Graphics Hardware. Computer Graphics COMP 770 (236) Spring Instructor: Brandon Lloyd 2/26/07 1

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1 Graphics Hardware Computer Graphics COMP 770 (236) Spring 2007 Instructor: Brandon Lloyd 2/26/07 1

2 From last time Texture coordinates Uses of texture maps reflectance and other surface parameters lighting geometry Solid textures 2/26/07 2

3 Graphics from a system s perspective Graphics operations most frequently executed on a coprocessor called a Graphics Processing Unit (GPU) Dedicated buses between the host CPU and the GPU AGP, PCI Express Separate GPU memory Framebuffer, textures, etc. Shared memory with CPU 2/26/07 3

4 OpenGL Graphics Past Fixed-function graphics pipeline every step neatly planned PHILOSOPHY: Performance > Flexibility Extended by committee Why process anything other than polygons or the occasional pixel? A fragment is a potential Host Commands Vertex Transforms Cull, Clip & Project Process And Rasterize Primitive Fragment Processing Texture Memory Per- Fragment Operations Frame Buffer Operations Frame Buffer Display Pixel Pack & Unpack Read Back Control 2/26/07 4

5 OpenGL Graphics Today Programmable processing units Programmable vertex and fragment processors (Exposes what was always there beneath the covers) Texture memory general-purpose data storage Texture Memory Host Commands Vertex Vertex Processor Processor Cull, Clip & Project Process and Rasterize Primitive Fragment Fragment Processor Processor Per- Fragment Operation Frame Buffer Operation Frame Buffer Display Pixel Pack & Unpack Read Back Control 2/26/07 5

6 A GPU block diagram GeForce 6 Series Massive parallelism pipelining multiple data paths Mix of programmable and hardwired function blocks Simple inter-processor connectivity High-bandwidth memory interfaces 2/26/07 6

7 Vertex processor capabilities Lighting, Material and Geometry flexibility Vertex programs replace the following parts of the pipeline: Vertex & Normal transformation Normalization and rescaling Per-Vertex Lighting Calculations Color application Texture coordinate generation & transformation The vertex program does NOT replace: Perspective divide and viewport (NDC) mapping Clipping Backface culling Primitive assembly (Triangle setup, edge equations, etc.) 2/26/07 7

8 Vertex processor Inputs & Outputs Vertex shader is supplied with a number of parameters Vertex parameters, OpenGL state, user supplied parameters Results written into prearranged locations (registers) that are understood by later processing steps Standard OpenGL attributes glcolor, glnormal glvertex, glmultitexcoord User-Defined Attributes User-Defined Uniform Variables eyeposition, lightposition, modelscalefactor, etc. Vertex Processor Standard OpenGL State ModelViewMatrix, gllightsource[0,..n], glfogcolor, glfrontmaterial, etc. Standard OpenGL variables Vertex & texture coords, Vertex color User-Defined variables Model coordinates, Normals, hvector, toeyevector, etc 2/26/07 8

9 Fragment processor capabilities Flexibility for texturing and per-pixel operations Fragment programs replace the following parts of the OpenGL pipeline: Operations on interpolated values Pixel zoom Texture access Scale and bias Texture application (modulate, add) Color table lookup Fog (color, depth) Convolution Color sums (blends, mattes) Color matrix The Fragment shader does NOT replace: Scan Conversion Histogram Coverage Pixel packing and unpacking Scissor Stipple Alpha test Depth test Stencil test Alpha blending Logical ops Dithering Plane masking Z-buffer replacement test 2/26/07 9

10 Fragment processor Inputs & Outputs Fragment shader is supplied with a number of parameters fragment parameters, OpenGL state, user supplied parameters Results written into prearranged locations (registers) that are understood by later processing steps User-Defined Uniform Variables eyeposition, li:ghtposition, modelscalefactor, epsilon, etc. Standard Rasterizer attributes color (r, g, b, a), depth (z), texturecoordinates User-Defined Attributes Normals, modelcoord, density, etc Fragment Processor Standard OpenGL variables FragmentColor, FragmentDepth TextureMemory Textures, Tables, TempStorage 2/26/07 10

11 GPU Programmability The first Vertex and Fragment programs were written in low-level, H/Wspecific assembly languages specific capabilities (eg. floating point only in Vertex shaders, fixed-point only in Fragment shaders) Trend is toward Higher-Level languages GeForce 8800 has unified shaders (same capabilities for both Vertex and Fragment shaders) Application Vertex Processor Process and Rasterize Primitive Fragment Processor Per Fragment & Frame Buffer Ops Frame Buffer Application Program Vertex Shader Program Fragment Shader Program 2/26/07 11

12 Historical: GeForce 3 Vertex Processor In the beginning, resources were limited Difficult to do anything, even at the assembly level Useful macros for Vector-scalar mult Vector-vector add Dot-product Normalize became the programming method of choice Vector Floating Pt Datapath Vertex Attributes 16x4 registers Vertex Program 128 instrs Vertex Results 15x4 registers Uniform Parameters (don t change on each vertex) 96x4 registers Temp Registers 12x4 registers 2/26/07 12

