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Different animation and fixed top 3 scanlines

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This commit is contained in:
cellos51
2025-08-09 14:58:21 -04:00
parent 521b373bd2
commit 1ef0ce212b
1 changed files with 19 additions and 7 deletions
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source/affine_background.c
+19 -7
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@@ -18,14 +18,26 @@ void affine_background_init()
void affine_background_hblank()
{
const s32 timer_s32 = timer << 8;
const s32 vcount_s32 = REG_VCOUNT << 8;
const s16 vcount_s16 = REG_VCOUNT;
vu16 vcount = REG_VCOUNT;
asx.scr_y = vcount_s16 - 128; // 128 on x and y is an offset used to center the rotation
asx.scr_x = 128;
asx.tex_x = lu_sin(timer_s32 + vcount_s32) + timer / 8;
asx.alpha = (vcount_s32 + timer_s32) / 8;
// This fixes a visual issue where the top 3 pixels of the scanline are out of sync
if (vcount >= 160)
{
vcount -= 228;
}
const s32 timer_s32 = timer << 8;
const s32 vcount_s32 = vcount << 8;
const s16 vcount_s16 = vcount;
const s32 vcount_sine = lu_sin(vcount_s32 + timer_s32 / 16); // dividing the timer by 16 to make the animation slower
asx.scr_x = 128; // 128 on x and y is an offset used to center the rotation
asx.scr_y = vcount_s16 - 128; // scr_y must equal vcount otherwise the background will have no vertical difference
asx.tex_x = vcount_sine;
asx.tex_y = vcount_sine / 64;
asx.sx = vcount_sine / 32;
asx.sy = vcount_sine / 16;
asx.alpha = (vcount_s32 + timer_s32) / 16;
bg_rotscale_ex(&bgaff, &asx);
REG_BG_AFFINE[2] = bgaff;