From a07b00ccb05434f9bcea028eeab331144c87edde Mon Sep 17 00:00:00 2001
From: yuanhecai <[EMAIL REDACTED]>
Date: Tue, 28 Oct 2025 11:09:09 +0800
Subject: [PATCH] loongarch: add BlitRGBtoRGBPixelAlphaLSX opt
(cherry picked from commit 686c18026bfa746d2595c4088bfc47ac2f627d6f)
---
src/video/SDL_blit_A.c | 69 ++++++++++++++++++++++++++++++++++++++++--
1 file changed, 67 insertions(+), 2 deletions(-)
diff --git a/src/video/SDL_blit_A.c b/src/video/SDL_blit_A.c
index 9f1716c0db810..d135a83839f6e 100644
--- a/src/video/SDL_blit_A.c
+++ b/src/video/SDL_blit_A.c
@@ -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()) {