg : : GLExtensions * ext = state . get < osg : : GLExtensions > ( ) ;
for ( int view : { 0 , 1 } )
{
mResolveLayers [ view ] - > apply ( state , osg : : FrameBufferObject : : BindTarget : : DRAW_FRAMEBUFFER ) ;
mMsaaLayers [ view ] - > apply ( state , osg : : FrameBufferObject : : BindTarget : : READ_FRAMEBUFFER ) ;
ext - > glBlitFramebuffer ( 0 , 0 , mWidth , mHeight , 0 , 0 , mWidth , mHeight , GL_DEPTH_BUFFER_BIT , GL_NEAREST ) ;
}
}
void MultiviewFramebufferResolve : : setupLayers ( )
{
mDirtyLayers = false ;
std : : vector < osg : : FrameBufferObject : : BufferComponent > components ;
if ( mBlitMask & GL_DEPTH_BUFFER_BIT )
components . push_back ( osg : : FrameBufferObject : : BufferComponent : : PACKED_DEPTH_STENCIL_BUFFER ) ;
if ( mBlitMask & GL_COLOR_BUFFER_BIT )
components . push_back ( osg : : FrameBufferObject : : BufferComponent : : COLOR_BUFFER ) ;
mMsaaLayers = { new osg : : FrameBufferObject , new osg : : FrameBufferObject } ;
mResolveLayers = { new osg : : FrameBufferObject , new osg : : FrameBufferObject } ;
for ( auto component : components )
{
const auto & msaaAttachment = mMsaaFbo - > getAttachment ( component ) ;
mMsaaLayers [ 0 ] - > setAttachment ( component , makeSingleLayerAttachmentFromMultilayerAttachment ( msaaAttachment , 0 ) ) ;
mMsaaLayers [ 1 ] - > setAttachment ( component , makeSingleLayerAttachmentFromMultilayerAttachment ( msaaAttachment , 1 ) ) ;
const auto & resolveAttachment = mResolveFbo - > getAttachment ( component ) ;
mResolveLayers [ 0 ] - > setAttachment ( component , makeSingleLayerAttachmentFromMultilayerAttachment ( resolveAttachment , 0 ) ) ;
mResolveLayers [ 1 ] - > setAttachment ( component , makeSingleLayerAttachmentFromMultilayerAttachment ( resolveAttachment , 1 ) ) ;
mWidth = msaaAttachment . getTexture ( ) - > getTextureWidth ( ) ;
mHeight = msaaAttachment . getTexture ( ) - > getTextureHeight ( ) ;
}
}
# ifdef OSG_HAS_MULTIVIEW
namespace
{
struct MultiviewFrustumCallback final : public osg : : CullSettings : : InitialFrustumCallback
{
MultiviewFrustumCallback ( Stereo : : InitialFrustumCallback * ifc )
: mIfc ( ifc )
{
}
void setInitialFrustum ( osg : : CullStack & cullStack , osg : : Polytope & frustum ) const override
{
bool nearCulling = false ;
bool farCulling = false ;
osg : : BoundingBoxd bb ;
mIfc - > setInitialFrustum ( cullStack , bb , nearCulling , farCulling ) ;
frustum . setToBoundingBox ( bb , nearCulling , farCulling ) ;
}
Stereo : : InitialFrustumCallback * mIfc ;
} ;
}
# endif
InitialFrustumCallback : : InitialFrustumCallback ( osg : : Camera * camera )
: mCamera ( camera )
{
# ifdef OSG_HAS_MULTIVIEW
camera - > setInitialFrustumCallback ( new MultiviewFrustumCallback ( this ) ) ;
# endif
}
InitialFrustumCallback : : ~ InitialFrustumCallback ( )
{
# ifdef OSG_HAS_MULTIVIEW
osg : : ref_ptr < osg : : Camera > camera ;
if ( mCamera . lock ( camera ) )
camera - > setInitialFrustumCallback ( nullptr ) ;
# endif
}
}
Mads Buvik Sandvei
3 years ago