This function greatly simplifies the use of effects by making it so you
can call this function in a simple loop. This reduces boilerplate and
makes drawing with effects much easier. The gs_effect_loop function
will now automatically handle all the functions required to do drawing.
---------------------
Before:
gs_technique_t *technique = gs_effect_get_technique("technique");
size_t passes = gs_technique_begin(technique);
for (size_t pass = 0; pass < passes; pass++) {
gs_technique_begin_pass(technique, pass);
[draw]
gs_technique_end_pass(technique);
}
gs_technique_end(technique);
---------------------
After:
while (gs_effect_loop(effect, "technique")) {
[draw]
}
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