Real-time Rendering with Multiprocessing: A Deep Dive into Graphics Pipelines and OpenGL -, Study notes of Electrical and Electronics Engineering

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Kerey Howard EEL 6897

Multiprocessor Graphic

Rendering

Lecture Outline Real time Rendering Introduction Graphics API Pipeline Multiprocessing Parallel Processing Threading OpenGL with Java

Illustration: FSX Screen Capture

Illustration: Halflife 2 ep2 Screen Capture

Graphics API OpenGL Open Graphics Library http://www.opengl.org/ Native Multi OS support Hardware Accelerated GLSL Shader Language Direct 3D Part of the Microsoft Direct X API package http://www.microsoft.com/directx Windows support only (DirectX 10 only on Vista) Hardware Accelerated HLSL Shader Language

Pipeline Render Pipeline Slowest Stage determines Rendering Speed (fps) Application Stage Input Control Collision Detection Geometry Stage Model & View Transform Lighting Projection Clipping Screen Mapping Rasterizer Stage Assign Colors to all pixels Anti-Aliasing, Z-buffer,and other filtering

Illustration: Multiple Processor Utilization

Multiprocessing Temporal Parallelism Requires Multiple Processing Cores No Hyperthreading Focus: Application Stage APP is the Control Advantages: Implementation (Stages are already divided) Throughput is increased Higher Frame rate Disadvantages: Latency Increases Synchronization Penalty

Illustration: Threading approaches

Illustration: Threading approaches

Optimization Make it Run FIRST! Know the Architecture Find the Bottleneck (the slow stage) Optimize for Performance Reduce latency Increase Frame Rate Optimize for Quality Make use of stall time

Illustration: Balancing the pipeline APP^ GEOM^ RAST 10 ms 0 ms 20 ms 30 ms 40 ms 50 ms APP^ GEOM^ RAST 10 ms 0 ms 20 ms 30 ms 40 ms 50 ms balance