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ppu_aarch64: initial version of ppu_redraw using Neon

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Sigrid Solveig Haflínudóttir 2021-12-26 07:32:35 +01:00
parent 380b9575e9
commit 6338f8d9a2
1 changed files with 28 additions and 0 deletions
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28
src/devices/ppu_aarch64.c Normal file
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#include <arm_neon.h>
#include "ppu.h"
void
ppu_redraw(Ppu *p, Uint32 *screen)
{
/* FIXME(sigrid): do this better */
Uint32 *rgba = __builtin_assume_aligned(screen, 16);
Uint8 *fg = __builtin_assume_aligned(p->fg.pixels, 16);
Uint8 *bg = __builtin_assume_aligned(p->bg.pixels, 16);
Uint8 *palette = __builtin_assume_aligned((Uint8*)p->palette, 16);
uint8x16x4_t pal = vld4q_u8(palette); enum { R, G, B, A };
int i;
for(i = 0; i < p->width * p->height; i += 16, fg += 16, bg += 16, rgba += 16) {
uint8x16_t fg8 = vld1q_u8(fg);
uint8x16_t bg8 = vld1q_u8(bg);
uint8x16_t bgmask = vceqzq_u8(fg8);
uint8x16_t px8 = vorrq_u8(vandq_u8(bg8, bgmask), vandq_u8(fg8, vceqzq_u8(bgmask)));
uint8x16x4_t px = {
vqtbl1q_u8(pal.val[R], px8),
vqtbl1q_u8(pal.val[G], px8),
vqtbl1q_u8(pal.val[B], px8),
vqtbl1q_u8(pal.val[A], px8),
};
vst4q_u8((uint8_t*)rgba, px);
}
}