Sprite drawing crash

[Lion-Lawliet]

I replaced the display_sprites routine to draw four sprites on the screen, three are static and one moves around based on the Hw32xGetTicks value. However, strangely in the current version, the code crashes whenever the sprite crosses the screen boundaries, either horizontally or vertically.

Using Gens KMod, the horizontal crash seems to happen on address $06000B5C (it also causes the emulator to CTD) and the vertical crash seems to happen on address $06000BCC. Using a decompiler, I figured out that the issue seems to lie on the PIX_LOOP routines, the counter seems to underflow.

Thank you for the attention!

[viciious]

I don't think I'll be able to help you without seeing the actual code

[Lion-Lawliet]

My bad, friend! Just one thing to add, I thought this crash was happening due to my modifications but I can replicate this on a fresh/clean source by replacing display_sprites with this:

void display_sprites(int l, void *p)
{
    int start = Hw32xGetTicks();

    draw_setScissor(0, 0, 320, 224);

    if (sprmode >= 0)
    {
        int mode = DRAWSPR_OVERWRITE|DRAWSPR_MULTICORE;
        if (sprmode <= 3)
            mode |= sprmode | DRAWSPR_PRECISE;
        else
            mode |= (sprmode - 4);
                draw_sprite(start, 0 + 16, 32, 32, 64, test32x32_trans_smileData, DRAWSPR_OVERWRITE | mode);
	}
}