| 1,6 → 1,6 |
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| |
| Implementation detail differences Daniel Marschall |
| ================================= 02 January 2018 |
| ================================= 03 January 2018 |
| |
| FilterFoundry tries to be as compatible with FilterFactory as possible. |
| However, results are usually not 100% equal, because functions like |
| 94,3 → 94,36 |
|---|
| In Filter Factory, the argument i must be between 0 and 32767, inclusively. |
| If the argument is not within this range, the operation "and 0x7FFF" will be applied to it |
| to extract the low 15 bits. |
| |
| |
| Evaluation of conditional branches |
| ---------------------------------- |
| |
| Filter Factory: |
| Each branch inside a if-then-else expression will be evaluated. |
| This means that following filter would generate a green canvas: (Testcase conditional_eval_1.afs) |
| R : 1==0 ? put(255,0) : 0 |
| G : get(0) |
| B : 0 |
| A : 255 |
| Also, all arguments of an boolean expression will be fully evaluated. |
| So, this will also generate a green canvas: (Testcase conditional_eval_2.afs) |
| R : 1==0 && put(255,0) ? 0: 0 |
| G : get(0) |
| B : 0 |
| A : 255 |
| |
| |
| Filter Foundry: |
| Only the branches which will be chosen due to the conditional expression will be evaluated. |
| This means that following filter would generate a black canvas: (Testcase conditional_eval_1.afs) |
| R : 1==0 ? put(255,0) : 0 |
| G : get(0) |
| B : 0 |
| A : 255 |
| In boolean expressions, the evaluation will be aborted if the result is already determined. |
| So, this will also generate a black canvas: (Testcase conditional_eval_2.afs) |
| R : 1==0 && put(255,0) ? 0: 0 |
| G : get(0) |
| B : 0 |
| A : 255 |