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

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Intel® HD Graphics DirectX* Developer's Guide Figure 5 After Optimization of RenderState Changes and RenderTarget Changes 2.1.2 Using Intel® GPA Frame Analyzer After completing the analysis using Intel GPA System Analyzer, I ran Intel GPA Frame Analyzer on the test scene (Figure ). Key observations were: Ergs 69 – 71 highlight a GPU spike due to a slow pixel shader rendering for the surface terrain (~ 1 ms) Ergs 588 - 591 highlight another GPU spike due to the rendering of an aircraft model which has a complicated pixel shader (~ 0.4 ms) Ergs 670 - 728 highlight a third GPU spike due to the rendering of various optional effects such as bloom and HDR (~ 3.6 ms) 50 Document Number: 321371-002US
Appendix: Enhancing Graphics Performance on Intel® Processor Graphics with Intel® GPA Figure 6 Test Scene Rendering Times The rest of the GPU time is spent rendering the landscape (~ 3.7 ms) and dynamic depth-shadows (~0.2 ms) The “Shaders” tab of the Intel® GPA Frame Analyzer showed that the terrain pixel shader and the aircraft pixel shader used many instruction slots and textures, so I created a streamlined version of the pixel shader with reduced texture lookups and instruction slots. Similarly, the aircraft pixel shader also used many instruction slots. The shader was compiled with Pixel Shader (PS) 2.0, which does not support branching. By using PS 3.0, I was able to rewrite the shader and optimize it with static branching for multiple lighting. After these changes, I carefully analyzed the overall visual quality of the scene to ensure that the end result was still visually compelling. How to maximize graphics performance on Intel® Integrated Graphics 51
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