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

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Intel® HD Graphics DirectX* Developer's Guide 2.1.3 Analyzing the terrain render frame Having completed optimization of the first scene, I switched to analyzing the landscape rendering. As shown in Figure , the game renderer spent most of its time in landscape rendering (54%), so I took a closer view of the terrain/landscape rendering system by using a separate application (RoF Editor*) which only rendered the landscape. Post Processing Effects, 40% Shadows, 2% Model, 4% Figure 7 Test Frame Time Distribution Diagram Landscape, 54% For test purposes, I chose the slowest possible scene, which occurs when the viewpoint is selected such that all objects in the landscape are rendered. The frame rate for this viewpoint dropped to ~40 FPS (compared to a viewpoint 400 feet above the ground, where the frame rate increased to ~100 FPS). 52 Document Number: 321371-002US
Appendix: Enhancing Graphics Performance on Intel® Processor Graphics with Intel® GPA Figure 8 Close-up View of Landscape (~40 FPS) The peak GPU time occurred when rendering trees in frames 215 - 219 (~ 6.4 ms). Terrain rendering occurred in frames 40 - 44 (~ 1.2 ms) Grass rendering occurred in frames 290 - 316 (~ 3.2 ms) Rise of Flight‟s forest rendering process was quite complex and required considerable CPU and GPU resources. The size of a forest “chunk” is 667 by 667 feet, and the rendering engine culled non-visible chunks from the forest map database. Although these trees are invisible to the viewer, they are still rendered at a high level of detail. To optimize tree rendering, I rewrote the shader to use dynamic branching within PS 3.0 to utilize a high-detail forest mask. As a result I improved tree rendering times ~50%, increasing the frame rate for the terrain render test case from 41 to 62 FPS. Grass rendering was the final area highlighted as being slow by Intel® GPA. Since this is an optional feature, the user can choose to lower the quality of grass rendering or turn it off completely. How to maximize graphics performance on Intel® Integrated Graphics 53
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Intel HD Graphics DirectX Developer's Guide (Sandy Bridge)

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