i GPU GPU GPU GPU CPU Radeon X800 Pro 3.2 α
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- こうざぶろう あみおか
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1 GPU
2 i GPU GPU GPU GPU CPU Radeon X800 Pro 3.2 α
3 Studies on the Speedup of Volume Rendering with Commodity GPUs Abstract ii Yuki SHINOMOTO A slice-order texture-based algorithm for volume rendering with commmodity GPUs loses spacial locality of reference and suffers from low cache hit ratio at some viewpoints. This is because the access pattern of volume references depends on the position of the viewpoint. A cuboid-order ray-casting algorithm which maximizes spatial locality of reference has been proposed. The cuboid-order algorithm divides the volume into sub volumes named cuboid, and controls the access pattern by rendering each cuboid. Maximization is achieved by detecting and sampling points in a cuboid fetched into the cache memory, before the cache lines composing the cuboid are replaced. In this paper we propose a cuboid-order texture-based algorithm based on the cuboid-order ray-casting algorithm. CPUs cannot control the access pattern as easily as CPUs. Our algorithm controls the aceess pattern by dividing the slice into smaller slices and arranges them in the cuboid-order when rendering each cuboid. The number of slices increases in proportion to the number of cuboids. We evaluate our algorithm with Radeon X800 Pro. The result shows that performance of the cuboid-order algorithm is lower than that of the slice-order when the size of cuboids are smaller than that of texture-cache and 3.2 times higer at some size of cuboids. The performance of the cuboid-order algorithm suffers from the cost of processing vertices of slices and changing cuboids which are processed. In this paper we proposed the address transformation of the volume and blending with the fragment prosessor of the GPU. The former reduces the cost of chaing cuboids and the latter reduces the number of vertices.
4 GPU Volume Rendering GPU GPU GPU GPU GPU Texture Based Volume Rendering
5 GPU
6 1 3 2 / [1] / 4K 3 [2] [3] 6.5TFLOPS 64GB GPU GPU GPU GPU GPU GPU 1
7 CPU CPU [4, 5] DRAM CPU GPU GPU GPU CPU GPU 2 GPU
8 2 GPU 2.1 Volume Rendering 3, 2,. 2.,., 3,,.,, CPU GPU PC B Ray A I(A, B) Volume 1: 3 3
9 1 1 1 A B I(A, B) I(A, B) = B A g(s)e s A τ(x)dx ds (1) s, x g τ g p g(p) p 1 g 2 g 1 I(A, B) = B i=a g(s i )e s j j=a τ(x j) (2) ,,, ( 2). 4
10 (front to back), (back to front). back to front,, v 0, v 1,, v n, RGB( ) c k α k v k ( ), C C = n i=0 i 1 α(v i )c(v i ) (1 α(v j )) (3). C k. j=0 C k 1 = α(v k 1 )c(v k 1 ) + (1 α(v k 1 ))C k (4) C = C 0. (2), RGB α. α RGB, α, RGB. 2: 2.2 GPU GPU GPU 3 5
11 GPU GPU GPU NVIDIA GeForce ATI Radeon Matrox Parhelia GPU GPU (Vertex Processor) RGBα (Triangle Setup Engine) 3 (rasterizer) GPU (Fragment Processor) (texture unit) (Texture) 1 6
12 (Texture Cache) 2 GPU[6] CPU CPU (Pixel Unit) (Raster Unit) α (Frame Buffer) RAMDAC (Random Access Memory Digital-to-Analog Converter) (Video Memory) GDDR GDDR DRAM GPU GPU 512MB
