Yes, I am using selectivity as a proxy for impaction. SJSU publishes admission thresholds for frosh and transfer applicants by major. From this, we can see that impaction is greater for computer science than for history, for example. Or that animation is heavily impacted, but other art majors have enough space to admit applicants with baseline CSU eligibility.
http://www.sjsu.edu/admissions/impaction/
http://www.sjsu.edu/admissions/impaction/impactionresultsfreshmen/index.html
http://www.sjsu.edu/admissions/impaction/impactionresultstransfer/index.html