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loongarch: add BlitRGBtoRGBPixelAlphaLSX opt

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(cherry picked from commit 686c18026b)
This commit is contained in:
yuanhecai
2025-10-28 11:09:09 +08:00
committed by Sam Lantinga
parent e458305c43
commit a07b00ccb0
1 changed files with 67 additions and 2 deletions
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69
src/video/SDL_blit_A.c
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@@ -412,6 +412,66 @@ static void BlitRGBtoRGBPixelAlphaMMX(SDL_BlitInfo *info)
#endif /* __MMX__ */
#if defined(__loongarch_sx)
static void
BlitRGBtoRGBPixelAlphaLSX(SDL_BlitInfo * info)
{
int width = info->dst_w;
int height = info->dst_h;
Uint32 *srcp = (Uint32 *) info->src;
int srcskip = info->src_skip >> 2;
Uint32 *dstp = (Uint32 *) info->dst;
int dstskip = info->dst_skip >> 2;
SDL_PixelFormat *sf = info->src_fmt;
Uint32 amask = sf->Amask;
Uint32 ashift = sf->Ashift;
Uint64 multmask, multmask2;
__m128i src1, src2, src3, dst1, alpha, alpha2;
multmask = 0x00FF;
multmask <<= (ashift * 2);
multmask2 = 0x00FF00FF00FF00FFULL;
while (height--) {
/* *INDENT-OFF* */
DUFFS_LOOP4({
Uint32 alpha1 = *srcp & amask;
if (alpha1 == 0) {
/* do nothing */
} else if (alpha1 == amask) {
*dstp = *srcp;
} else {
src1 = __lsx_vreplgr2vr_w(*srcp);
src1 = __lsx_vinsgr2vr_w(src1, *dstp, 1);
src2 = __lsx_vsllwil_hu_bu(src1, 0);
alpha = __lsx_vreplgr2vr_w(alpha1);
alpha = __lsx_vsrl_d(alpha, __lsx_vreplgr2vr_d(ashift));
alpha = __lsx_vilvl_h(alpha, alpha);
alpha2 = __lsx_vilvl_w(alpha, alpha);
alpha = __lsx_vor_v(alpha2, __lsx_vreplgr2vr_d(multmask));
alpha2 = __lsx_vxor_v(alpha2, __lsx_vreplgr2vr_d(multmask2));
src3 = __lsx_vilvl_d(alpha2, alpha);
src1 = __lsx_vmul_h(src2, src3);
src1 = __lsx_vsrli_h(src1, 8);
src2 = __lsx_vilvh_d(src1, src1);
src1 = __lsx_vadd_h(src1, src2);
dst1 = __lsx_vssrlni_bu_h(src1, src1, 0);
__lsx_vstelm_w(dst1, dstp, 0, 0);
}
++srcp;
++dstp;
}, width);
/* *INDENT-ON* */
srcp += srcskip;
dstp += dstskip;
}
}
#endif /* __loongarch_sx */
#ifdef SDL_ARM_SIMD_BLITTERS
void BlitARGBto565PixelAlphaARMSIMDAsm(int32_t w, int32_t h, uint16_t *dst, int32_t dst_stride, uint32_t *src, int32_t src_stride);
@@ -1456,7 +1516,7 @@ SDL_BlitFunc SDL_CalculateBlitA(SDL_Surface *surface)
case 4:
if (sf->Rmask == df->Rmask && sf->Gmask == df->Gmask && sf->Bmask == df->Bmask && sf->BytesPerPixel == 4) {
#if defined(__MMX__) || defined(__3dNOW__)
#if defined(__MMX__) || defined(__3dNOW__) || defined(__loongarch_sx)
if (sf->Rshift % 8 == 0 && sf->Gshift % 8 == 0 && sf->Bshift % 8 == 0 && sf->Ashift % 8 == 0 && sf->Aloss == 0) {
#ifdef __3dNOW__
if (SDL_Has3DNow()) {
@@ -1467,9 +1527,14 @@ SDL_BlitFunc SDL_CalculateBlitA(SDL_Surface *surface)
if (SDL_HasMMX()) {
return BlitRGBtoRGBPixelAlphaMMX;
}
#endif
#ifdef __loongarch_sx
if (SDL_HasLSX()) {
return BlitRGBtoRGBPixelAlphaLSX;
}
#endif
}
#endif /* __MMX__ || __3dNOW__ */
#endif /* __MMX__ || __3dNOW__ || __loongarch_sx*/
if (sf->Amask == 0xff000000) {
#ifdef SDL_ARM_NEON_BLITTERS
if (SDL_HasNEON()) {