Intel HD Graphics DirectX Developer's Guide (Sandy Bridge)

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Figure 3 Intel® GPA System Analyzer Intel® HD Graphics DirectX* Developer's Guide In Intel GPA Frame Analyzer (Figure ), the “ERG Visualization Panel” in the top half of the window showed what portions of the frame used the most GPU time. I then selected the set of graphics primitives shown in Figure (highlighted in yellow), which corresponded to the drawing of the plane‟s fuselage. This tool also indicated that the drawing time for the fuselage was ~215 milliseconds (ms), which was a longer rendering time than I expected. 48 Document Number: 321371-002US
Appendix: Enhancing Graphics Performance on Intel® Processor Graphics with Intel® GPA Figure 4 API Calls Before Optimization. Overall Rendering Time ~215ms To get a better picture of exactly what was happening, I used the API Log tab within the tool to examine the sequence of DirectX* API calls for these primitives. Also, when running Intel® GPA System Analyzer I saw that the state changes (DX State, DX State Captures, DX State Applies, and Render State) per frame were unreasonably high, so I decided to start my optimization efforts with the rendering of the fuselage. The first optimization step was to reduce the time spent saving and restoring the state information. 777 Studio wrote our own state manager (ID3DXEffectStateManager), which allowed us to minimize state changes. After implementing the new state manager, the API Log showed significantly fewer API calls and state changes. The new result was the frame rate increased from 41 FPS to 56 FPS, an improvement of ~37%. Next, I performed additional pruning of the Render State changes used by effects such as bloom and high dynamic range rendering (HDR). The bottom line is that I was able to achieve 69 FPS, an overall improvement of ~60% from when I first started analyzing the frame within Intel GPA Frame Analyzer (Figure ). How to maximize graphics performance on Intel® Integrated Graphics 49
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