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+--- Thread: Adding more blending modes (/showthread.php?tid=1723)
Adding more blending modes - System64 - 05-09-2022
Hello. I want to add more blending modes into Tilengine, such as logical OR, logical AND, and so on. I know I can define a custom blending function, but I want to implement it right into the library. How can I achieve that please?
Thanks for your answer.
RE: Adding more blending modes - megamarc - 05-09-2022
Hi!
Built-in blending tables are created in file Tables.c, in CreateBlendTables() function:
https://github.com/megamarc/Tilengine/blob/effe3a778de747469f8c83b6452af66e5cad30a8/src/Tables.c#L20
To add new modes, just expand the public enumeration TLN_Blend here:
https://github.com/megamarc/Tilengine/blob/effe3a778de747469f8c83b6452af66e5cad30a8/include/Tilengine.h#L83
And add the corresponding blend formula in the aforementioned CreateBlendTables() with the desired effect.
For example formula for hypothetical logical AND should be:
Code:
_blend_tables[BLEND_AND][offset] = (a & b);Parameters a and b are brightness levels between 0 and 255
RE: Adding more blending modes - System64 - 05-09-2022
(05-09-2022, 08:55 PM)megamarc Wrote: Hi!
Built-in blending tables are created in file Tables.c, in CreateBlendTables() function:
https://github.com/megamarc/Tilengine/blob/effe3a778de747469f8c83b6452af66e5cad30a8/src/Tables.c#L20
To add new modes, just expand the public enumeration TLN_Blend here:
https://github.com/megamarc/Tilengine/blob/effe3a778de747469f8c83b6452af66e5cad30a8/include/Tilengine.h#L83
And add the corresponding blend formula in the aforementioned CreateBlendTables() with the desired effect.
For example formula for hypothetical logical AND should be:
Code:_blend_tables[BLEND_AND][offset] = (a & b);
Parameters a and b are brightness levels between 0 and 255
Ah thanks! I will try this!
RE: Adding more blending modes - System64 - 05-10-2022
I added new blend modes in my fork. Thanks for your help!