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

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Intel® HD Graphics DirectX* Developer's Guide Figure 13 Intel® GPA System Analyzer after Skipping the Clear Call in Low Fidelity Mode This supports the assumption that the GPU is still busy doing other work. The Intel® GPA Frame Analyzer also details shader activity within a sample set and a single frame. Returning to the Intel® GPA Frame Analyzer and looking at the shader activity during that frame as well as an analysis of the shader itself and the number of instructions executed by each, we found that a specific shader was consuming a lot of time on the GPU. The Intel® GPA Frame Analyzer offers the interesting “comment this out” functionality by overriding a shader to short circuit it and only does the work of outputting a single color – yellow. This will give us a visual indicator of what that shader does. Best of all, this can all be done without editing a file. Just change a setting in the Intel® GPA Frame Analyzer and the frame will be recomputed on-the-fly with the output applied by the test shader to render the same scene we saw before. The frame rate increase is a result of applying the simplified the Intel® GPA Frame Analyzer yellow shader. 60 Document Number: 321371-002US
Appendix: Enhancing Graphics Performance on Intel® Processor Graphics with Intel® GPA Figure 14 Same Scene with a High GPU Load Shader Outputting Yellow It looks like this particular shader is not significantly affecting the scene in Low Fidelity mode. Here is a pixel-by-pixel comparison of the key differences between this altered scene and the original. Looking at the code, it turns out that the shader applies a metallic feature to the structures in the scene, ignoring some differences in the lava‟s post-processing effects that will be explained later. How to maximize graphics performance on Intel® Integrated Graphics 61
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Intel HD Graphics DirectX Developer's Guide (Sandy Bridge)

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