4D Volume Rendering - Nvidia

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PBO Implementation- DrawDraw – app->pbo & pbo->tex transferm_curTimeStep ++;m_curTimeStep %= m_p<strong>Volume</strong>.size();static unsigned int curPBO = 0;glBindTexture(GL_TEXTURE_3D,texId);glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB, m_nPBOIds[curPBO]); //bind pbo//Copy pixels from pbo to texture objectglTexSubImage3D(GL_TEXTURE_3D,0,0,0,0,xdim,ydim,zdim,GL_LUMINANCE,GL_UNSIGNED_BYTE,0);PBO to Texture//bind next pbo for app->pbo transferglBindBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB, m_nPBOIds[1-curPBO]); //bind pbo//to prevent sync issue in case GPU is till working with the dataglBufferDataARB(GL_PIXEL_UNPACK_BUFFER_ARB, xdim*ydim*zdim*sizeof(GLubyte), 0, GL_STREAM_DRAW_ARB);GLubyte* ptr = (GLubyte*)glMapBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB, GL_WRITE_ONLY_ARB);assert(ptr);memcpy(ptr,m_p<strong>Volume</strong>[m_curTimeStep],m_w*m_h*m_d);glUnmapBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB);App to PBOglBindBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB,0);curPBO = 1-curPBO;//TODO – Call drawing code here
GPU Asynchronous• Drawback of PBO’s – GPU blocks, data downloadsame thread as draw• Fermi architecture - Copy Engine (CE) trulyasynchronous downloads• Quadro cards will have 2 CE’s - overlap compute,download, readback• Apps have a separate download/upload thread• Driver manages synchronization and scheduling
Page 1 and 2: 4D Volume RenderingShalini Venkatar
Page 3 and 4: Outline• Volume rendering techniq
Page 5 and 6: Transfer function lookupTexture 1//
Page 7: CUDA RaycastingInitdim3 m_blockSize
Page 10 and 11: Multi-pass raycasting - OpenGLFBOFr
Page 12 and 13: Pass 2- Draw on-screen quadInvoke r
Page 14 and 15: 4D - Caching all time steps• When
Page 16 and 17: Texture Streaming• When graphics
Page 18 and 19: CPU Asynchronous streaming• Non C
Page 22 and 23: GPU Async - ImplementationMain draw
Page 24 and 25: Multi-GPU Distributed RenderingSort
Page 26 and 27: Stereo in Volume Rendering• Provi
Page 28: Demo and Q&Ashaliniv@nvidia.comSeis

4D Volume Rendering - Nvidia

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