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branchless sprite blit and zbuffer updates

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asrael 2025-12-03 17:42:42 -06:00
parent 349fa8bc81
commit a33d4c0068
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GPG key ID: 2786557804DFAE24
2 changed files with 137 additions and 41 deletions
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58
src/pxl8_blit.c
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@ -9,10 +9,29 @@ void pxl8_blit_hicolor(u16* fb, u32 fb_width, const u16* sprite, u32 atlas_width
u16* dest_row = dest_base + row * fb_width;
const u16* src_row = src_base + row * atlas_width;
for (u32 col = 0; col < w; col++) {
if (src_row[col] != 0) {
dest_row[col] = src_row[col];
u32 col = 0;
u32 count2 = w / 2;
for (u32 i = 0; i < count2; i++) {
u32 pixels = ((const u32*)src_row)[i];
if (pixels == 0) {
col += 2;
continue;
}
u16 s0 = (u16)(pixels);
u16 s1 = (u16)(pixels >> 16);
u16 d0 = dest_row[col];
u16 d1 = dest_row[col + 1];
u16 m0 = (u16)(-(s0 != 0));
u16 m1 = (u16)(-(s1 != 0));
dest_row[col] = (s0 & m0) | (d0 & ~m0);
dest_row[col + 1] = (s1 & m1) | (d1 & ~m1);
col += 2;
}
if (w & 1) {
u16 s = src_row[col];
u16 d = dest_row[col];
u16 m = (u16)(-(s != 0));
dest_row[col] = (s & m) | (d & ~m);
}
}
}
@ -26,10 +45,37 @@ void pxl8_blit_indexed(u8* fb, u32 fb_width, const u8* sprite, u32 atlas_width,
u8* dest_row = dest_base + row * fb_width;
const u8* src_row = src_base + row * atlas_width;
for (u32 col = 0; col < w; col++) {
if (src_row[col] != 0) {
dest_row[col] = src_row[col];
u32 col = 0;
u32 count4 = w / 4;
for (u32 i = 0; i < count4; i++) {
u32 pixels = ((const u32*)src_row)[i];
if (pixels == 0) {
col += 4;
continue;
}
u8 s0 = (u8)(pixels);
u8 s1 = (u8)(pixels >> 8);
u8 s2 = (u8)(pixels >> 16);
u8 s3 = (u8)(pixels >> 24);
u8 d0 = dest_row[col];
u8 d1 = dest_row[col + 1];
u8 d2 = dest_row[col + 2];
u8 d3 = dest_row[col + 3];
u8 m0 = (u8)(-(s0 != 0));
u8 m1 = (u8)(-(s1 != 0));
u8 m2 = (u8)(-(s2 != 0));
u8 m3 = (u8)(-(s3 != 0));
dest_row[col] = (s0 & m0) | (d0 & ~m0);
dest_row[col + 1] = (s1 & m1) | (d1 & ~m1);
dest_row[col + 2] = (s2 & m2) | (d2 & ~m2);
dest_row[col + 3] = (s3 & m3) | (d3 & ~m3);
col += 4;
}
for (; col < w; col++) {
u8 s = src_row[col];
u8 d = dest_row[col];
u8 m = (u8)(-(s != 0));
dest_row[col] = (s & m) | (d & ~m);
}
}
}