4D Volume Rendering - Nvidia

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CPU Asynchronous streaming• Non CPU-blocking transfer using Pixel BufferObjects (PBO)– Ping-pong PBO’s for optimal throughput– Data must be in GPU native formatDiskpData[nTimesteps][0][1][2]…Main Memoryhttp://developer.nvidia.com/object/nv_ogl_texture_formats.htmlT N+1 :memcpyPBO 0PBO 1OpenGL ControlledMemoryT N : glTexSubImage3DtexIDGraphics Memory
PBO ImplementationFrame DrawGPU Draw t0 Draw t1Draw t2BusCPUDownload t0 :PBO 0Download t1 :PBO 1Download t2 :PBO 0Copy t0 :PBO 0 Copy t1 :PBO 1 Copy t2 :PBO 0Init – allocate 2 PBO’s and1 texture objectglGenBuffersARB(2, m_nPBOIds); //Allocate 2 PBO’sglBindBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB, PBOIds[0]);glBufferDataARB(GL_PIXEL_UNPACK_BUFFER_ARB,width*height*depth*sizeof(GLubyte),0,GL_STREAM_DRAW_ARB);glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB, PBOIds[1]);glBufferDataARB(GL_PIXEL_UNPACK_BUFFER_ARB,width*height*depth*sizeof(GLubyte),0,GL_STREAM_DRAW_ARB);glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB, 0);//TODO – Same texture initialization from “texture streaming” sectiontimeUNPACK - for download to GPU
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 20 and 21: PBO Implementation- DrawDraw - app-
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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