13 GPU/CPU Differences Early GPUs offered no branching support Conditional operations instead If (rega < 0) regb = regc No general indirect access to memory (i.e. lookup tables, textures, etc.) Limited Arrays (uniform parameters) Fixed vector sizes (2, 3 & 4) Vector Floating Pt Datapath Vertex Attributes 16x4 registers Vertex Program 128 instrs Vertex Results 15x4 registers Uniform Parameters (don t change on each vertex) 96x4 registers Temp Registers 12x4 registers 2/26/07 13

14 Recent GPUs (GeForce 6) 512 total instructions 64K executed per primitive Independent execution (MIMD) Branching Subroutine calls Flexible per-vertex processing General purpose vector registers 4-element (x,y,z,w) Vertex Cache Texture accesses 2/26/07 14

15 Recent fragment processors 512 total instructions 64K executed per primitive Coupled execution (SIMD) Branching Subroutine calls Flexible per-fragment processing General purpose vector registers 4-element (r,g,b,a) Streamed Datapaths Texture accesses 2/26/07 15

16 Fragment unit performance 4 ops & 2 Units Same operation on all 4-args on 2 units Or 2-different ops on 2-args on 2 units per clock RGBA or RGBA 16-units per chip 128 = 16 x 8 ops per clock 2/26/07 16

17 Programming the Beast GPU Assembly Example: FRC R2.y, C11.w; ADD R3.x, C11.w, -R2.y; MOV H4.y, R2.y; ADD H4.x, -H4.y, C4.w; MUL R3.xy, R3.xyww, C11.xyww; ADD R3.xy, R3.xyww, C11.z; TEX H5, R3, TEX2, 2D; ADD R3.x, R3.x, C11.x; TEX H6, R3, TEX2, 2D; GPU programs were quirky and non-portable 2/26/07 17

18 High-level languages to the rescue Cg High-level language example: (Cg = C for graphics ) float4 main( { float2 detailcoords : TEXCOORD0, float2 bumpcoords: TEXCOORD1, float3 lightvector : COLOR0, uniform float3 ambientcolor, uniform sampler2d detailtexture : TEXUNIT0, uniform sampler2d bumptexture : TEXUNIT1): COLOR float3 detailcolor = tex2d(detailtexture, detailcoords).rgb; float3 lightvectorfinal = 2.0 * (lightvector.rgb - 0.5); float3 bumpnormalvectorfinal = 2.0 * (tex2d(bumptexture, bumpcoords).rgb - 0.5); float diffuse = dot(bumpnormalvectorfinal, lightvectorfinal); return float4(diffuse * detailcolor + ambientcolor, 1.0); } Easier to read and maintain (old-lesson relearned), but still quirky Symbolic named variables (allocated by compiler) Portability between implementations Reuse pieces 2/26/07 18

19 Explosion of GPU HLLs Stanford Shading Language Cg (Predecessor to Cg) C/Renderman-like Separate programming environment Compiled and linked into application GLSL (OpenGL Shading Language) Embedded into application and compiled on the fly HLSL - DirectX pixel-shading language Integrated into application programming environment 2/26/07 19

20 Shading language uses Lots of versatility Subsurface Scattering NPR Renders Fire Effects Refraction Ray Tracing Solid Textures Ambient Occlusion Cloth Simulation 2/26/07 20

21 HLLs are still hard to use All of the old problems associated with managing projects with multiple parts resurface Separate host program Separate Vertex program Separate Fragment program Multiple shaders per application Want incremental tweaks of shaders to propagate to successors Due to small program size must manage loading and running multipass shaders What s the solution? Smart syntax aware editors Project Managements scripts (Makefiles) Wrappers, Linking loaders, (OOP??) 2/26/07 21

22 Enter the GPU IDE 2/26/07 22

23 FX Composer & RenderMonkey Integrated Shader Development Environment Interactive Preview window-- lets you see the impact of your shader changes immediately Supports HLSL (RM also supports GLSL) Separate editor windows for vertex and fragment shading code Support generation of artwork (textures, color palettes, MIPmaps) Built-in host application that allows loading geometry Built-in disassembler Provides error checking and limited debugging Free download at 2/26/07 23

24 GPGPU General Processing on Graphics Processing Units (GPGPU) map more general computation to the GPU to take advantage of the massive amounts of raw processing power 2/26/07 24

25 Graphics hardware future GeForce 8800 unified shader architecture general scalar processors (integer and bitwise ops) 2/26/07 25

26 Graphics hardware future Convergence between CPUs and GPUs CPUs going multi-core many simpler, lower power cores GPUs becoming more and more programmable CUDA, PeakStream, etc. Massive multi-threading to hide latency Heterogeneous collection of processors Cell ATI Fusion More complex memory models less hardware caching more reliance on the programmer 2/26/07 26

27 Next time Programmable shaders 2/26/07 27

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