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

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