Adds the vertices data into the batch and flushes if full.
Assumes 3 vertices in the following arrangement:
0
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1-----2
| name | type | description |
|---|---|---|
| x1 | number |
The bottom-left x position. |
| y1 | number |
The bottom-left y position. |
| x2 | number |
The bottom-right x position. |
| y2 | number |
The bottom-right y position. |
| x3 | number |
The top-right x position. |
| y3 | number |
The top-right y position. |
| tintTL | number |
The top-left tint color value. |
| tintTR | number |
The top-right tint color value. |
| tintBL | number |
The bottom-left tint color value. |
true if this method caused the batch to flush, otherwise false.