al_draw_indexed_buffer(3alleg5)

al_draw_indexed_buffer 💅✨

okay bestie, welcome to the Allegro 5 API — this one's from the allegro_primitives corner of the world, and it's lowkey iconic once you get it. let's go 🫶

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✨ SYNOPSIS ✨

#include <allegro5/allegro_primitives.h>

int al_draw_indexed_buffer(ALLEGRO_VERTEX_BUFFER* vertex_buffer,
   ALLEGRO_BITMAP* texture, ALLEGRO_INDEX_BUFFER* index_buffer,
   int start, int end, int type)

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🌸 DESCRIPTION 🌸

So what this does is it draws a subset of the vertex buffer you hand it — not the whole thing, just a lil slice. And the way it knows which vertices to actually use? An index buffer, bestie. That's the whole trick. 👑

Both buffers must not be locked. Not negotiable, fr fr.

And here's the tea: if you wanna draw onto memory bitmaps or use memory bitmap textures, then both buffers have to support reading. Which means they gotta be created with ALLEGRO_PRIM_BUFFER_READWRITE. No exceptions, periodt. 💀

🎀 Parameters 🎀

• vertex_buffer — the vertex buffer you're drawing. your main character. ✨
• texture — the texture to use. pass NULL if you only want color-shaded primitives (i.e. no texture at all, just vibes). 🌈
• index_buffer — the index buffer to use. this is the one picking the vertices. 💅
• start — the start index of the subset of the index buffer you're drawing. where the slay begins. 🦋
• end — one past the last index of the subset of the index buffer to draw. yes, one past — classic C-style half-open thing, don't come for me. 🙈
• type — a member of the ALLEGRO_PRIM_TYPE(3alleg5) enumeration, specifying what kind of primitive to draw. ⭐

⚠️ heads up babes: ALLEGRO_PRIM_LINE_LOOP and ALLEGRO_PRIM_POINT_LIST are not supported. not happening. pick something else. 💀

Returns: Number of primitives drawn 🔥

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💖 SINCE 💖

5.1.8

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🧚 SEE ALSO 🧚

• ALLEGRO_VERTEX_BUFFER(3alleg5)
• ALLEGRO_INDEX_BUFFER(3alleg5)
• ALLEGRO_PRIM_TYPE(3alleg5)

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and that's the whole page, bestie — straight from the Allegro reference manual, covering al_draw_indexed_buffer(3alleg5). go draw something gorgeous with it. mwah 💋🌸💜