13 GPU 3 GPU Matrices,light positions,blend factors, and other uniform parameters GPU/ application Programabble Vertex Processor Primitive Assenmbly Rasterization & Interpretation Programabble Fragment Proceddor Frame-Buffer Tests & Blending Vertex Indeces Textures Frame Buffer data Flows:Primitive,Vertex,and Fragment Data Uniform Parameters-Change infrequently 3: CPU GPU / CPU GPU GPU CPU CPU CPU 3 RGBα α GPU GPU API API (Graphics API) CPU GPU API GPU API Windows 8
14 DirectX[7] OS OpenGL[8] API GPU OpenGL glcolor3f(1.0, 1.0, 1.0); glbegin(gl_quads); glvertex3f(-1.0, -1.0, 0.0); glvertex3f( 1.0, -1.0, 0.0); glvertex3f( 1.0, 1.0, 0.0); glvertex3f( -1.0, 1.0, 0.0); glend(); API GPU 2 CPU-GPU GPU API Cg (C for Graphics) HLSL (High Level Shader Language), GLSL 9
15 (OpenGL Shading Language) GPU NVIDIA microsoft OpenGL ARB CPU API GPU GPU GPU RGBα 1 1 RGBα RRRR BGG - GPU GPU 2 GPU RGBα 10
16 2.2.6 GPU GPU API DirectX DirectX 7 GPU CG,Hardware T&L (Hardware Transformation and Lighting) DirectX 8 GPU CG 2 (vertex program) (fragment program) DirectX 9 GPU DirectX 9c GPU GPU GPU GPU GPU GPU GPGPU (General-Purpose computation on GPUs) [9] 11
17 2.3 Texture Based Volume Rendering GPU [10, 11] , α CPU GPU API, α ( 4)., GPU [12]. 4: 12
18 GPU GPU 3 3 ( 5). CPU GPU API 3 5: 3 GPU 3 2 2D GPU Z Z Z 13
19 1 1 GPU CPU CPU GPU GPU GPU 6 GPU ( 6) 14
20 6: [0,0, 1.0] (0.5, 0.5, 0.5) [0, 1] GPU Z 15
21 (-50.0, 50.0) (50.0, 50.0) (0.0,1.0) (1.0,1.0) (-50.0, -50.0) (50.0, -50.0) (0.0,0.0) (0.0,1.0) 7: Z RGBα GPU CPU 3 GPU GPU GPU GPU GPU Dependent Texture ( ) [13] 2 3 RGBα 1 16
22 ( 8) R G 0 64 B A : GPU 17
23 α /8 GPU CPU RC [4] GPU α CPU GPU 18
24 2 3 CG 2 GPU 2.4 CPU [14, 15] ( 9) 1 1 DRAM [5] 19
25 : CPU GPU [4] Itanium FPS 4 Radeon X800 Pro FPS Radeon X800 Pro Itanium GPU CPU View GPU GPU GPU GPU 4 1/8 CPU 20
26 21
27 3 GPU (Cuboid: ) GPU GPU CPU CPU 22
28 GPU GPU CPU 4 GPU GPU 3.1 GPU GPU CPU GPU 2 2 GPU CPU ID 23
29 CPU ID GPU ID 3.2 GPU CPU 2 CPU CPU API GPU x, y, z int x, y, z; void loop_x(void){ for(x = 0; x < cx; ++x) loop_y(); for(x = X_MAX; x > cx; --x) loop_y(); x = cx; loop_y(); } X MAX x cx x x 10 2 cy cy > 3 loop x x loop x x < cx, x > cx, x = cx 3 x < cx 0 cx - 1 0, 1, 2,, cx
30 x y # :cuboid 10: x > cx X MAX cx + 1 x = cx 0, 1, 3, 2 loop y y 0, 1, 2, 3 cx > X MAX cx < 0 loop y() , 1-2, x, y xy y yx x , 2-1,, xy 25
31 3.3 GPU 11: ( 12) 26
32 GPU 6 8 GPU :
33 CPU ( 13) 13: 28
34 n 3 O(n 2 ) n 3 n 2 n 3 29
35 ( 14) GPU 1 2 [9] GPU 3/4 GPU 1/2 14: 30
36 3.6 3 GPU GPU n 3 n 2 31
37 4 2 2 GPU CPU Intel Pentium 4 2.5GHZ GPU ATI Radeon X800 Pro Linux C, OpenGL 1.5 Cg (C for graphics) Radeon X800 Pro 1 1: Radeon X800 Pro 475 MHz 28.8 GB/sec. 5.7 GPixels/sec MTriangles Memory 256 MB Memory Interface (bit) 256 Memory Data Rate 900MHz Pixels per Clock (peak) 12 32
38 4.2 1 GPU , (128MB) 8 3 (512Byte) ALPHA 8 1Byte α 2 α RGBα X Y (FPS) Radeon X800 Pro 4KB 512Byte 33
39 FPS angle 15: (X ) FPS angle 16: (Y ) 34
40 CPU DRAM DRAM GPU DRAM Byte X (FPS) 3 n O(n 2 ) 2 O(1/n 2 ) FPS FPS FPS 1/ 2 35
