make all shaders output vec4, not vec3 #1860
| Job | Run time | 
|---|---|
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| 13m 39s | |
| 15m 28s | |
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| 11m 52s | |
| 11m 46s | |
| 18m 57s | |
| 15m 16s | |
| 10m 4s | |
| 12m 40s | |
| 15m 46s | |
| 14m 44s | |
| 15m 26s | |
| 14m 51s | |
| 18m 19s | |
| 14m 15s | |
| 11m 36s | |
| 14m 13s | |
| 15m 57s | |
| 14m 58s | |
| 18m 21s | |
| 15m 38s | |
| 13m 54s | |
| 7m 2s | |
| 22m 15s | |
| 11m 11s | |
| 12m 15s | |
| 10m 5s | |
| 15m 19s | |
| 28m 16s | |
| 9h 13m 20s |