create_trans_table(3alleg4)

💖 create_trans_table — the translucency table glow-up ✨

okay bestie, so this one lives in the Allegro game programming library, and it's in manual section 3alleg4 if you were wondering where to find it 🫶

🌸 NAME 🌸

create_trans_table — fills a color mapping table for translucency effects, brought to you by the Allegro game programming library 💅

✨ SYNOPSIS ✨

#include <allegro.h>

void create_trans_table(COLOR_MAP *table, const PALETTE pal, int r, g, b,
                        void (*callback)(int pos));

🦋 DESCRIPTION 🦋

So basically? This function fills the color mapping table you hand it (table) with all the lookup data you need to do translucency effects using the palette you specify (pal). ✨

When you combine two colors, c1 and c2, using this table, the result is a color that lands somewhere in between the two. Not exactly one, not exactly the other — a lil blend, a lil moment 🎀

Now the r, g, and b params? They set the solidity of each color component, and the range goes from 0 (totally transparent, see-through, ghost mode 👻) all the way up to 255 (totally solid, no cap 💪). And if you want that classic 50% solidity, you just pass 128. That's the vibe.

💀 Heads up bestie: this function treats source color #0 as a special case — it leaves the destination unchanged whenever a zero source pixel shows up, so that masked sprites will draw correctly. Important, don't skip it.

Also, this function will lowkey take advantage of the global rgb_map variable to speed up color conversions 🔥 iconic behavior honestly.

And if the callback function is not NULL, it gets called 256 times during the calculation, which is your moment to display a progress indicator. main character progress bar energy 👑

Example time, periodt:

COLOR_MAP trans_table;
...
/* Build a color lookup table for translucent drawing. */
create_trans_table(&trans_table, pal, 128, 128, 128, NULL);

👑 SEE ALSO 👑

• color_map(3alleg4)
• create_light_table(3alleg4)
• create_color_table(3alleg4)
• create_blender_table(3alleg4)
• draw_trans_sprite(3alleg4)
• draw_lit_sprite(3alleg4)
• draw_gouraud_sprite(3alleg4)
• rgb_map(3alleg4)
• ex3d(3alleg4)
• extrans(3alleg4)

and that's the whole page, bestie 🧚💜 this was Allegro version 4.4.3, create_trans_table(3alleg4) — go build something translucent and gorgeous, you ate fr fr 🍓🌈⭐