41 2: FPS n O(n 3 ) 32 3 FPS (512/ 1 ) 3 X Y
42 8 3 GPU FPS angle 17: (X ) FPS angle 18: (Y ) 37
43 FPS FPS FPS FPS 5.9FPS GPU 64 3 = 262, 144 API GPU , FPS FPS 13.9FPS 10.5FPS
44 F P S Vertices 0 3 3: ,022,451 2,373,427 3,231,744 4,109,107 4,207,411 3,145, MVertices 1 1/
45 GPU 3 2 GPU n 3 n 3/2 n 3/ GPU [16] 3D 1D 1D 2D 3D 2D 1 2 Cg float2 addrtranslation_1dto2d( float address1d, float2 texsize ) { // float2 CONV_CONST = float2( 1.0 / texsize.x, 1.0 / (texsize.x * texsize.y )); float2 normaddr2d = address1d * CONV_CONST; 40
46 float2 address2d = float2( frac(normaddr2d.x), normaddr2d,y ); return address2d; } frac(normaddr2d.x) normaddr2d.x texsize 2 address1d Cg float2 addrtranslation_3dto2d(float3 address3d, float3 sizetex3d, float2 sizetex2d) { // float3 SIZE_CONST = float3(1.0, sizetex3d.x, sizetex3d.y * sizetex3d.x); float address1d = dot( address3d, SIZE_CONST); return addrtranslation_1dto2d( address1d, sizetex2d); } dot(address3d, SIZEl CONST) address3d SIZE CONST 3D 1D GPU D ( 19) 3 GPU [5] 41
47 : [0:1.0] GPU α 2 α α 42
48 Cg lerp() α α α GPU GPU GPU GPU GPU [17] GPU RC 43
49 GPU GPU 5.3 GPU GPU GPU GPU CPU GPU GPU CPU GPU CPU GPU CPU [13] CPU GPU CPU GPU CPU GPU GPU GPU CPU API GPU 44
50 6 GPU 3 1 α GPU GPU GPU GPU GPU 45
51 46
52 [1] Lichtenbelt, B., Crane, R. and Naqvi, S.: Introduction To Volume Rendering, Hewlett-Packard (1998). [2], : X TV SHIN- MAVISION ELNOS, Medical Now, Vol. 44, pp (2000). [3], : SHD - -, (SPWS-TMWG) 005 (1999). [4],,,, :,, Vol. 44, No. SIG 11(ACS 3), pp (2003). [5],,,, :,, Vol. 45, No. SIG 11(ACS 7), pp (2004). [6] Montrym, J. and Moreton, H.: The GeForce 6800, IEEE Micro, Vol. 25, No. 2, pp (2005). [7] DirectX: [8] OpenGL: [9] GPGPU: [10] Muraki, S., Lum, E. B., Ma, K.-L., Ogata, M. and Liu, X.: A PC Cluster System for Simultaneous Interactive Volumetric Modeling and Visualization, IEEE Symposium on Parallel and Large-Data Visualization and Graphics, pp (2003). [11],, : PC, CVIMl (2001). [12] Rezk-Salama, C., K. Engel, M. B., Greiner, G. and Ertl, T.: Interactive Volume Rendering on Standard PC Graphics Hardware Using Multi-Texturesand Multi-Stage Rasterization, Proceedings of Eurograph- 47
53 ics/siggraph Workshop on Graphics Hardware (2000). [13],,,,, :, 2005 ARC 164 (SWoPP 2005), pp (2005). [14] Wolfe, M.: More Iteration Space Tiling, Proceedings of Supercomputing (SC 89), pp (1989). [15] Lam, M. S., Tothberg, E. E. and Wolf, M. E.: The Cache Performance and Optimizations of Blocked Algorithms, In Fourth International Conference on Architectural Support for Programming Languages and Operating Systems, pp (1991). [16] Pharr, M. and Fernando, R.(eds.): GPU Gems 2: Programming Techniques For High-Performance Graphics And General-Purpose Computation, Addison-Wesley Pub (2005). [17] Stegmaier, S., Strengert, M., Klein, T. and Ertl, T.: A Simple and Flexible Volume Rendering Framework for Graphics-Hardware-based Raycasting, Proceedings of Eurographics/IEEE VGTC Workshop on Volume Graphics 2005, pp (2005). 48
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